From e549b5f67c4beff421a2b2b36f3b5031bfe8ed88 Mon Sep 17 00:00:00 2001
From: James Taylor <user234683@users.noreply.github.com>
Date: Fri, 5 Mar 2021 23:27:31 -0800
Subject: Channel: Allow going to next pages of playlists page
MIME-Version: 1.0
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Uses previous and next buttons. Now can view more than just
first page of playlists page

Signed-off-by: Jesús <heckyel@hyperbola.info>
---
 youtube/channel.py                         | 6 +++++-
 youtube/templates/channel.html             | 7 ++++++-
 youtube/yt_data_extract/common.py          | 8 ++++++++
 youtube/yt_data_extract/everything_else.py | 2 +-
 4 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/youtube/channel.py b/youtube/channel.py
index 00e1cf9..69092d3 100644
--- a/youtube/channel.py
+++ b/youtube/channel.py
@@ -280,8 +280,11 @@ def get_channel_page_general_url(base_url, tab, request, channel_id=None):
         number_of_videos, polymer_json = tasks[0].value, tasks[1].value
     elif tab == 'about':
         polymer_json = util.fetch_url(base_url + '/about?pbj=1', headers_desktop, debug_name='gen_channel_about')
-    elif tab == 'playlists':
+    elif tab == 'playlists' and page_number == 1:
         polymer_json = util.fetch_url(base_url+ '/playlists?pbj=1&view=1&sort=' + playlist_sort_codes[sort], headers_desktop, debug_name='gen_channel_playlists')
+    elif tab == 'playlists':
+        polymer_json = get_channel_tab(channel_id, page_number, sort,
+                                       'playlists', view)
     elif tab == 'search' and channel_id:
         polymer_json = get_channel_search_json(channel_id, query, page_number)
     elif tab == 'search':
@@ -304,6 +307,7 @@ def get_channel_page_general_url(base_url, tab, request, channel_id=None):
     elif tab == 'search':
         info['search_box_value'] = query
         info['header_playlist_names'] = local_playlist.get_playlist_names()
+    if tab in ('search', 'playlists'):
         info['page_number'] = page_number
     info['subscribed'] = subscriptions.is_subscribed(info['channel_id'])
 
diff --git a/youtube/templates/channel.html b/youtube/templates/channel.html
index 252d017..294f1df 100644
--- a/youtube/templates/channel.html
+++ b/youtube/templates/channel.html
@@ -78,6 +78,11 @@
                     <div id="number-of-results">{{ number_of_videos }} videos</div>
                 {% elif current_tab == 'playlists' %}
                     {% set sorts = [('2', 'oldest'), ('3', 'newest'), ('4', 'last video added')] %}
+                    {% if items %}
+                        <h2 class="page-number">Page {{ page_number }}</h2>
+                    {% else %}
+                        <h2 class="page-number">No items</h2>
+                    {% endif %}
                 {% elif current_tab == 'search' %}
                     {% if items %}
                         <h2 class="page-number">Page {{ page_number }}</h2>
@@ -113,7 +118,7 @@
                 <nav class="pagination-list">
                     {{ common_elements.page_buttons(number_of_pages, channel_url + '/' + current_tab, parameters_dictionary, include_ends=(current_sort.__str__() == '3')) }}
                 </nav>
-            {% elif current_tab == 'search' %}
+            {% elif current_tab == 'playlists' or current_tab == 'search' %}
                 <nav class="next-previous-button-row">
                     {{ common_elements.next_previous_buttons(is_last_page, channel_url + '/' + current_tab, parameters_dictionary) }}
                 </nav>
diff --git a/youtube/yt_data_extract/common.py b/youtube/yt_data_extract/common.py
index 57a84ed..2b394e6 100644
--- a/youtube/yt_data_extract/common.py
+++ b/youtube/yt_data_extract/common.py
@@ -450,6 +450,14 @@ def extract_items_from_renderer(renderer, item_types=_item_types):
         if key in item_types:
             items.append(renderer)
 
+        # ctoken sometimes placed in these renderers, e.g. channel playlists
+        elif key == 'continuationItemRenderer':
+            cont = deep_get(
+                value, 'continuationEndpoint', 'continuationCommand', 'token'
+            )
+            if cont:
+                ctoken = cont
+
         # has a list in it, add it to the iter stack
         elif get_nested_renderer_list_function(key):
             renderer_list, cont = get_nested_renderer_list_function(key)(value)
diff --git a/youtube/yt_data_extract/everything_else.py b/youtube/yt_data_extract/everything_else.py
index 197cf88..f9c47cb 100644
--- a/youtube/yt_data_extract/everything_else.py
+++ b/youtube/yt_data_extract/everything_else.py
@@ -77,7 +77,7 @@ def extract_channel_info(polymer_json, tab):
         additional_info = {'author': info['channel_name'], 'author_url': info['channel_url']}
         info['items'] = [extract_item_info(renderer, additional_info) for renderer in items]
         info['ctoken'] = ctoken
-        if tab == 'search':
+        if tab in ('search', 'playlists'):
             info['is_last_page'] = (ctoken is None)
     elif tab == 'about':
         items, _ = extract_items(response, item_types={'channelAboutFullMetadataRenderer'})
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