Version Packages (#2984 )

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Update OpenAPI operation path design (#2972 )
2026-09-12 05:48:57 +00:00 · 2025-03-17 11:06:18 +01:00 · 2025-03-17 10:18:24 +01:00 · 2025-03-17 09:00:58 +01:00 · 2025-03-14 18:24:25 +01:00 · 2025-03-14 18:01:38 +01:00
570 changed files with 88461 additions and 12928 deletions
@@ -12,7 +12,7 @@ runs:

        # Cache browser binaries, cache key is based on Playwright version and OS
        - name: 🧰 Cache Playwright browser binaries
-          uses: actions/cache@v3
+          uses: actions/cache@v4
          id: playwright-cache
          with:
              path: '~/.cache/ms-playwright'
@@ -0,0 +1,71 @@
+name: 'Deploy cloudflare'
+description: 'Deploy GitBook to Cloudflare'
+inputs:
+  opItem:
+    description: '1Password item to load secrets from'
+    required: true
+  opServiceAccount:
+    description: '1Password service account token'
+    required: true
+  apiToken:
+    description: 'Cloudflare API token'
+    required: true
+  accountId:
+    description: 'Cloudflare account ID'
+    required: true
+  environment:
+    description: 'Cloudflare environment to deploy to (staging, production, preview)'
+    required: true
+  deploy:
+    description: 'Deploy as main version for all traffic instead of uploading versions'
+    required: true
+outputs:
+    deployment-url: 
+      description: "Deployment URL"
+      value: ${{ steps.deploy.outputs.deployment-url }}
+runs:
+    using: 'composite'
+    steps:
+        - name: Setup Bun
+          uses: ./.github/composite/setup-bun
+        - name: Install dependencies
+          run: bun install --frozen-lockfile
+          shell: bash
+          env:
+              PUPPETEER_SKIP_DOWNLOAD: 1
+        - name: Load secret
+          uses: 1password/load-secrets-action@v2
+          env:
+            OP_SERVICE_ACCOUNT_TOKEN: ${{ inputs.opServiceAccount }}
+            GITBOOK_URL: ${{ inputs.opItem }}/GITBOOK_URL
+            GITBOOK_ICONS_URL: ${{ inputs.opItem }}/GITBOOK_ICONS_URL
+            GITBOOK_ICONS_TOKEN: ${{ inputs.opItem }}/GITBOOK_ICONS_TOKEN
+            NEXT_SERVER_ACTIONS_ENCRYPTION_KEY: ${{ inputs.opItem }}/NEXT_SERVER_ACTIONS_ENCRYPTION_KEY
+            GITBOOK_SECRET: ${{ inputs.opItem }}/GITBOOK_SECRET
+            GITBOOK_APP_URL: ${{ inputs.opItem }}/GITBOOK_APP_URL
+            GITBOOK_API_URL: ${{ inputs.opItem }}/GITBOOK_API_URL
+            GITBOOK_API_PUBLIC_URL: ${{ inputs.opItem }}/GITBOOK_API_PUBLIC_URL
+            GITBOOK_API_TOKEN: ${{ inputs.opItem }}/GITBOOK_API_TOKEN
+            GITBOOK_INTEGRATIONS_HOST: ${{ inputs.opItem }}/GITBOOK_INTEGRATIONS_HOST
+            GITBOOK_IMAGE_RESIZE_SIGNING_KEY: ${{ inputs.opItem }}/GITBOOK_IMAGE_RESIZE_SIGNING_KEY
+            GITBOOK_IMAGE_RESIZE_URL: ${{ inputs.opItem }}/GITBOOK_IMAGE_RESIZE_URL
+            GITBOOK_ASSETS_PREFIX: ${{ inputs.opItem }}/GITBOOK_ASSETS_PREFIX
+        - name: Build worker
+          run: bun run turbo build:v2:cloudflare
+          shell: bash
+        - id: deploy
+          name: Deploy to Cloudflare
+          uses: cloudflare/wrangler-action@v3.14.0
+          with:
+              apiToken: ${{ inputs.apiToken }}
+              accountId: ${{ inputs.accountId }}
+              workingDirectory: ./
+              wranglerVersion: '3.112.0'
+              environment: ${{ inputs.environment }}
+              command: ${{ fromJSON(inputs.deploy) == true && 'deploy' || 'versions upload' }} --config ./packages/gitbook-v2/wrangler.toml
+        - name: Outputs
+          shell: bash
+          env:
+            DEPLOYMENT_URL: ${{ steps.deploy.outputs.deployment-url }}
+          run: |
+              echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
@@ -0,0 +1,76 @@
+name: 'Deploy vercel'
+description: 'Deploy GitBook to Vercel'
+inputs:
+  vercelOrg:
+    description: 'Vercel organization'
+    required: true
+  vercelProject:
+    description: 'Vercel project'
+    required: true
+  vercelToken:
+    description: 'Vercel token'
+    required: true
+  opItem:
+    description: '1Password item to load secrets from'
+    required: true
+  opServiceAccount:
+    description: '1Password service account token'
+    required: true
+  environment:
+    description: 'Environment to deploy to'
+    required: true
+outputs:
+    deployment-url: 
+      description: "Deployment URL"
+      value: ${{ steps.deploy.outputs.deployment-url }}
+runs:
+    using: 'composite'
+    steps:
+        - name: Setup Bun
+          uses: ./.github/composite/setup-bun
+        - name: Install dependencies
+          run: bun install --frozen-lockfile
+          shell: bash
+          env:
+              PUPPETEER_SKIP_DOWNLOAD: 1
+        - name: Pull Vercel Environment Information
+          run: bun run vercel pull --yes --environment=${{ inputs.environment }} --token=${{ inputs.vercelToken }}
+          shell: bash
+          env:
+            VERCEL_ORG_ID: ${{ inputs.vercelOrg }}
+            VERCEL_PROJECT_ID: ${{ inputs.vercelProject }}
+        - name: Load secret
+          uses: 1password/load-secrets-action@v2
+          env:
+            OP_SERVICE_ACCOUNT_TOKEN: ${{ inputs.opServiceAccount }}
+            GITBOOK_URL: ${{ inputs.opItem }}/GITBOOK_URL
+            GITBOOK_ICONS_URL: ${{ inputs.opItem }}/GITBOOK_ICONS_URL
+            GITBOOK_ICONS_TOKEN: ${{ inputs.opItem }}/GITBOOK_ICONS_TOKEN
+            GITBOOK_SECRET: ${{ inputs.opItem }}/GITBOOK_SECRET
+            GITBOOK_APP_URL: ${{ inputs.opItem }}/GITBOOK_APP_URL
+            GITBOOK_API_URL: ${{ inputs.opItem }}/GITBOOK_API_URL
+            GITBOOK_API_PUBLIC_URL: ${{ inputs.opItem }}/GITBOOK_API_PUBLIC_URL
+            GITBOOK_API_TOKEN: ${{ inputs.opItem }}/GITBOOK_API_TOKEN
+            GITBOOK_INTEGRATIONS_HOST: ${{ inputs.opItem }}/GITBOOK_INTEGRATIONS_HOST
+            GITBOOK_IMAGE_RESIZE_SIGNING_KEY: ${{ inputs.opItem }}/GITBOOK_IMAGE_RESIZE_SIGNING_KEY
+            GITBOOK_IMAGE_RESIZE_URL: ${{ inputs.opItem }}/GITBOOK_IMAGE_RESIZE_URL
+            GITBOOK_ASSETS_PREFIX: ${{ inputs.opItem }}/GITBOOK_ASSETS_PREFIX
+        - name: Build Project Artifacts
+          run: bun run vercel build --target=${{ inputs.environment }} --token=${{ inputs.vercelToken }}
+          shell: bash
+          env:
+            VERCEL_ORG_ID: ${{ inputs.vercelOrg }}
+            VERCEL_PROJECT_ID: ${{ inputs.vercelProject }}
+        - name: Deploy Project Artifacts to Vercel
+          id: deploy
+          shell: bash
+          run: |
+              DEPLOYMENT_URL=$(bun run vercel deploy --prebuilt --target=${{ inputs.environment }} --token=${{ inputs.vercelToken }})
+              echo "deployment-url=$DEPLOYMENT_URL" >> "$GITHUB_OUTPUT"
+          env:
+            VERCEL_ORG_ID: ${{ inputs.vercelOrg }}
+            VERCEL_PROJECT_ID: ${{ inputs.vercelProject }}
+        - name: Outputs
+          shell: bash
+          run: |
+              echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
@@ -0,0 +1,18 @@
+name: 'Setup Bun'
+description: 'Install Bun and cache dependencies'
+runs:
+    using: 'composite'
+    steps:
+        # We cache dependencies even if Bun is fast to avoid downloading fontawesome too many times
+        # and impacting bandwidth there.
+        - name: Cache bun
+          uses: actions/cache@v4
+          with:
+              path: ~/.bun/install/cache
+              key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lockb') }}-${{ hashFiles('**/bun.lock') }}
+              restore-keys: |
+                  ${{ runner.os }}-bun-
+        - name: Setup bun
+          uses: oven-sh/setup-bun@v2
+          with:
+              bun-version-file: 'package.json'
@@ -5,192 +5,31 @@ on:
        branches:
            - main
 env:
-    NPMRC_FONT_AWESOME_TOKEN: ${{ secrets.NPMRC_FONT_AWESOME_TOKEN }}
+    NPM_TOKEN_READONLY: ${{ secrets.NPM_TOKEN_READONLY }}
 jobs:
-    deploy:
-        name: Deploy to Cloudflare Pages
-        runs-on: ubuntu-latest
-        permissions:
-            contents: read
-            deployments: write
-            issues: write
-            pull-requests: write
-            checks: write
-            statuses: write
-        outputs:
-            deployment_url: ${{ steps.deploy.outputs.url }}
-        steps:
-            - name: Checkout
-              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
-            - name: Install dependencies
-              run: bun install --frozen-lockfile
-              env:
-                  PUPPETEER_SKIP_DOWNLOAD: 1
-            - name: Cache Next.js build
-              uses: actions/cache@v3
-              with:
-                  path: |
-                      ${{ github.workspace }}/.next/cache
-                  # Generate a new cache whenever packages or source files change.
-                  key: ${{ runner.os }}-nextjs-${{ hashFiles('**/bun.lockb') }}-${{ hashFiles('**/*.js', '**/*.jsx', '**/*.ts', '**/*.tsx') }}
-                  # If source files changed but packages didn't, rebuild from a prior cache.
-                  restore-keys: |
-                      ${{ runner.os }}-nextjs-${{ hashFiles('**/bun.lockb') }}-
-            - name: Sets env vars for production
-              run: |
-                  echo "SENTRY_ENVIRONMENT=production" >> $GITHUB_ENV
-                  echo "GITBOOK_ASSETS_PREFIX=https://static.gitbook.com" >> $GITHUB_ENV
-              if: startsWith(github.ref, 'refs/heads/main')
-            - name: Sets env vars for preview
-              run: |
-                  echo "SENTRY_ENVIRONMENT=preview" >> $GITHUB_ENV
-              if: 1 && !startsWith(github.ref, 'refs/heads/main')
-            - name: Build Next.js with next-on-pages
-              run: bun run build:cloudflare
-              env:
-                  SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
-                  SENTRY_ORG: ${{ vars.SENTRY_ORG }}
-                  SENTRY_PROJECT: ${{ vars.SENTRY_PROJECT }}
-                  SENTRY_DSN: ${{ vars.SENTRY_DSN }}
-            - id: deploy
-              name: Deploy to Cloudflare
-              uses: cloudflare/wrangler-action@v3
-              with:
-                  apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
-                  accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
-                  workingDirectory: ./
-                  wranglerVersion: '3.82.0'
-                  command: pages deploy ./packages/gitbook/.vercel/output/static --project-name=${{ vars.CLOUDFLARE_PROJECT_NAME }} --branch=${{ github.ref == 'refs/heads/main' && 'main' || format('pr{0}', github.event.pull_request.number) }}
-            - name: Outputs
-              run: |
-                  echo "URL: ${{ steps.deploy.outputs.url }}"
-                  echo "Alias URL: ${{ steps.deploy.outputs.deployment-alias-url }}"
-            - name: Archive build output
-              uses: actions/upload-artifact@v4
-              with:
-                  name: build-output
-                  path: .vercel/
-            # Until https://github.com/cloudflare/wrangler-action/issues/301 is done
-            - name: Update Deployment Status to Success
-              env:
-                  DEPLOYMENT_URL: ${{ steps.deploy.outputs.url }}
-              run: |
-                  curl -X POST \
-                    -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
-                    -H "Accept: application/vnd.github.v3+json" \
-                    -d '{"state": "success", "target_url": "${{ steps.deploy.outputs.url }}", "description": "Deployed Preview URL for commit", "context": "cloudflare/preview"}' \
-                    https://api.github.com/repos/${{ github.repository }}/statuses/${{ github.sha }}
-
-            - name: Find GitHub Comment
-              uses: peter-evans/find-comment@v3
-              id: fc
-              if: 1 && !startsWith(github.ref, 'refs/heads/main')
-              with:
-                  issue-number: ${{ github.event.pull_request.number }}
-                  comment-author: 'github-actions[bot]'
-                  body-includes: GitBook Preview
-
-            - name: Create or update GitHub comment
-              uses: peter-evans/create-or-update-comment@v4
-              if: 1 && !startsWith(github.ref, 'refs/heads/main')
-              with:
-                  comment-id: ${{ steps.fc.outputs.comment-id }}
-                  issue-number: ${{ github.event.pull_request.number }}
-                  body: |
-                      **GitBook Preview**
-                      Latest commit: [${{ steps.deploy.outputs.url }}](${{ steps.deploy.outputs.url }})
-                      PR: [${{ steps.deploy.outputs.alias }}](${{ steps.deploy.outputs.alias }})
-                  edit-mode: replace
-    visual-testing:
-        runs-on: ubuntu-latest
-        name: Visual Testing
-        needs: deploy
-        steps:
-            - name: Checkout
-              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
-            - name: Install dependencies
-              run: bun install --frozen-lockfile
-            - name: Setup Playwright
-              uses: ./.github/actions/setup-playwright
-            - name: Run Playwright tests
-              run: bun e2e
-              env:
-                  BASE_URL: ${{needs.deploy.outputs.deployment_url}}
-                  ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
-            - uses: actions/upload-artifact@v4
-              if: ${{ !cancelled() }}
-              with:
-                  name: playwright-test-results
-                  path: packages/gitbook/test-results/
-                  retention-days: 3
-    pagespeed-testing:
-        runs-on: ubuntu-latest
-        name: PageSpeed Testing
-        needs: deploy
-        steps:
-            - name: Checkout
-              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
-            - name: Install dependencies
-              run: bun install --frozen-lockfile
-              env:
-                  PUPPETEER_SKIP_DOWNLOAD: 1
-            - name: Run pagespeed tests
-              run: bun ./packages/gitbook/tests/pagespeed-testing.ts $DEPLOYMENT_URL
-              env:
-                  DEPLOYMENT_URL: ${{needs.deploy.outputs.deployment_url}}
-                  PAGESPEED_API_KEY: ${{ secrets.PAGESPEED_API_KEY }}
    format:
        runs-on: ubuntu-latest
        name: Format
+        timeout-minutes: 6
        steps:
            - name: Checkout
              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
              run: bun install --frozen-lockfile
              env:
                  PUPPETEER_SKIP_DOWNLOAD: 1
            - run: bun format:check
-    lint:
-        runs-on: ubuntu-latest
-        name: Lint
-        steps:
-            - name: Checkout
-              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
-            - name: Install dependencies
-              run: bun install --frozen-lockfile
-              env:
-                  PUPPETEER_SKIP_DOWNLOAD: 1
-            - run: bun lint --no-cache
    test:
        runs-on: ubuntu-latest
        name: Test
+        timeout-minutes: 6
        steps:
            - name: Checkout
              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
              run: bun install --frozen-lockfile
              env:
@@ -200,30 +39,28 @@ jobs:
        # CI to check that the repository builds correctly on a machine without the credentials
        runs-on: ubuntu-latest
        name: Build (Open Source)
+        timeout-minutes: 6
        env:
-            NPMRC_FONT_AWESOME_TOKEN: ''
+            NPM_TOKEN_READONLY: ''
        steps:
            - name: Checkout
              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
-              run: bun install --frozen-lockfile
+              run: bun install
              env:
                  PUPPETEER_SKIP_DOWNLOAD: 1
            - run: bun run build
    typecheck:
        runs-on: ubuntu-latest
        name: Typecheck
+        timeout-minutes: 6
        steps:
            - name: Checkout
              uses: actions/checkout@v4
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
              run: bun install --frozen-lockfile
              env:
@@ -0,0 +1,245 @@
+name: Preview
+on:
+    pull_request:
+    push:
+      branches:
+        - main
+env:
+    NPM_TOKEN_READONLY: ${{ secrets.NPM_TOKEN_READONLY }}
+jobs:
+    deploy-v1-cloudflare:
+        name: Deploy v1 to Cloudflare Pages
+        runs-on: ubuntu-latest
+        environment: 
+          name: ${{ github.ref == 'refs/heads/main' && '1c-production' || '1c-preview' }}
+          url: ${{ steps.deploy.outputs.deployment-url }}
+        permissions:
+            contents: read
+            deployments: write
+            issues: write
+            pull-requests: write
+            checks: write
+            statuses: write
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+            deployment-alias-url: ${{ steps.deploy.outputs.deployment-alias-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
+            - name: Sets env vars for production
+              if: github.ref == 'refs/heads/main'
+              run: |
+                echo "GITBOOK_ASSETS_PREFIX=https://static.gitbook.com" >> $GITHUB_ENV
+            - name: Build Next.js with next-on-pages
+              run: bun run turbo gitbook#build:cloudflare
+              env:
+                  NEXT_SERVER_ACTIONS_ENCRYPTION_KEY: ${{ secrets.NEXT_SERVER_ACTIONS_ENCRYPTION_KEY }}
+            - id: deploy
+              name: Deploy to Cloudflare
+              uses: cloudflare/wrangler-action@v3.14.0
+              with:
+                  apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+                  accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+                  workingDirectory: ./
+                  wranglerVersion: '3.112.0'
+                  command: pages deploy ./packages/gitbook/.vercel/output/static --project-name=${{ vars.CLOUDFLARE_PROJECT_NAME }} --branch=${{ github.ref == 'refs/heads/main' && 'main' || format('pr{0}', github.event.pull_request.number) }}
+            - name: Outputs
+              run: |
+                  echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
+                  echo "Alias URL: ${{ steps.deploy.outputs.deployment-alias-url }}"
+    deploy-v2-vercel:
+        name: Deploy v2 to Vercel (preview)
+        runs-on: ubuntu-latest
+        environment: 
+          name: 2v-preview
+          url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy to Vercel
+              id: deploy
+              uses: ./.github/composite/deploy-vercel
+              with:
+                  environment: preview
+                  vercelOrg: ${{ secrets.VERCEL_ORG_ID }}
+                  vercelProject: ${{ secrets.VERCEL_PROJECT_ID }}
+                  vercelToken: ${{ secrets.VERCEL_TOKEN }}
+                  opItem: op://gitbook-open/2v-preview
+                  opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+    deploy-v2-cloudflare:
+        name: Deploy v2 to Cloudflare Worker (preview)
+        runs-on: ubuntu-latest
+        environment: 
+          name: 2c-preview
+          url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy to Cloudflare
+              id: deploy
+              uses: ./.github/composite/deploy-cloudflare
+              with:
+                  environment: preview
+                  deploy: ${{ github.ref == 'refs/heads/main' }}
+                  apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+                  accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+                  opItem: op://gitbook-open/2c-preview
+                  opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+            - name: Outputs
+              run: |
+                  echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
+    comment-deployments:
+        runs-on: ubuntu-latest
+        name: Comment Deployments (preview)
+        if: always() && !startsWith(github.ref, 'refs/heads/main')
+        needs:
+            - deploy-v1-cloudflare
+            - deploy-v2-vercel
+            - deploy-v2-cloudflare
+        steps:
+            - name: Find GitHub Comment
+              uses: peter-evans/find-comment@v3
+              id: fc
+              with:
+                  issue-number: ${{ github.event.pull_request.number }}
+                  comment-author: 'github-actions[bot]'
+                  body-includes: 'Summary of the deployments'
+
+            - name: Create or update GitHub comment
+              uses: peter-evans/create-or-update-comment@v4
+              with:
+                  comment-id: ${{ steps.fc.outputs.comment-id }}
+                  issue-number: ${{ github.event.pull_request.number }}
+                  body: |
+                      Summary of the deployments:
+
+                      ### Version 1 (production)
+
+                      | Version | URL | Status |
+                      | --- | --- | --- |
+                      | Latest commit | [${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}](${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}) | ${{ needs.deploy-v1-cloudflare.result == 'success' && '✅' || '❌' }} |
+                      | PR | [${{ needs.deploy-v1-cloudflare.outputs.deployment-alias-url }}](${{ needs.deploy-v1-cloudflare.outputs.deployment-alias-url }}) | ${{ needs.deploy-v1-cloudflare.result == 'success' && '✅' || '❌' }} |
+
+                      ### Version 2 (experimental)
+
+                      | Version | URL | Status |
+                      | --- | --- | --- |
+                      | Vercel | [${{ needs.deploy-v2-vercel.outputs.deployment-url }}](${{ needs.deploy-v2-vercel.outputs.deployment-url }}) | ${{ needs.deploy-v2-vercel.result == 'success' && '✅' || '❌' }} |
+                      | Cloudflare | [${{ needs.deploy-v2-cloudflare.outputs.deployment-url }}](${{ needs.deploy-v2-cloudflare.outputs.deployment-url }}) | ${{ needs.deploy-v2-cloudflare.result == 'success' && '✅' || '❌' }} |
+
+                      ### Test content
+
+                      | Site | v1 | v2 |
+                      | --- | --- | --- |
+                      | GitBook | [${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}/docs.gitbook.com](${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}/docs.gitbook.com) | [${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/docs.gitbook.com](${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/docs.gitbook.com) |
+                      | E2E | [${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}/gitbook.gitbook.io/test-gitbook-open](${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}/gitbook.gitbook.io/test-gitbook-open) | [${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/gitbook.gitbook.io/test-gitbook-open](${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/gitbook.gitbook.io/test-gitbook-open) |
+                  edit-mode: replace
+    visual-testing-v1:
+        runs-on: ubuntu-latest
+        name: Visual Testing v1
+        needs: deploy-v1-cloudflare
+        timeout-minutes: 8
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+            - name: Setup Playwright
+              uses: ./.github/actions/setup-playwright
+            - name: Run Playwright tests
+              run: bun e2e
+              env:
+                  BASE_URL: ${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}
+                  ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
+    visual-testing-v2-vercel:
+        runs-on: ubuntu-latest
+        name: Visual Testing v2
+        needs: deploy-v2-vercel
+        timeout-minutes: 10
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+            - name: Setup Playwright
+              uses: ./.github/actions/setup-playwright
+            - name: Run Playwright tests
+              run: bun e2e
+              env:
+                  BASE_URL: ${{ needs.deploy-v2-vercel.outputs.deployment-url }}
+                  SITE_BASE_URL: ${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/
+                  ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
+                  ARGOS_BUILD_NAME: 'v2-vercel'
+    visual-testing-customers-v1:
+        runs-on: ubuntu-latest
+        name: Visual Testing Customers v1
+        needs: deploy-v1-cloudflare
+        timeout-minutes: 6
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+            - name: Setup Playwright
+              uses: ./.github/actions/setup-playwright
+            - name: Run Playwright tests
+              run: bun e2e-customers
+              env:
+                  BASE_URL: ${{ needs.deploy-v1-cloudflare.outputs.deployment-url }}
+                  ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
+                  ARGOS_BUILD_NAME: 'customers-v1'
+    visual-testing-customers-v2:
+        runs-on: ubuntu-latest
+        name: Visual Testing Customers v2
+        needs: deploy-v2-vercel
+        timeout-minutes: 6
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+            - name: Setup Playwright
+              uses: ./.github/actions/setup-playwright
+            - name: Run Playwright tests
+              run: bun e2e-customers
+              env:
+                  BASE_URL: ${{ needs.deploy-v2-vercel.outputs.deployment-url }}
+                  SITE_BASE_URL: ${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/
+                  ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
+                  ARGOS_BUILD_NAME: 'customers-v2'
+    pagespeed-testing-v1:
+        runs-on: ubuntu-latest
+        name: PageSpeed Testing v1
+        needs: deploy-v1-cloudflare
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
+            - name: Install dependencies
+              run: bun install --frozen-lockfile
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
+            - name: Run pagespeed tests
+              run: bun ./packages/gitbook/tests/pagespeed-testing.ts
+              env:
+                  BASE_URL: ${{needs.deploy-v1-cloudflare.outputs.deployment-url}}
+                  PAGESPEED_API_KEY: ${{ secrets.PAGESPEED_API_KEY }}
@@ -0,0 +1,53 @@
+name: Production
+on:
+    push:
+        branches:
+            - main
+env:
+    NPM_TOKEN_READONLY: ${{ secrets.NPM_TOKEN_READONLY }}
+jobs:
+    deploy-v2-vercel:
+        name: Deploy v2 to Vercel (production)
+        runs-on: ubuntu-latest
+        environment: 
+            name: 2v-production
+            url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy staging
+              id: deploy
+              uses: ./.github/composite/deploy-vercel
+              with:
+                environment: production
+                vercelOrg: ${{ secrets.VERCEL_ORG_ID }}
+                vercelProject: ${{ secrets.VERCEL_PROJECT_ID }}
+                vercelToken: ${{ secrets.VERCEL_TOKEN }}
+                opItem: op://gitbook-open/2v-production
+                opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+    deploy-v2-cloudflare:
+        name: Deploy v2 to Cloudflare Worker (production)
+        runs-on: ubuntu-latest
+        environment: 
+            name: 2c-production
+            url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy
+              id: deploy
+              uses: ./.github/composite/deploy-cloudflare
+              with:
+                  environment: production
+                  deploy: true
+                  apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+                  accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+                  opItem: op://gitbook-open/2c-production
+                  opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+            - name: Outputs
+              run: |
+                  echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
@@ -0,0 +1,53 @@
+name: Staging
+on:
+    push:
+        branches:
+            - main
+env:
+    NPM_TOKEN_READONLY: ${{ secrets.NPM_TOKEN_READONLY }}
+jobs:
+    deploy-v2-vercel:
+        name: Deploy v2 to Vercel (staging)
+        runs-on: ubuntu-latest
+        environment: 
+            name: 2v-staging
+            url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy staging
+              id: deploy
+              uses: ./.github/composite/deploy-vercel
+              with:
+                environment: staging
+                vercelOrg: ${{ secrets.VERCEL_ORG_ID }}
+                vercelProject: ${{ secrets.VERCEL_PROJECT_ID }}
+                vercelToken: ${{ secrets.VERCEL_TOKEN }}
+                opItem: op://gitbook-open/2v-staging
+                opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+    deploy-v2-cloudflare:
+        name: Deploy v2 to Cloudflare Worker (staging)
+        runs-on: ubuntu-latest
+        environment: 
+            name: 2c-staging
+            url: ${{ steps.deploy.outputs.deployment-url }}
+        outputs:
+            deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Deploy
+              id: deploy
+              uses: ./.github/composite/deploy-cloudflare
+              with:
+                  environment: staging
+                  deploy: true
+                  apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+                  accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+                  opItem: op://gitbook-open/2c-staging
+                  opServiceAccount: ${{ secrets.OP_SERVICE_ACCOUNT_TOKEN }}
+            - name: Outputs
+              run: |
+                  echo "URL: ${{ steps.deploy.outputs.deployment-url }}"
@@ -17,10 +17,8 @@ jobs:
              with:
                  # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
                  fetch-depth: 0
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
              run: bun install --frozen-lockfile
              env:
@@ -30,6 +28,7 @@ jobs:
              uses: changesets/action@v1
              with:
                  publish: npm run release
+                  version: npm run changeset-version
              env:
                  # Using a PAT instead of GITHUB_TOKEN because we need to run workflows when releases are created
                  # https://github.com/orgs/community/discussions/26875#discussioncomment-3253761
@@ -45,10 +44,8 @@ jobs:
        steps:
            - name: Checkout Repo
              uses: actions/checkout@v3
-            - name: Setup bun
-              uses: oven-sh/setup-bun@v1
-              with:
-                  bun-version: 1.1.18
+            - name: Setup Bun
+              uses: ./.github/composite/setup-bun
            - name: Install dependencies
              run: bun install --frozen-lockfile
              env:
@@ -22,3 +22,6 @@ yarn-error.log*

 # Env files
 .env.local
+
+# TypeScript
+*.tsbuildinfo
@@ -1,10 +0,0 @@
-.next
-.vercel
-
-# Generated
-packages/emoji-codepoints/index.ts
-packages/gitbook/public/~gitbook/static/
-packages/icons/src/data/*.json
-
-# Build files
-dist/
@@ -1,5 +0,0 @@
-{
-    "printWidth": 100,
-    "singleQuote": true,
-    "tabWidth": 4
-}
@@ -0,0 +1,3 @@
+{
+    "recommendations": ["biomejs.biome"]
+}
@@ -7,5 +7,11 @@
        ["style \\=([^;]*);", "\"([^\"]*)\""],
        ["style \\=([^;]*);", "\\`([^\\`]*)\\`"]
    ],
-    "tailwindCSS.classAttributes": ["class", "className", "style", ".*Style"]
+    "tailwindCSS.classAttributes": ["class", "className", "style", ".*Style"],
+    "prettier.enable": false,
+    "editor.defaultFormatter": "biomejs.biome",
+    "editor.codeActionsOnSave": {
+        "source.organizeImports.biome": "explicit",
+        "source.fixAll.biome": "explicit"
+    }
 }
@@ -35,8 +35,10 @@ To run a local version of this project, please follow these simple steps.

 ### Prerequisites

-   Node.js (Version: >=18.x)
-   Bun
+-   Node.js (Version: >=20.6)
+  - Use nvm for easy Node management
+-   Bun (Version: >=1.2.1)
+  - We use a text-based lockfile which isn't supported below 1.2.1

 ### Set up

@@ -78,6 +80,26 @@ Any published GitBook site can be accessed through your local development instan

 All pull-requests will be tested against both visual and performances testing to prevent regressions.

+## Fonts and Icons
+
+GitBook Open uses fontawesome. During development, your local environment will use the free version. However, only the pro version will be accepted by CI. If you see the following error:
+
+```
+The GitBook icon is missing. It indicates that the dependencies were installed without the correct font-awesome package. These changes have probably been persisted in the Bun lockfile. Read the README for more information.
+```
+
+It means that you've changed the GBO dependencies and bundled in the free version. Only GitBook staff can help with this - if you're not on the GitBook team, please ping us in the PR and we'll help get things moving.
+
+If you are GitBook staff, you'll need our NPM token in your local environment.
+
+```
+.env.local
+
+NPM_TOKEN_READONLY=xxx
+```
+
+and then reinstall dependencies.
+
 ## Contributing

 GitBook's rendering engine is fully open source and built on top of [Next.js](https://nextjs.org/). Head to our [contributing guide](https://github.com/GitbookIO/gitbook/blob/main/.github/CONTRIBUTING.md) to learn more about the workflow on adding your first Pull Request.
@@ -0,0 +1,175 @@
+{
+    "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+    "vcs": {
+        "enabled": false,
+        "clientKind": "git",
+        "useIgnoreFile": false
+    },
+    "files": {
+        "ignoreUnknown": false,
+        "ignore": [
+            "**/node_modules/**/*",
+            "**/dist/**/*",
+            "**/build/**/*",
+            "**/public/**/*",
+            "**/.next/**/*",
+            "**/.open-next/**/*",
+            "**/.turbo/**/*",
+            "**/.vercel/**/*",
+            "**/.cache/**/*",
+            "**/.wrangler/**/*",
+            "packages/openapi-parser/src/fixtures/**/*",
+            "packages/emoji-codepoints/index.ts",
+            "packages/icons/src/data/*.json"
+        ]
+    },
+    "formatter": {
+        "enabled": true,
+        "useEditorconfig": true,
+        "formatWithErrors": false,
+        "indentStyle": "space",
+        "indentWidth": 4,
+        "lineEnding": "lf",
+        "lineWidth": 100,
+        "attributePosition": "auto",
+        "bracketSpacing": true
+    },
+    "organizeImports": {
+        "enabled": true
+    },
+    "linter": {
+        "enabled": true,
+        "rules": {
+            "recommended": true,
+            "performance": {
+                "noDelete": "warn"
+            },
+            "security": {
+                "noDangerouslySetInnerHtml": "off"
+            },
+            "complexity": {
+                "noForEach": "off",
+                "noUselessFragments": "warn",
+                "noBannedTypes": "warn"
+            },
+            "correctness": {
+                "noUndeclaredVariables": "error",
+                "noUnusedVariables": "error",
+                "useArrayLiterals": "error",
+                "useHookAtTopLevel": "error",
+                "noUnusedImports": "error",
+                "noVoidElementsWithChildren": "warn",
+                "useJsxKeyInIterable": "warn",
+                "useExhaustiveDependencies": "warn",
+                "noUnknownFunction": "warn"
+            },
+            "style": {
+                "noNonNullAssertion": "warn",
+                "noParameterAssign": "off",
+                "useThrowOnlyError": "error"
+            },
+            "suspicious": {
+                "noConsole": {
+                    "level": "warn",
+                    "options": {
+                        "allow": ["assert", "error", "warn"]
+                    }
+                },
+                "noExplicitAny": "warn",
+                "noImplicitAnyLet": "warn",
+                "noConfusingVoidType": "warn",
+                "noControlCharactersInRegex": "warn",
+                "noPrototypeBuiltins": "warn",
+                "noAssignInExpressions": "warn",
+                "noArrayIndexKey": "warn"
+            },
+            "a11y": {
+                "useSemanticElements": "warn",
+                "useKeyWithClickEvents": "warn",
+                "noSvgWithoutTitle": "warn",
+                "useButtonType": "warn",
+                "useIframeTitle": "warn",
+                "useAltText": "warn",
+                "noPositiveTabindex": "warn",
+                "useFocusableInteractive": "warn",
+                "useAriaPropsForRole": "warn",
+                "useValidAnchor": "warn",
+                "noLabelWithoutControl": "warn",
+                "noNoninteractiveTabindex": "warn"
+            },
+            "nursery": {
+                "useSortedClasses": {
+                    "level": "error",
+                    "fix": "safe",
+                    "options": {
+                        "attributes": ["class", "className", "style"],
+                        "functions": ["clsx", "tw"]
+                    }
+                }
+            }
+        }
+    },
+    "javascript": {
+        "formatter": {
+            "jsxQuoteStyle": "double",
+            "quoteProperties": "asNeeded",
+            "trailingCommas": "es5",
+            "semicolons": "always",
+            "arrowParentheses": "always",
+            "bracketSameLine": false,
+            "quoteStyle": "single",
+            "attributePosition": "auto",
+            "bracketSpacing": true
+        }
+    },
+    "overrides": [
+        {
+            "include": [
+                "packages/gitbook/**/*",
+                "packages/gitbook-v2/**/*",
+                "packages/react-openapi/**/*",
+                "packages/react-math/**/*",
+                "packages/react-contentkit/**/*",
+                "packages/icons/**/*"
+            ],
+            "javascript": {
+                "globals": ["React"]
+            }
+        },
+        {
+            "include": ["packages/gitbook/**/*"],
+            "javascript": {
+                "globals": ["React", "GitBookIntegrationEvent"]
+            }
+        },
+        {
+            "include": ["*.css"],
+            "javascript": {
+                "globals": ["theme"]
+            }
+        },
+        {
+            "include": ["*.test.ts", "packages/gitbook/tests/**/*"],
+            "javascript": {
+                "globals": ["Bun"]
+            }
+        },
+        {
+            "include": [
+                "packages/cache-do/**/*",
+                "packages/gitbook/cf-env.d.ts",
+                "packages/gitbook/src/cloudflare-entrypoint.ts"
+            ],
+            "javascript": {
+                "globals": [
+                    "DurableObjectLocationHint",
+                    "DurableObjectNamespace",
+                    "DurableObjectStub",
+                    "ContinentCode",
+                    "Fetcher",
+                    "ExportedHandler"
+                ]
+            }
+        }
+    ]
+}
@@ -1,2 +1,2 @@
 [install.scopes]
-"awesome.me" = { token = "$NPMRC_FONT_AWESOME_TOKEN", url = "https://npm.fontawesome.com/" }
+"gitbook" = { token = "$NPM_TOKEN_READONLY", url = "https://registry.npmjs.org" }
@@ -1,22 +0,0 @@
-# Caching
-
-## Revalidating the cache
-
-Invalidate cache can be done at two levels using tags:
-
-   Data fetching cache
-   Rendering cache
-
-To invalidate and refetch the data cache, you can execute a POST request to `/~/gitbook/revalidate`:
-
-```bash
-curl --location --request POST 'https://gitbook/mycompany.com/~gitbook/revalidate' \
--header 'Content-Type: application/json' \
--data-raw '{"tags": ["space.id"]}'
-```
-
-To invalidate the rendering cache, the implementation mainly depends on the infrastructure serving the content, GitBook outputs a `Cache-Tag` header on every requests. The value of the header is a comma separated list of tags.
-
-## Purging the cache
-
-Purging the cache, without revalidating, is done by passing `"purge": true` in the request body.
@@ -2,33 +2,41 @@
    "name": "gitbook",
    "version": "0.1.0",
    "devDependencies": {
-        "@changesets/cli": "^2.27.7",
-        "prettier": "^3.0.3",
-        "turbo": "^2.1.2"
+        "@biomejs/biome": "^1.9.4",
+        "@changesets/cli": "^2.27.12",
+        "turbo": "^2.4.4",
+        "vercel": "^39.3.0"
    },
-    "packageManager": "bun@1.1.18",
-    "patchedDependencies": {
-        "@vercel/next@4.3.15": "patches/@vercel%2Fnext@4.3.15.patch"
+    "packageManager": "bun@1.2.4",
+    "overrides": {
+        "@codemirror/state": "6.4.1",
+        "react": "18.3.1",
+        "react-dom": "18.3.1",
+        "@gitbook/api": "0.99.0"
    },
    "private": true,
    "scripts": {
        "dev": "turbo run dev",
+        "dev:v2": "turbo run dev:v2",
        "build": "turbo run build",
-        "build:cloudflare": "turbo run build:cloudflare",
-        "lint": "turbo run lint",
-        "lint:fix": "turbo run lint -- --fix",
+        "build:v2": "turbo run build:v2",
+        "clean-deps": "rm -rf node_modules && rm -rf packages/*/node_modules",
        "typecheck": "turbo run typecheck",
-        "format": "prettier ./ --ignore-unknown --write",
-        "format:check": "prettier ./ --ignore-unknown --list-different",
+        "format": "biome check --write ./",
+        "format:check": "biome check --diagnostic-level=error ./",
        "unit": "turbo run unit",
        "e2e": "turbo run e2e",
+        "e2e-customers": "turbo run e2e-customers",
        "changeset": "changeset",
+        "changeset-version": "changeset version && bun run format",
        "release": "turbo run release && changeset publish",
        "release:preview": "turbo run release:preview",
        "download:env": "op read op://gitbook-x-dev/gitbook-open/.env.local >> .env.local",
        "clean": "turbo run clean"
    },
-    "workspaces": [
-        "packages/*"
-    ]
+    "workspaces": ["packages/*"],
+    "patchedDependencies": {
+        "decode-named-character-reference@1.0.2": "patches/decode-named-character-reference@1.0.2.patch",
+        "@vercel/next@4.4.2": "patches/@vercel%2Fnext@4.4.2.patch"
+    }
 }
@@ -1,5 +1,11 @@
 # @gitbook/cache-do

+## 0.1.1
+
+### Patch Changes
+
+-   b7a5106: Disable cloudflare observability in production
+
 ## 0.1.0

 ### Minor Changes
@@ -14,14 +14,14 @@
            "default": "./dist/api.js"
        }
    },
-    "version": "0.1.0",
+    "version": "0.1.1",
    "dependencies": {
        "@msgpack/msgpack": "^3.0.0-beta2",
        "lru_map": "^0.4.1"
    },
    "devDependencies": {
        "typescript": "^5.5.3",
-        "wrangler": "3.82.0"
+        "wrangler": "^3.112.0"
    },
    "scripts": {
        "generate": "wrangler types --experimental-include-runtime",
@@ -31,12 +31,5 @@
        "release": "wrangler deploy",
        "release:preview": "wrangler deploy && wrangler deploy --env preview"
    },
-    "files": [
-        "dist",
-        "src",
-        "bin",
-        "data",
-        "README.md",
-        "CHANGELOG.md"
-    ]
+    "files": ["dist", "src", "bin", "data", "README.md", "CHANGELOG.md"]
 }
@@ -1,5 +1,5 @@
-import { encode, decode } from '@msgpack/msgpack';
 import { DurableObject } from 'cloudflare:workers';
+import { decode, encode } from '@msgpack/msgpack';
 import { LRUMap } from 'lru_map';

 export interface CacheObjectDescriptor {
@@ -137,7 +137,7 @@ export class CacheObject extends DurableObject {
     */
    public async purge() {
        return this.logOperation({ operation: 'purge' }, async (setLog) => {
-            let result = new Set<string>();
+            const result = new Set<string>();

            try {
                // List all the keys in the cache object.
@@ -149,11 +149,7 @@ export class CacheObject extends DurableObject {
                entries.forEach((exp) => {
                    result.add(exp.k);
                });
-            } catch (error) {
-                // If an error occurs, reset the cache object.
-                // This is a safety mechanism to prevent the cache object from being stuck in a bad state.
-                console.error('Error during purge, resetting the cache object', error);
-            }
+            } catch (_error) {}

            await this.reset();
            return Array.from(result);
@@ -174,7 +170,7 @@ export class CacheObject extends DurableObject {
                const toDeleteSet = new Set<string>();

                for (const [key, exp] of entries) {
-                    const timestamp = parseInt(key.split('.')[1]);
+                    const timestamp = Number.parseInt(key.split('.')[1]);
                    if (timestamp < Date.now()) {
                        toDeleteSet.add(key);
                        for (let i = 0; i < exp.c; i++) {
@@ -194,10 +190,7 @@ export class CacheObject extends DurableObject {
                if (toDelete.length) {
                    await this.ctx.storage.setAlarm(Date.now() + 12 * 60 * 60 * 1000);
                }
-            } catch (error) {
-                // If an error occurs, reset the cache object.
-                // This is a safety mechanism to prevent the cache object from being stuck in a bad state.
-                console.error('Error during alarm, reset the cache object', error);
+            } catch (_error) {
                await this.reset();
            }
        });
@@ -218,10 +211,10 @@ export class CacheObject extends DurableObject {
     */
    async logOperation<T>(
        log: Record<string, unknown>,
-        fn: (update: (log: Record<string, unknown>) => void) => Promise<T>,
+        fn: (update: (log: Record<string, unknown>) => void) => Promise<T>
    ): Promise<T> {
        const objectId = this.ctx.id.name ?? this.ctx.id.toString();
-        let update: Record<string, unknown> = {};
+        const update: Record<string, unknown> = {};
        const start = performance.now();
        try {
            return await fn((arg) => {
@@ -265,7 +258,7 @@ function encodeChunks<T>(key: string, value: T): Record<string, Uint8Array> {
 function decodeChunks<T>(entries: Map<string, Uint8Array>): { value: T; size: number } | undefined {
    const chunks = Array.from(entries.entries())
        .map(([key, value]) => {
-            const index = parseInt(key.split('.').pop()!);
+            const index = Number.parseInt(key.split('.').pop()!);
            return [index, value] as const;
        })
        .sort(([a], [b]) => a - b)
@@ -1,4 +1,4 @@
-import type { CacheObject, CacheObjectDescriptor } from './CacheObject';
+import type { CacheObject } from './CacheObject';

 export type CacheLocationId = ContinentCode;
 const allLocations: CacheLocationId[] = ['AF', 'AS', 'NA', 'SA', 'AN', 'EU', 'OC'];
@@ -30,7 +30,7 @@ export class CacheObjectStub {
        /** ID of the location to target */
        private locationId: CacheLocationId,
        /** Name of the tag */
-        private tag: string,
+        private tag: string
    ) {
        const groupId = getCacheObjectIdName(this.locationId, this.tag);
        this.stub = this.doNamespace.get(this.doNamespace.idFromName(groupId), {
@@ -85,7 +85,7 @@ export class CacheObjectStub {
                });
                const locationkeys = await cacheGroup.purge();
                locationkeys.forEach((key) => keys.add(key));
-            }),
+            })
        );

        return keys;
@@ -11,8 +11,7 @@ migrations = [
 ]

 [observability]
-enabled = true
-head_sampling_rate = 0.01
+enabled = false

 [env.preview]
 name = "gitbook-open-cache-preview"
@@ -25,4 +24,4 @@ migrations = [

 [env.preview.observability]
 enabled = true
-head_sampling_rate = 1
+head_sampling_rate = 0.1
@@ -0,0 +1 @@
+dist/
@@ -0,0 +1,13 @@
+# @gitbook/cache-tags
+
+## 0.2.0
+
+### Minor Changes
+
+- f32bf1f: Export function `getCacheTagForURL` to easily get the cache tag for a URL.
+
+## 0.1.0
+
+### Minor Changes
+
+- 05ffd0e: Initial version of the package
@@ -0,0 +1,3 @@
+# `@gitbook/cache-tags`
+
+Utility to generate cache tags for GitBook Open.
@@ -0,0 +1,25 @@
+{
+    "name": "@gitbook/cache-tags",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "development": "./src/index.ts",
+            "default": "./dist/index.js"
+        }
+    },
+    "version": "0.2.0",
+    "dependencies": {
+        "@gitbook/api": "*",
+        "assert-never": "^1.2.1"
+    },
+    "devDependencies": {
+        "typescript": "^5.5.3"
+    },
+    "scripts": {
+        "build": "tsc",
+        "typecheck": "tsc --noEmit",
+        "dev": "tsc -w"
+    },
+    "files": ["dist", "src", "README.md", "CHANGELOG.md"]
+}
@@ -0,0 +1,186 @@
+import type { ComputedContentSource } from '@gitbook/api';
+import assertNever from 'assert-never';
+
+/**
+ * Get a stringified cache tag for a given object.
+ */
+export function getCacheTag(
+    spec: /**
+     * All data related to a user
+     * @deprecated - in v2, no tag as this is an immutable data
+     */
+        | {
+              tag: 'user';
+              user: string;
+          }
+        /**
+         * All data related to a space
+         */
+        | {
+              tag: 'space';
+              space: string;
+          }
+        /**
+         * All data related to an integration.
+         */
+        | {
+              tag: 'integration';
+              integration: string;
+          }
+        /**
+         * All data related to a change request
+         */
+        | {
+              tag: 'change-request';
+              space: string;
+              changeRequest: string;
+          }
+        /**
+         * Immutable data related to a revision
+         * @deprecated - in v2, no tag as this is an immutable data
+         */
+        | {
+              tag: 'revision';
+              space: string;
+              revision: string;
+          }
+        /**
+         * Immutable data related to a document
+         * @deprecated - in v2, no tag as this is an immutable data
+         */
+        | {
+              tag: 'document';
+              space: string;
+              document: string;
+          }
+        /**
+         * Immutable data related to a computed document
+         * @deprecated - in v2, no tag as this is an immutable data
+         */
+        | {
+              tag: 'computed-document';
+              space: string;
+              integration: string;
+          }
+        /**
+         * All data related to the URL of a content
+         */
+        | {
+              tag: 'url';
+              hostname: string;
+          }
+        /**
+         * All data related to a site
+         */
+        | {
+              tag: 'site';
+              site: string;
+          }
+        /**
+         * All data related to an OpenAPI spec
+         */
+        | {
+              tag: 'openapi';
+              organization: string;
+              openAPISpec: string;
+          }
+): string {
+    switch (spec.tag) {
+        case 'user':
+            return `user:${spec.user}`;
+        case 'url':
+            return `url:${spec.hostname}`;
+        case 'space':
+            return `space:${spec.space}`;
+        case 'change-request':
+            return `space:${spec.space}:change-request:${spec.changeRequest}`;
+        case 'revision':
+            return `space:${spec.space}:revision:${spec.revision}`;
+        case 'document':
+            return `space:${spec.space}:document:${spec.document}`;
+        case 'computed-document':
+            return `space:${spec.space}:computed-document:${spec.integration}`;
+        case 'site':
+            return `site:${spec.site}`;
+        case 'integration':
+            return `integration:${spec.integration}`;
+        case 'openapi':
+            return `organization:${spec.organization}:openapi:${spec.openAPISpec}`;
+        default:
+            assertNever(spec);
+    }
+}
+
+/**
+ * Get the cache tag for a given URL.
+ */
+export function getCacheTagForURL(url: string | URL) {
+    const parsedURL = url instanceof URL ? url : new URL(url);
+    return getCacheTag({
+        tag: 'url',
+        hostname: parsedURL.hostname,
+    });
+}
+
+/**
+ * Get the tags for a computed content source.
+ */
+export function getComputedContentSourceCacheTags(
+    inContext: {
+        spaceId: string;
+        organizationId: string;
+    },
+    source: ComputedContentSource
+) {
+    const tags: string[] = [];
+
+    // We add the dependencies as tags, to ensure that the computed content is invalidated
+    // when the dependencies are updated.
+    const dependencies = Object.values(source.dependencies ?? {});
+    if (dependencies.length > 0) {
+        dependencies.forEach((dependency) => {
+            switch (dependency.ref.kind) {
+                case 'space':
+                    tags.push(
+                        getCacheTag({
+                            tag: 'space',
+                            space: dependency.ref.space,
+                        })
+                    );
+                    break;
+                case 'openapi':
+                    tags.push(
+                        getCacheTag({
+                            tag: 'openapi',
+                            organization: inContext.organizationId,
+                            openAPISpec: dependency.ref.spec,
+                        })
+                    );
+                    break;
+                default:
+                    // Do not throw for unknown dependency types
+                    // as it might mean we are lacking behind the API version
+                    break;
+            }
+        });
+    } else {
+        // Push a dummy tag, as the v1 is only using the first tag
+        tags.push(
+            getCacheTag({
+                tag: 'computed-document',
+                space: inContext.spaceId,
+                integration: source.integration,
+            })
+        );
+    }
+
+    // We invalidate the computed content when a new version of the integration is deployed.
+    tags.push(
+        getCacheTag({
+            tag: 'integration',
+            integration: source.integration,
+        })
+    );
+
+    return tags;
+}
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "target": "esnext",
+        "lib": ["dom", "dom.iterable", "esnext"],
+        "allowJs": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "noEmit": false,
+        "declaration": true,
+        "outDir": "dist",
+        "esModuleInterop": true,
+        "module": "esnext",
+        "moduleResolution": "bundler",
+        "resolveJsonModule": true,
+        "isolatedModules": true,
+        "jsx": "react-jsx",
+        "incremental": true,
+        "types": [
+            "bun-types" // add Bun global
+        ]
+    },
+    "include": ["src/**/*.ts", "src/**/*.tsx"],
+    "exclude": ["node_modules"]
+}
@@ -0,0 +1 @@
+dist/
@@ -0,0 +1,13 @@
+# @gitbook/colors
+
+## 0.3.0
+
+### Minor Changes
+
+- 4f0a772: Override tint lightness if supplied color is out of bounds
+
+## 0.2.0
+
+### Minor Changes
+
+- 445baaa: Initial release
@@ -0,0 +1,3 @@
+# `@gitbook/colors`
+
+A set of default colors and transformation functions used throughout the GitBook Open and app.
@@ -0,0 +1,21 @@
+{
+    "name": "@gitbook/colors",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "development": "./src/index.ts",
+            "default": "./dist/index.js"
+        }
+    },
+    "version": "0.3.0",
+    "devDependencies": {
+        "typescript": "^5.5.3"
+    },
+    "scripts": {
+        "build": "tsc",
+        "typecheck": "tsc --noEmit",
+        "dev": "tsc -w"
+    },
+    "files": ["dist", "src", "README.md", "CHANGELOG.md"]
+}
@@ -0,0 +1,39 @@
+/**
+ * Default primary color throughout the GitBook ecosystem.
+ */
+export const DEFAULT_PRIMARY_COLOR = '#346DDB';
+
+/**
+ * The darkest color that exists in GitBook, used as the relative minimum of every generated color scale.
+ */
+export const DARK_BASE = '#1D1D1D';
+
+/**
+ * The lightest color that exists in GitBook, used as the relative maximum of every generated color scale.
+ */
+export const LIGHT_BASE = '#FFFFFF';
+
+/**
+ * Used as the basis of all UI elements that are not colored by the primary color. Neutral gray by default, overridden by site customization.
+ */
+export const DEFAULT_TINT_COLOR = '#787878';
+
+/**
+ * Used for informational messages and neutral alerts.
+ */
+export const DEFAULT_HINT_INFO_COLOR = '#787878';
+
+/**
+ * Used for showing important information or non-critical warnings.
+ */
+export const DEFAULT_HINT_WARNING_COLOR = '#FE9A00';
+
+/**
+ * Used for destructive actions or raising attention to critical information.
+ */
+export const DEFAULT_HINT_DANGER_COLOR = '#FB2C36';
+
+/**
+ * Used for showing positive actions or achievements.
+ */
+export const DEFAULT_HINT_SUCCESS_COLOR = '#00C950';
@@ -0,0 +1,2 @@
+export * from './colors';
+export * from './transformations';
@@ -0,0 +1,422 @@
+import { DARK_BASE, DEFAULT_TINT_COLOR, LIGHT_BASE } from './colors';
+
+type ColorShades = {
+    [key: string]: string;
+};
+
+type RGBColor = [number, number, number];
+type OKLABColor = { L: number; A: number; B: number };
+type OKLCHColor = { L: number; C: number; H: number };
+
+const D65 = [95.047, 100.0, 108.883]; // Reference white (D65)
+
+export enum ColorCategory {
+    backgrounds = 'backgrounds',
+    components = 'components',
+    borders = 'borders',
+    accents = 'accents',
+    text = 'text',
+}
+
+type ColorSubScale = {
+    [key: string]: number;
+};
+
+/**
+ * Main color scale object.
+ *
+ * Each `ColorCategory` can be in/excluded in Tailwind's utility classes generation.
+ * Each subitem maps a semantic name within that category to a step in the scale.
+ */
+export const scale: Record<ColorCategory, ColorSubScale> = {
+    [ColorCategory.backgrounds]: {
+        /** Base background */
+        base: 1,
+        /** Accent background */
+        subtle: 2,
+    },
+    [ColorCategory.components]: {
+        /** Component background */
+        DEFAULT: 3,
+        /** Component hover background */
+        hover: 4,
+        /** Component active background */
+        active: 5,
+    },
+    [ColorCategory.borders]: {
+        /** Subtle borders, separators */
+        subtle: 6,
+        /** Element border, focus rings */
+        DEFAULT: 7,
+        /** Element hover border */
+        hover: 8,
+    },
+    [ColorCategory.accents]: {
+        /** Solid backgrounds */
+        solid: 9,
+        /** Hovered solid backgrounds */
+        'solid-hover': 10,
+    },
+    [ColorCategory.text]: {
+        /** Very low-contrast text
+         * Caution: this contrast does not meet accessiblity guidelines.
+         * Always check if you need to include a mitigating contrast-more style for users who need it. */
+        subtle: 9,
+        /** Low-contrast text */
+        DEFAULT: 11,
+        /** High-contrast text */
+        strong: 12,
+    },
+};
+
+/**
+ * The mix of foreground and background for every step in a colour scale.
+ * 0: 100% of the background color's luminosity, white in light mode
+ * 1: 100% of the foreground color's luminosity, black in light mode
+ */
+export const colorMixMapping = {
+    // bgs          |components      |borders         |solid     |text
+    light: [0, 0.02, 0.03, 0.05, 0.07, 0.1, 0.15, 0.2, 0.5, 0.55, 0.6, 1],
+    dark: [0, 0.03, 0.08, 0.1, 0.13, 0.15, 0.2, 0.25, 0.5, 0.55, 0.75, 1],
+};
+
+/**
+ * Convert a hex color to an RGB color.
+ */
+export function hexToRgb(hex: string): string {
+    const [r, g, b] = hexToRgbArray(hex);
+    // Return the RGB values separated by spaces
+    return `${r} ${g} ${b}`;
+}
+
+/**
+ * Convert a hex color to a RGBA color.
+ */
+export function hexToRgba(hex: string, alpha: number): string {
+    const [r, g, b] = hexToRgbArray(hex);
+    // Return the RGBA values separated by spaces
+    return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+}
+
+/**
+ * Generate Tailwind-compatible shades from a single color
+ * @param {string} hex The hex code to generate shades from
+ * @param {boolean} halfShades Generate additional shades, e.g. at 150
+ * @returns {{[key: number]: string}}
+ */
+export function shadesOfColor(hex: string, halfShades = false) {
+    const baseColor = hex;
+
+    const shades = [
+        50,
+        100,
+        200,
+        300,
+        400,
+        500,
+        600,
+        700,
+        800,
+        900,
+        ...(halfShades ? [150, 250, 350, 450, 550, 650, 750, 850] : []),
+    ].sort();
+
+    const result: ColorShades = {};
+
+    for (const shade of shades) {
+        const key = shade.toString();
+
+        if (shade === 500) {
+            result[key] = hex;
+            continue;
+        }
+
+        let shadeIndex = shade;
+        const isDarkShade = shadeIndex > 500;
+        if (isDarkShade) {
+            shadeIndex -= 500;
+        }
+
+        const percentage = shadeIndex / 500;
+        const startColor = isDarkShade ? DARK_BASE : baseColor;
+        const endColor = isDarkShade ? baseColor : LIGHT_BASE;
+
+        result[key] = getColor(percentage, hexToRgbArray(startColor), hexToRgbArray(endColor));
+    }
+
+    return result;
+}
+
+export type ColorScaleOptions = {
+    /** If set to `true`, inverts the scale (so 1 is black instead of white) and uses `colorMixMapping.dark` with different mix ratios per step. */
+    darkMode?: boolean;
+
+    /** Define a custom background color to use. If left undefined, the global `light`/`dark` values (in `colors.ts`) will be used. */
+    background?: string;
+
+    /** Define a custom foreground color to use. If left undefined, the global `light`/`dark` values (in `colors.ts`) will be used. */
+    foreground?: string;
+
+    mix?: {
+        /** If set to a hex code, this color will be additionally mixed into the generated scale according to `mix.ratio`. */
+        color: string;
+
+        /** Define a custom mix ratio to mix the `mix` color with. If left undefined, the default ratio will be used. */
+        ratio: number;
+    };
+};
+
+/**
+ * Generate a [Radix-like](https://www.radix-ui.com/colors/docs/palette-composition/understanding-the-scale) colour scale based of a hex colour.
+ * @param {string} hex The hex code to generate shades from
+ * @param {object} options
+ */
+export function colorScale(
+    hex: string,
+    {
+        darkMode = false,
+        background = darkMode ? DARK_BASE : LIGHT_BASE,
+        foreground = darkMode ? LIGHT_BASE : DARK_BASE,
+        mix,
+    }: ColorScaleOptions = {}
+) {
+    const baseColor = rgbToOklch(hexToRgbArray(hex));
+    const mixColor = mix?.color ? rgbToOklch(hexToRgbArray(mix.color)) : null;
+    const foregroundColor = rgbToOklch(hexToRgbArray(foreground));
+    const backgroundColor = rgbToOklch(hexToRgbArray(background));
+    let mapping = darkMode ? colorMixMapping.dark : colorMixMapping.light;
+
+    if (mixColor && mix?.ratio && mix.ratio > 0) {
+        // If defined, we mix in a (tiny) bit of the mix color with the base color.
+        baseColor.L = mixColor.L * mix.ratio + baseColor.L * (1 - mix.ratio);
+        baseColor.C = mixColor.C * mix.ratio + baseColor.C * (1 - mix.ratio);
+        baseColor.H = mix.color === DEFAULT_TINT_COLOR ? baseColor.H : mixColor.H;
+    }
+
+    if (
+        (darkMode && baseColor.L < backgroundColor.L) ||
+        (!darkMode && baseColor.L > backgroundColor.L)
+    ) {
+        // If the supplied color is outside of our lightness bounds, use the supplied color's lightness.
+        // This is mostly used to allow darker-than-dark backgrounds for brands that specifically want that look.
+        const difference = (backgroundColor.L - baseColor.L) / backgroundColor.L;
+        backgroundColor.L = baseColor.L;
+        // At the edges of the scale, the subtle lightness changes stop being perceptible. We need to amp up our mapping to still stand out.
+        const amplifier = 1;
+        mapping = mapping.map((step, index) =>
+            index < 9 ? step + step * amplifier * difference : step
+        );
+    }
+
+    const result = [];
+
+    for (let index = 0; index < mapping.length; index++) {
+        const targetL =
+            foregroundColor.L * mapping[index] + backgroundColor.L * (1 - mapping[index]);
+
+        if (index === 8 && !mix && Math.abs(baseColor.L - targetL) < 0.2) {
+            // Original colour is close enough to target, so let's use the original colour as step 9.
+            result.push(hex);
+            continue;
+        }
+
+        const chromaRatio = index < 8 ? (index + 1) * 0.05 : 1;
+
+        const shade = {
+            L: targetL, // Blend lightness
+            C: baseColor.C * chromaRatio,
+            H: baseColor.H, // Maintain the hue from the base color
+        };
+
+        const newHex = rgbArrayToHex(oklchToRgb(shade));
+
+        result.push(newHex);
+    }
+
+    return result;
+}
+
+/**
+ * Convert a hex color to an RGB color set.
+ */
+export function hexToRgbArray(hex: string): RGBColor {
+    const originalHex = hex;
+
+    let value = hex.replace('#', '');
+    if (hex.length === 3) value = value + value;
+
+    const r = value.substring(0, 2);
+    const g = value.substring(2, 4);
+    const b = value.substring(4, 6);
+
+    const rgb = [r, g, b].map((channel) => {
+        try {
+            const channelInt = Number.parseInt(channel, 16);
+            if (channelInt < 0 || channelInt > 255) throw new Error();
+            return channelInt;
+        } catch {
+            throw new Error(`Invalid hex color provided: ${originalHex}`);
+        }
+    });
+
+    return rgb as RGBColor;
+}
+
+/**
+ * Convert a RGB color set to a hex color.
+ */
+export function rgbArrayToHex(rgb: RGBColor): string {
+    return `#${rgb
+        .map((channel) => {
+            const component = channel.toString(16);
+            if (component.length === 1) return `0${component}`;
+            return component;
+        })
+        .join('')}`;
+}
+
+export function getColor(percentage: number, start: RGBColor, end: RGBColor) {
+    const rgb = end.map((channel, index) => {
+        return Math.round(channel + percentage * (start[index] - channel));
+    });
+
+    return rgbArrayToHex(rgb as RGBColor);
+}
+
+// Utility constants and helper functions
+export function rgbToLinear(rgb: RGBColor): [number, number, number] {
+    return rgb.map((v) => {
+        const scaled = v / 255;
+        return scaled <= 0.04045 ? scaled / 12.92 : ((scaled + 0.055) / 1.055) ** 2.4;
+    }) as [number, number, number];
+}
+
+export function linearToRgb(linear: [number, number, number]): RGBColor {
+    return linear.map((v) => {
+        const scaled = v <= 0.0031308 ? 12.92 * v : 1.055 * v ** (1 / 2.4) - 0.055;
+        return Math.round(Math.max(0, Math.min(1, scaled)) * 255);
+    }) as RGBColor;
+}
+
+export function rgbToOklab(rgb: RGBColor): OKLABColor {
+    const [r, g, b] = rgbToLinear(rgb);
+
+    const l = 0.4122214708 * r + 0.5363325363 * g + 0.0514459929 * b;
+    const m = 0.2119034982 * r + 0.6806995451 * g + 0.1073969566 * b;
+    const s = 0.0883024619 * r + 0.2817188376 * g + 0.6299787005 * b;
+
+    const lRoot = Math.cbrt(l);
+    const mRoot = Math.cbrt(m);
+    const sRoot = Math.cbrt(s);
+
+    return {
+        L: 0.2104542553 * lRoot + 0.793617785 * mRoot - 0.0040720468 * sRoot,
+        A: 1.9779984951 * lRoot - 2.428592205 * mRoot + 0.4505937099 * sRoot,
+        B: 0.0259040371 * lRoot + 0.7827717662 * mRoot - 0.808675766 * sRoot,
+    };
+}
+
+export function oklabToRgb(oklab: OKLABColor): RGBColor {
+    const { L, A, B } = oklab;
+
+    const lRoot = L + 0.3963377774 * A + 0.2158037573 * B;
+    const mRoot = L - 0.1055613458 * A - 0.0638541728 * B;
+    const sRoot = L - 0.0894841775 * A - 1.291485548 * B;
+
+    const l = lRoot ** 3;
+    const m = mRoot ** 3;
+    const s = sRoot ** 3;
+
+    const r = 4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s;
+    const g = -1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s;
+    const b = -0.0041960863 * l - 0.7034186147 * m + 1.707614701 * s;
+
+    return linearToRgb([r, g, b]);
+}
+
+export function oklabToOklch(oklab: OKLABColor): OKLCHColor {
+    const { L, A, B } = oklab;
+    const C = Math.sqrt(A ** 2 + B ** 2);
+    const H = (Math.atan2(B, A) * 180) / Math.PI;
+    return { L, C, H: H < 0 ? H + 360 : H };
+}
+
+export function oklchToOklab(oklch: OKLCHColor): OKLABColor {
+    const { L, C, H } = oklch;
+    const rad = (H * Math.PI) / 180;
+    return {
+        L,
+        A: C * Math.cos(rad),
+        B: C * Math.sin(rad),
+    };
+}
+
+export function rgbToOklch(rgb: RGBColor): OKLCHColor {
+    return oklabToOklch(rgbToOklab(rgb));
+}
+
+export function oklchToRgb(oklch: OKLCHColor): RGBColor {
+    return oklabToRgb(oklchToOklab(oklch));
+}
+
+export function rgbToXyz(rgb: RGBColor): [number, number, number] {
+    const [r, g, b] = rgbToLinear(rgb);
+    return [
+        (r * 0.4124564 + g * 0.3575761 + b * 0.1804375) * 100,
+        (r * 0.2126729 + g * 0.7151522 + b * 0.072175) * 100,
+        (r * 0.0193339 + g * 0.119192 + b * 0.9503041) * 100,
+    ];
+}
+
+export function xyzToLab65(xyz: [number, number, number]): {
+    L: number;
+    A: number;
+    B: number;
+} {
+    const [x, y, z] = xyz.map((v, i) => {
+        const scaled = v / D65[i];
+        return scaled > 0.008856 ? Math.cbrt(scaled) : 7.787 * scaled + 16 / 116;
+    });
+
+    return {
+        L: 116 * y - 16,
+        A: 500 * (x - y),
+        B: 200 * (y - z),
+    };
+}
+
+export function rgbTolab65(rgb: RGBColor): { L: number; A: number; B: number } {
+    return xyzToLab65(rgbToXyz(rgb));
+}
+
+/*
+  Delta Phi Star perceptual lightness contrast by Andrew Somers:
+  https://github.com/Myndex/deltaphistar 
+*/
+export const PHI = 0.5 + Math.sqrt(1.25);
+
+export function dpsContrast(a: RGBColor, b: RGBColor) {
+    const dps = Math.abs(rgbTolab65(a).L ** PHI - rgbTolab65(b).L ** PHI);
+    const contrast = dps ** (1 / PHI) * Math.SQRT2 - 40;
+    return contrast < 7.5 ? 0 : contrast;
+}
+
+export function colorContrast(background: string, foreground: string[] = [LIGHT_BASE, DARK_BASE]) {
+    const bg = hexToRgbArray(background);
+
+    const best: { color?: RGBColor; contrast: number } = {
+        color: undefined,
+        contrast: 0,
+    };
+    for (const color of foreground) {
+        const c = hexToRgbArray(color);
+
+        const contrast = dpsContrast(c, bg);
+        if (contrast > best.contrast) {
+            best.color = c;
+            best.contrast = contrast;
+        }
+    }
+
+    return best.color ? rgbArrayToHex(best.color) : foreground[0];
+}
@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "target": "esnext",
+        "lib": ["dom", "dom.iterable", "esnext"],
+        "allowJs": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "noEmit": false,
+        "declaration": true,
+        "outDir": "dist",
+        "esModuleInterop": true,
+        "module": "esnext",
+        "moduleResolution": "bundler",
+        "resolveJsonModule": true,
+        "isolatedModules": true,
+        "jsx": "react-jsx",
+        "incremental": true,
+        "types": [
+            "bun-types" // add Bun global
+        ]
+    },
+    "include": ["src/**/*.ts", "src/**/*.tsx"],
+    "exclude": ["node_modules"]
+}
@@ -17,12 +17,11 @@ Object.entries(emojis).forEach(([key, value]) => {
    if (emoji && key !== emoji) {
        output[key] = emoji;
    } else if (!emoji) {
-        console.log('No emoji for', key);
    }
 });

 fs.mkdirSync(path.resolve(__dirname, 'dist'), { recursive: true });
 fs.writeFileSync(
    path.resolve(__dirname, 'dist/index.ts'),
-    `export const emojiCodepoints: Record<string, string> = ${JSON.stringify(output, null, 4)};`,
+    `export const emojiCodepoints: Record<string, string> = ${JSON.stringify(output, null, 4)};`
 );
@@ -0,0 +1,11 @@
+# next.js
+/.next/
+
+# vercel
+.vercel
+
+# cloudflare
+.open-next
+
+# Symbolic links
+public
@@ -0,0 +1,34 @@
+# gitbook-v2
+
+## 0.2.1
+
+### Patch Changes
+
+- Updated dependencies [f32bf1f]
+  - @gitbook/cache-tags@0.2.0
+
+## 0.2.0
+
+### Minor Changes
+
+- 76c7974: Add route to revalidate cached data
+
+## 0.1.2
+
+### Patch Changes
+
+- 05ffd0e: Improving data cache management for computed content
+- Updated dependencies [05ffd0e]
+  - @gitbook/cache-tags@0.1.0
+
+## 0.1.1
+
+### Patch Changes
+
+- 3e11678: fix: lost section groups
+
+## 0.1.0
+
+### Minor Changes
+
+- cfccc44: Setup structure and deployment for new version
@@ -0,0 +1,5 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.
@@ -0,0 +1,47 @@
+// @ts-check
+
+/**
+ * @type {import('next').NextConfig}
+ */
+const nextConfig = {
+    experimental: {
+        useCache: true,
+    },
+
+    env: {
+        BUILD_VERSION: (process.env.GITHUB_SHA ?? '').slice(0, 7),
+
+        // GitBook envs
+        GITBOOK_API_URL: process.env.GITBOOK_API_URL,
+        GITBOOK_APP_URL: process.env.GITBOOK_APP_URL,
+        GITBOOK_INTEGRATIONS_HOST: process.env.GITBOOK_INTEGRATIONS_HOST,
+        GITBOOK_IMAGE_RESIZE_URL: process.env.GITBOOK_IMAGE_RESIZE_URL,
+        GITBOOK_ICONS_URL: process.env.GITBOOK_ICONS_URL,
+        GITBOOK_ICONS_TOKEN: process.env.GITBOOK_ICONS_TOKEN,
+        GITBOOK_URL: process.env.GITBOOK_URL,
+        GITBOOK_API_TOKEN: process.env.GITBOOK_API_TOKEN,
+        GITBOOK_ASSETS_PREFIX: process.env.GITBOOK_ASSETS_PREFIX,
+        GITBOOK_SECRET: process.env.GITBOOK_SECRET,
+        GITBOOK_IMAGE_RESIZE_SIGNING_KEY: process.env.GITBOOK_IMAGE_RESIZE_SIGNING_KEY,
+
+        // Next.js envs
+        NEXT_SERVER_ACTIONS_ENCRYPTION_KEY: process.env.NEXT_SERVER_ACTIONS_ENCRYPTION_KEY,
+
+        // Used to detect if the app is running in V2 mode
+        GITBOOK_V2: 'true',
+    },
+
+    assetPrefix: process.env.GITBOOK_ASSETS_PREFIX,
+    poweredByHeader: false,
+
+    images: {
+        remotePatterns: [
+            {
+                protocol: 'https',
+                hostname: '*.gitbook.io',
+            },
+        ],
+    },
+};
+
+export default nextConfig;
@@ -0,0 +1,10 @@
+import { defineCloudflareConfig } from '@opennextjs/cloudflare';
+import d1TagCache from '@opennextjs/cloudflare/d1-tag-cache';
+import kvIncrementalCache from '@opennextjs/cloudflare/kv-cache';
+import memoryQueue from '@opennextjs/cloudflare/memory-queue';
+
+export default defineCloudflareConfig({
+    incrementalCache: kvIncrementalCache,
+    queue: memoryQueue,
+    tagCache: d1TagCache,
+});
@@ -0,0 +1,32 @@
+{
+    "name": "gitbook-v2",
+    "version": "0.2.1",
+    "private": true,
+    "dependencies": {
+        "next": "^15.2.1",
+        "react": "^19.0.0",
+        "react-dom": "^19.0.0",
+        "@gitbook/api": "*",
+        "@gitbook/cache-tags": "workspace:*",
+        "@sindresorhus/fnv1a": "^3.1.0",
+        "server-only": "^0.0.1",
+        "warn-once": "^0.1.1"
+    },
+    "devDependencies": {
+        "gitbook": "*",
+        "@opennextjs/cloudflare": "^0.5.10",
+        "tailwindcss": "^3.4.0",
+        "postcss": "^8"
+    },
+    "scripts": {
+        "generate": "rm -rf ./public && cp -r ../gitbook/public ./public",
+        "dev:v2": "env-cmd --silent -f ../../.env.local next --turbopack",
+        "build": "next build",
+        "build:v2": "next build",
+        "start": "next start",
+        "build:v2:cloudflare": "opennextjs-cloudflare",
+        "dev:v2:cloudflare": "wrangler dev --port 8771",
+        "unit": "bun test",
+        "typecheck": "tsc --noEmit"
+    }
+}
@@ -0,0 +1,6 @@
+module.exports = {
+    plugins: {
+        tailwindcss: {},
+        autoprefixer: {},
+    },
+};
@@ -0,0 +1,5 @@
+import { SitePageSkeleton } from '@/components/SitePage';
+
+export default function Loading() {
+    return <SitePageSkeleton />;
+}
@@ -0,0 +1,5 @@
+import { SitePageNotFound } from '@/components/SitePage';
+
+export default async function NotFound() {
+    return <SitePageNotFound />;
+}
@@ -0,0 +1,36 @@
+import {
+    SitePage,
+    generateSitePageMetadata,
+    generateSitePageViewport,
+} from '@/components/SitePage';
+import { type RouteParams, getDynamicSiteContext, getPagePathFromParams } from '@v2/app/utils';
+import type { Metadata, Viewport } from 'next';
+
+type PageProps = {
+    params: Promise<RouteParams>;
+    searchParams: Promise<{ fallback?: string }>;
+};
+
+export default async function Page(props: PageProps) {
+    const params = await props.params;
+    const context = await getDynamicSiteContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    return <SitePage context={context} pageParams={{ pathname }} />;
+}
+
+export async function generateViewport(props: PageProps): Promise<Viewport> {
+    const context = await getDynamicSiteContext(await props.params);
+    return generateSitePageViewport(context);
+}
+
+export async function generateMetadata(props: PageProps): Promise<Metadata> {
+    const params = await props.params;
+    const context = await getDynamicSiteContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    return generateSitePageMetadata({
+        context,
+        pageParams: { pathname },
+    });
+}
@@ -0,0 +1,45 @@
+import { CustomizationRootLayout } from '@/components/RootLayout';
+import {
+    SiteLayout,
+    generateSiteLayoutMetadata,
+    generateSiteLayoutViewport,
+} from '@/components/SiteLayout';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+import { GITBOOK_DISABLE_TRACKING } from '@v2/lib/env';
+import { getThemeFromMiddleware, getVisitorAuthTokenFromMiddleware } from '@v2/lib/middleware';
+
+interface SiteDynamicLayoutProps {
+    params: Promise<RouteLayoutParams>;
+}
+
+export default async function SiteDynamicLayout({
+    params,
+    children,
+}: React.PropsWithChildren<SiteDynamicLayoutProps>) {
+    const context = await getDynamicSiteContext(await params);
+    const forcedTheme = await getThemeFromMiddleware();
+    const visitorAuthToken = await getVisitorAuthTokenFromMiddleware();
+
+    return (
+        <CustomizationRootLayout customization={context.customization}>
+            <SiteLayout
+                context={context}
+                forcedTheme={forcedTheme}
+                withTracking={!GITBOOK_DISABLE_TRACKING}
+                visitorAuthToken={visitorAuthToken}
+            >
+                {children}
+            </SiteLayout>
+        </CustomizationRootLayout>
+    );
+}
+
+export async function generateViewport({ params }: SiteDynamicLayoutProps) {
+    const context = await getDynamicSiteContext(await params);
+    return generateSiteLayoutViewport(context);
+}
+
+export async function generateMetadata({ params }: SiteDynamicLayoutProps) {
+    const context = await getDynamicSiteContext(await params);
+    return generateSiteLayoutMetadata(context);
+}
@@ -0,0 +1,12 @@
+import type { NextRequest } from 'next/server';
+
+import { serveLLMsTxt } from '@/routes/llms';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return serveLLMsTxt(context);
+}
@@ -0,0 +1,12 @@
+import type { NextRequest } from 'next/server';
+
+import { serveRobotsTxt } from '@/routes/robots';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return serveRobotsTxt(context);
+}
@@ -0,0 +1,12 @@
+import type { NextRequest } from 'next/server';
+
+import { servePagesSitemap } from '@/routes/sitemap';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return servePagesSitemap(context);
+}
@@ -0,0 +1,12 @@
+import type { NextRequest } from 'next/server';
+
+import { serveRootSitemap } from '@/routes/sitemap';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return serveRootSitemap(context);
+}
@@ -0,0 +1,12 @@
+import type { NextRequest } from 'next/server';
+
+import { serveIcon } from '@/routes/icon';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return serveIcon(context, request);
+}
@@ -0,0 +1,13 @@
+import type { NextRequest } from 'next/server';
+
+import type { PageIdParams } from '@/components/SitePage';
+import { serveOGImage } from '@/routes/ogimage';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams & PageIdParams> }
+) {
+    const context = await getDynamicSiteContext(await params);
+    return serveOGImage(context, await params);
+}
@@ -0,0 +1,12 @@
+import { PDFRootLayout } from '@/components/PDF';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export default async function RootLayout(props: {
+    params: Promise<RouteLayoutParams>;
+    children: React.ReactNode;
+}) {
+    const { params, children } = props;
+    const context = await getDynamicSiteContext(await params);
+
+    return <PDFRootLayout context={context}>{children}</PDFRootLayout>;
+}
@@ -0,0 +1,20 @@
+import { PDFPage, generatePDFMetadata } from '@/components/PDF';
+import { type RouteLayoutParams, getDynamicSiteContext } from '@v2/app/utils';
+
+export async function generateMetadata({
+    params,
+}: {
+    params: Promise<RouteLayoutParams>;
+}) {
+    const context = await getDynamicSiteContext(await params);
+    return generatePDFMetadata(context);
+}
+
+export default async function Page(props: {
+    params: Promise<RouteLayoutParams>;
+    searchParams: Promise<{ [key: string]: string }>;
+}) {
+    const { params, searchParams } = props;
+    const context = await getDynamicSiteContext(await params);
+    return <PDFPage context={context} searchParams={await searchParams} />;
+}
@@ -0,0 +1,5 @@
+import { SitePageNotFound } from '@/components/SitePage';
+
+export default async function NotFound() {
+    return <SitePageNotFound />;
+}
@@ -0,0 +1,48 @@
+import {
+    SitePage,
+    generateSitePageMetadata,
+    generateSitePageViewport,
+} from '@/components/SitePage';
+import { getCacheTag } from '@gitbook/cache-tags';
+import { type RouteParams, getPagePathFromParams, getStaticSiteContext } from '@v2/app/utils';
+import type { Metadata, Viewport } from 'next';
+import { unstable_cacheTag as cacheTag } from 'next/cache';
+
+export const dynamic = 'force-static';
+
+type PageProps = {
+    params: Promise<RouteParams>;
+};
+
+export default async function Page(props: PageProps) {
+    'use cache';
+
+    const params = await props.params;
+    const context = await getStaticSiteContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    cacheTag(
+        getCacheTag({
+            tag: 'site',
+            site: context.site.id,
+        })
+    );
+
+    return <SitePage context={context} pageParams={{ pathname }} />;
+}
+
+export async function generateViewport(props: PageProps): Promise<Viewport> {
+    const context = await getStaticSiteContext(await props.params);
+    return generateSitePageViewport(context);
+}
+
+export async function generateMetadata(props: PageProps): Promise<Metadata> {
+    const params = await props.params;
+    const context = await getStaticSiteContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    return generateSitePageMetadata({
+        context,
+        pageParams: { pathname },
+    });
+}
@@ -0,0 +1,52 @@
+import { CustomizationRootLayout } from '@/components/RootLayout';
+import {
+    SiteLayout,
+    generateSiteLayoutMetadata,
+    generateSiteLayoutViewport,
+} from '@/components/SiteLayout';
+import { getCacheTag } from '@gitbook/cache-tags';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+import { GITBOOK_DISABLE_TRACKING } from '@v2/lib/env';
+import { unstable_cacheTag as cacheTag } from 'next/cache';
+
+interface SiteStaticLayoutProps {
+    params: Promise<RouteLayoutParams>;
+}
+
+export default async function SiteStaticLayout({
+    params,
+    children,
+}: React.PropsWithChildren<SiteStaticLayoutProps>) {
+    'use cache';
+
+    const context = await getStaticSiteContext(await params);
+
+    cacheTag(
+        getCacheTag({
+            tag: 'site',
+            site: context.site.id,
+        })
+    );
+
+    return (
+        <CustomizationRootLayout customization={context.customization}>
+            <SiteLayout
+                context={context}
+                withTracking={!GITBOOK_DISABLE_TRACKING}
+                visitorAuthToken={null}
+            >
+                {children}
+            </SiteLayout>
+        </CustomizationRootLayout>
+    );
+}
+
+export async function generateViewport({ params }: SiteStaticLayoutProps) {
+    const context = await getStaticSiteContext(await params);
+    return generateSiteLayoutViewport(context);
+}
+
+export async function generateMetadata({ params }: SiteStaticLayoutProps) {
+    const context = await getStaticSiteContext(await params);
+    return generateSiteLayoutMetadata(context);
+}
@@ -0,0 +1,14 @@
+import type { NextRequest } from 'next/server';
+
+import { serveLLMsTxt } from '@/routes/llms';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return serveLLMsTxt(context);
+}
@@ -0,0 +1,14 @@
+import type { NextRequest } from 'next/server';
+
+import { serveRobotsTxt } from '@/routes/robots';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return serveRobotsTxt(context);
+}
@@ -0,0 +1,14 @@
+import type { NextRequest } from 'next/server';
+
+import { servePagesSitemap } from '@/routes/sitemap';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return servePagesSitemap(context);
+}
@@ -0,0 +1,14 @@
+import type { NextRequest } from 'next/server';
+
+import { serveRootSitemap } from '@/routes/sitemap';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return serveRootSitemap(context);
+}
@@ -0,0 +1,14 @@
+import type { NextRequest } from 'next/server';
+
+import { serveIcon } from '@/routes/icon';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return serveIcon(context, request);
+}
@@ -0,0 +1,15 @@
+import type { NextRequest } from 'next/server';
+
+import type { PageIdParams } from '@/components/SitePage';
+import { serveOGImage } from '@/routes/ogimage';
+import { type RouteLayoutParams, getStaticSiteContext } from '@v2/app/utils';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams & PageIdParams> }
+) {
+    const context = await getStaticSiteContext(await params);
+    return serveOGImage(context, await params);
+}
@@ -0,0 +1,76 @@
+import {
+    fetchSiteContextByURL,
+    fetchSiteContextByURLLookup,
+    getBaseContext,
+} from '@v2/lib/context';
+import { getSiteURLDataFromMiddleware } from '@v2/lib/middleware';
+
+export type RouteParamMode = 'url-host' | 'url';
+
+export type RouteLayoutParams = {
+    mode: string;
+
+    /** URL encoded site URL */
+    siteURL: string;
+};
+
+export type RouteParams = RouteLayoutParams & {
+    pagePath: string;
+};
+
+/**
+ * Get the static context when rendering statically a site.
+ */
+export function getStaticSiteContext(params: RouteLayoutParams) {
+    const siteURL = getSiteURLFromParams(params);
+    return fetchSiteContextByURL(
+        getBaseContext({
+            siteURL,
+            urlMode: getModeFromParams(params.mode),
+        }),
+        {
+            url: siteURL.toString(),
+            visitorAuthToken: null,
+            redirectOnError: false,
+        }
+    );
+}
+
+/**
+ * Get the site context when rendering dynamically.
+ * The context will depend on the request.
+ */
+export async function getDynamicSiteContext(params: RouteLayoutParams) {
+    const siteURL = getSiteURLFromParams(params);
+    const siteURLData = await getSiteURLDataFromMiddleware();
+
+    return fetchSiteContextByURLLookup(
+        getBaseContext({
+            siteURL,
+            urlMode: getModeFromParams(params.mode),
+        }),
+        siteURLData
+    );
+}
+
+/**
+ * Get the decoded page path from the params.
+ */
+export function getPagePathFromParams(params: RouteParams) {
+    const decoded = decodeURIComponent(params.pagePath);
+    return decoded;
+}
+
+function getSiteURLFromParams(params: RouteLayoutParams) {
+    const decoded = decodeURIComponent(params.siteURL);
+    const url = new URL(`https://${decoded}`);
+    return url;
+}
+
+function getModeFromParams(mode: string): RouteParamMode {
+    if (mode === 'url-host') {
+        return 'url-host';
+    }
+
+    return 'url';
+}
@@ -0,0 +1,38 @@
+import { type NextRequest, NextResponse } from 'next/server';
+
+import {
+    GITBOOK_API_PUBLIC_URL,
+    GITBOOK_API_TOKEN,
+    GITBOOK_API_URL,
+    GITBOOK_APP_URL,
+    GITBOOK_ASSETS_URL,
+    GITBOOK_DISABLE_TRACKING,
+    GITBOOK_ICONS_URL,
+    GITBOOK_IMAGE_RESIZE_SIGNING_KEY,
+    GITBOOK_INTEGRATIONS_HOST,
+    GITBOOK_SECRET,
+    GITBOOK_URL,
+    GITBOOK_USER_AGENT,
+} from '@v2/lib/env';
+
+/**
+ * Output the public environment variables for this deployment
+ */
+export async function GET(_req: NextRequest) {
+    return NextResponse.json({
+        GITBOOK_URL,
+        GITBOOK_APP_URL,
+        GITBOOK_API_URL,
+        GITBOOK_API_PUBLIC_URL,
+        GITBOOK_ASSETS_URL,
+        GITBOOK_ICONS_URL,
+        GITBOOK_USER_AGENT,
+        GITBOOK_INTEGRATIONS_HOST,
+        GITBOOK_DISABLE_TRACKING,
+
+        // Secret envs
+        GITBOOK_SECRET: !!GITBOOK_SECRET,
+        GITBOOK_API_TOKEN: !!GITBOOK_API_TOKEN,
+        GITBOOK_IMAGE_RESIZE_SIGNING_KEY: !!GITBOOK_IMAGE_RESIZE_SIGNING_KEY,
+    });
+}
@@ -0,0 +1,35 @@
+import { type NextRequest, NextResponse } from 'next/server';
+
+import { withVerifySignature } from '@v2/lib/routes';
+import { revalidateTag } from 'next/cache';
+
+interface JsonBody {
+    tags: string[];
+}
+
+/**
+ * Revalidate cached data based on tags.
+ * The body should be a JSON with { tags: string[] }
+ */
+export async function POST(req: NextRequest) {
+    return withVerifySignature<JsonBody>(req, async (body) => {
+        if (!body.tags || !Array.isArray(body.tags)) {
+            return NextResponse.json(
+                {
+                    error: 'tags must be an array',
+                },
+                { status: 400 }
+            );
+        }
+
+        body.tags.forEach((tag) => {
+            // biome-ignore lint/suspicious/noConsole: we want to log here
+            console.log(`Revalidating tag: ${tag}`);
+            revalidateTag(tag);
+        });
+
+        return NextResponse.json({
+            success: true,
+        });
+    });
+}
@@ -0,0 +1,57 @@
+import {
+    type GitBookBaseContext,
+    type GitBookSpaceContext,
+    fetchSpaceContextByIds,
+} from '@v2/lib/context';
+import { createDataFetcher } from '@v2/lib/data';
+import { createLinker } from '@v2/lib/links';
+import { getAPITokenFromMiddleware } from '@v2/lib/middleware';
+
+export type SpacePDFRouteParams = {
+    spaceId: string;
+    changeRequestId?: string;
+    revisionId?: string;
+};
+
+export async function getSpacePDFContext(
+    params: SpacePDFRouteParams
+): Promise<GitBookSpaceContext> {
+    const { spaceId } = params;
+
+    const apiToken = await getAPITokenFromMiddleware();
+
+    const linker = createLinker({
+        pathname: getPDFRoutePath(params),
+    });
+    const dataFetcher = createDataFetcher({
+        apiToken: apiToken,
+    });
+
+    const baseContext: GitBookBaseContext = {
+        linker,
+        dataFetcher,
+    };
+
+    return await fetchSpaceContextByIds(baseContext, {
+        space: spaceId,
+        shareKey: undefined,
+        changeRequest: params.changeRequestId,
+        revision: params.revisionId,
+    });
+}
+
+function getPDFRoutePath(params: SpacePDFRouteParams) {
+    let path = `/~space/${params.spaceId}`;
+
+    if (params.changeRequestId) {
+        path += `/~/changes/${params.changeRequestId}`;
+    }
+
+    if (params.revisionId) {
+        path += `/~/revisions/${params.revisionId}`;
+    }
+
+    path += '~gitbook/pdf';
+
+    return path;
+}
@@ -0,0 +1,2 @@
+import RootLayout from '@v2/app/~space/[spaceId]/~gitbook/pdf/layout';
+export default RootLayout;
@@ -0,0 +1,4 @@
+import PDFPage, { generateMetadata } from '@v2/app/~space/[spaceId]/~gitbook/pdf/page';
+
+export default PDFPage;
+export { generateMetadata };
@@ -0,0 +1,2 @@
+import RootLayout from '@v2/app/~space/[spaceId]/~gitbook/pdf/layout';
+export default RootLayout;
@@ -0,0 +1,4 @@
+import PDFPage, { generateMetadata } from '@v2/app/~space/[spaceId]/~gitbook/pdf/page';
+
+export default PDFPage;
+export { generateMetadata };
@@ -0,0 +1,12 @@
+import { PDFRootLayout } from '@/components/PDF';
+import { type SpacePDFRouteParams, getSpacePDFContext } from '@v2/app/~space/[spaceId]/pdf';
+
+export default async function RootLayout(props: {
+    params: Promise<SpacePDFRouteParams>;
+    children: React.ReactNode;
+}) {
+    const { params, children } = props;
+    const context = await getSpacePDFContext(await params);
+
+    return <PDFRootLayout context={context}>{children}</PDFRootLayout>;
+}
@@ -0,0 +1,20 @@
+import { PDFPage, generatePDFMetadata } from '@/components/PDF';
+import { type SpacePDFRouteParams, getSpacePDFContext } from '@v2/app/~space/[spaceId]/pdf';
+
+export async function generateMetadata({
+    params,
+}: {
+    params: Promise<SpacePDFRouteParams>;
+}) {
+    const context = await getSpacePDFContext(await params);
+    return generatePDFMetadata(context);
+}
+
+export default async function Page(props: {
+    params: Promise<SpacePDFRouteParams>;
+    searchParams: Promise<{ [key: string]: string }>;
+}) {
+    const { params, searchParams } = props;
+    const context = await getSpacePDFContext(await params);
+    return <PDFPage context={context} searchParams={await searchParams} />;
+}
@@ -0,0 +1,399 @@
+import { getSiteStructureSections } from '@/lib/sites';
+import type {
+    ChangeRequest,
+    PublishedSiteContentLookup,
+    RevisionPage,
+    RevisionPageDocument,
+    Site,
+    SiteCustomizationSettings,
+    SiteIntegrationScript,
+    SiteSection,
+    SiteSectionGroup,
+    SiteSpace,
+    SiteStructure,
+    Space,
+} from '@gitbook/api';
+import { type GitBookDataFetcher, createDataFetcher, throwIfDataError } from '@v2/lib/data';
+import { redirect } from 'next/navigation';
+import { assert } from 'ts-essentials';
+import { GITBOOK_URL } from './env';
+import { type ImageResizer, createImageResizer } from './images';
+import { type GitBookSpaceLinker, createLinker } from './links';
+
+/**
+ * Generic context when rendering content.
+ */
+export type GitBookBaseContext = {
+    /**
+     * Data fetcher to fetch data from GitBook.
+     */
+    dataFetcher: GitBookDataFetcher;
+
+    /**
+     * Linker to generate links in the current space.
+     */
+    linker: GitBookSpaceLinker;
+
+    /**
+     * Image resizer to resize images.
+     */
+    imageResizer?: ImageResizer;
+};
+
+/**
+ * Any context when rendering content.
+ */
+export type GitBookAnyContext = GitBookSpaceContext | GitBookSiteContext | GitBookPageContext;
+
+/**
+ * Context when rendering a space content.
+ */
+export type GitBookSpaceContext = GitBookBaseContext & {
+    organizationId: string;
+
+    space: Space;
+    changeRequest: ChangeRequest | null;
+
+    /** ID of the current revision. */
+    revisionId: string;
+
+    /** Pages of the space. */
+    pages: RevisionPage[];
+
+    /** Share key of the space. */
+    shareKey: string | undefined;
+};
+
+export type SiteSections = {
+    list: (SiteSectionGroup | SiteSection)[];
+    current: SiteSection;
+};
+
+/**
+ * Context when rendering a site.
+ */
+export type GitBookSiteContext = GitBookSpaceContext & {
+    site: Site;
+
+    /** Current site space. */
+    siteSpace: SiteSpace;
+
+    /** All site spaces in the current section / or entire site */
+    siteSpaces: SiteSpace[];
+
+    /** Sections of the site. */
+    sections: null | SiteSections;
+
+    /** Customizations of the site. */
+    customization: SiteCustomizationSettings;
+
+    /** Structure of the site. */
+    structure: SiteStructure;
+
+    /** Scripts to load for the site. */
+    scripts: SiteIntegrationScript[];
+};
+
+/**
+ * Context when rendering a page.
+ */
+export type GitBookPageContext = (GitBookSpaceContext | GitBookSiteContext) & {
+    page: RevisionPageDocument;
+};
+
+/**
+ * Get the base context for a request.
+ */
+export function getBaseContext(input: {
+    siteURL: URL | string;
+    urlMode: 'url' | 'url-host';
+    apiToken?: string | null;
+}) {
+    const url = typeof input.siteURL === 'string' ? new URL(input.siteURL) : input.siteURL;
+    const urlMode = input.urlMode;
+
+    const dataFetcher = createDataFetcher({
+        apiToken: input.apiToken ?? null,
+    });
+
+    const linker = getLinkerForSiteURL({
+        siteURL: url,
+        urlMode,
+    });
+
+    const imageResizer = createImageResizer({
+        host: url.host,
+        // To ensure image resizing work for proxied sites,
+        // we serve images from the root of the site.
+        linker: linker,
+    });
+
+    return {
+        dataFetcher,
+        linker,
+        imageResizer,
+    };
+}
+
+/**
+ * Get the linker for a given site URL.
+ */
+export function getLinkerForSiteURL(input: {
+    siteURL: URL;
+    urlMode: 'url' | 'url-host';
+}) {
+    const { siteURL, urlMode } = input;
+
+    const gitbookURL = GITBOOK_URL ? new URL(GITBOOK_URL) : undefined;
+    const linker =
+        urlMode === 'url-host'
+            ? createLinker({
+                  host: siteURL.host,
+                  pathname: siteURL.pathname,
+              })
+            : createLinker({
+                  protocol: gitbookURL?.protocol,
+                  host: gitbookURL?.host,
+                  pathname: `/url/${siteURL.host}${siteURL.pathname}`,
+              });
+
+    if (urlMode === 'url') {
+        // Create link in the same format for links to other sites/sections.
+        linker.toLinkForContent = (rawURL: string) => {
+            const urlObject = new URL(rawURL);
+            return `/url/${urlObject.host}${urlObject.pathname}${urlObject.search}`;
+        };
+    }
+
+    return linker;
+}
+
+/**
+ * Fetch the context of a site for a given URL and a base context.
+ */
+export async function fetchSiteContextByURL(
+    baseContext: GitBookBaseContext,
+    input: {
+        url: string;
+        visitorAuthToken: string | null;
+        redirectOnError: boolean;
+    }
+): Promise<GitBookSiteContext> {
+    const { dataFetcher } = baseContext;
+    const data = await throwIfDataError(
+        dataFetcher.getPublishedContentByUrl({
+            url: input.url,
+            visitorAuthToken: input.visitorAuthToken,
+            redirectOnError: input.redirectOnError,
+        })
+    );
+
+    return fetchSiteContextByURLLookup(baseContext, data);
+}
+
+/**
+ * Fetch the context of a site using the resolution of a URL
+ */
+export async function fetchSiteContextByURLLookup(
+    baseContext: GitBookBaseContext,
+    data: PublishedSiteContentLookup
+): Promise<GitBookSiteContext> {
+    const { dataFetcher } = baseContext;
+    if ('redirect' in data) {
+        redirect(data.redirect);
+    }
+
+    return await fetchSiteContextByIds(
+        {
+            ...baseContext,
+            dataFetcher: dataFetcher.withToken({
+                apiToken: data.apiToken,
+            }),
+        },
+        {
+            organization: data.organization,
+            site: data.site,
+            siteSection: data.siteSection,
+            siteSpace: data.siteSpace,
+            space: data.space,
+            shareKey: data.shareKey,
+            changeRequest: data.changeRequest,
+            revision: data.revision,
+        }
+    );
+}
+
+/**
+ * Fetch a site context by IDs.
+ */
+export async function fetchSiteContextByIds(
+    baseContext: GitBookBaseContext,
+    ids: {
+        organization: string;
+        site: string;
+        siteSection: string | undefined;
+        siteSpace: string | undefined;
+        space: string;
+        shareKey: string | undefined;
+        changeRequest: string | undefined;
+        revision: string | undefined;
+    }
+): Promise<GitBookSiteContext> {
+    const { dataFetcher } = baseContext;
+
+    const [{ site: orgSite, structure: siteStructure, customizations, scripts }, spaceContext] =
+        await Promise.all([
+            throwIfDataError(
+                dataFetcher.getPublishedContentSite({
+                    organizationId: ids.organization,
+                    siteId: ids.site,
+                    siteShareKey: ids.shareKey,
+                })
+            ),
+            fetchSpaceContextByIds(baseContext, ids),
+        ]);
+
+    // override the title with the customization title
+    // TODO: remove this hack once we have a proper way to handle site customizations
+    const site = {
+        ...orgSite,
+        ...(customizations.site?.title ? { title: customizations.site.title } : {}),
+    };
+
+    const sections = ids.siteSection
+        ? parseSiteSectionsAndGroups(siteStructure, ids.siteSection)
+        : null;
+
+    const siteSpace = (
+        siteStructure.type === 'siteSpaces' && siteStructure.structure
+            ? siteStructure.structure
+            : sections?.current.siteSpaces
+    )?.find((siteSpace) => siteSpace.id === ids.siteSpace);
+    if (!siteSpace) {
+        throw new Error('Site space not found');
+    }
+
+    const siteSpaces =
+        siteStructure.type === 'siteSpaces'
+            ? siteStructure.structure
+            : (sections?.current.siteSpaces ?? []);
+
+    const customization = (() => {
+        if (ids.siteSpace) {
+            const siteSpaceSettings = customizations.siteSpaces[ids.siteSpace];
+            if (siteSpaceSettings) {
+                return siteSpaceSettings;
+            }
+
+            // We got the pointer from an API and customizations from another.
+            // It's possible that the two are unsynced leading to not found customizations for the space.
+            // It's better to fallback on customization of the site that displaying an error.
+            console.warn('Customization not found for site space', ids.siteSpace);
+        }
+
+        return customizations.site;
+    })();
+
+    return {
+        ...spaceContext,
+        organizationId: ids.organization,
+        site,
+        siteSpaces,
+        siteSpace,
+        customization,
+        structure: siteStructure,
+        sections,
+        scripts,
+    };
+}
+
+/**
+ * Fetch a space context by IDs.
+ */
+export async function fetchSpaceContextByIds(
+    baseContext: GitBookBaseContext,
+    ids: {
+        space: string;
+        shareKey: string | undefined;
+        changeRequest: string | undefined;
+        revision: string | undefined;
+    }
+): Promise<GitBookSpaceContext> {
+    const { dataFetcher } = baseContext;
+
+    const [space, changeRequest] = await Promise.all([
+        throwIfDataError(
+            dataFetcher.getSpace({
+                spaceId: ids.space,
+                shareKey: ids.shareKey,
+            })
+        ),
+        ids.changeRequest
+            ? throwIfDataError(
+                  dataFetcher.getChangeRequest({
+                      spaceId: ids.space,
+                      changeRequestId: ids.changeRequest,
+                  })
+              )
+            : null,
+    ]);
+
+    const revisionId = changeRequest?.revision ?? ids.revision ?? space.revision;
+
+    const pages = await throwIfDataError(
+        dataFetcher.getRevisionPages({
+            spaceId: ids.space,
+            revisionId,
+            // We only care about the Git metadata when the Git sync is enabled,
+            // otherwise we can optimize performance by not fetching it
+            metadata: !!space.gitSync,
+        })
+    );
+
+    return {
+        ...baseContext,
+        organizationId: space.organization,
+        space,
+        pages,
+        changeRequest,
+        revisionId,
+        shareKey: ids.shareKey,
+    };
+}
+
+/**
+ * Check if the context is the root one for a site.
+ * Meaning we are on the default section / space.
+ */
+export function checkIsRootSiteContext(context: GitBookSiteContext): boolean {
+    const { structure } = context;
+    switch (structure.type) {
+        case 'sections': {
+            return getSiteStructureSections(structure, { ignoreGroups: true }).some(
+                (structure) =>
+                    structure.default &&
+                    structure.id === context.sections?.current.id &&
+                    structure.siteSpaces.some(
+                        (siteSpace) => siteSpace.default && siteSpace.id === context.siteSpace.id
+                    )
+            );
+        }
+        case 'siteSpaces': {
+            return structure.structure.some(
+                (siteSpace) => siteSpace.default && siteSpace.id === context.siteSpace.id
+            );
+        }
+    }
+}
+
+function parseSiteSectionsAndGroups(structure: SiteStructure, siteSectionId: string) {
+    const sectionsAndGroups = getSiteStructureSections(structure, { ignoreGroups: false });
+    const section = parseCurrentSection(structure, siteSectionId);
+    assert(section, 'A section must be defined when there are multiple sections');
+    return { list: sectionsAndGroups, current: section } satisfies SiteSections;
+}
+
+function parseCurrentSection(structure: SiteStructure, siteSectionId: string) {
+    const sections = getSiteStructureSections(structure, { ignoreGroups: true });
+    return sections.find((section) => section.id === siteSectionId);
+}
@@ -0,0 +1,610 @@
+import { trace } from '@/lib/tracing';
+import {
+    type ComputedContentSource,
+    GitBookAPI,
+    type GitBookAPIServiceBinding,
+} from '@gitbook/api';
+import {
+    getCacheTag,
+    getCacheTagForURL,
+    getComputedContentSourceCacheTags,
+} from '@gitbook/cache-tags';
+import { GITBOOK_API_TOKEN, GITBOOK_API_URL, GITBOOK_USER_AGENT } from '@v2/lib/env';
+import { unstable_cacheLife as cacheLife, unstable_cacheTag as cacheTag } from 'next/cache';
+import { wrapDataFetcherError } from './errors';
+import type { GitBookDataFetcher } from './types';
+
+interface DataFetcherInput {
+    /**
+     * API token.
+     */
+    apiToken: string | null;
+}
+
+/**
+ * Create a data fetcher using an API token.
+ * The data are being cached by Next.js built-in cache.
+ */
+export function createDataFetcher(
+    input: DataFetcherInput = { apiToken: null }
+): GitBookDataFetcher {
+    return {
+        async api() {
+            return apiClient(input);
+        },
+
+        withToken({ apiToken }) {
+            return createDataFetcher({
+                apiToken,
+            });
+        },
+
+        //
+        // API that are tied to the token
+        //
+        getPublishedContentSite(params) {
+            return trace('getPublishedContentSite', () =>
+                getPublishedContentSite(input, {
+                    organizationId: params.organizationId,
+                    siteId: params.siteId,
+                    siteShareKey: params.siteShareKey,
+                })
+            );
+        },
+        getSiteRedirectBySource(params) {
+            return trace('getSiteRedirectBySource', () =>
+                getSiteRedirectBySource(input, {
+                    organizationId: params.organizationId,
+                    siteId: params.siteId,
+                    siteShareKey: params.siteShareKey,
+                    source: params.source,
+                })
+            );
+        },
+        getRevision(params) {
+            return trace('getRevision', () =>
+                getRevision(input, {
+                    spaceId: params.spaceId,
+                    revisionId: params.revisionId,
+                    metadata: params.metadata,
+                })
+            );
+        },
+        getRevisionPages(params) {
+            return trace('getRevisionPages', () =>
+                getRevisionPages(input, {
+                    spaceId: params.spaceId,
+                    revisionId: params.revisionId,
+                    metadata: params.metadata,
+                })
+            );
+        },
+        getRevisionFile(params) {
+            return trace('getRevisionFile', () =>
+                getRevisionFile(input, {
+                    spaceId: params.spaceId,
+                    revisionId: params.revisionId,
+                    fileId: params.fileId,
+                })
+            );
+        },
+        getRevisionPageByPath(params) {
+            return trace('getRevisionPageByPath', () =>
+                getRevisionPageByPath(input, {
+                    spaceId: params.spaceId,
+                    revisionId: params.revisionId,
+                    path: params.path,
+                })
+            );
+        },
+        getReusableContent(params) {
+            return trace('getReusableContent', () =>
+                getReusableContent(input, {
+                    spaceId: params.spaceId,
+                    revisionId: params.revisionId,
+                    reusableContentId: params.reusableContentId,
+                })
+            );
+        },
+        getLatestOpenAPISpecVersionContent(params) {
+            return trace('getLatestOpenAPISpecVersionContent', () =>
+                getLatestOpenAPISpecVersionContent(input, {
+                    organizationId: params.organizationId,
+                    slug: params.slug,
+                })
+            );
+        },
+        getSpace(params) {
+            return trace('getSpace', () =>
+                getSpace(input, {
+                    spaceId: params.spaceId,
+                    shareKey: params.shareKey,
+                })
+            );
+        },
+        getChangeRequest(params) {
+            return trace('getChangeRequest', () =>
+                getChangeRequest(input, {
+                    spaceId: params.spaceId,
+                    changeRequestId: params.changeRequestId,
+                })
+            );
+        },
+        getDocument(params) {
+            return trace('getDocument', () =>
+                getDocument(input, {
+                    spaceId: params.spaceId,
+                    documentId: params.documentId,
+                })
+            );
+        },
+        getComputedDocument(params) {
+            return trace('getComputedDocument', () =>
+                getComputedDocument(input, {
+                    organizationId: params.organizationId,
+                    spaceId: params.spaceId,
+                    source: params.source,
+                })
+            );
+        },
+        getEmbedByUrl(params) {
+            return trace('getEmbedByUrl', () =>
+                getEmbedByUrl(input, {
+                    url: params.url,
+                    spaceId: params.spaceId,
+                })
+            );
+        },
+        searchSiteContent(params) {
+            return trace('searchSiteContent', () => searchSiteContent(input, params));
+        },
+
+        //
+        // API that are not tied to the token
+        // where the data is the same for all users
+        //
+        getUserById(userId) {
+            return trace('getUserById', () => getUserById({ apiToken: null }, { userId }));
+        },
+        getPublishedContentByUrl(params) {
+            return trace('getPublishedContentByUrl', () =>
+                getPublishedContentByUrl(
+                    { apiToken: null },
+                    {
+                        url: params.url,
+                        visitorAuthToken: params.visitorAuthToken,
+                        redirectOnError: params.redirectOnError,
+                    }
+                )
+            );
+        },
+    };
+}
+
+async function getUserById(input: DataFetcherInput, params: { userId: string }) {
+    'use cache';
+
+    cacheLife('days');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.users.getUserById(params.userId);
+        return res.data;
+    });
+}
+
+async function getSpace(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        shareKey: string | undefined;
+    }
+) {
+    'use cache';
+
+    cacheLife('days');
+    cacheTag(
+        getCacheTag({
+            tag: 'space',
+            space: params.spaceId,
+        })
+    );
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getSpaceById(params.spaceId, {
+            shareKey: params.shareKey,
+        });
+        return res.data;
+    });
+}
+
+async function getChangeRequest(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        changeRequestId: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('minutes');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getChangeRequestById(params.spaceId, params.changeRequestId);
+        cacheTag(
+            getCacheTag({
+                tag: 'change-request',
+                space: params.spaceId,
+                changeRequest: res.data.id,
+            })
+        );
+        return res.data;
+    });
+}
+
+async function getRevision(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        revisionId: string;
+        metadata: boolean;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getRevisionById(params.spaceId, params.revisionId, {
+            metadata: params.metadata,
+        });
+        return res.data;
+    });
+}
+
+async function getRevisionPages(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        revisionId: string;
+        metadata: boolean;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.listPagesInRevisionById(params.spaceId, params.revisionId, {
+            metadata: params.metadata,
+        });
+        return res.data.pages;
+    });
+}
+
+async function getRevisionFile(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        revisionId: string;
+        fileId: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getFileInRevisionById(
+            params.spaceId,
+            params.revisionId,
+            params.fileId,
+            {}
+        );
+        return res.data;
+    });
+}
+
+async function getRevisionPageByPath(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        revisionId: string;
+        path: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    const encodedPath = encodeURIComponent(params.path);
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getPageInRevisionByPath(
+            params.spaceId,
+            params.revisionId,
+            encodedPath,
+            {}
+        );
+
+        return res.data;
+    });
+}
+
+async function getDocument(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        documentId: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getDocumentById(params.spaceId, params.documentId, {});
+        return res.data;
+    });
+}
+
+async function getComputedDocument(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        organizationId: string;
+        source: ComputedContentSource;
+    }
+) {
+    'use cache';
+
+    cacheLife('days');
+
+    cacheTag(
+        ...getComputedContentSourceCacheTags(
+            {
+                spaceId: params.spaceId,
+                organizationId: params.organizationId,
+            },
+            params.source
+        )
+    );
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getComputedDocument(params.spaceId, {
+            source: params.source,
+        });
+        return res.data;
+    });
+}
+
+async function getReusableContent(
+    input: DataFetcherInput,
+    params: {
+        spaceId: string;
+        revisionId: string;
+        reusableContentId: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('max');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getReusableContentInRevisionById(
+            params.spaceId,
+            params.revisionId,
+            params.reusableContentId
+        );
+        return res.data;
+    });
+}
+
+async function getLatestOpenAPISpecVersionContent(
+    input: DataFetcherInput,
+    params: {
+        organizationId: string;
+        slug: string;
+    }
+) {
+    'use cache';
+
+    cacheTag(
+        getCacheTag({
+            tag: 'openapi',
+            organization: params.organizationId,
+            openAPISpec: params.slug,
+        })
+    );
+    cacheLife('days');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.orgs.getLatestOpenApiSpecVersionContent(
+            params.organizationId,
+            params.slug
+        );
+        return res.data;
+    });
+}
+
+async function getPublishedContentByUrl(
+    input: DataFetcherInput,
+    params: {
+        url: string;
+        visitorAuthToken: string | null;
+        redirectOnError: boolean;
+    }
+) {
+    'use cache';
+
+    const { url, visitorAuthToken, redirectOnError } = params;
+
+    cacheTag(getCacheTagForURL(url));
+    cacheLife('days');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.urls.getPublishedContentByUrl({
+            url,
+            visitorAuthToken: visitorAuthToken ?? undefined,
+            redirectOnError,
+        });
+
+        if ('site' in res.data) {
+            cacheTag(
+                getCacheTag({
+                    tag: 'site',
+                    site: res.data.site,
+                })
+            );
+        }
+
+        return res.data;
+    });
+}
+
+async function getPublishedContentSite(
+    input: DataFetcherInput,
+    params: {
+        organizationId: string;
+        siteId: string;
+        siteShareKey: string | undefined;
+    }
+) {
+    'use cache';
+
+    cacheLife('days');
+    cacheTag(
+        getCacheTag({
+            tag: 'site',
+            site: params.siteId,
+        })
+    );
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.orgs.getPublishedContentSite(params.organizationId, params.siteId, {
+            shareKey: params.siteShareKey,
+        });
+        return res.data;
+    });
+}
+
+async function getSiteRedirectBySource(
+    input: DataFetcherInput,
+    params: {
+        organizationId: string;
+        siteId: string;
+        siteShareKey: string | undefined;
+        source: string;
+    }
+) {
+    'use cache';
+
+    cacheTag(
+        getCacheTag({
+            tag: 'site',
+            site: params.siteId,
+        })
+    );
+    cacheLife('days');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.orgs.getSiteRedirectBySource(params.organizationId, params.siteId, {
+            shareKey: params.siteShareKey,
+            source: params.source,
+        });
+
+        return res.data;
+    });
+}
+
+async function getEmbedByUrl(
+    input: DataFetcherInput,
+    params: {
+        url: string;
+        spaceId: string;
+    }
+) {
+    'use cache';
+
+    cacheLife('weeks');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.spaces.getEmbedByUrlInSpace(params.spaceId, { url: params.url });
+        return res.data;
+    });
+}
+
+async function searchSiteContent(
+    input: DataFetcherInput,
+    params: Parameters<GitBookDataFetcher['searchSiteContent']>[0]
+) {
+    'use cache';
+
+    const { organizationId, siteId, query, scope } = params;
+
+    cacheLife('days');
+
+    return wrapDataFetcherError(async () => {
+        const api = await apiClient(input);
+        const res = await api.orgs.searchSiteContent(organizationId, siteId, {
+            query,
+            ...scope,
+        });
+        return res.data.items;
+    });
+}
+
+let loggedServiceBinding = false;
+
+/**
+ * Create a new API client.
+ */
+export async function apiClient(input: DataFetcherInput = { apiToken: null }) {
+    const { apiToken } = input;
+    let serviceBinding: GitBookAPIServiceBinding | undefined;
+
+    try {
+        // HACK: This is a workaround to avoid webpack trying to bundle this cloudflare only module
+        // @ts-ignore
+        const { env } = await import(
+            /* webpackIgnore: true */ `${'__cloudflare:workers'.replaceAll('_', '')}`
+        );
+        serviceBinding = env.GITBOOK_API;
+        if (!loggedServiceBinding) {
+            loggedServiceBinding = true;
+            if (serviceBinding) {
+                // biome-ignore lint/suspicious/noConsole: we want to log here
+                console.log(`using service binding for the API (${GITBOOK_API_URL})`);
+            } else {
+                // biome-ignore lint/suspicious/noConsole: we want to log here
+                console.warn(`no service binding for the API (${GITBOOK_API_URL})`);
+            }
+        }
+    } catch (error) {
+        if (process.env.NODE_ENV === 'production' && !process.env.VERCEL) {
+            throw error;
+        }
+    }
+
+    const api = new GitBookAPI({
+        authToken: apiToken || GITBOOK_API_TOKEN || undefined,
+        endpoint: GITBOOK_API_URL,
+        userAgent: GITBOOK_USER_AGENT,
+        serviceBinding,
+    });
+
+    return api;
+}
@@ -0,0 +1,115 @@
+import { GitBookAPIError } from '@gitbook/api';
+import type { DataFetcherErrorData, DataFetcherResponse } from './types';
+
+export class DataFetcherError extends Error {
+    constructor(
+        message: string,
+        public readonly code: number
+    ) {
+        super(message);
+    }
+}
+
+/**
+ * Throw an error if the response contains an error.
+ */
+export function throwIfDataError<T>(response: DataFetcherResponse<T>): T;
+export function throwIfDataError<T>(response: Promise<DataFetcherResponse<T>>): Promise<T>;
+export function throwIfDataError<T>(
+    response: DataFetcherResponse<T> | Promise<DataFetcherResponse<T>>
+): T | Promise<T> {
+    if (response instanceof Promise) {
+        return response.then((result) => throwIfDataError(result));
+    }
+
+    if (response.error) {
+        throw new DataFetcherError(response.error.message, response.error.code);
+    }
+    return response.data;
+}
+
+/**
+ * Get the data from the response or null if there is an "Not found" error.
+ */
+export function getDataOrNull<T>(
+    response: DataFetcherResponse<T>,
+    ignoreErrors?: number[]
+): T | null;
+export function getDataOrNull<T>(
+    response: Promise<DataFetcherResponse<T>>,
+    ignoreErrors?: number[]
+): Promise<T | null>;
+export function getDataOrNull<T>(
+    response: DataFetcherResponse<T> | Promise<DataFetcherResponse<T>>,
+    ignoreErrors: number[] = [404]
+): T | null | Promise<T | null> {
+    if (response instanceof Promise) {
+        return response.then((result) => getDataOrNull(result, ignoreErrors));
+    }
+
+    if (response.error) {
+        if (ignoreErrors.includes(response.error.code)) return null;
+        throw new DataFetcherError(response.error.message, response.error.code);
+    }
+    return response.data;
+}
+
+/**
+ * Ignore error for an API or data call.
+ */
+export async function ignoreDataThrownError<T>(promise: Promise<T>): Promise<T | null> {
+    try {
+        return await promise;
+    } catch (error) {
+        getExposableError(error as Error);
+        return null;
+    }
+}
+
+/**
+ * Ignore all errors for an API or data call.
+ */
+export async function ignoreAllThrownError<T>(promise: Promise<T>): Promise<T | null> {
+    try {
+        return await promise;
+    } catch (error) {
+        console.warn('Ignoring error', error);
+        return null;
+    }
+}
+
+/**
+ * Wrap an async execution to handle errors and return a DataFetcherResponse.
+ */
+export async function wrapDataFetcherError<T>(
+    fn: () => Promise<T>
+): Promise<DataFetcherResponse<T>> {
+    try {
+        return { data: await fn() };
+    } catch (error) {
+        return {
+            error: getExposableError(error as Error),
+        };
+    }
+}
+
+/**
+ * Get a data fetcher exposable error from a JS error.
+ */
+export function getExposableError(error: Error): DataFetcherErrorData {
+    if (error instanceof GitBookAPIError) {
+        return {
+            code: error.code,
+            message: error.errorMessage,
+        };
+    }
+
+    if (error instanceof DataFetcherError) {
+        return {
+            code: error.code,
+            message: error.message,
+        };
+    }
+
+    throw error;
+}
@@ -0,0 +1,6 @@
+export * from './api';
+export * from './types';
+export * from './pages';
+export * from './urls';
+export * from './errors';
+export * from './lookup';
@@ -0,0 +1,128 @@
+import { race, tryCatch } from '@/lib/async';
+import { joinPath } from '@/lib/paths';
+import { trace } from '@/lib/tracing';
+import type { PublishedSiteContentLookup } from '@gitbook/api';
+import { apiClient } from './api';
+import { getExposableError } from './errors';
+import type { DataFetcherResponse } from './types';
+import { getURLLookupAlternatives, stripURLSearch } from './urls';
+
+/**
+ * Lookup a content by its URL using the GitBook API.
+ * To optimize caching, we try multiple lookup alternatives and return the first one that matches.
+ */
+export async function getPublishedContentByURL(input: {
+    url: string;
+    visitorAuthToken: string | null;
+    redirectOnError: boolean;
+}): Promise<DataFetcherResponse<PublishedSiteContentLookup>> {
+    const lookupURL = new URL(input.url);
+    const url = stripURLSearch(lookupURL);
+    const lookup = getURLLookupAlternatives(url);
+
+    const result = await race(lookup.urls, async (alternative, { signal }) => {
+        const api = await apiClient();
+
+        const callResult = await trace(
+            {
+                operation: 'getPublishedContentByURL',
+                name: alternative.url,
+            },
+            () =>
+                tryCatch(
+                    api.urls.getPublishedContentByUrl(
+                        {
+                            url: alternative.url,
+                            visitorAuthToken: input.visitorAuthToken ?? undefined,
+                            redirectOnError: input.redirectOnError,
+                        },
+                        {
+                            signal,
+                        }
+                    )
+                )
+        );
+
+        if (callResult.error) {
+            if (alternative.primary) {
+                // We only return an error for the primary alternative (full URL),
+                // as other parts could result in errors due to the URL being incomplete (share links, etc).
+                return { error: callResult.error };
+            }
+            return null;
+        }
+
+        const {
+            data: { data },
+        } = callResult;
+
+        if ('redirect' in data) {
+            if (alternative.primary) {
+                // Append the path to the redirect URL
+                // because we might have matched a shorter path and the redirect is relative to it
+                if (alternative.extraPath) {
+                    if (data.target === 'content') {
+                        const redirect = new URL(data.redirect);
+                        redirect.pathname = joinPath(redirect.pathname, alternative.extraPath);
+                        data.redirect = redirect.toString();
+                    } else {
+                        const redirect = new URL(data.redirect);
+                        if (redirect.searchParams.has('location')) {
+                            redirect.searchParams.set(
+                                'location',
+                                joinPath(
+                                    redirect.searchParams.get('location') ?? '',
+                                    alternative.extraPath
+                                )
+                            );
+                            data.redirect = redirect.toString();
+                        }
+                    }
+                }
+
+                return { data };
+            }
+
+            return null;
+        }
+
+        /**
+         * We use the following criteria to determine if the lookup result is the right one:
+         * - the primary alternative was resolved (because that's the longest or most inclusive path)
+         * - the resolution of the site URL is complete (because we want to resolve the deepest path possible)
+         *
+         * In both cases, the idea is to use the deepest/longest/most inclusive path to resolve the content.
+         */
+        if (alternative.primary || ('site' in data && data.complete)) {
+            const siteResult: PublishedSiteContentLookup = {
+                ...data,
+                changeRequest: data.changeRequest ?? lookup.changeRequest,
+                revision: data.revision ?? lookup.revision,
+                basePath: joinPath(data.basePath, lookup.basePath ?? ''),
+                pathname: joinPath(data.pathname, alternative.extraPath),
+            };
+            return { data: siteResult };
+        }
+
+        return null;
+    });
+
+    if (!result) {
+        return {
+            error: {
+                code: 404,
+                message: 'No content found',
+            },
+        };
+    }
+
+    if (result.error) {
+        return {
+            error: getExposableError(result.error),
+        };
+    }
+
+    return {
+        data: result.data,
+    };
+}
@@ -0,0 +1,29 @@
+import type { JSONDocument, RevisionPageDocument, Space } from '@gitbook/api';
+import { getDataOrNull } from './errors';
+import type { GitBookDataFetcher } from './types';
+
+/**
+ * Get the document for a page.
+ */
+export async function getPageDocument(
+    dataFetcher: GitBookDataFetcher,
+    space: Space,
+    page: RevisionPageDocument
+): Promise<JSONDocument | null> {
+    if (page.documentId) {
+        return getDataOrNull(
+            dataFetcher.getDocument({ spaceId: space.id, documentId: page.documentId })
+        );
+    }
+    if (page.computed) {
+        return getDataOrNull(
+            dataFetcher.getComputedDocument({
+                organizationId: space.organization,
+                spaceId: space.id,
+                source: page.computed,
+            })
+        );
+    }
+
+    return null;
+}
@@ -0,0 +1,173 @@
+import type * as api from '@gitbook/api';
+
+export type DataFetcherErrorData = {
+    code: number;
+    message: string;
+};
+
+export type DataFetcherResponse<T> =
+    | {
+          data: T;
+          error?: undefined;
+      }
+    | {
+          error: DataFetcherErrorData;
+          data?: undefined;
+      };
+
+/**
+ * Generic fetcher for GitBook data.
+ * It is used between v1 and v2.
+ */
+export interface GitBookDataFetcher {
+    /**
+     * Get an API client for the current context.
+     */
+    api(): Promise<api.GitBookAPI>;
+
+    /**
+     * Create a data fetcher authenticated with a specific token.
+     */
+    withToken(input: {
+        apiToken: string;
+    }): GitBookDataFetcher;
+
+    /**
+     * Get a user by its ID.
+     */
+    getUserById(userId: string): Promise<DataFetcherResponse<api.User>>;
+
+    /**
+     * Get a published content by its URL.
+     */
+    getPublishedContentByUrl(params: {
+        url: string;
+        visitorAuthToken: string | null;
+        redirectOnError: boolean;
+    }): Promise<DataFetcherResponse<api.PublishedSiteContentLookup>>;
+
+    /**
+     * Get a published content site by its organization ID and site ID.
+     */
+    getPublishedContentSite(params: {
+        organizationId: string;
+        siteId: string;
+        siteShareKey: string | undefined;
+    }): Promise<DataFetcherResponse<api.PublishedContentSite>>;
+
+    /**
+     * Get a space by its ID.
+     */
+    getSpace(params: { spaceId: string; shareKey: string | undefined }): Promise<
+        DataFetcherResponse<api.Space>
+    >;
+
+    /**
+     * Get a change request by its space ID and change request ID.
+     */
+    getChangeRequest(params: {
+        spaceId: string;
+        changeRequestId: string;
+    }): Promise<DataFetcherResponse<api.ChangeRequest>>;
+
+    /**
+     * Get the revision by its space ID and revision ID.
+     */
+    getRevision(params: {
+        spaceId: string;
+        revisionId: string;
+        metadata: boolean;
+    }): Promise<DataFetcherResponse<api.Revision>>;
+
+    /**
+     * Get the revision pages by its space ID and revision ID.
+     */
+    getRevisionPages(params: {
+        spaceId: string;
+        revisionId: string;
+        metadata: boolean;
+    }): Promise<DataFetcherResponse<api.RevisionPage[]>>;
+
+    /**
+     * Get a revision file by its space ID, revision ID and file ID.
+     */
+    getRevisionFile(params: {
+        spaceId: string;
+        revisionId: string;
+        fileId: string;
+    }): Promise<DataFetcherResponse<api.RevisionFile>>;
+
+    /**
+     * Get a revision page by its path.
+     */
+    getRevisionPageByPath(params: {
+        spaceId: string;
+        revisionId: string;
+        path: string;
+    }): Promise<DataFetcherResponse<api.RevisionPageDocument | api.RevisionPageGroup>>;
+
+    /**
+     * Get a document by its space ID and document ID.
+     */
+    getDocument(params: { spaceId: string; documentId: string }): Promise<
+        DataFetcherResponse<api.JSONDocument>
+    >;
+
+    /**
+     * Get a computed document by its space ID and computed source.
+     */
+    getComputedDocument(params: {
+        organizationId: string;
+        spaceId: string;
+        source: api.ComputedContentSource;
+    }): Promise<DataFetcherResponse<api.JSONDocument>>;
+
+    /**
+     * Get a reusable content by its space ID, revision ID and reusable content ID.
+     */
+    getReusableContent(params: {
+        spaceId: string;
+        revisionId: string;
+        reusableContentId: string;
+    }): Promise<DataFetcherResponse<api.RevisionReusableContent>>;
+
+    /**
+     * Get the latest OpenAPI spec version content by its organization ID and slug.
+     */
+    getLatestOpenAPISpecVersionContent(params: {
+        organizationId: string;
+        slug: string;
+    }): Promise<DataFetcherResponse<api.OpenAPISpecContent>>;
+
+    /**
+     * Get a site redirect by its source path.
+     */
+    getSiteRedirectBySource(params: {
+        organizationId: string;
+        siteId: string;
+        siteShareKey: string | undefined;
+        source: string;
+    }): Promise<DataFetcherResponse<{ redirect: api.SiteRedirect | null; target: string }>>;
+
+    /**
+     * Get an embed by its URL.
+     */
+    getEmbedByUrl(params: { url: string; spaceId: string }): Promise<
+        DataFetcherResponse<api.Embed>
+    >;
+
+    /**
+     * Search content in a site.
+     */
+    searchSiteContent(params: {
+        organizationId: string;
+        siteId: string;
+        query: string;
+        scope:
+            | { mode: 'all' }
+            | { mode: 'current'; siteSpaceId: string }
+            | { mode: 'specific'; siteSpaceIds: string[] };
+        /** Cache bust to ensure the search results are fresh when the space is updated. */
+        cacheBust?: string;
+    }): Promise<DataFetcherResponse<api.SearchSpaceResult[]>>;
+}
@@ -1,6 +1,6 @@
-import { describe, it, expect } from 'bun:test';
+import { describe, expect, it } from 'bun:test';

-import { getURLLookupAlternatives, normalizeURL } from './middleware';
+import { getURLLookupAlternatives, normalizeURL } from './urls';

 describe('getURLLookupAlternatives', () => {
    it('should return all URLs up to the root', () => {
@@ -68,7 +68,7 @@ describe('getURLLookupAlternatives', () => {

    it('should not match before the variant for a variant url', () => {
        expect(
-            getURLLookupAlternatives(new URL('https://test.gitbook.io/v/variant/space')),
+            getURLLookupAlternatives(new URL('https://test.gitbook.io/v/variant/space'))
        ).toEqual({
            revision: undefined,
            changeRequest: undefined,
@@ -85,7 +85,7 @@ describe('getURLLookupAlternatives', () => {

    it('should not match before the variant for a variant in a share link', () => {
        expect(
-            getURLLookupAlternatives(new URL('https://test.gitbook.io/sharelink/v/variant/space')),
+            getURLLookupAlternatives(new URL('https://test.gitbook.io/sharelink/v/variant/space'))
        ).toEqual({
            revision: undefined,
            changeRequest: undefined,
@@ -103,8 +103,8 @@ describe('getURLLookupAlternatives', () => {
    it('should not match before a revision in a variant', () => {
        expect(
            getURLLookupAlternatives(
-                new URL('https://test.gitbook.io/v/variant/~/revisions/id/rest'),
-            ),
+                new URL('https://test.gitbook.io/v/variant/~/revisions/id/rest')
+            )
        ).toEqual({
            revision: 'id',
            changeRequest: undefined,
@@ -121,7 +121,7 @@ describe('getURLLookupAlternatives', () => {

    it('should not match before a revision ID', () => {
        expect(
-            getURLLookupAlternatives(new URL('https://docs.mycompany.com/~/revisions/id/a/b/c')),
+            getURLLookupAlternatives(new URL('https://docs.mycompany.com/~/revisions/id/a/b/c'))
        ).toEqual({
            revision: 'id',
            changeRequest: undefined,
@@ -138,7 +138,7 @@ describe('getURLLookupAlternatives', () => {

    it('should not match before a change request ID', () => {
        expect(
-            getURLLookupAlternatives(new URL('https://docs.mycompany.com/~/changes/id/hello')),
+            getURLLookupAlternatives(new URL('https://docs.mycompany.com/~/changes/id/hello'))
        ).toEqual({
            revision: undefined,
            changeRequest: 'id',
@@ -195,7 +195,7 @@ describe('getURLLookupAlternatives', () => {

    it('should match a variant in a share-link', () => {
        expect(
-            getURLLookupAlternatives(new URL('https://test.gitbook.io/sharelink/v/variant/space')),
+            getURLLookupAlternatives(new URL('https://test.gitbook.io/sharelink/v/variant/space'))
        ).toEqual({
            revision: undefined,
            changeRequest: undefined,
@@ -213,8 +213,8 @@ describe('getURLLookupAlternatives', () => {
    it('should match a revision in a variant in a share-link', () => {
        expect(
            getURLLookupAlternatives(
-                new URL('https://test.gitbook.io/sharelink/v/variant/~/revisions/id/a/b/c'),
-            ),
+                new URL('https://test.gitbook.io/sharelink/v/variant/~/revisions/id/a/b/c')
+            )
        ).toEqual({
            revision: 'id',
            changeRequest: undefined,
@@ -232,8 +232,8 @@ describe('getURLLookupAlternatives', () => {
    it('should match a change request in a variant in a share-link', () => {
        expect(
            getURLLookupAlternatives(
-                new URL('https://test.gitbook.io/sharelink/v/variant/~/changes/id/a/b/c'),
-            ),
+                new URL('https://test.gitbook.io/sharelink/v/variant/~/changes/id/a/b/c')
+            )
        ).toEqual({
            revision: undefined,
            changeRequest: 'id',
@@ -367,13 +367,13 @@ describe('getURLLookupAlternatives', () => {
 describe('normalizeURL', () => {
    it('should remove trailing slashes', () => {
        expect(normalizeURL(new URL('https://docs.mycompany.com/hello/'))).toEqual(
-            new URL('https://docs.mycompany.com/hello'),
+            new URL('https://docs.mycompany.com/hello')
        );
    });

    it('should remove duplicate slashes', () => {
        expect(normalizeURL(new URL('https://docs.mycompany.com//hello//there'))).toEqual(
-            new URL('https://docs.mycompany.com/hello/there'),
+            new URL('https://docs.mycompany.com/hello/there')
        );
    });
 });
@@ -0,0 +1,130 @@
+/**
+ * For a given GitBook URL, return a list of alternative URLs that could be matched against to lookup the content.
+ * The approach is optimized to aim at reusing cached lookup results as much as possible.
+ *
+ * The cases can be:
+ *
+ * Custom hostname
+ *   - Public content has a custom hostname: docs.company.com/<path>
+ *   - Public content has a custom hostname with a share-link: docs.company.com/<link>/<path>
+ *   - Public content has a custom hostname with a variant: docs.company.com/v/<variant>/<path>
+ *   - Public content has a custom hostname with a variant and a share-link: docs.company.com/<link>/v/<variant>/<path>
+ *   - Revisions in a custom hostname: docs.company.com/~/revisions/<id>/<path>
+ *   - Changes in a custom hostname: docs.company.com/~/changes/<id>/<path>
+ *
+ * Custom hostname in the organization or GitBook domain (company.gitbook.io)
+ *   - Public content has a custom hostname in the organization: docs.company.com/<space>/<path>
+ *   - Public content has a custom hostname in the organization with a share-link: docs.company.com/<space>/<link>/<path>
+ *   - Public content has a custom hostname in the organization with a variant: docs.company.com/<space>/v/<variant>/<path>
+ *   - Public content has a custom hostname in the organization with a variant and a share-link: docs.company.com/<space>/<link>/v/<variant>/<path>
+ */
+export function getURLLookupAlternatives(input: URL) {
+    const url = normalizeURL(input);
+
+    let basePath: string | undefined = undefined;
+    let changeRequest: string | undefined = undefined;
+    let revision: string | undefined = undefined;
+    const alternatives: Array<{ url: string; extraPath: string; primary: boolean }> = [];
+
+    const pushAlternative = (adding: URL, extraPath: string) => {
+        const existing = alternatives.find((alt) => alt.url === adding.toString());
+        if (existing) {
+            if (existing.extraPath !== extraPath) {
+                throw new Error(
+                    `Invalid extraPath ${extraPath} for url ${adding.toString()}, already set to ${
+                        existing.extraPath
+                    }`
+                );
+            }
+            return;
+        }
+
+        alternatives.push({
+            url: adding.toString(),
+            extraPath,
+            primary: adding.toString() === url.toString(),
+        });
+    };
+
+    const pathSegments = url.pathname.slice(1).split('/');
+    const tildeIndex = pathSegments.indexOf('~');
+
+    // URL looks like a specific content url (with ~/revisions/ or ~/changes/ in the path)
+    // We only start matching after the ~/revisions/ or ~/changes/ segment and we ignore everything before it
+    if (
+        tildeIndex >= 0 &&
+        (pathSegments[tildeIndex + 1] === 'revisions' || pathSegments[tildeIndex + 1] === 'changes')
+    ) {
+        const tildeIndex = pathSegments.indexOf('~');
+        const revisionOrChangeIdIndex = tildeIndex + 2;
+
+        basePath = pathSegments.slice(tildeIndex, revisionOrChangeIdIndex + 1).join('/');
+        if (pathSegments[tildeIndex + 1] === 'revisions') {
+            revision = pathSegments[revisionOrChangeIdIndex];
+        } else {
+            changeRequest = pathSegments[revisionOrChangeIdIndex];
+        }
+
+        // Match up to the tilde
+        const contentURL = new URL(url);
+        contentURL.pathname = pathSegments.slice(0, tildeIndex).join('/');
+        pushAlternative(contentURL, pathSegments.slice(revisionOrChangeIdIndex + 1).join('/'));
+    }
+
+    // URL looks like a collection url (with /v/ in the path)
+    // We only start matching after the /v/ segment and we ignore everything before it
+    // to avoid potentially matching as a page not found under the default space in the collection
+    else if (pathSegments.includes('v')) {
+        const collectionURL = new URL(url);
+        const vIndex = pathSegments.indexOf('v');
+        collectionURL.pathname = pathSegments.slice(0, vIndex + 2).join('/');
+
+        pushAlternative(collectionURL, pathSegments.slice(vIndex + 2).join('/'));
+    } else {
+        // Match only with the host, if it can be a custom hostname
+        // It should cover most cases of custom domains, and with caching, it should be fast.
+        if (!url.hostname.includes('.gitbook.io') || pathSegments.length === 0) {
+            const noPathURL = new URL(url);
+            noPathURL.pathname = '/';
+
+            pushAlternative(noPathURL, url.pathname.slice(1));
+        }
+
+        // Otherwise match with the first four segments of the path
+        for (let i = 1; i <= 4; i++) {
+            if (pathSegments.length >= i) {
+                const shortURL = new URL(url);
+                shortURL.pathname = pathSegments.slice(0, i).join('/');
+
+                pushAlternative(shortURL, pathSegments.slice(i).join('/'));
+            }
+        }
+    }
+
+    // Mark the longuest entry to lookup as primary
+    alternatives.sort((a, b) => b.extraPath.length - a.extraPath.length);
+    if (alternatives.length > 0) {
+        alternatives[alternatives.length - 1].primary = true;
+    }
+
+    return { urls: alternatives, basePath, changeRequest, revision };
+}
+
+/**
+ * Normalize a URL to remove duplicate slashes and trailing slashes
+ * and transform the pathname to lowercase.
+ */
+export function normalizeURL(url: URL) {
+    const result = new URL(url);
+    result.pathname = url.pathname.replace(/\/{2,}/g, '/').replace(/\/$/, '');
+    return result;
+}
+
+/**
+ * Strip the search params from a URL
+ */
+export function stripURLSearch(url: URL): URL {
+    const stripped = new URL(url.toString());
+    stripped.search = '';
+    return stripped;
+}
@@ -0,0 +1,89 @@
+import 'server-only';
+
+/*
+ * Support both Cloudflare and Vercel, environment variables can be bundled.
+ * To avoid leaking them on the client-side, they should be accessed from this file
+ * and not from the `process.env` object.
+ */
+
+/**
+ * Main host on which GitBook is running.
+ */
+export const GITBOOK_URL =
+    process.env.NODE_ENV === 'development'
+        ? 'http://localhost:3000'
+        : (process.env.GITBOOK_URL ??
+          (process.env.VERCEL_URL ? `https://${process.env.VERCEL_URL}` : undefined) ??
+          '');
+
+/**
+ * URL at which static assets are served.
+ */
+export const GITBOOK_ASSETS_URL =
+    process.env.NODE_ENV === 'development'
+        ? 'http://localhost:3000'
+        : process.env.GITBOOK_ASSETS_PREFIX;
+
+/**
+ * GitBook app URL.
+ */
+export const GITBOOK_APP_URL = process.env.GITBOOK_APP_URL || 'https://app.gitbook.com';
+
+/**
+ * Default GitBook API URL endpoint.
+ */
+export const GITBOOK_API_URL = process.env.GITBOOK_API_URL || 'https://api.gitbook.com';
+
+/**
+ * Default GitBook API URL endpoint, to be shared with the client.
+ */
+export const GITBOOK_API_PUBLIC_URL = process.env.GITBOOK_API_PUBLIC_URL || GITBOOK_API_URL;
+
+/**
+ * Default GitBook API token.
+ * It can be use to avoid rate-limiting.
+ */
+export const GITBOOK_API_TOKEN = process.env.GITBOOK_API_TOKEN || null;
+
+/**
+ * User agent to use for API requests.
+ */
+export const GITBOOK_USER_AGENT = process.env.GITBOOK_USER_AGENT || 'GitBook-Open/2.0.0';
+
+/**
+ * Whether to disable tracking of events into site insights.
+ * This is used to disable tracking in development mode.
+ */
+export const GITBOOK_DISABLE_TRACKING = Boolean(
+    !!process.env.GITBOOK_DISABLE_TRACKING || process.env.NODE_ENV !== 'production'
+);
+
+/**
+ * Hostname serving the integrations.
+ */
+export const GITBOOK_INTEGRATIONS_HOST =
+    process.env.GITBOOK_INTEGRATIONS_HOST || 'integrations.gitbook.com';
+
+/**
+ * Endpoint to use for resizing images.
+ * It should be a Cloudflare domain with image resizing enabled.
+ */
+export const GITBOOK_IMAGE_RESIZE_URL = process.env.GITBOOK_IMAGE_RESIZE_URL ?? null;
+export const GITBOOK_IMAGE_RESIZE_SIGNING_KEY =
+    process.env.GITBOOK_IMAGE_RESIZE_SIGNING_KEY ?? null;
+
+/**
+ * Endpoint where icons are served.
+ */
+export const GITBOOK_ICONS_URL =
+    process.env.GITBOOK_ICONS_URL || `${GITBOOK_ASSETS_URL || ''}/~gitbook/static/icons`;
+
+/**
+ * Token passed to the icons endpoint.
+ */
+export const GITBOOK_ICONS_TOKEN = process.env.GITBOOK_ICONS_TOKEN;
+
+/**
+ * Secret used to validate requests from the GitBook app.
+ */
+export const GITBOOK_SECRET = process.env.GITBOOK_SECRET ?? null;
@@ -0,0 +1,2 @@
+export * from './globals';
+export * from './urls';
@@ -0,0 +1,45 @@
+import { GITBOOK_ASSETS_URL, GITBOOK_URL } from './globals';
+
+/**
+ * Check if the URL is a GitBook host URL.
+ */
+export function isGitBookHostURL(input: URL | string): boolean {
+    const url = typeof input === 'string' ? new URL(input) : input;
+
+    if (!GITBOOK_URL) {
+        return false;
+    }
+
+    const gitbookHost = new URL(GITBOOK_URL).host;
+
+    if (url.host === gitbookHost) {
+        return true;
+    }
+
+    // Handle the Cloudflare preview URLs that are prefixed with a random hash
+    // https://developers.cloudflare.com/workers/configuration/previews/
+    if (url.host.endsWith(`-${gitbookHost}`)) {
+        return true;
+    }
+
+    return false;
+}
+
+/**
+ * Check if the URL is a GitBook assets host URL.
+ */
+export function isGitBookAssetsHostURL(input: URL | string): boolean {
+    const url = typeof input === 'string' ? new URL(input) : input;
+
+    if (!GITBOOK_ASSETS_URL) {
+        return false;
+    }
+
+    const gitbookAssetsHost = new URL(GITBOOK_ASSETS_URL).host;
+
+    if (url.host === gitbookAssetsHost) {
+        return true;
+    }
+
+    return false;
+}
@@ -0,0 +1,243 @@
+import 'server-only';
+
+import { GITBOOK_IMAGE_RESIZE_SIGNING_KEY, GITBOOK_IMAGE_RESIZE_URL } from '../env';
+import type { GitBookSpaceLinker } from '../links';
+import { type SignatureVersion, generateImageSignature } from './signatures';
+import type { ImageResizer } from './types';
+
+interface CloudflareImageJsonFormat {
+    width: number;
+    height: number;
+    original: {
+        file_size: number;
+        width: number;
+        height: number;
+        format: string;
+    };
+}
+
+/**
+ * https://developers.cloudflare.com/images/image-resizing/resize-with-workers/
+ */
+export interface CloudflareImageOptions {
+    format?: 'webp' | 'avif' | 'json' | 'jpeg';
+    fit?: 'scale-down' | 'contain' | 'cover' | 'crop' | 'pad';
+    width?: number;
+    height?: number;
+    dpr?: number;
+    anim?: boolean;
+    quality?: number;
+}
+
+/**
+ * Create an image resizer for a rendering context.
+ */
+export function createImageResizer({
+    host,
+    linker,
+}: {
+    /** The linker to use to create URLs. */
+    linker: GitBookSpaceLinker;
+    /** The host name of the current site. */
+    host: string;
+}): ImageResizer {
+    if (!GITBOOK_IMAGE_RESIZE_URL || !GITBOOK_IMAGE_RESIZE_SIGNING_KEY) {
+        return createNoopImageResizer();
+    }
+
+    return {
+        getResizedImageURL: (urlInput) => {
+            if (!checkIsSizableImageURL(urlInput)) {
+                return null;
+            }
+
+            let cachedSignature: {
+                signature: string;
+                version: SignatureVersion;
+            } | null = null;
+
+            return async (options) => {
+                cachedSignature ??= await generateImageSignature({
+                    host,
+                    url: urlInput,
+                });
+
+                const url = linker.toAbsoluteURL(linker.toPathInContent('/~gitbook/image'));
+                const searchParams = new URLSearchParams();
+                searchParams.set('url', getImageAPIUrl(urlInput));
+
+                if (options.width) {
+                    searchParams.set('width', options.width.toString());
+                }
+                if (options.height) {
+                    searchParams.set('height', options.height.toString());
+                }
+                if (options.dpr) {
+                    searchParams.set('dpr', options.dpr.toString());
+                }
+                if (options.quality) {
+                    searchParams.set('quality', options.quality.toString());
+                }
+
+                searchParams.set('sign', cachedSignature.signature);
+                searchParams.set('sv', cachedSignature.version);
+
+                return `${url}?${searchParams.toString()}`;
+            };
+        },
+
+        getImageSize: async (input, options) => {
+            if (!checkIsSizableImageURL(input)) {
+                return null;
+            }
+
+            return getImageSize(input, options);
+        },
+    };
+}
+
+/**
+ * Create an image resizer that doesn't do any resizing.
+ */
+export function createNoopImageResizer(): ImageResizer {
+    return {
+        getResizedImageURL: () => null,
+        getImageSize: async (_input) => null,
+    };
+}
+
+/**
+ * Check if a URL is an HTTP URL.
+ */
+export function checkIsHttpURL(input: string | URL): boolean {
+    if (!URL.canParse(input)) {
+        return false;
+    }
+    const parsed = new URL(input);
+    return parsed.protocol === 'http:' || parsed.protocol === 'https:';
+}
+
+/**
+ * Check if an image URL is resizable.
+ * Skip it for non-http(s) URLs (data, etc).
+ * Skip it for SVGs.
+ * Skip it for GitBook images (to avoid recursion).
+ */
+export function checkIsSizableImageURL(input: string): boolean {
+    if (!URL.canParse(input)) {
+        return false;
+    }
+
+    if (input.includes('/~gitbook/image')) {
+        return false;
+    }
+
+    const parsed = new URL(input);
+    if (parsed.pathname.endsWith('.svg') || parsed.pathname.endsWith('.avif')) {
+        return false;
+    }
+    if (!checkIsHttpURL(parsed)) {
+        return false;
+    }
+
+    return true;
+}
+
+/**
+ * Get the size of an image.
+ */
+export async function getImageSize(
+    input: string,
+    defaultSize: Partial<CloudflareImageOptions> = {}
+): Promise<{ width: number; height: number } | null> {
+    if (!checkIsSizableImageURL(input)) {
+        return null;
+    }
+
+    try {
+        const response = await resizeImage(input, {
+            // Abort the request after 2 seconds to avoid blocking rendering for too long
+            signal: AbortSignal.timeout(2000),
+            // Measure size and resize it to the most common size
+            // to optimize caching
+            ...defaultSize,
+            format: 'json',
+            anim: false,
+        });
+
+        const json = (await response.json()) as CloudflareImageJsonFormat;
+        return {
+            width: json.original.width,
+            height: json.original.height,
+        };
+    } catch (_error) {
+        return null;
+    }
+}
+
+/**
+ * Execute a Cloudflare Image Resize operation on an image.
+ */
+export async function resizeImage(
+    input: string,
+    options: CloudflareImageOptions & {
+        signal?: AbortSignal;
+    }
+): Promise<Response> {
+    const { signal, ...resizeOptions } = options;
+
+    const parsed = new URL(input);
+    if (parsed.protocol === 'data:') {
+        throw new Error('Cannot resize data: URLs');
+    }
+
+    if (parsed.hostname === 'localhost') {
+        throw new Error('Cannot resize localhost URLs');
+    }
+
+    // Since Cloudflare Images options on fetch are not supported on Cloudflare Pages,
+    // we need to use the Cloudflare Image Resize API directly.
+    if (!GITBOOK_IMAGE_RESIZE_URL) {
+        throw new Error('GITBOOK_IMAGE_RESIZE_URL is not set');
+    }
+
+    return await fetch(
+        `${GITBOOK_IMAGE_RESIZE_URL}${stringifyOptions(
+            resizeOptions
+        )}/${encodeURIComponent(input)}`,
+        {
+            headers: {
+                // Pass the `Accept` header, as Cloudflare uses this to validate the format.
+                Accept:
+                    resizeOptions.format === 'json'
+                        ? 'application/json'
+                        : `image/${resizeOptions.format || 'jpeg'}`,
+            },
+            signal,
+        }
+    );
+}
+
+function stringifyOptions(options: CloudflareImageOptions): string {
+    return Object.entries({ ...options }).reduce((rest, [key, value]) => {
+        return `${rest}${rest ? ',' : ''}${key}=${value}`;
+    }, '');
+}
+
+/**
+ * Because of a bug in Cloudflare, 127.0.0.1 is replaced by localhost.
+ * We protect against it by converting to a special token, and then parsing
+ * the token in the image API.
+ */
+const GITBOOK_LOCALHOST_TOKEN = '$GITBOOK_LOCALHOST$';
+
+/**
+ * Prepare a URL for the GitBook Open Image API.
+ */
+export function getImageAPIUrl(url: string): string {
+    return url.replaceAll('127.0.0.1', GITBOOK_LOCALHOST_TOKEN);
+}
+
+export function parseImageAPIURL(url: string): string {
+    return url.replaceAll(GITBOOK_LOCALHOST_TOKEN, '127.0.0.1');
+}
@@ -0,0 +1,4 @@
+export * from './types';
+export * from './createImageResizer';
+export * from './signatures';
+export * from './utils';
@@ -0,0 +1,112 @@
+import 'server-only';
+
+import fnv1a from '@sindresorhus/fnv1a';
+import type { MaybePromise } from 'p-map';
+import { assert } from 'ts-essentials';
+import { GITBOOK_IMAGE_RESIZE_SIGNING_KEY } from '../env';
+
+/**
+ * GitBook has supported different version of image signing in the past. To maintain backwards
+ * compatibility, we retain the ability to verify older signatures.
+ */
+export type SignatureVersion = '0' | '1' | '2';
+
+/**
+ * The current version of the signature.
+ */
+export const CURRENT_SIGNATURE_VERSION: SignatureVersion = '2';
+
+type SignFnInput = {
+    url: string;
+    host: string;
+};
+
+type SignFn = (input: SignFnInput) => MaybePromise<string>;
+
+/**
+ * Verify a signature of an image URL
+ */
+export async function verifyImageSignature(
+    input: SignFnInput,
+    { signature, version }: { signature: string; version: SignatureVersion }
+): Promise<boolean> {
+    const generator = IMAGE_SIGNATURE_FUNCTIONS[version];
+    const generated = await generator(input);
+    return generated === signature;
+}
+
+/**
+ * Generate an image signature. Also returns the version of the image signing algorithm that was used.
+ *
+ * This function is sync. If you need to implement an async version of image signing, you'll need to change
+ * ths signature of this fn and where it's used.
+ */
+export async function generateImageSignature(input: SignFnInput): Promise<{
+    signature: string;
+    version: SignatureVersion;
+}> {
+    const result = await generateSignatureV2(input);
+    return { signature: result, version: CURRENT_SIGNATURE_VERSION };
+}
+
+// Reused buffer for FNV-1a hashing in the v2 algorithm
+const fnv1aUtf8Buffer = new Uint8Array(512);
+
+/**
+ * Generate a signature for an image.
+ * The signature is relative to the current site being rendered to avoid serving images from other sites on the same domain.
+ */
+const generateSignatureV2: SignFn = async (input) => {
+    assert(GITBOOK_IMAGE_RESIZE_SIGNING_KEY, 'GITBOOK_IMAGE_RESIZE_SIGNING_KEY is not set');
+    const all = [
+        input.url,
+        input.host, // The hostname is used to avoid serving images from other sites on the same domain
+        GITBOOK_IMAGE_RESIZE_SIGNING_KEY,
+    ]
+        .filter(Boolean)
+        .join(':');
+    return fnv1a(all, { utf8Buffer: fnv1aUtf8Buffer }).toString(16);
+};
+
+// Reused buffer for FNV-1a hashing in the v1 algorithm
+const fnv1aUtf8BufferV1 = new Uint8Array(512);
+
+/**
+ * New and faster algorithm to generate a signature for an image.
+ * When setting it in a URL, we use version '1' for the 'sv' querystring parameneter
+ * to know that it was the algorithm that was used.
+ */
+const generateSignatureV1: SignFn = async (input) => {
+    assert(GITBOOK_IMAGE_RESIZE_SIGNING_KEY, 'GITBOOK_IMAGE_RESIZE_SIGNING_KEY is not set');
+    const all = [input.url, GITBOOK_IMAGE_RESIZE_SIGNING_KEY].filter(Boolean).join(':');
+    return fnv1a(all, { utf8Buffer: fnv1aUtf8BufferV1 }).toString(16);
+};
+
+/**
+ * Initial algorithm used to generate a signature for an image. It didn't use any versioning in the URL.
+ * We still need it to validate older signatures that were generated without versioning
+ * but still exist in previously generated and cached content.
+ */
+const generateSignatureV0: SignFn = async (input) => {
+    assert(GITBOOK_IMAGE_RESIZE_SIGNING_KEY, 'GITBOOK_IMAGE_RESIZE_SIGNING_KEY is not set');
+    const all = [input.url, GITBOOK_IMAGE_RESIZE_SIGNING_KEY].filter(Boolean).join(':');
+    const hash = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(all));
+
+    // Convert ArrayBuffer to hex string
+    const hashArray = Array.from(new Uint8Array(hash));
+    const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
+    return hashHex;
+};
+
+/**
+ * A mapping of signature versions to signature functions.
+ */
+const IMAGE_SIGNATURE_FUNCTIONS: Record<SignatureVersion, SignFn> = {
+    '0': generateSignatureV0,
+    '1': generateSignatureV1,
+    '2': generateSignatureV2,
+};
+
+export function isSignatureVersion(input: string): input is SignatureVersion {
+    return Object.keys(IMAGE_SIGNATURE_FUNCTIONS).includes(input);
+}
@@ -0,0 +1,29 @@
+export type GetImageSizeOptions = {
+    dpr?: number;
+};
+
+export type ResizeImageOptions = GetImageSizeOptions & {
+    width?: number;
+    height?: number;
+    dpr?: number;
+    quality?: number;
+};
+
+interface ImageSize {
+    width: number;
+    height: number;
+}
+
+export type ImageResizer = {
+    /**
+     * Resize an image.
+     * @param input - The image URL to resize.
+     * @param options - The options to resize the image.
+     */
+    getResizedImageURL(imageURL: string): null | ((options: ResizeImageOptions) => Promise<string>);
+
+    /**
+     * Get the size of an image.
+     */
+    getImageSize(imageURL: string, options: GetImageSizeOptions): Promise<ImageSize | null>;
+};
@@ -0,0 +1,17 @@
+import type { ImageResizer, ResizeImageOptions } from './types';
+
+/**
+ * Quick utility to get a resized image URL.
+ */
+export async function getResizedImageURL(
+    resizer: ImageResizer | undefined,
+    url: string,
+    options: ResizeImageOptions
+) {
+    const getURL = resizer?.getResizedImageURL(url);
+    if (!getURL) {
+        return url;
+    }
+
+    return await getURL(options);
+}
@@ -0,0 +1,58 @@
+import { describe, expect, it } from 'bun:test';
+import { appendBasePathToLinker, createLinker } from './links';
+
+const root = createLinker({
+    host: 'docs.company.com',
+    pathname: '/',
+});
+
+const variantInSection = createLinker({
+    host: 'docs.company.com',
+    pathname: '/section/variant',
+});
+
+describe('toPathInContent', () => {
+    it('should return the correct path', () => {
+        expect(root.toPathInContent('some/path')).toBe('/some/path');
+        expect(variantInSection.toPathInContent('some/path')).toBe('/section/variant/some/path');
+    });
+
+    it('should handle leading slash', () => {
+        expect(root.toPathInContent('/some/path')).toBe('/some/path');
+        expect(variantInSection.toPathInContent('/some/path')).toBe('/section/variant/some/path');
+    });
+});
+
+describe('toAbsoluteURL', () => {
+    it('should return the correct path', () => {
+        expect(root.toAbsoluteURL('some/path')).toBe('https://docs.company.com/some/path');
+        expect(variantInSection.toAbsoluteURL('some/path')).toBe(
+            'https://docs.company.com/some/path'
+        );
+    });
+});
+
+describe('appendBasePathToLinker', () => {
+    const prefixedRoot = appendBasePathToLinker(root, '/section/variant');
+    const prefixedVariantInSection = appendBasePathToLinker(variantInSection, '/base');
+
+    describe('toPathInContent', () => {
+        it('should return the correct path', () => {
+            expect(prefixedRoot.toPathInContent('some/path')).toBe('/section/variant/some/path');
+            expect(prefixedVariantInSection.toPathInContent('some/path')).toBe(
+                '/section/variant/base/some/path'
+            );
+        });
+    });
+
+    describe('toAbsoluteURL', () => {
+        it('should return the correct path', () => {
+            expect(prefixedRoot.toAbsoluteURL('some/path')).toBe(
+                'https://docs.company.com/some/path'
+            );
+            expect(prefixedVariantInSection.toAbsoluteURL('some/path')).toBe(
+                'https://docs.company.com/some/path'
+            );
+        });
+    });
+});
@@ -0,0 +1,116 @@
+import { getPagePath } from '@/lib/pages';
+import type { RevisionPage, RevisionPageDocument, RevisionPageGroup } from '@gitbook/api';
+import warnOnce from 'warn-once';
+
+/**
+ * Generic interface to generate links based on a given context.
+ *
+ * URL levels:
+ *
+ * https://docs.company.com/section/variant/page
+ *
+ * toPathInContent('some/path') => /section/variant/some/path
+ * toPathForPage({ pages, page }) => /section/variant/some/path
+ * toAbsoluteURL('some/path') => https://docs.company.com/some/path
+ */
+export interface GitBookSpaceLinker {
+    /**
+     * Generate an absolute path for a relative path to the current content.
+     */
+    toPathInContent(relativePath: string): string;
+
+    /**
+     * Generate an absolute path for a page in the current content.
+     * The result should NOT be passed to `toPathInContent`.
+     */
+    toPathForPage(input: {
+        pages: RevisionPage[];
+        page: RevisionPageDocument | RevisionPageGroup;
+        anchor?: string;
+    }): string;
+
+    /**
+     * Generate an absolute URL for a given path relative to the host of the current content.
+     */
+    toAbsoluteURL(absolutePath: string): string;
+
+    /**
+     * Generate a link (URL or path) for a GitBook content URL (url of another site)
+     */
+    toLinkForContent(url: string): string;
+}
+
+/**
+ * Create a linker to resolve links in a context being served on a specific URL.
+ */
+export function createLinker(
+    /** Where the top of the space is served on */
+    servedOn: {
+        protocol?: string;
+        host?: string;
+        pathname: string;
+    }
+): GitBookSpaceLinker {
+    warnOnce(!servedOn.host, 'No host provided to createLinker. It can lead to issues with links.');
+
+    const linker: GitBookSpaceLinker = {
+        toPathInContent(relativePath: string): string {
+            return joinPaths(servedOn.pathname, relativePath);
+        },
+
+        toAbsoluteURL(absolutePath: string): string {
+            if (!servedOn.host) {
+                return absolutePath;
+            }
+
+            return `${servedOn.protocol ?? 'https:'}//${joinPaths(servedOn.host, absolutePath)}`;
+        },
+
+        toPathForPage({ pages, page, anchor }) {
+            return linker.toPathInContent(getPagePath(pages, page)) + (anchor ? `#${anchor}` : '');
+        },
+
+        toLinkForContent(url: string): string {
+            return url;
+        },
+    };
+
+    return linker;
+}
+
+/**
+ * Append a prefix to a linker.
+ */
+export function appendBasePathToLinker(
+    linker: GitBookSpaceLinker,
+    basePath: string
+): GitBookSpaceLinker {
+    const linkerWithPrefix: GitBookSpaceLinker = {
+        toPathInContent(relativePath: string): string {
+            return linker.toPathInContent(joinPaths(basePath, relativePath));
+        },
+
+        toAbsoluteURL(absolutePath: string): string {
+            return linker.toAbsoluteURL(absolutePath);
+        },
+
+        toPathForPage({ pages, page, anchor }) {
+            return (
+                linkerWithPrefix.toPathInContent(getPagePath(pages, page)) +
+                (anchor ? `#${anchor}` : '')
+            );
+        },
+
+        toLinkForContent(url: string): string {
+            return linker.toLinkForContent(url);
+        },
+    };
+
+    return linkerWithPrefix;
+}
+
+function joinPaths(prefix: string, path: string): string {
+    const prefixPath = prefix.endsWith('/') ? prefix : `${prefix}/`;
+    const suffixPath = path.startsWith('/') ? path.slice(1) : path;
+    return prefixPath + suffixPath;
+}
@@ -0,0 +1,134 @@
+import { CustomizationThemeMode, type PublishedSiteContent } from '@gitbook/api';
+import { headers } from 'next/headers';
+
+export enum MiddlewareHeaders {
+    /**
+     * Type of the route (static or dynamic)
+     */
+    RouteType = 'x-gitbook-route-type',
+
+    /**
+     * The URL of the site (without the pathname)
+     */
+    SiteURL = 'x-gitbook-site-url',
+
+    /**
+     * The data associated with the URL.
+     */
+    SiteURLData = 'x-gitbook-site-url-data',
+
+    /**
+     * The mode of the URL (url or url-host)
+     */
+    URLMode = 'x-gitbook-url-mode',
+
+    /**
+     * The theme of the page (light or dark)
+     */
+    Theme = 'x-gitbook-theme',
+
+    /**
+     * The customization override to apply.
+     */
+    Customization = 'x-gitbook-customization',
+
+    /**
+     * The visitor token used to access this content
+     */
+    VisitorAuthToken = 'x-gitbook-visitor-token',
+
+    /**
+     * The API token used to fetch the content.
+     * This should only be passed for non-site dynamic routes.
+     */
+    APIToken = 'x-gitbook-api-token',
+}
+
+/**
+ * Get the URL mode from the middleware headers.
+ * This function should only be called in a server action or a dynamic route.
+ */
+export async function getURLModeFromMiddleware(): Promise<'url' | 'url-host'> {
+    const headersList = await headers();
+    const mode = headersList.get(MiddlewareHeaders.URLMode);
+    if (!mode) {
+        throw new Error('URL mode is not set by the middleware');
+    }
+
+    return mode as 'url' | 'url-host';
+}
+
+/**
+ * Get the site URL data from the middleware headers.
+ * This function should only be called in a server action or a dynamic route.
+ */
+export async function getSiteURLDataFromMiddleware(): Promise<PublishedSiteContent> {
+    const headersList = await headers();
+    const siteURLData = headersList.get(MiddlewareHeaders.SiteURLData);
+
+    if (!siteURLData) {
+        throw new Error(
+            'Site URL data is not set by the middleware. This should only be called in a server action or a dynamic route.'
+        );
+    }
+
+    return JSON.parse(siteURLData);
+}
+
+/**
+ * Get the URL from the middleware headers.
+ * This function should only be called in a server action or a dynamic route.
+ */
+export async function getSiteURLFromMiddleware(): Promise<string> {
+    const headersList = await headers();
+    const siteURL = headersList.get(MiddlewareHeaders.SiteURL);
+    if (!siteURL) {
+        throw new Error('URL mode is not set by the middleware');
+    }
+
+    return siteURL;
+}
+
+/**
+ * For preview, the theme can be set via query string (?theme=light).
+ * This function should only be called in a dynamic route.
+ */
+export async function getThemeFromMiddleware() {
+    const headersList = await headers();
+    const queryStringTheme = headersList.get(MiddlewareHeaders.Theme);
+    if (!queryStringTheme) {
+        return null;
+    }
+
+    return queryStringTheme === 'light'
+        ? CustomizationThemeMode.Light
+        : CustomizationThemeMode.Dark;
+}
+
+/**
+ * Get the visitor auth token from the middleware headers.
+ * This function should only be called in a dynamic route.
+ */
+export async function getVisitorAuthTokenFromMiddleware(): Promise<string | null> {
+    const headersList = await headers();
+    const visitorAuthToken = headersList.get(MiddlewareHeaders.VisitorAuthToken);
+    if (!visitorAuthToken) {
+        return null;
+    }
+
+    return visitorAuthToken;
+}
+
+/**
+ * Get the API token from the middleware headers.
+ * This function should only be called in a dynamic route.
+ */
+export async function getAPITokenFromMiddleware(): Promise<string> {
+    const headersList = await headers();
+    const apiToken = headersList.get(MiddlewareHeaders.APIToken);
+    if (!apiToken) {
+        throw new Error('API token is not set by the middleware');
+    }
+
+    return apiToken;
+}
--- a/Show More
+++ b/Show More