Add produce_channel_playlists_url

spec/helpers_spec.cr

@@ -16,9 +16,9 @@ describe "Helpers" do
 
       produce_channel_videos_url(ucid: "UCXuqSBlHAE6Xw-yeJA0Tunw", page: 20).should eq("/browse_ajax?continuation=4qmFsgJEEhhVQ1h1cVNCbEhBRTZYdy15ZUpBMFR1bncaKEVnWjJhV1JsYjNNd0FqZ0JZQUZxQUxnQkFDQUFlZ0l5TUElM0QlM0Q%3D&gl=US&hl=en")
 
-      produce_channel_videos_url(ucid: "UC-9-kyTW8ZkZNDHQJ6FgpwQ", auto_generated: true).should eq("/browse_ajax?continuation=4qmFsgJIEhhVQy05LWt5VFc4WmtaTkRIUUo2Rmdwd1EaLEVnWjJhV1JsYjNNd0FqZ0JZQUZxQUxnQkFDQTJlZ294TlRRNU5qQXpOelE1&gl=US&hl=en")
+      produce_channel_videos_url(ucid: "UC-9-kyTW8ZkZNDHQJ6FgpwQ", auto_generated: true).should eq("/browse_ajax?continuation=4qmFsgJIEhhVQy05LWt5VFc4WmtaTkRIUUo2Rmdwd1EaLEVnWjJhV1JsYjNNd0FqZ0JZQUZxQUxnQkFDQTJlZ294TlRVeU1ESXlPVFE1&gl=US&hl=en")
 
-      produce_channel_videos_url(ucid: "UC-9-kyTW8ZkZNDHQJ6FgpwQ", page: 20, auto_generated: true, sort_by: "popular").should eq("/browse_ajax?continuation=4qmFsgJOEhhVQy05LWt5VFc4WmtaTkRIUUo2Rmdwd1EaMkVnWjJhV1JsYjNNd0FqZ0JZQUZxQUxnQkFDQTJlZ294TkRrNU5Ea3hOelE1R0FFJTNE&gl=US&hl=en")
+      produce_channel_videos_url(ucid: "UC-9-kyTW8ZkZNDHQJ6FgpwQ", page: 20, auto_generated: true, sort_by: "popular").should eq("/browse_ajax?continuation=4qmFsgJOEhhVQy05LWt5VFc4WmtaTkRIUUo2Rmdwd1EaMkVnWjJhV1JsYjNNd0FqZ0JZQUZxQUxnQkFDQTJlZ294TlRBeU1UY3dNVFE1R0FFJTNE&gl=US&hl=en")
     end
   end
 

src/invidious/channels.cr

@@ -218,7 +218,8 @@ def produce_channel_videos_url(ucid, page = 1, auto_generated = nil, sort_by = "
   meta.write(Bytes[0x6a, 0x00])
   meta.write(Bytes[0xb8, 0x01, 0x00])
 
-  meta.write(Bytes[0x20, switch, 0x7a, page.size])
+  meta.write(Bytes[0x20, switch])
+  meta.write(Bytes[0x7a, page.size])
   meta.print(page)
 
   case sort_by

src/invidious/helpers/utils.cr

@@ -240,21 +240,21 @@ def get_referer(env, fallback = "/")
 end
 
 def read_var_int(bytes)
-  numRead = 0
+  num_read = 0
   result = 0
 
-  read = bytes[numRead]
+  read = bytes[num_read]
 
   if bytes.size == 1
     result = bytes[0].to_i32
   else
     while ((read & 0b10000000) != 0)
-      read = bytes[numRead].to_u64
+      read = bytes[num_read].to_u64
       value = (read & 0b01111111)
-      result |= (value << (7 * numRead))
+      result |= (value << (7 * num_read))
 
-      numRead += 1
+      num_read += 1
-      if numRead > 5
+      if num_read > 5
         raise "VarInt is too big"
       end
     end

src/invidious/playlists.cr

@@ -161,6 +161,117 @@ def produce_playlist_url(id, index)
   return url
 end
 
+def produce_channel_playlists_url(ucid, cursor, sort = "newest")
+  cursor = Base64.urlsafe_encode(cursor, false)
+
+  meta = IO::Memory.new
+  meta.write(Bytes[0x12, 0x09])
+  meta.print("playlists")
+
+  # 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])
+  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)
+  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)
+  cursor = URI.unescape(cursor)
+  cursor = Base64.decode_string(cursor)
+
+  return cursor
+end
+
 def fetch_playlist(plid, locale)
   client = make_client(YT_URL)