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d6983cb4 PH |
1 | import base64 |
2 | import os | |
3 | import re | |
4 | import socket | |
5 | import sys | |
fc79158d | 6 | import netrc |
d6983cb4 PH |
7 | |
8 | from ..utils import ( | |
9 | compat_http_client, | |
10 | compat_urllib_error, | |
11 | compat_urllib_request, | |
12 | compat_str, | |
13 | ||
14 | clean_html, | |
15 | compiled_regex_type, | |
16 | ExtractorError, | |
f38de77f | 17 | unescapeHTML, |
d6983cb4 PH |
18 | ) |
19 | ||
20 | class InfoExtractor(object): | |
21 | """Information Extractor class. | |
22 | ||
23 | Information extractors are the classes that, given a URL, extract | |
24 | information about the video (or videos) the URL refers to. This | |
25 | information includes the real video URL, the video title, author and | |
26 | others. The information is stored in a dictionary which is then | |
27 | passed to the FileDownloader. The FileDownloader processes this | |
28 | information possibly downloading the video to the file system, among | |
29 | other possible outcomes. | |
30 | ||
31 | The dictionaries must include the following fields: | |
32 | ||
33 | id: Video identifier. | |
34 | url: Final video URL. | |
35 | title: Video title, unescaped. | |
36 | ext: Video filename extension. | |
37 | ||
38 | The following fields are optional: | |
39 | ||
40 | format: The video format, defaults to ext (used for --get-format) | |
73e79f2a PH |
41 | thumbnails: A list of dictionaries (with the entries "resolution" and |
42 | "url") for the varying thumbnails | |
d6983cb4 PH |
43 | thumbnail: Full URL to a video thumbnail image. |
44 | description: One-line video description. | |
45 | uploader: Full name of the video uploader. | |
46 | upload_date: Video upload date (YYYYMMDD). | |
47 | uploader_id: Nickname or id of the video uploader. | |
48 | location: Physical location of the video. | |
49 | player_url: SWF Player URL (used for rtmpdump). | |
50 | subtitles: The subtitle file contents. | |
f3d29461 | 51 | view_count: How many users have watched the video on the platform. |
d6983cb4 PH |
52 | urlhandle: [internal] The urlHandle to be used to download the file, |
53 | like returned by urllib.request.urlopen | |
54 | ||
55 | The fields should all be Unicode strings. | |
56 | ||
57 | Subclasses of this one should re-define the _real_initialize() and | |
58 | _real_extract() methods and define a _VALID_URL regexp. | |
59 | Probably, they should also be added to the list of extractors. | |
60 | ||
61 | _real_extract() must return a *list* of information dictionaries as | |
62 | described above. | |
63 | ||
64 | Finally, the _WORKING attribute should be set to False for broken IEs | |
65 | in order to warn the users and skip the tests. | |
66 | """ | |
67 | ||
68 | _ready = False | |
69 | _downloader = None | |
70 | _WORKING = True | |
71 | ||
72 | def __init__(self, downloader=None): | |
73 | """Constructor. Receives an optional downloader.""" | |
74 | self._ready = False | |
75 | self.set_downloader(downloader) | |
76 | ||
77 | @classmethod | |
78 | def suitable(cls, url): | |
79 | """Receives a URL and returns True if suitable for this IE.""" | |
80 | return re.match(cls._VALID_URL, url) is not None | |
81 | ||
82 | @classmethod | |
83 | def working(cls): | |
84 | """Getter method for _WORKING.""" | |
85 | return cls._WORKING | |
86 | ||
87 | def initialize(self): | |
88 | """Initializes an instance (authentication, etc).""" | |
89 | if not self._ready: | |
90 | self._real_initialize() | |
91 | self._ready = True | |
92 | ||
93 | def extract(self, url): | |
94 | """Extracts URL information and returns it in list of dicts.""" | |
95 | self.initialize() | |
96 | return self._real_extract(url) | |
97 | ||
98 | def set_downloader(self, downloader): | |
99 | """Sets the downloader for this IE.""" | |
100 | self._downloader = downloader | |
101 | ||
102 | def _real_initialize(self): | |
103 | """Real initialization process. Redefine in subclasses.""" | |
104 | pass | |
105 | ||
106 | def _real_extract(self, url): | |
107 | """Real extraction process. Redefine in subclasses.""" | |
108 | pass | |
109 | ||
110 | @property | |
111 | def IE_NAME(self): | |
112 | return type(self).__name__[:-2] | |
113 | ||
114 | def _request_webpage(self, url_or_request, video_id, note=None, errnote=None): | |
115 | """ Returns the response handle """ | |
116 | if note is None: | |
117 | self.report_download_webpage(video_id) | |
118 | elif note is not False: | |
119 | self.to_screen(u'%s: %s' % (video_id, note)) | |
120 | try: | |
121 | return compat_urllib_request.urlopen(url_or_request) | |
122 | except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err: | |
123 | if errnote is None: | |
124 | errnote = u'Unable to download webpage' | |
125 | raise ExtractorError(u'%s: %s' % (errnote, compat_str(err)), sys.exc_info()[2]) | |
126 | ||
127 | def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None): | |
128 | """ Returns a tuple (page content as string, URL handle) """ | |
b9d3e163 PH |
129 | |
130 | # Strip hashes from the URL (#1038) | |
131 | if isinstance(url_or_request, (compat_str, str)): | |
132 | url_or_request = url_or_request.partition('#')[0] | |
133 | ||
d6983cb4 PH |
134 | urlh = self._request_webpage(url_or_request, video_id, note, errnote) |
135 | content_type = urlh.headers.get('Content-Type', '') | |
136 | m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type) | |
137 | if m: | |
138 | encoding = m.group(1) | |
139 | else: | |
140 | encoding = 'utf-8' | |
141 | webpage_bytes = urlh.read() | |
142 | if self._downloader.params.get('dump_intermediate_pages', False): | |
143 | try: | |
144 | url = url_or_request.get_full_url() | |
145 | except AttributeError: | |
146 | url = url_or_request | |
147 | self.to_screen(u'Dumping request to ' + url) | |
148 | dump = base64.b64encode(webpage_bytes).decode('ascii') | |
149 | self._downloader.to_screen(dump) | |
150 | content = webpage_bytes.decode(encoding, 'replace') | |
151 | return (content, urlh) | |
152 | ||
153 | def _download_webpage(self, url_or_request, video_id, note=None, errnote=None): | |
154 | """ Returns the data of the page as a string """ | |
155 | return self._download_webpage_handle(url_or_request, video_id, note, errnote)[0] | |
156 | ||
157 | def to_screen(self, msg): | |
158 | """Print msg to screen, prefixing it with '[ie_name]'""" | |
159 | self._downloader.to_screen(u'[%s] %s' % (self.IE_NAME, msg)) | |
160 | ||
161 | def report_extraction(self, id_or_name): | |
162 | """Report information extraction.""" | |
163 | self.to_screen(u'%s: Extracting information' % id_or_name) | |
164 | ||
165 | def report_download_webpage(self, video_id): | |
166 | """Report webpage download.""" | |
167 | self.to_screen(u'%s: Downloading webpage' % video_id) | |
168 | ||
169 | def report_age_confirmation(self): | |
170 | """Report attempt to confirm age.""" | |
171 | self.to_screen(u'Confirming age') | |
172 | ||
fc79158d JMF |
173 | def report_login(self): |
174 | """Report attempt to log in.""" | |
175 | self.to_screen(u'Logging in') | |
176 | ||
d6983cb4 | 177 | #Methods for following #608 |
d6983cb4 PH |
178 | def url_result(self, url, ie=None): |
179 | """Returns a url that points to a page that should be processed""" | |
180 | #TODO: ie should be the class used for getting the info | |
181 | video_info = {'_type': 'url', | |
182 | 'url': url, | |
183 | 'ie_key': ie} | |
184 | return video_info | |
185 | def playlist_result(self, entries, playlist_id=None, playlist_title=None): | |
186 | """Returns a playlist""" | |
187 | video_info = {'_type': 'playlist', | |
188 | 'entries': entries} | |
189 | if playlist_id: | |
190 | video_info['id'] = playlist_id | |
191 | if playlist_title: | |
192 | video_info['title'] = playlist_title | |
193 | return video_info | |
194 | ||
195 | def _search_regex(self, pattern, string, name, default=None, fatal=True, flags=0): | |
196 | """ | |
197 | Perform a regex search on the given string, using a single or a list of | |
198 | patterns returning the first matching group. | |
199 | In case of failure return a default value or raise a WARNING or a | |
200 | ExtractorError, depending on fatal, specifying the field name. | |
201 | """ | |
202 | if isinstance(pattern, (str, compat_str, compiled_regex_type)): | |
203 | mobj = re.search(pattern, string, flags) | |
204 | else: | |
205 | for p in pattern: | |
206 | mobj = re.search(p, string, flags) | |
207 | if mobj: break | |
208 | ||
209 | if sys.stderr.isatty() and os.name != 'nt': | |
210 | _name = u'\033[0;34m%s\033[0m' % name | |
211 | else: | |
212 | _name = name | |
213 | ||
214 | if mobj: | |
215 | # return the first matching group | |
216 | return next(g for g in mobj.groups() if g is not None) | |
217 | elif default is not None: | |
218 | return default | |
219 | elif fatal: | |
220 | raise ExtractorError(u'Unable to extract %s' % _name) | |
221 | else: | |
222 | self._downloader.report_warning(u'unable to extract %s; ' | |
98bcd283 | 223 | u'please report this issue on http://yt-dl.org/bug' % _name) |
d6983cb4 PH |
224 | return None |
225 | ||
226 | def _html_search_regex(self, pattern, string, name, default=None, fatal=True, flags=0): | |
227 | """ | |
228 | Like _search_regex, but strips HTML tags and unescapes entities. | |
229 | """ | |
230 | res = self._search_regex(pattern, string, name, default, fatal, flags) | |
231 | if res: | |
232 | return clean_html(res).strip() | |
233 | else: | |
234 | return res | |
235 | ||
fc79158d JMF |
236 | def _get_login_info(self): |
237 | """ | |
238 | Get the the login info as (username, password) | |
239 | It will look in the netrc file using the _NETRC_MACHINE value | |
240 | If there's no info available, return (None, None) | |
241 | """ | |
242 | if self._downloader is None: | |
243 | return (None, None) | |
244 | ||
245 | username = None | |
246 | password = None | |
247 | downloader_params = self._downloader.params | |
248 | ||
249 | # Attempt to use provided username and password or .netrc data | |
250 | if downloader_params.get('username', None) is not None: | |
251 | username = downloader_params['username'] | |
252 | password = downloader_params['password'] | |
253 | elif downloader_params.get('usenetrc', False): | |
254 | try: | |
255 | info = netrc.netrc().authenticators(self._NETRC_MACHINE) | |
256 | if info is not None: | |
257 | username = info[0] | |
258 | password = info[2] | |
259 | else: | |
260 | raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE) | |
261 | except (IOError, netrc.NetrcParseError) as err: | |
262 | self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err)) | |
263 | ||
264 | return (username, password) | |
265 | ||
46720279 JMF |
266 | # Helper functions for extracting OpenGraph info |
267 | @staticmethod | |
3c4e6d83 PH |
268 | def _og_regex(prop): |
269 | return r'<meta.+?property=[\'"]og:%s[\'"].+?content=(?:"(.+?)"|\'(.+?)\')' % re.escape(prop) | |
46720279 | 270 | |
3c4e6d83 | 271 | def _og_search_property(self, prop, html, name=None, **kargs): |
46720279 | 272 | if name is None: |
3c4e6d83 | 273 | name = 'OpenGraph %s' % prop |
f38de77f PH |
274 | escaped = self._search_regex(self._og_regex(prop), html, name, flags=re.DOTALL, **kargs) |
275 | return unescapeHTML(escaped) | |
46720279 JMF |
276 | |
277 | def _og_search_thumbnail(self, html, **kargs): | |
3c4e6d83 | 278 | return self._og_search_property('image', html, u'thumbnail url', fatal=False, **kargs) |
46720279 JMF |
279 | |
280 | def _og_search_description(self, html, **kargs): | |
281 | return self._og_search_property('description', html, fatal=False, **kargs) | |
282 | ||
283 | def _og_search_title(self, html, **kargs): | |
284 | return self._og_search_property('title', html, **kargs) | |
285 | ||
286 | def _og_search_video_url(self, html, name='video url', **kargs): | |
287 | return self._html_search_regex([self._og_regex('video:secure_url'), | |
288 | self._og_regex('video')], | |
289 | html, name, **kargs) | |
290 | ||
d6983cb4 PH |
291 | class SearchInfoExtractor(InfoExtractor): |
292 | """ | |
293 | Base class for paged search queries extractors. | |
294 | They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query} | |
295 | Instances should define _SEARCH_KEY and _MAX_RESULTS. | |
296 | """ | |
297 | ||
298 | @classmethod | |
299 | def _make_valid_url(cls): | |
300 | return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY | |
301 | ||
302 | @classmethod | |
303 | def suitable(cls, url): | |
304 | return re.match(cls._make_valid_url(), url) is not None | |
305 | ||
306 | def _real_extract(self, query): | |
307 | mobj = re.match(self._make_valid_url(), query) | |
308 | if mobj is None: | |
309 | raise ExtractorError(u'Invalid search query "%s"' % query) | |
310 | ||
311 | prefix = mobj.group('prefix') | |
312 | query = mobj.group('query') | |
313 | if prefix == '': | |
314 | return self._get_n_results(query, 1) | |
315 | elif prefix == 'all': | |
316 | return self._get_n_results(query, self._MAX_RESULTS) | |
317 | else: | |
318 | n = int(prefix) | |
319 | if n <= 0: | |
320 | raise ExtractorError(u'invalid download number %s for query "%s"' % (n, query)) | |
321 | elif n > self._MAX_RESULTS: | |
322 | self._downloader.report_warning(u'%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n)) | |
323 | n = self._MAX_RESULTS | |
324 | return self._get_n_results(query, n) | |
325 | ||
326 | def _get_n_results(self, query, n): | |
327 | """Get a specified number of results for a query""" | |
328 | raise NotImplementedError("This method must be implemented by sublclasses") | |
0f818663 PH |
329 | |
330 | @property | |
331 | def SEARCH_KEY(self): | |
332 | return self._SEARCH_KEY |