From ff262dadb71b035d5e54496c007a4388fb5c5887 Mon Sep 17 00:00:00 2001
From: girst <tobi@isticktoit.net>
Date: Sun, 4 Oct 2020 15:35:17 +0200
Subject: [PATCH] implement pagination of channel/ucid/playlists (VERY HACKY)

i'm less ashamed of this code as i should be.
---
 app/browse/__init__.py               | 16 +++++++++++++++-
 app/browse/templates/channel.html.j2 |  4 +++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/app/browse/__init__.py b/app/browse/__init__.py
index debc741..b3eea72 100644
--- a/app/browse/__init__.py
+++ b/app/browse/__init__.py
@@ -49,7 +49,7 @@ def channel(channel_id, subpage="videos"):
         sort_by = request.args.get('sort') or "newest"
         query = None
     elif subpage == "playlists":
-        page = None # TODO: cursor
+        page = request.args.get('cursor')
         sort_by = request.args.get('sort', "modified")
         query = None
     elif subpage == "search":
@@ -89,6 +89,20 @@ def channel(channel_id, subpage="videos"):
         """, (channel_id, token))
         (is_subscribed,) = c.fetchone()
 
+    # XXX: ad-hoc protobuf ctoken extractor: This is one big hack that needs to
+    # get cleanded up. Since the ctoken only has fileds with rigid lengths, we
+    # can just extract the bytes at the correct position to get at the cursor
+    # token we need.
+    if subpage == "playlists":
+        page = result[1].get('response',{}).get('continuationContents',{}) \
+            .get('sectionListContinuation',{}).get('continuations',[{}])[0] \
+            .get('nextContinuationData',{}).get('continuation')
+        if page:
+            import base64
+            page = base64.urlsafe_b64decode(page+u'===')[34:]
+            page = base64.urlsafe_b64decode(page+b'===')[21:]
+            page = page[:102].decode('ascii')
+    # end XXX
     return render_template('channel.html.j2',
         title=title,
         subpage=subpage,
diff --git a/app/browse/templates/channel.html.j2 b/app/browse/templates/channel.html.j2
index fe724ca..6f0303b 100644
--- a/app/browse/templates/channel.html.j2
+++ b/app/browse/templates/channel.html.j2
@@ -45,7 +45,9 @@
 {% if not rows|length %}no more results{% endif %}
 
 <div class="pagination-container">
-{% if page is not none %}
+{% if subpage == "playlists" %}
+	{{ macros.pagination("more", {'cursor': page}, +1) if has_more}}
+{% else %}
 	{{ macros.pagination("previous", {'page':(-1,1)}, -1) if page > 1 }}
 	{{ macros.pagination("next", {'page':(+1,1)}, +1) if has_more}}
 {% endif %}
-- 
2.39.3