refactor: unify inline directives and media fetch

src/msteams/attachments.ts

@@ -1,3 +1,4 @@
+import { fetchRemoteMedia } from "../media/fetch.js";
 import { detectMime } from "../media/mime.js";
 import { saveMediaBuffer } from "../media/store.js";
 
@@ -740,23 +741,28 @@ export async function downloadMSTeamsImageAttachments(params: {
   for (const candidate of candidates) {
     if (!isUrlAllowed(candidate.url, allowHosts)) continue;
     try {
-      const res = await fetchWithAuthFallback({
+      const fetchImpl: typeof fetch = (input) => {
+        const url =
+          typeof input === "string"
+            ? input
+            : input instanceof URL
+              ? input.toString()
+              : input.url;
+        return fetchWithAuthFallback({
+          url,
+          tokenProvider: params.tokenProvider,
+          fetchFn: params.fetchFn,
+        });
+      };
+      const fetched = await fetchRemoteMedia({
         url: candidate.url,
-        tokenProvider: params.tokenProvider,
-        fetchFn: params.fetchFn,
-      });
-      if (!res.ok) continue;
-      const buffer = Buffer.from(await res.arrayBuffer());
-      if (buffer.byteLength > params.maxBytes) continue;
-      const mime = await detectMime({
-        buffer,
-        headerMime:
-          candidate.contentTypeHint ?? res.headers.get("content-type"),
-        filePath: candidate.fileHint ?? candidate.url,
+        fetchImpl,
+        filePathHint: candidate.fileHint,
       });
+      if (fetched.buffer.byteLength > params.maxBytes) continue;
       const saved = await saveMediaBuffer(
-        buffer,
-        mime,
+        fetched.buffer,
+        fetched.contentType ?? candidate.contentTypeHint,
         "inbound",
         params.maxBytes,
       );