Generate params strings in code

[kuylar]

Most params strings are just base64 encoded protobufs, and we can definitely use them in places such as:

• [Generating search filter params in code using Protobuf #23] Search Filters
• Search continuations
  • this one will be hard, from what ive seen so far, theres an int value that acts as a hash
• Channel/Playlist continuations
• Comments
  • Instead of GetVideoCommentsAsync(string continuation) we can have GetVideoCommentsAsync(string videoId, CommentSortingType /* enum, TopComments or NewestFirst */ sortingType, object /* needs more research */ after)

& probably more!

[kuylar]

Almost implemented channel continuations, but after implementing it for the videos tab i realized that every other tab's pagination is fucking stupidly complicated. leaving this protobuf for channel continuations here, for future me

// Channel Continuation
// I hate this one *so* much

message ChannelContinuationContainer {
  required ChannelContinuation PaginationInfo = 80226972;
}

message ChannelContinuation {
  required string ChannelId = 2;
  required string ContinuationInfoEncoded = 3;
}

// :3 fuck you youtube
message ChannelContinuationInfoContainer {
  optional ChannelContinuationInfoContainer Second = 3;
  optional ChannelContinuationInfo Third = 15;
  optional ChannelContinuationInfoContainer First = 110;
}

message ChannelContinuationInfo {
  enum SortOrder {
    LATEST = 1;
    POPULAR = 2;
    OLDEST = 3;
  }

  required SortOrder Sort = 3;
  required ChannelPaginationMetadata Metadata = 1;
}

message ChannelPaginationMetadata {
  required string SkipAmountEncoded = 1;
  required string SessionUUID = 2;
}

message SkipAmountContainer {
  required SkipAmountEncodedContainer Skip = 1;
  required int32 Zero = 2;
}

message SkipAmountEncodedContainer {
  required string SkipAmountEncoded = 1;
}

message SkipAmount {
  required string SkipAmount = 2;
}

message SkipAmountInt {
  required int32 Amount = 1;
}

also this snippet for getting a valid continuation from that protobuf

public static string PackChannelContinuation(string channelId, ChannelContinuationInfo.Types.SortOrder sortOrder, int skipAmount)
{
	SkipAmountInt amount = new()
	{
		Amount = skipAmount
	};

	SkipAmount skipAmountProto = new()
	{
		SkipAmount_ = $"ST:{ToBase64UrlString(amount.ToByteArray())}"
	};

	SkipAmountContainer skipContainer = new()
	{
		Zero = 0,
		Skip = new SkipAmountEncodedContainer
		{
			SkipAmountEncoded = ToBase64UrlString(skipAmountProto.ToByteArray())
		}
	};

	ChannelContinuationInfoContainer infoContainer = new()
	{
		First = new ChannelContinuationInfoContainer
		{
			Second = new ChannelContinuationInfoContainer
			{
				Third = new ChannelContinuationInfo
				{
					Sort = sortOrder,
					Metadata = new ChannelPaginationMetadata
					{
						SkipAmountEncoded = ToBase64UrlString(skipContainer.ToByteArray()),
						SessionUUID = Guid.NewGuid().ToString()
					}
				}
			}
		}
	};

	ChannelContinuationContainer final = new()
	{
		PaginationInfo = new ChannelContinuation
		{
			ChannelId = channelId,
			ContinuationInfoEncoded = ToBase64UrlString(infoContainer.ToByteArray())
		}
	};

	return ToBase64UrlString(final.ToByteArray());
}