X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=youtube_dl%2Fextractor%2Fcommon.py;h=39cef9c5b99d1c47545455970344bc836c77494e;hb=55801fc76e2813de9a84eaa830d70ed73cb44463;hp=48f58aae384c7330648cca771062742fe4337718;hpb=cf0649f8b76879f9d32ceab91e87d659ea8ec398;p=youtube-dl
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 48f58aae3..39cef9c5b 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -14,26 +14,35 @@ import xml.etree.ElementTree
from ..compat import (
compat_cookiejar,
+ compat_cookies,
+ compat_getpass,
compat_HTTPError,
compat_http_client,
compat_urllib_error,
+ compat_urllib_parse,
compat_urllib_parse_urlparse,
+ compat_urllib_request,
compat_urlparse,
compat_str,
)
from ..utils import (
+ NO_DEFAULT,
age_restricted,
bug_reports_message,
clean_html,
compiled_regex_type,
+ determine_ext,
ExtractorError,
+ fix_xml_ampersands,
float_or_none,
int_or_none,
RegexNotFoundError,
sanitize_filename,
unescapeHTML,
+ url_basename,
+ xpath_text,
+ xpath_with_ns,
)
-_NO_DEFAULT = object()
class InfoExtractor(object):
@@ -63,7 +72,7 @@ class InfoExtractor(object):
Potential fields:
* url Mandatory. The URL of the video file
- * ext Will be calculated from url if missing
+ * ext Will be calculated from URL if missing
* format A human-readable description of the format
("mp4 container with h264/opus").
Calculated from the format_id, width, height.
@@ -111,11 +120,8 @@ class InfoExtractor(object):
(quality takes higher priority)
-1 for default (order by other properties),
-2 or smaller for less than default.
- * http_method HTTP method to use for the download.
* http_headers A dictionary of additional HTTP headers
to add to the request.
- * http_post_data Additional data to send with a POST
- request.
* stretched_ratio If given and not 1, indicates that the
video's pixels are not square.
width : height ratio as float.
@@ -156,7 +162,7 @@ class InfoExtractor(object):
lower to higher preference, each element is a dictionary
with the "ext" entry and one of:
* "data": The subtitles file contents
- * "url": A url pointing to the subtitles file
+ * "url": A URL pointing to the subtitles file
automatic_captions: Like 'subtitles', used by the YoutubeIE for
automatically generated captions
duration: Length of the video in seconds, as an integer.
@@ -177,13 +183,18 @@ class InfoExtractor(object):
Set to "root" to indicate that this is a
comment to the original video.
age_limit: Age restriction for the video, as an integer (years)
- webpage_url: The url to the video webpage, if given to youtube-dl it
+ webpage_url: The URL to the video webpage, if given to youtube-dl it
should allow to get the same result again. (It will be set
by YoutubeDL if it's missing)
categories: A list of categories that the video falls in, for example
["Sports", "Berlin"]
+ tags: A list of tags assigned to the video, e.g. ["sweden", "pop music"]
is_live: True, False, or None (=unknown). Whether this video is a
live stream that goes on instead of a fixed-length video.
+ start_time: Time in seconds where the reproduction should start, as
+ specified in the URL.
+ end_time: Time in seconds where the reproduction should end, as
+ specified in the URL.
Unless mentioned otherwise, the fields should be Unicode strings.
@@ -194,8 +205,8 @@ class InfoExtractor(object):
There must be a key "entries", which is a list, an iterable, or a PagedList
object, each element of which is a valid dictionary by this specification.
- Additionally, playlists can have "title" and "id" attributes with the same
- semantics as videos (see above).
+ Additionally, playlists can have "title", "description" and "id" attributes
+ with the same semantics as videos (see above).
_type "multi_video" indicates that there are multiple videos that
@@ -499,10 +510,16 @@ class InfoExtractor(object):
"""Report attempt to log in."""
self.to_screen('Logging in')
+ @staticmethod
+ def raise_login_required(msg='This video is only available for registered users'):
+ raise ExtractorError(
+ '%s. Use --username and --password or --netrc to provide account credentials.' % msg,
+ expected=True)
+
# Methods for following #608
@staticmethod
def url_result(url, ie=None, video_id=None, video_title=None):
- """Returns a url that points to a page that should be processed"""
+ """Returns a URL that points to a page that should be processed"""
# TODO: ie should be the class used for getting the info
video_info = {'_type': 'url',
'url': url,
@@ -526,7 +543,7 @@ class InfoExtractor(object):
video_info['description'] = playlist_description
return video_info
- def _search_regex(self, pattern, string, name, default=_NO_DEFAULT, fatal=True, flags=0, group=None):
+ def _search_regex(self, pattern, string, name, default=NO_DEFAULT, fatal=True, flags=0, group=None):
"""
Perform a regex search on the given string, using a single or a list of
patterns returning the first matching group.
@@ -552,7 +569,7 @@ class InfoExtractor(object):
return next(g for g in mobj.groups() if g is not None)
else:
return mobj.group(group)
- elif default is not _NO_DEFAULT:
+ elif default is not NO_DEFAULT:
return default
elif fatal:
raise RegexNotFoundError('Unable to extract %s' % _name)
@@ -560,7 +577,7 @@ class InfoExtractor(object):
self._downloader.report_warning('unable to extract %s' % _name + bug_reports_message())
return None
- def _html_search_regex(self, pattern, string, name, default=_NO_DEFAULT, fatal=True, flags=0, group=None):
+ def _html_search_regex(self, pattern, string, name, default=NO_DEFAULT, fatal=True, flags=0, group=None):
"""
Like _search_regex, but strips HTML tags and unescapes entities.
"""
@@ -600,7 +617,7 @@ class InfoExtractor(object):
return (username, password)
- def _get_tfa_info(self):
+ def _get_tfa_info(self, note='two-factor verification code'):
"""
Get the two-factor authentication info
TODO - asking the user will be required for sms/phone verify
@@ -614,7 +631,7 @@ class InfoExtractor(object):
if downloader_params.get('twofactor', None) is not None:
return downloader_params['twofactor']
- return None
+ return compat_getpass('Type %s and press [Return]: ' % note)
# Helper functions for extracting OpenGraph info
@staticmethod
@@ -627,6 +644,12 @@ class InfoExtractor(object):
template % (content_re, property_re),
]
+ @staticmethod
+ def _meta_regex(prop):
+ return r'''(?isx)]+(?:itemprop|name|property|id|http-equiv)=(["\']?)%s\1)
+ [^>]+?content=(["\'])(?P.*?)\2''' % re.escape(prop)
+
def _og_search_property(self, prop, html, name=None, **kargs):
if name is None:
name = 'OpenGraph %s' % prop
@@ -636,7 +659,7 @@ class InfoExtractor(object):
return unescapeHTML(escaped)
def _og_search_thumbnail(self, html, **kargs):
- return self._og_search_property('image', html, 'thumbnail url', fatal=False, **kargs)
+ return self._og_search_property('image', html, 'thumbnail URL', fatal=False, **kargs)
def _og_search_description(self, html, **kargs):
return self._og_search_property('description', html, fatal=False, **kargs)
@@ -657,9 +680,7 @@ class InfoExtractor(object):
if display_name is None:
display_name = name
return self._html_search_regex(
- r'''(?isx)]+(?:itemprop|name|property)=(["\']?)%s\1)
- [^>]+?content=(["\'])(?P.*?)\2''' % re.escape(name),
+ self._meta_regex(name),
html, display_name, fatal=fatal, group='content', **kwargs)
def _dc_search_uploader(self, html):
@@ -708,6 +729,27 @@ class InfoExtractor(object):
return self._html_search_meta('twitter:player', html,
'twitter card player')
+ @staticmethod
+ def _hidden_inputs(html):
+ hidden_inputs = {}
+ for input in re.findall(r']+)>', html):
+ if not re.search(r'type=(["\'])hidden\1', input):
+ continue
+ name = re.search(r'name=(["\'])(?P.+?)\1', input)
+ if not name:
+ continue
+ value = re.search(r'value=(["\'])(?P.*?)\1', input)
+ if not value:
+ continue
+ hidden_inputs[name.group('value')] = value.group('value')
+ return hidden_inputs
+
+ def _form_hidden_inputs(self, form_id, html):
+ form = self._search_regex(
+ r'(?s)]+?id=(["\'])%s\1[^>]*>(?P' % form_id,
+ html, '%s form' % form_id, group='form')
+ return self._hidden_inputs(form)
+
def _sort_formats(self, formats, field_preference=None):
if not formats:
raise ExtractorError('No video formats found')
@@ -767,7 +809,7 @@ class InfoExtractor(object):
f.get('fps') if f.get('fps') is not None else -1,
f.get('filesize_approx') if f.get('filesize_approx') is not None else -1,
f.get('source_preference') if f.get('source_preference') is not None else -1,
- f.get('format_id'),
+ f.get('format_id') if f.get('format_id') is not None else '',
)
formats.sort(key=_formats_key)
@@ -789,8 +831,8 @@ class InfoExtractor(object):
return True
except ExtractorError as e:
if isinstance(e.cause, compat_HTTPError):
- self.report_warning(
- '%s URL is invalid, skipping' % item, video_id)
+ self.to_screen(
+ '%s: %s URL is invalid, skipping' % (video_id, item))
return False
raise
@@ -818,10 +860,14 @@ class InfoExtractor(object):
self.to_screen(msg)
time.sleep(timeout)
- def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None):
+ def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None,
+ transform_source=lambda s: fix_xml_ampersands(s).strip()):
manifest = self._download_xml(
manifest_url, video_id, 'Downloading f4m manifest',
- 'Unable to download f4m manifest')
+ 'Unable to download f4m manifest',
+ # Some manifests may be malformed, e.g. prosiebensat1 generated manifests
+ # (see https://github.com/rg3/youtube-dl/issues/6215#issuecomment-121704244)
+ transform_source=transform_source)
formats = []
manifest_version = '1.0'
@@ -831,8 +877,19 @@ class InfoExtractor(object):
media_nodes = manifest.findall('{http://ns.adobe.com/f4m/2.0}media')
for i, media_el in enumerate(media_nodes):
if manifest_version == '2.0':
- manifest_url = ('/'.join(manifest_url.split('/')[:-1]) + '/' +
- (media_el.attrib.get('href') or media_el.attrib.get('url')))
+ media_url = media_el.attrib.get('href') or media_el.attrib.get('url')
+ if not media_url:
+ continue
+ manifest_url = (
+ media_url if media_url.startswith('http://') or media_url.startswith('https://')
+ else ('/'.join(manifest_url.split('/')[:-1]) + '/' + media_url))
+ # If media_url is itself a f4m manifest do the recursive extraction
+ # since bitrates in parent manifest (this one) and media_url manifest
+ # may differ leading to inability to resolve the format by requested
+ # bitrate in f4m downloader
+ if determine_ext(manifest_url) == 'f4m':
+ formats.extend(self._extract_f4m_formats(manifest_url, video_id, preference, f4m_id))
+ continue
tbr = int_or_none(media_el.attrib.get('bitrate'))
formats.append({
'format_id': '-'.join(filter(None, [f4m_id, compat_str(i if tbr is None else tbr)])),
@@ -849,7 +906,8 @@ class InfoExtractor(object):
def _extract_m3u8_formats(self, m3u8_url, video_id, ext=None,
entry_protocol='m3u8', preference=None,
- m3u8_id=None):
+ m3u8_id=None, note=None, errnote=None,
+ fatal=True):
formats = [{
'format_id': '-'.join(filter(None, [m3u8_id, 'meta'])),
@@ -868,8 +926,11 @@ class InfoExtractor(object):
m3u8_doc = self._download_webpage(
m3u8_url, video_id,
- note='Downloading m3u8 information',
- errnote='Failed to download m3u8 information')
+ note=note or 'Downloading m3u8 information',
+ errnote=errnote or 'Failed to download m3u8 information',
+ fatal=fatal)
+ if m3u8_doc is False:
+ return m3u8_doc
last_info = None
last_media = None
kv_rex = re.compile(
@@ -899,7 +960,7 @@ class InfoExtractor(object):
format_id = []
if m3u8_id:
format_id.append(m3u8_id)
- last_media_name = last_media.get('NAME') if last_media else None
+ last_media_name = last_media.get('NAME') if last_media and last_media.get('TYPE') != 'SUBTITLES' else None
format_id.append(last_media_name if last_media_name else '%d' % (tbr if tbr else len(formats)))
f = {
'format_id': '-'.join(format_id),
@@ -930,69 +991,221 @@ class InfoExtractor(object):
self._sort_formats(formats)
return formats
- # TODO: improve extraction
- def _extract_smil_formats(self, smil_url, video_id, fatal=True):
- smil = self._download_xml(
- smil_url, video_id, 'Downloading SMIL file',
- 'Unable to download SMIL file', fatal=fatal)
+ @staticmethod
+ def _xpath_ns(path, namespace=None):
+ if not namespace:
+ return path
+ out = []
+ for c in path.split('/'):
+ if not c or c == '.':
+ out.append(c)
+ else:
+ out.append('{%s}%s' % (namespace, c))
+ return '/'.join(out)
+
+ def _extract_smil_formats(self, smil_url, video_id, fatal=True, f4m_params=None):
+ smil = self._download_smil(smil_url, video_id, fatal=fatal)
+
if smil is False:
assert not fatal
return []
- base = smil.find('./head/meta').get('base')
+ namespace = self._parse_smil_namespace(smil)
+
+ return self._parse_smil_formats(
+ smil, smil_url, video_id, namespace=namespace, f4m_params=f4m_params)
+
+ def _extract_smil_info(self, smil_url, video_id, fatal=True, f4m_params=None):
+ smil = self._download_smil(smil_url, video_id, fatal=fatal)
+ if smil is False:
+ return {}
+ return self._parse_smil(smil, smil_url, video_id, f4m_params=f4m_params)
+
+ def _download_smil(self, smil_url, video_id, fatal=True):
+ return self._download_xml(
+ smil_url, video_id, 'Downloading SMIL file',
+ 'Unable to download SMIL file', fatal=fatal)
+
+ def _parse_smil(self, smil, smil_url, video_id, f4m_params=None):
+ namespace = self._parse_smil_namespace(smil)
+
+ formats = self._parse_smil_formats(
+ smil, smil_url, video_id, namespace=namespace, f4m_params=f4m_params)
+ subtitles = self._parse_smil_subtitles(smil, namespace=namespace)
+
+ video_id = os.path.splitext(url_basename(smil_url))[0]
+ title = None
+ description = None
+ for meta in smil.findall(self._xpath_ns('./head/meta', namespace)):
+ name = meta.attrib.get('name')
+ content = meta.attrib.get('content')
+ if not name or not content:
+ continue
+ if not title and name == 'title':
+ title = content
+ elif not description and name in ('description', 'abstract'):
+ description = content
+
+ return {
+ 'id': video_id,
+ 'title': title or video_id,
+ 'description': description,
+ 'formats': formats,
+ 'subtitles': subtitles,
+ }
+
+ def _parse_smil_namespace(self, smil):
+ return self._search_regex(
+ r'(?i)^{([^}]+)?}smil$', smil.tag, 'namespace', default=None)
+
+ def _parse_smil_formats(self, smil, smil_url, video_id, namespace=None, f4m_params=None, transform_rtmp_url=None):
+ base = smil_url
+ for meta in smil.findall(self._xpath_ns('./head/meta', namespace)):
+ b = meta.get('base') or meta.get('httpBase')
+ if b:
+ base = b
+ break
formats = []
rtmp_count = 0
- if smil.findall('./body/seq/video'):
- video = smil.findall('./body/seq/video')[0]
- fmts, rtmp_count = self._parse_smil_video(video, video_id, base, rtmp_count)
- formats.extend(fmts)
- else:
- for video in smil.findall('./body/switch/video'):
- fmts, rtmp_count = self._parse_smil_video(video, video_id, base, rtmp_count)
- formats.extend(fmts)
+ http_count = 0
+
+ videos = smil.findall(self._xpath_ns('.//video', namespace))
+ for video in videos:
+ src = video.get('src')
+ if not src:
+ continue
+
+ bitrate = int_or_none(video.get('system-bitrate') or video.get('systemBitrate'), 1000)
+ filesize = int_or_none(video.get('size') or video.get('fileSize'))
+ width = int_or_none(video.get('width'))
+ height = int_or_none(video.get('height'))
+ proto = video.get('proto')
+ ext = video.get('ext')
+ src_ext = determine_ext(src)
+ streamer = video.get('streamer') or base
+
+ if proto == 'rtmp' or streamer.startswith('rtmp'):
+ rtmp_count += 1
+ formats.append({
+ 'url': streamer,
+ 'play_path': src,
+ 'ext': 'flv',
+ 'format_id': 'rtmp-%d' % (rtmp_count if bitrate is None else bitrate),
+ 'tbr': bitrate,
+ 'filesize': filesize,
+ 'width': width,
+ 'height': height,
+ })
+ if transform_rtmp_url:
+ streamer, src = transform_rtmp_url(streamer, src)
+ formats[-1].update({
+ 'url': streamer,
+ 'play_path': src,
+ })
+ continue
+
+ src_url = src if src.startswith('http') else compat_urlparse.urljoin(base, src)
+
+ if proto == 'm3u8' or src_ext == 'm3u8':
+ formats.extend(self._extract_m3u8_formats(
+ src_url, video_id, ext or 'mp4', m3u8_id='hls'))
+ continue
+
+ if src_ext == 'f4m':
+ f4m_url = src_url
+ if not f4m_params:
+ f4m_params = {
+ 'hdcore': '3.2.0',
+ 'plugin': 'flowplayer-3.2.0.1',
+ }
+ f4m_url += '&' if '?' in f4m_url else '?'
+ f4m_url += compat_urllib_parse.urlencode(f4m_params)
+ formats.extend(self._extract_f4m_formats(f4m_url, video_id, f4m_id='hds'))
+ continue
+
+ if src_url.startswith('http'):
+ http_count += 1
+ formats.append({
+ 'url': src_url,
+ 'ext': ext or src_ext or 'flv',
+ 'format_id': 'http-%d' % (bitrate or http_count),
+ 'tbr': bitrate,
+ 'filesize': filesize,
+ 'width': width,
+ 'height': height,
+ })
+ continue
self._sort_formats(formats)
return formats
- def _parse_smil_video(self, video, video_id, base, rtmp_count):
- src = video.get('src')
- if not src:
- return ([], rtmp_count)
- bitrate = int_or_none(video.get('system-bitrate') or video.get('systemBitrate'), 1000)
- width = int_or_none(video.get('width'))
- height = int_or_none(video.get('height'))
- proto = video.get('proto')
- if not proto:
- if base:
- if base.startswith('rtmp'):
- proto = 'rtmp'
- elif base.startswith('http'):
- proto = 'http'
- ext = video.get('ext')
- if proto == 'm3u8':
- return (self._extract_m3u8_formats(src, video_id, ext), rtmp_count)
- elif proto == 'rtmp':
- rtmp_count += 1
- streamer = video.get('streamer') or base
- return ([{
- 'url': streamer,
- 'play_path': src,
- 'ext': 'flv',
- 'format_id': 'rtmp-%d' % (rtmp_count if bitrate is None else bitrate),
- 'tbr': bitrate,
- 'width': width,
- 'height': height,
- }], rtmp_count)
- elif proto.startswith('http'):
- return ([{
- 'url': base + src,
- 'ext': ext or 'flv',
- 'tbr': bitrate,
- 'width': width,
- 'height': height,
- }], rtmp_count)
+ def _parse_smil_subtitles(self, smil, namespace=None, subtitles_lang='en'):
+ subtitles = {}
+ for num, textstream in enumerate(smil.findall(self._xpath_ns('.//textstream', namespace))):
+ src = textstream.get('src')
+ if not src:
+ continue
+ ext = textstream.get('ext') or determine_ext(src)
+ if not ext:
+ type_ = textstream.get('type')
+ SUBTITLES_TYPES = {
+ 'text/vtt': 'vtt',
+ 'text/srt': 'srt',
+ 'application/smptett+xml': 'tt',
+ }
+ if type_ in SUBTITLES_TYPES:
+ ext = SUBTITLES_TYPES[type_]
+ lang = textstream.get('systemLanguage') or textstream.get('systemLanguageName') or textstream.get('lang') or subtitles_lang
+ subtitles.setdefault(lang, []).append({
+ 'url': src,
+ 'ext': ext,
+ })
+ return subtitles
+
+ def _extract_xspf_playlist(self, playlist_url, playlist_id, fatal=True):
+ xspf = self._download_xml(
+ playlist_url, playlist_id, 'Downloading xpsf playlist',
+ 'Unable to download xspf manifest', fatal=fatal)
+ if xspf is False:
+ return []
+ return self._parse_xspf(xspf, playlist_id)
+
+ def _parse_xspf(self, playlist, playlist_id):
+ NS_MAP = {
+ 'xspf': 'http://xspf.org/ns/0/',
+ 's1': 'http://static.streamone.nl/player/ns/0',
+ }
+
+ entries = []
+ for track in playlist.findall(xpath_with_ns('./xspf:trackList/xspf:track', NS_MAP)):
+ title = xpath_text(
+ track, xpath_with_ns('./xspf:title', NS_MAP), 'title', default=playlist_id)
+ description = xpath_text(
+ track, xpath_with_ns('./xspf:annotation', NS_MAP), 'description')
+ thumbnail = xpath_text(
+ track, xpath_with_ns('./xspf:image', NS_MAP), 'thumbnail')
+ duration = float_or_none(
+ xpath_text(track, xpath_with_ns('./xspf:duration', NS_MAP), 'duration'), 1000)
+
+ formats = [{
+ 'url': location.text,
+ 'format_id': location.get(xpath_with_ns('s1:label', NS_MAP)),
+ 'width': int_or_none(location.get(xpath_with_ns('s1:width', NS_MAP))),
+ 'height': int_or_none(location.get(xpath_with_ns('s1:height', NS_MAP))),
+ } for location in track.findall(xpath_with_ns('./xspf:location', NS_MAP))]
+ self._sort_formats(formats)
+
+ entries.append({
+ 'id': playlist_id,
+ 'title': title,
+ 'description': description,
+ 'thumbnail': thumbnail,
+ 'duration': duration,
+ 'formats': formats,
+ })
+ return entries
def _live_title(self, name):
""" Generate the title for a live video """
@@ -1028,6 +1241,12 @@ class InfoExtractor(object):
None, '/', True, False, expire_time, '', None, None, None)
self._downloader.cookiejar.set_cookie(cookie)
+ def _get_cookies(self, url):
+ """ Return a compat_cookies.SimpleCookie with the cookies for the url """
+ req = compat_urllib_request.Request(url)
+ self._downloader.cookiejar.add_cookie_header(req)
+ return compat_cookies.SimpleCookie(req.get_header('Cookie'))
+
def get_testcases(self, include_onlymatching=False):
t = getattr(self, '_TEST', None)
if t:
@@ -1066,6 +1285,23 @@ class InfoExtractor(object):
def _get_subtitles(self, *args, **kwargs):
raise NotImplementedError("This method must be implemented by subclasses")
+ @staticmethod
+ def _merge_subtitle_items(subtitle_list1, subtitle_list2):
+ """ Merge subtitle items for one language. Items with duplicated URLs
+ will be dropped. """
+ list1_urls = set([item['url'] for item in subtitle_list1])
+ ret = list(subtitle_list1)
+ ret.extend([item for item in subtitle_list2 if item['url'] not in list1_urls])
+ return ret
+
+ @classmethod
+ def _merge_subtitles(cls, subtitle_dict1, subtitle_dict2):
+ """ Merge two subtitle dictionaries, language by language. """
+ ret = dict(subtitle_dict1)
+ for lang in subtitle_dict2:
+ ret[lang] = cls._merge_subtitle_items(subtitle_dict1.get(lang, []), subtitle_dict2[lang])
+ return ret
+
def extract_automatic_captions(self, *args, **kwargs):
if (self._downloader.params.get('writeautomaticsub', False) or
self._downloader.params.get('listsubtitles')):
@@ -1075,14 +1311,11 @@ class InfoExtractor(object):
def _get_automatic_captions(self, *args, **kwargs):
raise NotImplementedError("This method must be implemented by subclasses")
- def _subtitles_timecode(self, seconds):
- return '%02d:%02d:%02d.%03d' % (seconds / 3600, (seconds % 3600) / 60, seconds % 60, (seconds % 1) * 1000)
-
class SearchInfoExtractor(InfoExtractor):
"""
Base class for paged search queries extractors.
- They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query}
+ They accept URLs in the format _SEARCH_KEY(|all|[0-9]):{query}
Instances should define _SEARCH_KEY and _MAX_RESULTS.
"""