If someone is running youtube-dl on a server to deliver files, the user could input 'file:///some/important/file' and youtube-dl would save that file as a video giving access to sensitive information to the user.
'file:' urls can be filtered, but the user can use an URL to a crafted m3u8 manifest like:
#EXTM3U
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:10.0
file:///etc/passwd
#EXT-X-ENDLIST
With this patch 'file:' URLs raise URLError like for unknown protocols.
compat_urllib_request.Request
[downloader/dash] Use sanitized_Request
[downloader/http] Use sanitized_Request
[atresplayer] Use sanitized_Request
[bambuser] Use sanitized_Request
[bliptv] Use sanitized_Request
[brightcove] Use sanitized_Request
[cbs] Use sanitized_Request
[ceskatelevize] Use sanitized_Request
[collegerama] Use sanitized_Request
[extractor/common] Use sanitized_Request
[crunchyroll] Use sanitized_Request
[dailymotion] Use sanitized_Request
[dcn] Use sanitized_Request
[dramafever] Use sanitized_Request
[dumpert] Use sanitized_Request
[eitb] Use sanitized_Request
[escapist] Use sanitized_Request
[everyonesmixtape] Use sanitized_Request
[extremetube] Use sanitized_Request
[facebook] Use sanitized_Request
[fc2] Use sanitized_Request
[flickr] Use sanitized_Request
[4tube] Use sanitized_Request
[gdcvault] Use sanitized_Request
[extractor/generic] Use sanitized_Request
[hearthisat] Use sanitized_Request
[hotnewhiphop] Use sanitized_Request
[hypem] Use sanitized_Request
[iprima] Use sanitized_Request
[ivi] Use sanitized_Request
[keezmovies] Use sanitized_Request
[letv] Use sanitized_Request
[lynda] Use sanitized_Request
[metacafe] Use sanitized_Request
[minhateca] Use sanitized_Request
[miomio] Use sanitized_Request
[meovideo] Use sanitized_Request
[mofosex] Use sanitized_Request
[moniker] Use sanitized_Request
[mooshare] Use sanitized_Request
[movieclips] Use sanitized_Request
[mtv] Use sanitized_Request
[myvideo] Use sanitized_Request
[neteasemusic] Use sanitized_Request
[nfb] Use sanitized_Request
[niconico] Use sanitized_Request
[noco] Use sanitized_Request
[nosvideo] Use sanitized_Request
[novamov] Use sanitized_Request
[nowness] Use sanitized_Request
[nuvid] Use sanitized_Request
[played] Use sanitized_Request
[pluralsight] Use sanitized_Request
[pornhub] Use sanitized_Request
[pornotube] Use sanitized_Request
[primesharetv] Use sanitized_Request
[promptfile] Use sanitized_Request
[qqmusic] Use sanitized_Request
[rtve] Use sanitized_Request
[safari] Use sanitized_Request
[sandia] Use sanitized_Request
[shared] Use sanitized_Request
[sharesix] Use sanitized_Request
[sina] Use sanitized_Request
[smotri] Use sanitized_Request
[sohu] Use sanitized_Request
[spankwire] Use sanitized_Request
[sportdeutschland] Use sanitized_Request
[streamcloud] Use sanitized_Request
[streamcz] Use sanitized_Request
[tapely] Use sanitized_Request
[tube8] Use sanitized_Request
[tubitv] Use sanitized_Request
[twitch] Use sanitized_Request
[twitter] Use sanitized_Request
[udemy] Use sanitized_Request
[vbox7] Use sanitized_Request
[veoh] Use sanitized_Request
[vessel] Use sanitized_Request
[vevo] Use sanitized_Request
[viddler] Use sanitized_Request
[videomega] Use sanitized_Request
[viewvster] Use sanitized_Request
[viki] Use sanitized_Request
[vk] Use sanitized_Request
[vodlocker] Use sanitized_Request
[voicerepublic] Use sanitized_Request
[wistia] Use sanitized_Request
[xfileshare] Use sanitized_Request
[xtube] Use sanitized_Request
[xvideos] Use sanitized_Request
[yandexmusic] Use sanitized_Request
[youku] Use sanitized_Request
[youporn] Use sanitized_Request
[youtube] Use sanitized_Request
[patreon] Use sanitized_Request
[extractor/common] Remove unused import
[nfb] PEP 8
When using 'bestvideo/best,bestaudio', 'bestvideo/best' must be set as the current_selector (instead of appending it to the selectors), otherwise when it gets the ',' it would append 'None' to the selectors.
'bestvideo+bestaudio/best' was incorrectly interpreted as 'bestvideo+(bestaudio/best)', so it would fail if 'bestaudio' doesn't exist instead of falling back to 'best'.
The spec string is processed using 'tokenize.tokenize' to split it in words and operators, the filters are still processed using regular expressions.
This should make easier to allow grouping operators with parens.
