11 compat_urllib_request,
19 class InfoExtractor(object):
20 """Information Extractor class.
22 Information extractors are the classes that, given a URL, extract
23 information about the video (or videos) the URL refers to. This
24 information includes the real video URL, the video title, author and
25 others. The information is stored in a dictionary which is then
26 passed to the FileDownloader. The FileDownloader processes this
27 information possibly downloading the video to the file system, among
28 other possible outcomes.
30 The dictionaries must include the following fields:
34 title: Video title, unescaped.
35 ext: Video filename extension.
37 The following fields are optional:
39 format: The video format, defaults to ext (used for --get-format)
40 thumbnails: A list of dictionaries (with the entries "resolution" and
41 "url") for the varying thumbnails
42 thumbnail: Full URL to a video thumbnail image.
43 description: One-line video description.
44 uploader: Full name of the video uploader.
45 upload_date: Video upload date (YYYYMMDD).
46 uploader_id: Nickname or id of the video uploader.
47 location: Physical location of the video.
48 player_url: SWF Player URL (used for rtmpdump).
49 subtitles: The subtitle file contents.
50 view_count: How many users have watched the video on the platform.
51 urlhandle: [internal] The urlHandle to be used to download the file,
52 like returned by urllib.request.urlopen
54 The fields should all be Unicode strings.
56 Subclasses of this one should re-define the _real_initialize() and
57 _real_extract() methods and define a _VALID_URL regexp.
58 Probably, they should also be added to the list of extractors.
60 _real_extract() must return a *list* of information dictionaries as
63 Finally, the _WORKING attribute should be set to False for broken IEs
64 in order to warn the users and skip the tests.
71 def __init__(self, downloader=None):
72 """Constructor. Receives an optional downloader."""
74 self.set_downloader(downloader)
77 def suitable(cls, url):
78 """Receives a URL and returns True if suitable for this IE."""
79 return re.match(cls._VALID_URL, url) is not None
83 """Getter method for _WORKING."""
87 """Initializes an instance (authentication, etc)."""
89 self._real_initialize()
92 def extract(self, url):
93 """Extracts URL information and returns it in list of dicts."""
95 return self._real_extract(url)
97 def set_downloader(self, downloader):
98 """Sets the downloader for this IE."""
99 self._downloader = downloader
101 def _real_initialize(self):
102 """Real initialization process. Redefine in subclasses."""
105 def _real_extract(self, url):
106 """Real extraction process. Redefine in subclasses."""
111 """A string for getting the InfoExtractor with get_info_extractor"""
112 return cls.__name__[:-2]
116 return type(self).__name__[:-2]
118 def _request_webpage(self, url_or_request, video_id, note=None, errnote=None):
119 """ Returns the response handle """
121 self.report_download_webpage(video_id)
122 elif note is not False:
123 self.to_screen(u'%s: %s' % (video_id, note))
125 return compat_urllib_request.urlopen(url_or_request)
126 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
128 errnote = u'Unable to download webpage'
129 raise ExtractorError(u'%s: %s' % (errnote, compat_str(err)), sys.exc_info()[2])
131 def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None):
132 """ Returns a tuple (page content as string, URL handle) """
133 urlh = self._request_webpage(url_or_request, video_id, note, errnote)
134 content_type = urlh.headers.get('Content-Type', '')
135 m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type)
137 encoding = m.group(1)
140 webpage_bytes = urlh.read()
141 if self._downloader.params.get('dump_intermediate_pages', False):
143 url = url_or_request.get_full_url()
144 except AttributeError:
146 self.to_screen(u'Dumping request to ' + url)
147 dump = base64.b64encode(webpage_bytes).decode('ascii')
148 self._downloader.to_screen(dump)
149 content = webpage_bytes.decode(encoding, 'replace')
150 return (content, urlh)
152 def _download_webpage(self, url_or_request, video_id, note=None, errnote=None):
153 """ Returns the data of the page as a string """
154 return self._download_webpage_handle(url_or_request, video_id, note, errnote)[0]
156 def to_screen(self, msg):
157 """Print msg to screen, prefixing it with '[ie_name]'"""
158 self._downloader.to_screen(u'[%s] %s' % (self.IE_NAME, msg))
160 def report_extraction(self, id_or_name):
161 """Report information extraction."""
162 self.to_screen(u'%s: Extracting information' % id_or_name)
164 def report_download_webpage(self, video_id):
165 """Report webpage download."""
166 self.to_screen(u'%s: Downloading webpage' % video_id)
168 def report_age_confirmation(self):
169 """Report attempt to confirm age."""
170 self.to_screen(u'Confirming age')
172 def report_login(self):
173 """Report attempt to log in."""
174 self.to_screen(u'Logging in')
176 #Methods for following #608
177 #They set the correct value of the '_type' key
178 def video_result(self, video_info):
179 """Returns a video"""
180 video_info['_type'] = 'video'
182 def url_result(self, url, ie=None):
183 """Returns a url that points to a page that should be processed"""
184 #TODO: ie should be the class used for getting the info
185 video_info = {'_type': 'url',
189 def playlist_result(self, entries, playlist_id=None, playlist_title=None):
190 """Returns a playlist"""
191 video_info = {'_type': 'playlist',
194 video_info['id'] = playlist_id
196 video_info['title'] = playlist_title
199 def _search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
201 Perform a regex search on the given string, using a single or a list of
202 patterns returning the first matching group.
203 In case of failure return a default value or raise a WARNING or a
204 ExtractorError, depending on fatal, specifying the field name.
206 if isinstance(pattern, (str, compat_str, compiled_regex_type)):
207 mobj = re.search(pattern, string, flags)
210 mobj = re.search(p, string, flags)
213 if sys.stderr.isatty() and os.name != 'nt':
214 _name = u'\033[0;34m%s\033[0m' % name
219 # return the first matching group
220 return next(g for g in mobj.groups() if g is not None)
221 elif default is not None:
224 raise ExtractorError(u'Unable to extract %s' % _name)
226 self._downloader.report_warning(u'unable to extract %s; '
227 u'please report this issue on http://yt-dl.org/bug' % _name)
230 def _html_search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
232 Like _search_regex, but strips HTML tags and unescapes entities.
234 res = self._search_regex(pattern, string, name, default, fatal, flags)
236 return clean_html(res).strip()
240 def _get_login_info(self):
242 Get the the login info as (username, password)
243 It will look in the netrc file using the _NETRC_MACHINE value
244 If there's no info available, return (None, None)
246 if self._downloader is None:
251 downloader_params = self._downloader.params
253 # Attempt to use provided username and password or .netrc data
254 if downloader_params.get('username', None) is not None:
255 username = downloader_params['username']
256 password = downloader_params['password']
257 elif downloader_params.get('usenetrc', False):
259 info = netrc.netrc().authenticators(self._NETRC_MACHINE)
264 raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
265 except (IOError, netrc.NetrcParseError) as err:
266 self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err))
268 return (username, password)
270 class SearchInfoExtractor(InfoExtractor):
272 Base class for paged search queries extractors.
273 They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query}
274 Instances should define _SEARCH_KEY and _MAX_RESULTS.
278 def _make_valid_url(cls):
279 return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY
282 def suitable(cls, url):
283 return re.match(cls._make_valid_url(), url) is not None
285 def _real_extract(self, query):
286 mobj = re.match(self._make_valid_url(), query)
288 raise ExtractorError(u'Invalid search query "%s"' % query)
290 prefix = mobj.group('prefix')
291 query = mobj.group('query')
293 return self._get_n_results(query, 1)
294 elif prefix == 'all':
295 return self._get_n_results(query, self._MAX_RESULTS)
299 raise ExtractorError(u'invalid download number %s for query "%s"' % (n, query))
300 elif n > self._MAX_RESULTS:
301 self._downloader.report_warning(u'%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n))
302 n = self._MAX_RESULTS
303 return self._get_n_results(query, n)
305 def _get_n_results(self, query, n):
306 """Get a specified number of results for a query"""
307 raise NotImplementedError("This method must be implemented by sublclasses")
310 def SEARCH_KEY(self):
311 return self._SEARCH_KEY