提交

src/util.ts

@@ -103,6 +103,18 @@ export function activityUrl(env: Env, activityId: string): string {
   return `${baseUrl(env)}/activities/${activityId}`;
 }
 
+export function mediaCdnBaseUrl(env: Env): string | null {
+  const value = (env.MEDIA_BASE_URL ?? "").trim();
+  if (!value) return null;
+  return value.replace(/\/+$/, "");
+}
+
+export function mediaUrl(env: Env, r2Key: string): string {
+  const cdn = mediaCdnBaseUrl(env);
+  if (cdn) return `${cdn}/${r2Key.split("/").map(encodeURIComponent).join("/")}`;
+  return `${baseUrl(env)}/media/${encodeURIComponent(r2Key)}`;
+}
+
 export function isLocalActor(env: Env, actorId: string): boolean {
   try {
     return new URL(actorId).host === hostFromBaseUrl(env);