feat(backend): Bearcaps URLに対応

packages/backend/src/core/HttpRequestService.ts

@@ -177,11 +177,14 @@ export class HttpRequestService {
 			controller.abort();
 		}, timeout);
 
-		const res = await fetch(url, {
+		const bearcaps = url.startsWith('bear:?') ? this.parseBearcaps(url) : undefined;
+
+		const res = await fetch(bearcaps?.url ?? url, {
 			method: args.method ?? 'GET',
 			headers: {
 				'User-Agent': this.config.userAgent,
 				...(args.headers ?? {}),
+				...(bearcaps?.token ? { Authorization: `Bearer ${bearcaps.token}` } : {}),
 			},
 			body: args.body,
 			size: args.size ?? 10 * 1024 * 1024,
@@ -201,4 +204,17 @@ export class HttpRequestService {
 
 		return res;
 	}
+
+	// Bearcaps https://docs.joinmastodon.org/spec/bearcaps/
+	// bear:?t=<token>&u=https://example.com/foo'
+	// -> GET https://example.com/foo Authorization: Bearer <token>
+	private parseBearcaps(url: string): { url: string, token: string | undefined } | undefined {
+		const params = new URLSearchParams(url.split('?')[1]);
+		if (!params.has('u')) return undefined;
+
+		return {
+			url: params.get('u')!,
+			token: params.get('t') ?? undefined,
+		};
+	}
 }