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 thumbnail: Full URL to a video thumbnail image.
41 description: One-line video description.
42 uploader: Full name of the video uploader.
43 upload_date: Video upload date (YYYYMMDD).
44 uploader_id: Nickname or id of the video uploader.
45 location: Physical location of the video.
46 player_url: SWF Player URL (used for rtmpdump).
47 subtitles: The subtitle file contents.
48 view_count: How many users have watched the video on the platform.
49 urlhandle: [internal] The urlHandle to be used to download the file,
50 like returned by urllib.request.urlopen
52 The fields should all be Unicode strings.
54 Subclasses of this one should re-define the _real_initialize() and
55 _real_extract() methods and define a _VALID_URL regexp.
56 Probably, they should also be added to the list of extractors.
58 _real_extract() must return a *list* of information dictionaries as
61 Finally, the _WORKING attribute should be set to False for broken IEs
62 in order to warn the users and skip the tests.
69 def __init__(self, downloader=None):
70 """Constructor. Receives an optional downloader."""
72 self.set_downloader(downloader)
75 def suitable(cls, url):
76 """Receives a URL and returns True if suitable for this IE."""
77 return re.match(cls._VALID_URL, url) is not None
81 """Getter method for _WORKING."""
85 """Initializes an instance (authentication, etc)."""
87 self._real_initialize()
90 def extract(self, url):
91 """Extracts URL information and returns it in list of dicts."""
93 return self._real_extract(url)
95 def set_downloader(self, downloader):
96 """Sets the downloader for this IE."""
97 self._downloader = downloader
99 def _real_initialize(self):
100 """Real initialization process. Redefine in subclasses."""
103 def _real_extract(self, url):
104 """Real extraction process. Redefine in subclasses."""
109 return type(self).__name__[:-2]
111 def _request_webpage(self, url_or_request, video_id, note=None, errnote=None):
112 """ Returns the response handle """
114 self.report_download_webpage(video_id)
115 elif note is not False:
116 self.to_screen(u'%s: %s' % (video_id, note))
118 return compat_urllib_request.urlopen(url_or_request)
119 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
121 errnote = u'Unable to download webpage'
122 raise ExtractorError(u'%s: %s' % (errnote, compat_str(err)), sys.exc_info()[2])
124 def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None):
125 """ Returns a tuple (page content as string, URL handle) """
126 urlh = self._request_webpage(url_or_request, video_id, note, errnote)
127 content_type = urlh.headers.get('Content-Type', '')
128 m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type)
130 encoding = m.group(1)
133 webpage_bytes = urlh.read()
134 if self._downloader.params.get('dump_intermediate_pages', False):
136 url = url_or_request.get_full_url()
137 except AttributeError:
139 self.to_screen(u'Dumping request to ' + url)
140 dump = base64.b64encode(webpage_bytes).decode('ascii')
141 self._downloader.to_screen(dump)
142 content = webpage_bytes.decode(encoding, 'replace')
143 return (content, urlh)
145 def _download_webpage(self, url_or_request, video_id, note=None, errnote=None):
146 """ Returns the data of the page as a string """
147 return self._download_webpage_handle(url_or_request, video_id, note, errnote)[0]
149 def to_screen(self, msg):
150 """Print msg to screen, prefixing it with '[ie_name]'"""
151 self._downloader.to_screen(u'[%s] %s' % (self.IE_NAME, msg))
153 def report_extraction(self, id_or_name):
154 """Report information extraction."""
155 self.to_screen(u'%s: Extracting information' % id_or_name)
157 def report_download_webpage(self, video_id):
158 """Report webpage download."""
159 self.to_screen(u'%s: Downloading webpage' % video_id)
161 def report_age_confirmation(self):
162 """Report attempt to confirm age."""
163 self.to_screen(u'Confirming age')
165 def report_login(self):
166 """Report attempt to log in."""
167 self.to_screen(u'Logging in')
169 #Methods for following #608
170 #They set the correct value of the '_type' key
171 def video_result(self, video_info):
172 """Returns a video"""
173 video_info['_type'] = 'video'
175 def url_result(self, url, ie=None):
176 """Returns a url that points to a page that should be processed"""
177 #TODO: ie should be the class used for getting the info
178 video_info = {'_type': 'url',
182 def playlist_result(self, entries, playlist_id=None, playlist_title=None):
183 """Returns a playlist"""
184 video_info = {'_type': 'playlist',
187 video_info['id'] = playlist_id
189 video_info['title'] = playlist_title
192 def _search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
194 Perform a regex search on the given string, using a single or a list of
195 patterns returning the first matching group.
196 In case of failure return a default value or raise a WARNING or a
197 ExtractorError, depending on fatal, specifying the field name.
199 if isinstance(pattern, (str, compat_str, compiled_regex_type)):
200 mobj = re.search(pattern, string, flags)
203 mobj = re.search(p, string, flags)
206 if sys.stderr.isatty() and os.name != 'nt':
207 _name = u'\033[0;34m%s\033[0m' % name
212 # return the first matching group
213 return next(g for g in mobj.groups() if g is not None)
214 elif default is not None:
217 raise ExtractorError(u'Unable to extract %s' % _name)
219 self._downloader.report_warning(u'unable to extract %s; '
220 u'please report this issue on http://yt-dl.org/bug' % _name)
223 def _html_search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
225 Like _search_regex, but strips HTML tags and unescapes entities.
227 res = self._search_regex(pattern, string, name, default, fatal, flags)
229 return clean_html(res).strip()
233 def _get_login_info(self):
235 Get the the login info as (username, password)
236 It will look in the netrc file using the _NETRC_MACHINE value
237 If there's no info available, return (None, None)
239 if self._downloader is None:
244 downloader_params = self._downloader.params
246 # Attempt to use provided username and password or .netrc data
247 if downloader_params.get('username', None) is not None:
248 username = downloader_params['username']
249 password = downloader_params['password']
250 elif downloader_params.get('usenetrc', False):
252 info = netrc.netrc().authenticators(self._NETRC_MACHINE)
257 raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
258 except (IOError, netrc.NetrcParseError) as err:
259 self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err))
261 return (username, password)
263 class SearchInfoExtractor(InfoExtractor):
265 Base class for paged search queries extractors.
266 They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query}
267 Instances should define _SEARCH_KEY and _MAX_RESULTS.
271 def _make_valid_url(cls):
272 return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY
275 def suitable(cls, url):
276 return re.match(cls._make_valid_url(), url) is not None
278 def _real_extract(self, query):
279 mobj = re.match(self._make_valid_url(), query)
281 raise ExtractorError(u'Invalid search query "%s"' % query)
283 prefix = mobj.group('prefix')
284 query = mobj.group('query')
286 return self._get_n_results(query, 1)
287 elif prefix == 'all':
288 return self._get_n_results(query, self._MAX_RESULTS)
292 raise ExtractorError(u'invalid download number %s for query "%s"' % (n, query))
293 elif n > self._MAX_RESULTS:
294 self._downloader.report_warning(u'%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n))
295 n = self._MAX_RESULTS
296 return self._get_n_results(query, n)
298 def _get_n_results(self, query, n):
299 """Get a specified number of results for a query"""
300 raise NotImplementedError("This method must be implemented by sublclasses")
303 def SEARCH_KEY(self):
304 return self._SEARCH_KEY