Fixed .false file extension.

src/methods/redditAlbum.js

@@ -8,22 +8,41 @@ function resolveMediaUrl(media) {
     return url ? url.replace(/&/g, '&') : null;
 }
 
+// reddit sends the non-standard 'image/jpg' instead of the real IANA 'image/jpeg' for
+// gallery items - left as-is, this silently breaks anything matching against real mime
+// types downstream (interpolate.js's extension lookup ends up with a '.false' extension,
+// fetch/content.js's addMeta() skips embedding metadata since it only matches 'image/jpeg')
+function normalizeType(type) {
+    return type === 'image/jpg' ? 'image/jpeg' : type;
+}
+
 async function redditAlbum(host, post, { reddit }) {
     // fetched through the authenticated/throttled client, not a raw fetch()/bhttp request -
     // reddit's anonymous-traffic bot challenge blocks plain unauthenticated .json requests
     const data = await reddit.getSubmission(post.id);
+    const mediaMetadata = data.media_metadata || {};
 
-    const items = (data.gallery_data?.items || [])
+    // gallery_data (the ordered {media_id, is_deleted, ...} list for this gallery) has been
+    // seen coming back null on a freshly-posted gallery even though media_metadata itself
+    // was already fully populated - fall back to media_metadata's own keys, in the order the
+    // JSON provided them (reddit sends them in gallery order, and object key order is
+    // preserved through JSON.parse), skipping anything not (yet, or any longer) valid
+    const galleryItems = data.gallery_data?.items
+        || Object.entries(mediaMetadata)
+            .filter(([, media]) => media.status === 'valid')
+            .map(([mediaId]) => ({ media_id: mediaId }));
+
+    const items = galleryItems
         .filter((item) => !item.is_deleted)
         .map((item) => {
-            const media = data.media_metadata?.[item.media_id];
+            const media = mediaMetadata[item.media_id];
             const url = resolveMediaUrl(media);
 
             return url && {
                 id: item.media_id,
                 url,
                 datetime: post.datetime,
-                type: media.m || 'image/jpeg',
+                type: normalizeType(media.m) || 'image/jpeg',
             };
         })
         .filter(Boolean);