]> Raphaƫl G. Git Repositories - youtubedl/blob - youtube_dl/extractor/generic.py
Fix description of the modularization.
[youtubedl] / youtube_dl / extractor / generic.py
1 import os
2 import re
3
4 from .common import InfoExtractor
5 from ..utils import (
6 compat_urllib_error,
7 compat_urllib_parse,
8 compat_urllib_request,
9
10 ExtractorError,
11 )
12
13 class GenericIE(InfoExtractor):
14 """Generic last-resort information extractor."""
15
16 _VALID_URL = r'.*'
17 IE_NAME = u'generic'
18
19 def report_download_webpage(self, video_id):
20 """Report webpage download."""
21 if not self._downloader.params.get('test', False):
22 self._downloader.report_warning(u'Falling back on generic information extractor.')
23 super(GenericIE, self).report_download_webpage(video_id)
24
25 def report_following_redirect(self, new_url):
26 """Report information extraction."""
27 self._downloader.to_screen(u'[redirect] Following redirect to %s' % new_url)
28
29 def _test_redirect(self, url):
30 """Check if it is a redirect, like url shorteners, in case return the new url."""
31 class HeadRequest(compat_urllib_request.Request):
32 def get_method(self):
33 return "HEAD"
34
35 class HEADRedirectHandler(compat_urllib_request.HTTPRedirectHandler):
36 """
37 Subclass the HTTPRedirectHandler to make it use our
38 HeadRequest also on the redirected URL
39 """
40 def redirect_request(self, req, fp, code, msg, headers, newurl):
41 if code in (301, 302, 303, 307):
42 newurl = newurl.replace(' ', '%20')
43 newheaders = dict((k,v) for k,v in req.headers.items()
44 if k.lower() not in ("content-length", "content-type"))
45 return HeadRequest(newurl,
46 headers=newheaders,
47 origin_req_host=req.get_origin_req_host(),
48 unverifiable=True)
49 else:
50 raise compat_urllib_error.HTTPError(req.get_full_url(), code, msg, headers, fp)
51
52 class HTTPMethodFallback(compat_urllib_request.BaseHandler):
53 """
54 Fallback to GET if HEAD is not allowed (405 HTTP error)
55 """
56 def http_error_405(self, req, fp, code, msg, headers):
57 fp.read()
58 fp.close()
59
60 newheaders = dict((k,v) for k,v in req.headers.items()
61 if k.lower() not in ("content-length", "content-type"))
62 return self.parent.open(compat_urllib_request.Request(req.get_full_url(),
63 headers=newheaders,
64 origin_req_host=req.get_origin_req_host(),
65 unverifiable=True))
66
67 # Build our opener
68 opener = compat_urllib_request.OpenerDirector()
69 for handler in [compat_urllib_request.HTTPHandler, compat_urllib_request.HTTPDefaultErrorHandler,
70 HTTPMethodFallback, HEADRedirectHandler,
71 compat_urllib_request.HTTPErrorProcessor, compat_urllib_request.HTTPSHandler]:
72 opener.add_handler(handler())
73
74 response = opener.open(HeadRequest(url))
75 if response is None:
76 raise ExtractorError(u'Invalid URL protocol')
77 new_url = response.geturl()
78
79 if url == new_url:
80 return False
81
82 self.report_following_redirect(new_url)
83 return new_url
84
85 def _real_extract(self, url):
86 new_url = self._test_redirect(url)
87 if new_url: return [self.url_result(new_url)]
88
89 video_id = url.split('/')[-1]
90 try:
91 webpage = self._download_webpage(url, video_id)
92 except ValueError:
93 # since this is the last-resort InfoExtractor, if
94 # this error is thrown, it'll be thrown here
95 raise ExtractorError(u'Invalid URL: %s' % url)
96
97 self.report_extraction(video_id)
98 # Start with something easy: JW Player in SWFObject
99 mobj = re.search(r'flashvars: [\'"](?:.*&)?file=(http[^\'"&]*)', webpage)
100 if mobj is None:
101 # Broaden the search a little bit
102 mobj = re.search(r'[^A-Za-z0-9]?(?:file|source)=(http[^\'"&]*)', webpage)
103 if mobj is None:
104 # Broaden the search a little bit: JWPlayer JS loader
105 mobj = re.search(r'[^A-Za-z0-9]?file:\s*["\'](http[^\'"&]*)', webpage)
106 if mobj is None:
107 # Try to find twitter cards info
108 mobj = re.search(r'<meta (?:property|name)="twitter:player:stream" (?:content|value)="(.+?)"', webpage)
109 if mobj is None:
110 # We look for Open Graph info:
111 # We have to match any number spaces between elements, some sites try to align them (eg.: statigr.am)
112 m_video_type = re.search(r'<meta.*?property="og:video:type".*?content="video/(.*?)"', webpage)
113 # We only look in og:video if the MIME type is a video, don't try if it's a Flash player:
114 if m_video_type is not None:
115 mobj = re.search(r'<meta.*?property="og:video".*?content="(.*?)"', webpage)
116 if mobj is None:
117 raise ExtractorError(u'Invalid URL: %s' % url)
118
119 # It's possible that one of the regexes
120 # matched, but returned an empty group:
121 if mobj.group(1) is None:
122 raise ExtractorError(u'Invalid URL: %s' % url)
123
124 video_url = compat_urllib_parse.unquote(mobj.group(1))
125 video_id = os.path.basename(video_url)
126
127 # here's a fun little line of code for you:
128 video_extension = os.path.splitext(video_id)[1][1:]
129 video_id = os.path.splitext(video_id)[0]
130
131 # it's tempting to parse this further, but you would
132 # have to take into account all the variations like
133 # Video Title - Site Name
134 # Site Name | Video Title
135 # Video Title - Tagline | Site Name
136 # and so on and so forth; it's just not practical
137 video_title = self._html_search_regex(r'<title>(.*)</title>',
138 webpage, u'video title')
139
140 # video uploader is domain name
141 video_uploader = self._search_regex(r'(?:https?://)?([^/]*)/.*',
142 url, u'video uploader')
143
144 return [{
145 'id': video_id,
146 'url': video_url,
147 'uploader': video_uploader,
148 'upload_date': None,
149 'title': video_title,
150 'ext': video_extension,
151 }]