yt-dlp plugin extractor to decrypt youtube nsig online

Project moved

Moved to https://github.com/pukkandan/YT_NSigProxy

Youtube_NsigProxy.py

"""
SPDX-License-Identifier: MIT https://opensource.org/licenses/MIT
Copyright © 2022 [email protected]

yt-dlp plugin extractor to decrypt youtube nsig online
Needs yt-dlp 2022.09.17 or above

Usage: Import this file in ytdlp_plugins/extractor/__init__.py
See https://github.com/yt-dlp/yt-dlp#plugins for details

Solver Source:
    https://github.com/pukkandan/yt-dlp-online-utils/blob/master/api/youtube/nparams/decrypt.js

Credits: @Lesmiscore for the implementation

Note: The solver has limited resources. Please do not abuse
"""


from yt_dlp.utils import ExtractorError, traverse_obj
from yt_dlp.extractor.youtube import YoutubeIE


SOLVER_URL = 'https://yt-dlp-online-utils.vercel.app/youtube/nparams/decrypt'
PREFER_SOLVER = False  # Whether to prefer online solver over local solver


class Youtube_NsigProxyIE(YoutubeIE, plugin_name='NSIG'):
    def __nsig_error(self, current, next, s, video_id, player_url, e):
        self.report_warning(
            f'{current} nsig extraction failed: Trying with {next}\n'
            f'         n = {s} ; player = {player_url}', video_id)
        self.write_debug(e)

    def _decrypt_nsig(self, s, video_id, player_url):
        fallback = True
        try:
            if not player_url or not PREFER_SOLVER:
                return super()._decrypt_nsig(s, video_id, player_url)
        except Exception as e:
            if not player_url:
                raise
            self.__nsig_error('Local', 'online solver', s, video_id, player_url, e)
            fallback = False

        try:
            response_data = self._download_json(
                SOLVER_URL, video_id, query={'player': player_url, 'n': s},
                note='Requesting nsig decryption from online solver')
            if response_data['status'] != 'ok':
                raise ExtractorError(f'Failed at step "{response_data["step"]}":\n    '
                                     f'{traverse_obj(response_data, ("data", "message"))}')
            self.write_debug(f'Decrypted nsig {s} => {response_data["data"]}')
            return response_data['data']
        except Exception as e:
            if not fallback:
                raise
            self.__nsig_error('Online', 'local solver', s, video_id, player_url, e)
            return super()._decrypt_nsig(s, video_id, player_url)

hm.. The plugin system wasn't really designed with this kind of use-case in mind. I will have to see what can be changed in yt-dlp to make this easier

Everything good with latest commit, except two small things

• small typo "Needs yt-dlp 2021.09.17 or above" => "Needs yt-dlp 2022.09.17 or above"
• nsig always use online solver, even if PREFER_SOLVER = False

@0xcc07c9 Thanks, fixed