Switch to mobile api endpoint to fix 'Unknown error' blockage

See https://github.com/iv-org/invidious/issues/1319#issuecomment-671732646

youtube/channel.py

@@ -16,29 +16,6 @@ import traceback
 import flask
 from flask import request
 
-'''continuation = Proto(
-    Field('optional', 'continuation', 80226972, Proto(
-        Field('optional', 'browse_id', 2, String),
-        Field('optional', 'params', 3, Base64(Proto(
-            Field('optional', 'channel_tab', 2, String),
-            Field('optional', 'sort', 3, ENUM
-            Field('optional', 'page', 15, String),
-        )))
-    ))
-)'''    
-    
-
-'''channel_continuation = Proto(
-    Field('optional', 'pointless_nest', 80226972, Proto(
-        Field('optional', 'channel_id', 2, String),
-        Field('optional', 'continuation_info', 3, Base64(Proto(
-            Field('optional', 'channel_tab', 2, String),
-            Field('optional', 'sort', 3, ENUM
-            Field('optional', 'page', 15, String),
-        )))
-    ))
-)'''
-
 headers_1 = (
     ('Accept', '*/*'),
     ('Accept-Language', 'en-US,en;q=0.5'),
@@ -51,11 +28,8 @@ headers_pbj = (
     ('X-YouTube-Client-Name', '2'),
     ('X-YouTube-Client-Version', '2.20180830'),
 )
-# https://www.youtube.com/browse_ajax?action_continuation=1&direct_render=1&continuation=4qmFsgJAEhhVQzdVY3M0MkZaeTN1WXpqcnF6T0lIc3caJEVnWjJhV1JsYjNNZ0FEZ0JZQUZxQUhvQk1yZ0JBQSUzRCUzRA%3D%3D
+generic_cookie = (('Cookie', 'VISITOR_INFO1_LIVE=8XihrAcN1l4'),)
-# https://www.youtube.com/browse_ajax?ctoken=4qmFsgJAEhhVQzdVY3M0MkZaeTN1WXpqcnF6T0lIc3caJEVnWjJhV1JsYjNNZ0FEZ0JZQUZxQUhvQk1yZ0JBQSUzRCUzRA%3D%3D&continuation=4qmFsgJAEhhVQzdVY3M0MkZaeTN1WXpqcnF6T0lIc3caJEVnWjJhV1JsYjNNZ0FEZ0JZQUZxQUhvQk1yZ0JBQSUzRCUzRA%3D%3D&itct=CDsQybcCIhMIhZi1krTc2wIVjMicCh2HXQnhKJsc
 
-# grid view: 4qmFsgJAEhhVQzdVY3M0MkZaeTN1WXpqcnF6T0lIc3caJEVnWjJhV1JsYjNNZ0FEZ0JZQUZxQUhvQk1yZ0JBQSUzRCUzRA
-# list view: 4qmFsgJCEhhVQzdVY3M0MkZaeTN1WXpqcnF6T0lIc3caJkVnWjJhV1JsYjNNWUF5QUFNQUk0QVdBQmFnQjZBVEs0QVFBJTNE
 # SORT:
 # videos:
 #    Popular - 1
@@ -69,8 +43,38 @@ headers_pbj = (
 # view:
 # grid: 0 or 1
 # list: 2
-def channel_ctoken(channel_id, page, sort, tab, view=1):  
+def channel_ctoken_desktop(channel_id, page, sort, tab, view=1):
+    # see https://github.com/iv-org/invidious/issues/1319#issuecomment-671732646
+    # page > 1 doesn't work when sorting by oldest
+    offset = 30*(int(page) - 1)
+    schema_number = {
+        3: 6307666885028338688,
+        2: 17254859483345278706,
+        1: 16570086088270825023,
+    }[int(sort)]
+    page_token = proto.string(61, proto.unpadded_b64encode(proto.string(1,
+            proto.uint(1, schema_number) + proto.string(2,
+                proto.string(1, proto.unpadded_b64encode(proto.uint(1, offset))
+            )
+        )
+    )))
 
+    tab = proto.string(2, tab )
+    sort = proto.uint(3, int(sort))
+    #page = proto.string(15, str(page) )
+
+    shelf_view = proto.uint(4, 0)
+    view = proto.uint(6, int(view))
+    continuation_info = proto.string(3,
+        proto.percent_b64encode(tab + sort + shelf_view + view + page_token)
+    )
+
+    channel_id = proto.string(2, channel_id )
+    pointless_nest = proto.string(80226972, channel_id + continuation_info)
+
+    return base64.urlsafe_b64encode(pointless_nest).decode('ascii')
+
+def channel_ctoken_mobile(channel_id, page, sort, tab, view=1):
     tab = proto.string(2, tab )
     sort = proto.uint(3, int(sort))
     page = proto.string(15, str(page) )
@@ -85,12 +89,15 @@ def channel_ctoken(channel_id, page, sort, tab, view=1):
     return base64.urlsafe_b64encode(pointless_nest).decode('ascii')
 
 def get_channel_tab(channel_id, page="1", sort=3, tab='videos', view=1, print_status=True):
-    ctoken = channel_ctoken(channel_id, page, sort, tab, view).replace('=', '%3D')
+    ctoken = channel_ctoken_mobile(channel_id, page, sort, tab, view)
-    url = "https://www.youtube.com/browse_ajax?ctoken=" + ctoken
+    ctoken = ctoken.replace('=', '%3D')
+    url = ('https://m.youtube.com/channel/' + channel_id + '/' + tab
+        + '?ctoken=' + ctoken + '&pbj=1')
 
     if print_status:
         print("Sending channel tab ajax request")
-    content = util.fetch_url(url, util.desktop_ua + headers_1, debug_name='channel_tab')
+    content = util.fetch_url(url,
+        util.mobile_ua + headers_pbj + generic_cookie, debug_name='channel_tab')
     if print_status:
         print("Finished recieving channel tab response")
 

youtube/templates/channel.html

@@ -68,6 +68,13 @@
             .item-grid{
                 padding-left: 20px;
             }
+                .item-grid .horizontal-item-box .item{
+                    width:330px;
+                }
+                    .no-description .thumbnail-box{
+                        width: 120px;
+                        height:90px;
+                     }
             .item-list{
                 width:800px;
                 margin: auto;

youtube/yt_data_extract/everything_else.py

@@ -14,12 +14,16 @@ def extract_channel_info(polymer_json, tab):
     if err:
         return {'error': err}
 
-    try:
+
-        microformat = response['microformat']['microformatDataRenderer']
+    metadata = deep_get(response, 'metadata', 'channelMetadataRenderer',
+        default={})
+    if not metadata:
+        metadata = deep_get(response, 'microformat', 'microformatDataRenderer',
+            default={})
 
     # channel doesn't exist or was terminated
     # example terminated channel: https://www.youtube.com/channel/UCnKJeK_r90jDdIuzHXC0Org
-    except KeyError:
+    if not metadata:
         if response.get('alerts'):
             error_string = ' '.join(
                 extract_str(deep_get(alert, 'alertRenderer', 'text'), default='')
@@ -32,7 +36,7 @@ def extract_channel_info(polymer_json, tab):
             for error in response['responseContext']['errors'].get('error', []):
                 if error.get('code') == 'INVALID_VALUE' and error.get('location') == 'browse_id':
                     return {'error': 'This channel does not exist'}
-        return {'error': 'Failure getting microformat'}
+        return {'error': 'Failure getting metadata'}
 
     info = {'error': None}
     info['current_tab'] = tab
@@ -41,15 +45,20 @@ def extract_channel_info(polymer_json, tab):
         'header', 'c4TabbedHeaderRenderer', 'subscriberCountText'))
 
     # stuff from microformat (info given by youtube for every page on channel)
-    info['short_description'] = microformat.get('description')
+    info['short_description'] = metadata.get('description')
-    info['channel_name'] = microformat.get('title')
+    if info['short_description'] and len(info['short_description']) > 730:
-    info['avatar'] = deep_get(microformat, 'thumbnail', 'thumbnails', 0, 'url')
+        info['short_description'] = info['short_description'][0:730] + '...'
-    channel_url = microformat.get('urlCanonical')
+    info['channel_name'] = metadata.get('title')
+    info['avatar'] = multi_deep_get(metadata,
+        ['avatar', 'thumbnails', 0, 'url'],
+        ['thumbnail', 'thumbnails', 0, 'url'],
+    )
+    channel_url = multi_get(metadata, 'urlCanonical', 'channelUrl')
     if channel_url:
         channel_id = get(channel_url.rstrip('/').split('/'), -1)
         info['channel_id'] = channel_id
     else:
-        info['channel_id'] = deep_get(response, 'metadata', 'channelMetadataRenderer', 'externalId')
+        info['channel_id'] = metadata.get('externalId')
     if info['channel_id']:
         info['channel_url'] = 'https://www.youtube.com/channel/' + channel_id
     else: