[shahid] add default fallbacks for extracting api vars

youtube_dl/extractor/shahid.py

@@ -33,20 +33,30 @@ class ShahidIE(InfoExtractor):
         }
     ]
 
+    _api_vars = {
+        'type': 'player',
+        'url': 'http://api.shahid.net/api/v1_1',
+        'playerType': 'episode',
+    }
+
     def _real_extract(self, url):
         video_id = self._match_id(url)
         webpage = self._download_webpage(url, video_id)
 
         player_info = ''
-        for line in self._search_regex('var flashvars = ({[^}]+})', webpage, 'flashvars').splitlines():
+        flash_vars = self._search_regex('var flashvars = ({[^}]+})', webpage, 'flashvars', None)
+        if flash_vars is not None:
+            for line in flash_vars.splitlines():
                 if '+' not in line and '(' not in line and ')' not in line:
                     player_info += line
-        player_info = self._parse_json(js_to_json(player_info), video_id)
-        video_id = player_info['id']
-        player_type = player_info['playerType']
+            player_info = self._parse_json(player_info, video_id, js_to_json, False)
+            if player_info is not None:
+                for key in self._api_vars:
+                    if key in player_info:
+                        self._api_vars[key] = player_info[key]
 
         player_json_data = self._download_json(
-            'https://shahid.mbc.net/arContent/getPlayerContent-param-.id-' + video_id + '.type-' + player_info['type'] + '.html',
+            'https://shahid.mbc.net/arContent/getPlayerContent-param-.id-' + video_id + '.type-' + self._api_vars['type'] + '.html',
             video_id
         )['data']
         if 'url' in player_json_data:
@@ -57,13 +67,13 @@ class ShahidIE(InfoExtractor):
         formats = self._extract_m3u8_formats(m3u8_url, video_id)
 
         video_info = self._download_json(
-            player_info['url'] + '/' + player_type + '/' + video_id + '?apiKey=sh%40hid0nlin3&hash=b2wMCTHpSmyxGqQjJFOycRmLSex%2BBpTK%2Fooxy6vHaqs%3D',
+            self._api_vars['url'] + '/' + self._api_vars['playerType'] + '/' + video_id + '?apiKey=sh%40hid0nlin3&hash=b2wMCTHpSmyxGqQjJFOycRmLSex%2BBpTK%2Fooxy6vHaqs%3D',
             video_id
         )['data']
         if video_info.get('error'):
             for error in video_info['error']:
                 raise ExtractorError(error)
-        video_info = video_info[player_type]
+        video_info = video_info[self._api_vars['playerType']]
         title = video_info['title']
         thumbnail = video_info.get('thumbnailUrl')
         categories = [category['name'] for category in video_info.get('genres')]