feat: overhaul config loading

tests/unit/config/config-file.test.ts

@@ -0,0 +1,81 @@
+import { dump } from 'js-yaml';
+import { beforeAll, describe, expect, test } from 'vitest';
+import { ConfigError } from '~/server/config/error';
+import { loadConfig, loadConfigFile } from '~/server/config/load';
+import { clearFakeFiles, createFakeFile } from '../setup/overlay-fs';
+
+const writeYaml = (filePath: string, content: unknown) => {
+	const yamlContent = dump(content);
+	createFakeFile(filePath, yamlContent);
+};
+
+describe('Configuration YAML file loading', () => {
+	beforeAll(() => {
+		clearFakeFiles();
+	});
+
+	test('should correctly parse different types from YAML file', async () => {
+		const filePath = '/config/test-config.yaml';
+		writeYaml(filePath, {
+			headscale: {
+				url: 'http://localhost:8080',
+			},
+			oidc: {
+				client_id: 'my-client-id',
+			},
+			server: {
+				port: 8000,
+			},
+			integration: {
+				agent: {
+					enabled: true,
+				},
+			},
+		});
+
+		const config = await loadConfigFile(filePath);
+		expect(config?.headscale?.url).toBe('http://localhost:8080');
+		expect(config?.oidc?.client_id).toBe('my-client-id');
+		expect(config?.server?.port).toBe(8000);
+		expect(config?.integration?.agent?.enabled).toBe(true);
+	});
+
+	test('should not throw errors for inaccessible file', async () => {
+		await expect(
+			loadConfigFile('/non-existent-path/config.yaml'),
+		).resolves.toBeUndefined();
+	});
+
+	test('should correctly get a finalized config from YAML', async () => {
+		const filePath = '/config/minimal-config.yaml';
+		writeYaml(filePath, {
+			headscale: {
+				url: 'http://localhost:8080',
+			},
+			server: {
+				cookie_secret: 'thirtytwo-character-cookiesecret',
+			},
+		});
+
+		const config = await loadConfig(filePath);
+		expect(config.headscale.url).toBe('http://localhost:8080');
+		expect(config.server.cookie_secret).toBe(
+			'thirtytwo-character-cookiesecret',
+		);
+	});
+
+	test('should throw error for missing required fields', async () => {
+		const filePath = '/config/invalid-config.yaml';
+		writeYaml(filePath, {
+			server: {
+				port: 8000,
+			},
+		});
+
+		await expect(loadConfig(filePath)).rejects.toEqual(
+			expect.objectContaining(
+				ConfigError.from('INVALID_REQUIRED_FIELDS', { messages: [] }),
+			),
+		);
+	});
+});