Fix 404 for embed root page

Going to `/~gitbook/embed/page/` should load the space's root page, but returns a 404 instead. This fixes that.

packages/gitbook/src/app/utils.ts

@@ -19,7 +19,7 @@ export type RouteLayoutParams = {
 };
 
 export type RouteParams = RouteLayoutParams & {
-    pagePath: string;
+    pagePath?: string[];
 };
 
 /**
@@ -80,8 +80,10 @@ export async function getDynamicSiteContext(params: RouteLayoutParams) {
  * Get the decoded page path from the params.
  */
 export function getPagePathFromParams(params: RouteParams) {
-    const decoded = decodeURIComponent(params.pagePath);
-    return decoded;
+    if (!params.pagePath || params.pagePath.length === 0) {
+        return '';
+    }
+    return params.pagePath.map((part) => decodeURIComponent(part)).join('/');
 }
 
 function getSiteURLFromParams(params: RouteLayoutParams) {

packages/gitbook/src/middleware.ts

@@ -589,12 +589,10 @@ function encodePathInSiteContent(rawPathname: string): {
         return { pathname, routeType: 'static' };
     }
 
-    // If the pathname is an embedded page
-    const embedPage = pathname.match(/^~gitbook\/embed\/page\/(\S+)$/);
-    if (embedPage) {
-        return {
-            pathname: `~gitbook/embed/page/${encodeURIComponent(embedPage[1]!)}`,
-        };
+    // If the pathname is an embedded page, let the optional catch-all route [[...pagePath]] handle it
+    // This naturally supports both empty paths (~gitbook/embed/page) and paths with segments
+    if (pathname.match(/^~gitbook\/embed\/page(\/.*)?$/)) {
+        return { pathname };
     }
 
     switch (pathname) {