Add minor API fixes

src/invidious/channels.cr

@@ -260,6 +260,132 @@ def produce_channel_videos_url(ucid, page = 1, auto_generated = nil, sort_by = "
   return url
 end
 
+def produce_channel_playlists_url(ucid, cursor, sort = "newest", auto_generated = false)
+  if !auto_generated
+    cursor = Base64.urlsafe_encode(cursor, false)
+  end
+
+  meta = IO::Memory.new
+
+  if auto_generated
+    meta.write(Bytes[0x08, 0x0a])
+  end
+
+  meta.write(Bytes[0x12, 0x09])
+  meta.print("playlists")
+
+  if auto_generated
+    meta.write(Bytes[0x20, 0x32])
+  else
+    # TODO: Look at 0x01, 0x00
+    case sort
+    when "oldest", "oldest_created"
+      meta.write(Bytes[0x18, 0x02])
+    when "newest", "newest_created"
+      meta.write(Bytes[0x18, 0x03])
+    when "last", "last_added"
+      meta.write(Bytes[0x18, 0x04])
+    end
+
+    meta.write(Bytes[0x20, 0x01])
+  end
+
+  meta.write(Bytes[0x30, 0x02])
+  meta.write(Bytes[0x38, 0x01])
+  meta.write(Bytes[0x60, 0x01])
+  meta.write(Bytes[0x6a, 0x00])
+
+  meta.write(Bytes[0x7a, cursor.size])
+  meta.print(cursor)
+
+  meta.write(Bytes[0xb8, 0x01, 0x00])
+
+  meta.rewind
+  meta = Base64.urlsafe_encode(meta.to_slice)
+  meta = URI.escape(meta)
+
+  continuation = IO::Memory.new
+  continuation.write(Bytes[0x12, ucid.size])
+  continuation.print(ucid)
+
+  continuation.write(Bytes[0x1a])
+  continuation.write(write_var_int(meta.size))
+  continuation.print(meta)
+
+  continuation.rewind
+  continuation = continuation.gets_to_end
+
+  wrapper = IO::Memory.new
+  wrapper.write(Bytes[0xe2, 0xa9, 0x85, 0xb2, 0x02])
+  wrapper.write(write_var_int(continuation.size))
+  wrapper.print(continuation)
+  wrapper.rewind
+
+  wrapper = Base64.urlsafe_encode(wrapper.to_slice)
+  wrapper = URI.escape(wrapper)
+
+  url = "/browse_ajax?continuation=#{wrapper}&gl=US&hl=en"
+
+  return url
+end
+
+def extract_channel_playlists_cursor(url, auto_generated)
+  wrapper = HTTP::Params.parse(URI.parse(url).query.not_nil!)["continuation"]
+
+  wrapper = URI.unescape(wrapper)
+  wrapper = Base64.decode(wrapper)
+
+  # 0xe2 0xa9 0x85 0xb2 0x02
+  wrapper += 5
+
+  continuation_size = read_var_int(wrapper[0, 4])
+  wrapper += write_var_int(continuation_size).size
+  continuation = wrapper[0, continuation_size]
+
+  # 0x12
+  continuation += 1
+  ucid_size = continuation[0]
+  continuation += 1
+  ucid = continuation[0, ucid_size]
+  continuation += ucid_size
+
+  # 0x1a
+  continuation += 1
+  meta_size = read_var_int(continuation[0, 4])
+  continuation += write_var_int(meta_size).size
+  meta = continuation[0, meta_size]
+  continuation += meta_size
+
+  meta = String.new(meta)
+  meta = URI.unescape(meta)
+  meta = Base64.decode(meta)
+
+  # 0x12 0x09 playlists
+  meta += 11
+
+  until meta[0] == 0x7a
+    tag = read_var_int(meta[0, 4])
+    meta += write_var_int(tag).size
+    value = meta[0]
+    meta += 1
+  end
+
+  # 0x7a
+  meta += 1
+  cursor_size = meta[0]
+  meta += 1
+  cursor = meta[0, cursor_size]
+
+  cursor = String.new(cursor)
+
+  if !auto_generated
+    cursor = URI.unescape(cursor)
+    cursor = Base64.decode_string(cursor)
+  end
+
+  return cursor
+end
+
 def get_about_info(ucid, locale)
   client = make_client(YT_URL)
 
@@ -290,7 +416,7 @@ def get_about_info(ucid, locale)
   sub_count ||= 0
 
   author = about.xpath_node(%q(//span[contains(@class,"qualified-channel-title-text")]/a)).not_nil!.content
-  ucid = about.xpath_node(%q(//link[@rel="canonical"])).not_nil!["href"].split("/")[-1]
+  ucid = about.xpath_node(%q(//meta[@itemprop="channelId"])).not_nil!["content"]
 
   # Auto-generated channels
   # https://support.google.com/youtube/answer/2579942