Initial commit

src/lib/api/upstreamProxy.ts

@@ -0,0 +1,50 @@
+export const UPSTREAM_API =
+  process.env.UPSTREAM_API_URL ?? "https://api.modstagram.ir";
+
+type ProxyOptions = {
+  stripAuth?: boolean;
+};
+
+export async function proxyToUpstream(
+  req: Request,
+  upstreamPath: string,
+  options?: ProxyOptions
+): Promise<Response> {
+  const url = new URL(upstreamPath, UPSTREAM_API);
+  const incoming = new URL(req.url);
+  url.search = incoming.search;
+
+  const headers = new Headers();
+  const contentType = req.headers.get("content-type");
+  if (contentType) headers.set("content-type", contentType);
+
+  if (!options?.stripAuth) {
+    const auth = req.headers.get("authorization");
+    if (auth) headers.set("authorization", auth);
+  }
+
+  const method = req.method;
+  const body =
+    method !== "GET" && method !== "HEAD" ? await req.arrayBuffer() : undefined;
+
+  const upstream = await fetch(url.toString(), {
+    method,
+    headers,
+    body,
+    cache: "no-store",
+  });
+
+  const responseHeaders = new Headers();
+  const upstreamType = upstream.headers.get("content-type");
+  if (upstreamType) responseHeaders.set("content-type", upstreamType);
+
+  return new Response(upstream.body, {
+    status: upstream.status,
+    headers: responseHeaders,
+  });
+}
+
+export function isPublicAuthPath(pathSegments: string[]): boolean {
+  const path = pathSegments.join("/");
+  return path.startsWith("login") || path.startsWith("register");
+}