compat_urllib_parse_unquote breaks google storage signed objects

[legraphista]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2019.09.28
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

$ youtube-dl https://cdn.kamua.com/view/media/4a14378d-7b9c-43b9-aafe-f34e405d32c9 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'https://cdn.kamua.com/view/media/4a14378d-7b9c-43b9-aafe-f34e405d32c9', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.09.12.1
[debug] Python version 2.7.16 (CPython) - Linux-5.0.0-31-generic-x86_64-with-Ubuntu-19.04-disco
[debug] exe versions: ffmpeg N-94689-g3e93d7ce33, ffprobe N-94689-g3e93d7ce33
[debug] Proxy map: {}
[generic] 4a14378d-7b9c-43b9-aafe-f34e405d32c9: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 4a14378d-7b9c-43b9-aafe-f34e405d32c9: Downloading webpage
[generic] 4a14378d-7b9c-43b9-aafe-f34e405d32c9: Extracting information
[download] Downloading playlist: video
[generic] playlist video: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://storage.googleapis.com/kamua-media/4a14378d-7b9c-43b9-aafe-f34e405d32c9/720p.mp4?X-Goog-Algorithm=GOOG4-RSA-SHA256&X-Goog-Credential=kamua-api-storage@kamua-238810.iam.gserviceaccount.com/20191014/auto/storage/goog4_request&X-Goog-Date=20191014T084411Z&X-Goog-Expires=86401&X-Goog-SignedHeaders=host&X-Goog-Signature=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'
ERROR: unable to download video data: HTTP Error 403: Forbidden
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1917, in process_info
    success = dl(filename, info_dict)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1856, in dl
    return fd.download(name, info)
  File "/usr/local/bin/youtube-dl/youtube_dl/downloader/common.py", line 366, in download
    return self.real_download(filename, info_dict)
  File "/usr/local/bin/youtube-dl/youtube_dl/downloader/http.py", line 341, in real_download
    establish_connection()
  File "/usr/local/bin/youtube-dl/youtube_dl/downloader/http.py", line 109, in establish_connection
    ctx.data = self.ydl.urlopen(request)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2229, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python2.7/urllib2.py", line 435, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 548, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 473, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 556, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 403: Forbidden

Description

Page https://cdn.kamua.com/view/media/4a14378d-7b9c-43b9-aafe-f34e405d32c9 contains a URL link to a signed google cloud storage video.
The src of the <video> is https://storage.googleapis.com/kamua-media/4a14378d-7b9c-43b9-aafe-f34e405d32c9%2F720p.mp4?...[signature]... but after the webpage passes through compat_urllib_parse_unquote, the url transforms in https://storage.googleapis.com/kamua-media/4a14378d-7b9c-43b9-aafe-f34e405d32c9/720p.mp4?...[signature]... (%2F -> /) which breaks the signature.

I think the strings in quotes on the webpage should not have their characters escaped