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Diffstat (limited to 'youtube_dl/extractor/generic.py')
| -rw-r--r-- | youtube_dl/extractor/generic.py | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py new file mode 100644 index 000000000..7a877b3bc --- /dev/null +++ b/youtube_dl/extractor/generic.py @@ -0,0 +1,151 @@ +import os +import re + +from .common import InfoExtractor +from ..utils import ( + compat_urllib_error, + compat_urllib_parse, + compat_urllib_request, + + ExtractorError, +) + +class GenericIE(InfoExtractor): + """Generic last-resort information extractor.""" + + _VALID_URL = r'.*' + IE_NAME = u'generic' + + def report_download_webpage(self, video_id): + """Report webpage download.""" + if not self._downloader.params.get('test', False): + self._downloader.report_warning(u'Falling back on generic information extractor.') + super(GenericIE, self).report_download_webpage(video_id) + + def report_following_redirect(self, new_url): + """Report information extraction.""" + self._downloader.to_screen(u'[redirect] Following redirect to %s' % new_url) + + def _test_redirect(self, url): + """Check if it is a redirect, like url shorteners, in case return the new url.""" + class HeadRequest(compat_urllib_request.Request): + def get_method(self): + return "HEAD" + + class HEADRedirectHandler(compat_urllib_request.HTTPRedirectHandler): + """ + Subclass the HTTPRedirectHandler to make it use our + HeadRequest also on the redirected URL + """ + def redirect_request(self, req, fp, code, msg, headers, newurl): + if code in (301, 302, 303, 307): + newurl = newurl.replace(' ', '%20') + newheaders = dict((k,v) for k,v in req.headers.items() + if k.lower() not in ("content-length", "content-type")) + return HeadRequest(newurl, + headers=newheaders, + origin_req_host=req.get_origin_req_host(), + unverifiable=True) + else: + raise compat_urllib_error.HTTPError(req.get_full_url(), code, msg, headers, fp) + + class HTTPMethodFallback(compat_urllib_request.BaseHandler): + """ + Fallback to GET if HEAD is not allowed (405 HTTP error) + """ + def http_error_405(self, req, fp, code, msg, headers): + fp.read() + fp.close() + + newheaders = dict((k,v) for k,v in req.headers.items() + if k.lower() not in ("content-length", "content-type")) + return self.parent.open(compat_urllib_request.Request(req.get_full_url(), + headers=newheaders, + origin_req_host=req.get_origin_req_host(), + unverifiable=True)) + + # Build our opener + opener = compat_urllib_request.OpenerDirector() + for handler in [compat_urllib_request.HTTPHandler, compat_urllib_request.HTTPDefaultErrorHandler, + HTTPMethodFallback, HEADRedirectHandler, + compat_urllib_request.HTTPErrorProcessor, compat_urllib_request.HTTPSHandler]: + opener.add_handler(handler()) + + response = opener.open(HeadRequest(url)) + if response is None: + raise ExtractorError(u'Invalid URL protocol') + new_url = response.geturl() + + if url == new_url: + return False + + self.report_following_redirect(new_url) + return new_url + + def _real_extract(self, url): + new_url = self._test_redirect(url) + if new_url: return [self.url_result(new_url)] + + video_id = url.split('/')[-1] + try: + webpage = self._download_webpage(url, video_id) + except ValueError: + # since this is the last-resort InfoExtractor, if + # this error is thrown, it'll be thrown here + raise ExtractorError(u'Invalid URL: %s' % url) + + self.report_extraction(video_id) + # Start with something easy: JW Player in SWFObject + mobj = re.search(r'flashvars: [\'"](?:.*&)?file=(http[^\'"&]*)', webpage) + if mobj is None: + # Broaden the search a little bit + mobj = re.search(r'[^A-Za-z0-9]?(?:file|source)=(http[^\'"&]*)', webpage) + if mobj is None: + # Broaden the search a little bit: JWPlayer JS loader + mobj = re.search(r'[^A-Za-z0-9]?file:\s*["\'](http[^\'"&]*)', webpage) + if mobj is None: + # Try to find twitter cards info + mobj = re.search(r'<meta (?:property|name)="twitter:player:stream" (?:content|value)="(.+?)"', webpage) + if mobj is None: + # We look for Open Graph info: + # We have to match any number spaces between elements, some sites try to align them (eg.: statigr.am) + m_video_type = re.search(r'<meta.*?property="og:video:type".*?content="video/(.*?)"', webpage) + # We only look in og:video if the MIME type is a video, don't try if it's a Flash player: + if m_video_type is not None: + mobj = re.search(r'<meta.*?property="og:video".*?content="(.*?)"', webpage) + if mobj is None: + raise ExtractorError(u'Invalid URL: %s' % url) + + # It's possible that one of the regexes + # matched, but returned an empty group: + if mobj.group(1) is None: + raise ExtractorError(u'Invalid URL: %s' % url) + + video_url = compat_urllib_parse.unquote(mobj.group(1)) + video_id = os.path.basename(video_url) + + # here's a fun little line of code for you: + video_extension = os.path.splitext(video_id)[1][1:] + video_id = os.path.splitext(video_id)[0] + + # it's tempting to parse this further, but you would + # have to take into account all the variations like + # Video Title - Site Name + # Site Name | Video Title + # Video Title - Tagline | Site Name + # and so on and so forth; it's just not practical + video_title = self._html_search_regex(r'<title>(.*)</title>', + webpage, u'video title') + + # video uploader is domain name + video_uploader = self._search_regex(r'(?:https?://)?([^/]*)/.*', + url, u'video uploader') + + return [{ + 'id': video_id, + 'url': video_url, + 'uploader': video_uploader, + 'upload_date': None, + 'title': video_title, + 'ext': video_extension, + }] |