[alaa] fix playlist extraction

youtube_dl/extractor/alaa.py

@@ -35,10 +35,10 @@ class AlaaIE(InfoExtractor):
 
         def map_formats(v):
             return {
-                "url": v.get("link"),
-                "filesize": parse_filesize(v.get("size")),
-                "format_id": v.get("res"),
-                "ext": v.get("ext"),
+                'url': v.get('link'),
+                'filesize': parse_filesize(v.get('size')),
+                'format_id': v.get('res'),
+                'ext': v.get('ext'),
             }
 
         formats = list(map(map_formats, video_details['file']['video']))
@@ -48,5 +48,34 @@ class AlaaIE(InfoExtractor):
             'title': video_details['title'],
             'formats': formats,
             'thumbnail': url_or_none(video_image),
-            'duration': int_or_none(parse_duration(video_details.get('duration') + ":00"))
+            'duration': int_or_none(parse_duration(video_details.get('duration') + ':00'))
         }
+
+
+class AlaaPlaylistIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)?alaatv.com/set/(?P<id>[0-9]+)'
+
+    _TEST = {
+        'url': 'https://alaatv.com/set/181',
+        'info_dict': {
+            'title': 'صفر تا صد فیزیک یازدهم - فرشید داداشی',
+            'id': '181',
+        },
+        'playlist_count': 81,
+    }
+
+    def _real_extract(self, url):
+        set_id = self._match_id(url)
+        set_data = self._download_json('https://alaatv.com/api/v2/set/{0}'.format(set_id), set_id)
+        set_title = set_data['data']['title']
+
+        def map_formats(v):
+            return {
+                'id': str(v['id']),
+                'title': v['title'],
+                'url': v['url']['web'],
+            }
+
+        set_content = list(map(map_formats, set_data['data']['contents']))
+
+        return self.playlist_result(set_content, set_id, set_title)

youtube_dl/extractor/extractors.py

@@ -39,7 +39,10 @@ from .aenetworks import (
 from .afreecatv import AfreecaTVIE
 from .airmozilla import AirMozillaIE
 from .aljazeera import AlJazeeraIE
-from .alaa import AlaaIE
+from .alaa import (
+    AlaaIE,
+    AlaaPlaylistIE
+)
 from .alphaporno import AlphaPornoIE
 from .amara import AmaraIE
 from .amcnetworks import AMCNetworksIE