Fix error with crossposted Reddit galleries

bdfr/site_downloaders/gallery.py

@@ -21,7 +21,16 @@ class Gallery(BaseDownloader):
         super().__init__(post)
 
     def find_resources(self, authenticator: Optional[SiteAuthenticator] = None) -> list[Resource]:
+        try:
             image_urls = self._get_links(self.post.gallery_data['items'])
+        except AttributeError:
+            try:
+                image_urls = self._get_links(self.post.crosspost_parent_list[0]['gallery_data']['items'])
+            except (AttributeError, IndexError):
+                logger.error(f'Could not find gallery data in submission {self.post.id}')
+                logger.exception('Gallery image find failure')
+                raise SiteDownloaderError('No images found in Reddit gallery')
+
         if not image_urls:
             raise SiteDownloaderError('No images found in Reddit gallery')
         return [Resource(self.post, url) for url in image_urls]

tests/site_downloaders/test_gallery.py

@@ -56,6 +56,10 @@ def test_gallery_get_links(test_ids: list[dict], expected: set[str]):
         'b89a3f41feb73ec1136ec4ffa7353eb1',
         'cabb76fd6fd11ae6e115a2039eb09f04',
     }),
+    ('obkflw', {
+        '65163f685fb28c5b776e0e77122718be',
+        '2a337eb5b13c34d3ca3f51b5db7c13e9',
+    }),
 ))
 def test_gallery_download(test_submission_id: str, expected_hashes: set[str], reddit_instance: praw.Reddit):
     test_submission = reddit_instance.submission(id=test_submission_id)