[redditr] Fix review issues and extract source thumbnail (closes #27503)

youtube_dl/extractor/reddit.py

@@ -8,8 +8,8 @@ from ..utils import (
     int_or_none,
     float_or_none,
     try_get,
-    url_or_none,
     unescapeHTML,
+    url_or_none,
 )
 
 
@@ -57,7 +57,8 @@ class RedditRIE(InfoExtractor):
             'id': 'zv89llsvexdz',
             'ext': 'mp4',
             'title': 'That small heart attack.',
-            'thumbnail': r're:^https?://.*\.jpg$',
+            'thumbnail': r're:^https?://.*\.(?:jpg|png)',
+            'thumbnails': 'count:4',
             'timestamp': 1501941939,
             'upload_date': '20170805',
             'uploader': 'Antw87',
@@ -120,16 +121,27 @@ class RedditRIE(InfoExtractor):
             age_limit = None
 
         thumbnails = []
-        images = try_get(
-            data, lambda x: x['preview']['images'][0]['resolutions']) or []
-        for image in images:
-            url = url_or_none(unescapeHTML(image['url']))
-            if url is not None:
-                thumbnails.append({
-                    'url': url,
-                    'width': int_or_none(image['width']),
-                    'height': int_or_none(image['height']),
-                })
+
+        def add_thumbnail(src):
+            if not isinstance(src, dict):
+                return
+            thumbnail_url = url_or_none(src.get('url'))
+            if not thumbnail_url:
+                return
+            thumbnails.append({
+                'url': unescapeHTML(thumbnail_url),
+                'width': int_or_none(src.get('width')),
+                'height': int_or_none(src.get('height')),
+            })
+
+        for image in try_get(data, lambda x: x['preview']['images']) or []:
+            if not isinstance(image, dict):
+                continue
+            add_thumbnail(image.get('source'))
+            resolutions = image.get('resolutions')
+            if isinstance(resolutions, list):
+                for resolution in resolutions:
+                    add_thumbnail(resolution)
 
         return {
             '_type': 'url_transparent',