Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/extractor/common.py

   1 import base64
   2 import os
   3 import re
   4 import socket
   5 import sys
   6
   7 from ..utils import (
   8     compat_http_client,
   9     compat_urllib_error,
  10     compat_urllib_request,
  11     compat_str,
  12
  13     clean_html,
  14     compiled_regex_type,
  15     ExtractorError,
  16 )
  17
  18 class InfoExtractor(object):
  19     """Information Extractor class.
  20
  21     Information extractors are the classes that, given a URL, extract
  22     information about the video (or videos) the URL refers to. This
  23     information includes the real video URL, the video title, author and
  24     others. The information is stored in a dictionary which is then
  25     passed to the FileDownloader. The FileDownloader processes this
  26     information possibly downloading the video to the file system, among
  27     other possible outcomes.
  28
  29     The dictionaries must include the following fields:
  30
  31     id:             Video identifier.
  32     url:            Final video URL.
  33     title:          Video title, unescaped.
  34     ext:            Video filename extension.
  35
  36     The following fields are optional:
  37
  38     format:         The video format, defaults to ext (used for --get-format)
  39     thumbnail:      Full URL to a video thumbnail image.
  40     description:    One-line video description.
  41     uploader:       Full name of the video uploader.
  42     upload_date:    Video upload date (YYYYMMDD).
  43     uploader_id:    Nickname or id of the video uploader.
  44     location:       Physical location of the video.
  45     player_url:     SWF Player URL (used for rtmpdump).
  46     subtitles:      The subtitle file contents.
  47     view_count:     How many users have watched the video on the platform.
  48     urlhandle:      [internal] The urlHandle to be used to download the file,
  49                     like returned by urllib.request.urlopen
  50
  51     The fields should all be Unicode strings.
  52
  53     Subclasses of this one should re-define the _real_initialize() and
  54     _real_extract() methods and define a _VALID_URL regexp.
  55     Probably, they should also be added to the list of extractors.
  56
  57     _real_extract() must return a *list* of information dictionaries as
  58     described above.
  59
  60     Finally, the _WORKING attribute should be set to False for broken IEs
  61     in order to warn the users and skip the tests.
  62     """
  63
  64     _ready = False
  65     _downloader = None
  66     _WORKING = True
  67
  68     def __init__(self, downloader=None):
  69         """Constructor. Receives an optional downloader."""
  70         self._ready = False
  71         self.set_downloader(downloader)
  72
  73     @classmethod
  74     def suitable(cls, url):
  75         """Receives a URL and returns True if suitable for this IE."""
  76         return re.match(cls._VALID_URL, url) is not None
  77
  78     @classmethod
  79     def working(cls):
  80         """Getter method for _WORKING."""
  81         return cls._WORKING
  82
  83     def initialize(self):
  84         """Initializes an instance (authentication, etc)."""
  85         if not self._ready:
  86             self._real_initialize()
  87             self._ready = True
  88
  89     def extract(self, url):
  90         """Extracts URL information and returns it in list of dicts."""
  91         self.initialize()
  92         return self._real_extract(url)
  93
  94     def set_downloader(self, downloader):
  95         """Sets the downloader for this IE."""
  96         self._downloader = downloader
  97
  98     def _real_initialize(self):
  99         """Real initialization process. Redefine in subclasses."""
 100         pass
 101
 102     def _real_extract(self, url):
 103         """Real extraction process. Redefine in subclasses."""
 104         pass
 105
 106     @property
 107     def IE_NAME(self):
 108         return type(self).__name__[:-2]
 109
 110     def _request_webpage(self, url_or_request, video_id, note=None, errnote=None):
 111         """ Returns the response handle """
 112         if note is None:
 113             self.report_download_webpage(video_id)
 114         elif note is not False:
 115             self.to_screen(u'%s: %s' % (video_id, note))
 116         try:
 117             return compat_urllib_request.urlopen(url_or_request)
 118         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 119             if errnote is None:
 120                 errnote = u'Unable to download webpage'
 121             raise ExtractorError(u'%s: %s' % (errnote, compat_str(err)), sys.exc_info()[2])
 122
 123     def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None):
 124         """ Returns a tuple (page content as string, URL handle) """
 125         urlh = self._request_webpage(url_or_request, video_id, note, errnote)
 126         content_type = urlh.headers.get('Content-Type', '')
 127         m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type)
 128         if m:
 129             encoding = m.group(1)
 130         else:
 131             encoding = 'utf-8'
 132         webpage_bytes = urlh.read()
 133         if self._downloader.params.get('dump_intermediate_pages', False):
 134             try:
 135                 url = url_or_request.get_full_url()
 136             except AttributeError:
 137                 url = url_or_request
 138             self.to_screen(u'Dumping request to ' + url)
 139             dump = base64.b64encode(webpage_bytes).decode('ascii')
 140             self._downloader.to_screen(dump)
 141         content = webpage_bytes.decode(encoding, 'replace')
 142         return (content, urlh)
 143
 144     def _download_webpage(self, url_or_request, video_id, note=None, errnote=None):
 145         """ Returns the data of the page as a string """
 146         return self._download_webpage_handle(url_or_request, video_id, note, errnote)[0]
 147
 148     def to_screen(self, msg):
 149         """Print msg to screen, prefixing it with '[ie_name]'"""
 150         self._downloader.to_screen(u'[%s] %s' % (self.IE_NAME, msg))
 151
 152     def report_extraction(self, id_or_name):
 153         """Report information extraction."""
 154         self.to_screen(u'%s: Extracting information' % id_or_name)
 155
 156     def report_download_webpage(self, video_id):
 157         """Report webpage download."""
 158         self.to_screen(u'%s: Downloading webpage' % video_id)
 159
 160     def report_age_confirmation(self):
 161         """Report attempt to confirm age."""
 162         self.to_screen(u'Confirming age')
 163
 164     #Methods for following #608
 165     #They set the correct value of the '_type' key
 166     def video_result(self, video_info):
 167         """Returns a video"""
 168         video_info['_type'] = 'video'
 169         return video_info
 170     def url_result(self, url, ie=None):
 171         """Returns a url that points to a page that should be processed"""
 172         #TODO: ie should be the class used for getting the info
 173         video_info = {'_type': 'url',
 174                       'url': url,
 175                       'ie_key': ie}
 176         return video_info
 177     def playlist_result(self, entries, playlist_id=None, playlist_title=None):
 178         """Returns a playlist"""
 179         video_info = {'_type': 'playlist',
 180                       'entries': entries}
 181         if playlist_id:
 182             video_info['id'] = playlist_id
 183         if playlist_title:
 184             video_info['title'] = playlist_title
 185         return video_info
 186
 187     def _search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
 188         """
 189         Perform a regex search on the given string, using a single or a list of
 190         patterns returning the first matching group.
 191         In case of failure return a default value or raise a WARNING or a
 192         ExtractorError, depending on fatal, specifying the field name.
 193         """
 194         if isinstance(pattern, (str, compat_str, compiled_regex_type)):
 195             mobj = re.search(pattern, string, flags)
 196         else:
 197             for p in pattern:
 198                 mobj = re.search(p, string, flags)
 199                 if mobj: break
 200
 201         if sys.stderr.isatty() and os.name != 'nt':
 202             _name = u'\033[0;34m%s\033[0m' % name
 203         else:
 204             _name = name
 205
 206         if mobj:
 207             # return the first matching group
 208             return next(g for g in mobj.groups() if g is not None)
 209         elif default is not None:
 210             return default
 211         elif fatal:
 212             raise ExtractorError(u'Unable to extract %s' % _name)
 213         else:
 214             self._downloader.report_warning(u'unable to extract %s; '
 215                 u'please report this issue on http://yt-dl.org/bug' % _name)
 216             return None
 217
 218     def _html_search_regex(self, pattern, string, name, default=None, fatal=True, flags=0):
 219         """
 220         Like _search_regex, but strips HTML tags and unescapes entities.
 221         """
 222         res = self._search_regex(pattern, string, name, default, fatal, flags)
 223         if res:
 224             return clean_html(res).strip()
 225         else:
 226             return res
 227
 228 class SearchInfoExtractor(InfoExtractor):
 229     """
 230     Base class for paged search queries extractors.
 231     They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query}
 232     Instances should define _SEARCH_KEY and _MAX_RESULTS.
 233     """
 234
 235     @classmethod
 236     def _make_valid_url(cls):
 237         return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY
 238
 239     @classmethod
 240     def suitable(cls, url):
 241         return re.match(cls._make_valid_url(), url) is not None
 242
 243     def _real_extract(self, query):
 244         mobj = re.match(self._make_valid_url(), query)
 245         if mobj is None:
 246             raise ExtractorError(u'Invalid search query "%s"' % query)
 247
 248         prefix = mobj.group('prefix')
 249         query = mobj.group('query')
 250         if prefix == '':
 251             return self._get_n_results(query, 1)
 252         elif prefix == 'all':
 253             return self._get_n_results(query, self._MAX_RESULTS)
 254         else:
 255             n = int(prefix)
 256             if n <= 0:
 257                 raise ExtractorError(u'invalid download number %s for query "%s"' % (n, query))
 258             elif n > self._MAX_RESULTS:
 259                 self._downloader.report_warning(u'%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n))
 260                 n = self._MAX_RESULTS
 261             return self._get_n_results(query, n)
 262
 263     def _get_n_results(self, query, n):
 264         """Get a specified number of results for a query"""
 265         raise NotImplementedError("This method must be implemented by sublclasses")
 266
 267     @property
 268     def SEARCH_KEY(self):
 269         return self._SEARCH_KEY