mirror of
https://github.com/ytdl-org/youtube-dl.git
synced 2024-11-15 22:05:39 +00:00
738 lines
30 KiB
Python
738 lines
30 KiB
Python
from __future__ import unicode_literals
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import base64
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import hashlib
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import json
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import netrc
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import os
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import re
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import socket
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import sys
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import time
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import xml.etree.ElementTree
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from ..utils import (
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compat_http_client,
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compat_urllib_error,
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compat_urllib_parse_urlparse,
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compat_str,
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clean_html,
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compiled_regex_type,
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ExtractorError,
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int_or_none,
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RegexNotFoundError,
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sanitize_filename,
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unescapeHTML,
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)
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_NO_DEFAULT = object()
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class InfoExtractor(object):
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"""Information Extractor class.
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Information extractors are the classes that, given a URL, extract
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information about the video (or videos) the URL refers to. This
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information includes the real video URL, the video title, author and
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others. The information is stored in a dictionary which is then
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passed to the FileDownloader. The FileDownloader processes this
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information possibly downloading the video to the file system, among
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other possible outcomes.
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The dictionaries must include the following fields:
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id: Video identifier.
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title: Video title, unescaped.
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Additionally, it must contain either a formats entry or a url one:
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formats: A list of dictionaries for each format available, ordered
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from worst to best quality.
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Potential fields:
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* url Mandatory. The URL of the video file
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* ext Will be calculated from url if missing
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* format A human-readable description of the format
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("mp4 container with h264/opus").
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Calculated from the format_id, width, height.
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and format_note fields if missing.
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* format_id A short description of the format
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("mp4_h264_opus" or "19").
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Technically optional, but strongly recommended.
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* format_note Additional info about the format
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("3D" or "DASH video")
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* width Width of the video, if known
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* height Height of the video, if known
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* resolution Textual description of width and height
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* tbr Average bitrate of audio and video in KBit/s
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* abr Average audio bitrate in KBit/s
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* acodec Name of the audio codec in use
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* asr Audio sampling rate in Hertz
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* vbr Average video bitrate in KBit/s
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* vcodec Name of the video codec in use
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* container Name of the container format
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* filesize The number of bytes, if known in advance
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* filesize_approx An estimate for the number of bytes
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* player_url SWF Player URL (used for rtmpdump).
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* protocol The protocol that will be used for the actual
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download, lower-case.
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"http", "https", "rtsp", "rtmp", "m3u8" or so.
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* preference Order number of this format. If this field is
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present and not None, the formats get sorted
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by this field, regardless of all other values.
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-1 for default (order by other properties),
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-2 or smaller for less than default.
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* quality Order number of the video quality of this
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format, irrespective of the file format.
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-1 for default (order by other properties),
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-2 or smaller for less than default.
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* http_referer HTTP Referer header value to set.
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* http_method HTTP method to use for the download.
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* http_headers A dictionary of additional HTTP headers
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to add to the request.
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* http_post_data Additional data to send with a POST
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request.
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url: Final video URL.
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ext: Video filename extension.
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format: The video format, defaults to ext (used for --get-format)
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player_url: SWF Player URL (used for rtmpdump).
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The following fields are optional:
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display_id An alternative identifier for the video, not necessarily
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unique, but available before title. Typically, id is
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something like "4234987", title "Dancing naked mole rats",
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and display_id "dancing-naked-mole-rats"
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thumbnails: A list of dictionaries, with the following entries:
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* "url"
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* "width" (optional, int)
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* "height" (optional, int)
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* "resolution" (optional, string "{width}x{height"},
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deprecated)
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thumbnail: Full URL to a video thumbnail image.
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description: One-line video description.
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uploader: Full name of the video uploader.
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timestamp: UNIX timestamp of the moment the video became available.
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upload_date: Video upload date (YYYYMMDD).
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If not explicitly set, calculated from timestamp.
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uploader_id: Nickname or id of the video uploader.
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location: Physical location where the video was filmed.
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subtitles: The subtitle file contents as a dictionary in the format
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{language: subtitles}.
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duration: Length of the video in seconds, as an integer.
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view_count: How many users have watched the video on the platform.
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like_count: Number of positive ratings of the video
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dislike_count: Number of negative ratings of the video
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comment_count: Number of comments on the video
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age_limit: Age restriction for the video, as an integer (years)
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webpage_url: The url to the video webpage, if given to youtube-dl it
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should allow to get the same result again. (It will be set
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by YoutubeDL if it's missing)
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categories: A list of categories that the video falls in, for example
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["Sports", "Berlin"]
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Unless mentioned otherwise, the fields should be Unicode strings.
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Subclasses of this one should re-define the _real_initialize() and
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_real_extract() methods and define a _VALID_URL regexp.
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Probably, they should also be added to the list of extractors.
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Finally, the _WORKING attribute should be set to False for broken IEs
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in order to warn the users and skip the tests.
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"""
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_ready = False
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_downloader = None
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_WORKING = True
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def __init__(self, downloader=None):
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"""Constructor. Receives an optional downloader."""
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self._ready = False
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self.set_downloader(downloader)
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@classmethod
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def suitable(cls, url):
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"""Receives a URL and returns True if suitable for this IE."""
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# This does not use has/getattr intentionally - we want to know whether
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# we have cached the regexp for *this* class, whereas getattr would also
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# match the superclass
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if '_VALID_URL_RE' not in cls.__dict__:
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cls._VALID_URL_RE = re.compile(cls._VALID_URL)
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return cls._VALID_URL_RE.match(url) is not None
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@classmethod
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def working(cls):
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"""Getter method for _WORKING."""
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return cls._WORKING
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def initialize(self):
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"""Initializes an instance (authentication, etc)."""
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if not self._ready:
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self._real_initialize()
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self._ready = True
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def extract(self, url):
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"""Extracts URL information and returns it in list of dicts."""
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self.initialize()
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return self._real_extract(url)
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def set_downloader(self, downloader):
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"""Sets the downloader for this IE."""
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self._downloader = downloader
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def _real_initialize(self):
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"""Real initialization process. Redefine in subclasses."""
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pass
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def _real_extract(self, url):
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"""Real extraction process. Redefine in subclasses."""
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pass
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@classmethod
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def ie_key(cls):
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"""A string for getting the InfoExtractor with get_info_extractor"""
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return cls.__name__[:-2]
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@property
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def IE_NAME(self):
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return type(self).__name__[:-2]
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def _request_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True):
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""" Returns the response handle """
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if note is None:
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self.report_download_webpage(video_id)
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elif note is not False:
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if video_id is None:
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self.to_screen('%s' % (note,))
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else:
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self.to_screen('%s: %s' % (video_id, note))
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try:
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return self._downloader.urlopen(url_or_request)
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except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
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if errnote is False:
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return False
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if errnote is None:
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errnote = 'Unable to download webpage'
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errmsg = '%s: %s' % (errnote, compat_str(err))
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if fatal:
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raise ExtractorError(errmsg, sys.exc_info()[2], cause=err)
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else:
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self._downloader.report_warning(errmsg)
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return False
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def _download_webpage_handle(self, url_or_request, video_id, note=None, errnote=None, fatal=True):
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""" Returns a tuple (page content as string, URL handle) """
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# Strip hashes from the URL (#1038)
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if isinstance(url_or_request, (compat_str, str)):
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url_or_request = url_or_request.partition('#')[0]
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urlh = self._request_webpage(url_or_request, video_id, note, errnote, fatal)
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if urlh is False:
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assert not fatal
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return False
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content_type = urlh.headers.get('Content-Type', '')
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webpage_bytes = urlh.read()
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m = re.match(r'[a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+\s*;\s*charset=(.+)', content_type)
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if m:
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encoding = m.group(1)
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else:
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m = re.search(br'<meta[^>]+charset=[\'"]?([^\'")]+)[ /\'">]',
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webpage_bytes[:1024])
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if m:
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encoding = m.group(1).decode('ascii')
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elif webpage_bytes.startswith(b'\xff\xfe'):
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encoding = 'utf-16'
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else:
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encoding = 'utf-8'
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if self._downloader.params.get('dump_intermediate_pages', False):
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try:
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url = url_or_request.get_full_url()
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except AttributeError:
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url = url_or_request
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self.to_screen('Dumping request to ' + url)
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dump = base64.b64encode(webpage_bytes).decode('ascii')
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self._downloader.to_screen(dump)
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if self._downloader.params.get('write_pages', False):
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try:
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url = url_or_request.get_full_url()
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except AttributeError:
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url = url_or_request
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basen = '%s_%s' % (video_id, url)
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if len(basen) > 240:
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h = '___' + hashlib.md5(basen.encode('utf-8')).hexdigest()
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basen = basen[:240 - len(h)] + h
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raw_filename = basen + '.dump'
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filename = sanitize_filename(raw_filename, restricted=True)
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self.to_screen('Saving request to ' + filename)
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with open(filename, 'wb') as outf:
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outf.write(webpage_bytes)
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try:
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content = webpage_bytes.decode(encoding, 'replace')
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except LookupError:
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content = webpage_bytes.decode('utf-8', 'replace')
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if ('<title>Access to this site is blocked</title>' in content and
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'Websense' in content[:512]):
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msg = 'Access to this webpage has been blocked by Websense filtering software in your network.'
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blocked_iframe = self._html_search_regex(
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r'<iframe src="([^"]+)"', content,
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'Websense information URL', default=None)
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if blocked_iframe:
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msg += ' Visit %s for more details' % blocked_iframe
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raise ExtractorError(msg, expected=True)
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return (content, urlh)
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def _download_webpage(self, url_or_request, video_id, note=None, errnote=None, fatal=True):
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""" Returns the data of the page as a string """
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res = self._download_webpage_handle(url_or_request, video_id, note, errnote, fatal)
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if res is False:
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return res
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else:
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content, _ = res
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return content
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def _download_xml(self, url_or_request, video_id,
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note='Downloading XML', errnote='Unable to download XML',
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transform_source=None, fatal=True):
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"""Return the xml as an xml.etree.ElementTree.Element"""
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xml_string = self._download_webpage(
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url_or_request, video_id, note, errnote, fatal=fatal)
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if xml_string is False:
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return xml_string
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if transform_source:
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xml_string = transform_source(xml_string)
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return xml.etree.ElementTree.fromstring(xml_string.encode('utf-8'))
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def _download_json(self, url_or_request, video_id,
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note='Downloading JSON metadata',
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errnote='Unable to download JSON metadata',
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transform_source=None,
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fatal=True):
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json_string = self._download_webpage(
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url_or_request, video_id, note, errnote, fatal=fatal)
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if (not fatal) and json_string is False:
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return None
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if transform_source:
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json_string = transform_source(json_string)
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try:
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return json.loads(json_string)
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except ValueError as ve:
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raise ExtractorError('Failed to download JSON', cause=ve)
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def report_warning(self, msg, video_id=None):
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idstr = '' if video_id is None else '%s: ' % video_id
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self._downloader.report_warning(
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'[%s] %s%s' % (self.IE_NAME, idstr, msg))
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def to_screen(self, msg):
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"""Print msg to screen, prefixing it with '[ie_name]'"""
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self._downloader.to_screen('[%s] %s' % (self.IE_NAME, msg))
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def report_extraction(self, id_or_name):
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"""Report information extraction."""
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self.to_screen('%s: Extracting information' % id_or_name)
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def report_download_webpage(self, video_id):
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"""Report webpage download."""
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self.to_screen('%s: Downloading webpage' % video_id)
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def report_age_confirmation(self):
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"""Report attempt to confirm age."""
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self.to_screen('Confirming age')
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def report_login(self):
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"""Report attempt to log in."""
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self.to_screen('Logging in')
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#Methods for following #608
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@staticmethod
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def url_result(url, ie=None, video_id=None):
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"""Returns a url that points to a page that should be processed"""
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#TODO: ie should be the class used for getting the info
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video_info = {'_type': 'url',
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'url': url,
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'ie_key': ie}
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if video_id is not None:
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video_info['id'] = video_id
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return video_info
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@staticmethod
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def playlist_result(entries, playlist_id=None, playlist_title=None):
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"""Returns a playlist"""
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video_info = {'_type': 'playlist',
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'entries': entries}
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if playlist_id:
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video_info['id'] = playlist_id
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if playlist_title:
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video_info['title'] = playlist_title
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return video_info
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def _search_regex(self, pattern, string, name, default=_NO_DEFAULT, fatal=True, flags=0):
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"""
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Perform a regex search on the given string, using a single or a list of
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patterns returning the first matching group.
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In case of failure return a default value or raise a WARNING or a
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RegexNotFoundError, depending on fatal, specifying the field name.
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"""
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if isinstance(pattern, (str, compat_str, compiled_regex_type)):
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mobj = re.search(pattern, string, flags)
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else:
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for p in pattern:
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mobj = re.search(p, string, flags)
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if mobj:
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break
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if os.name != 'nt' and sys.stderr.isatty():
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_name = '\033[0;34m%s\033[0m' % name
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else:
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_name = name
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if mobj:
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# return the first matching group
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return next(g for g in mobj.groups() if g is not None)
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elif default is not _NO_DEFAULT:
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return default
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elif fatal:
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raise RegexNotFoundError('Unable to extract %s' % _name)
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else:
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self._downloader.report_warning('unable to extract %s; '
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'please report this issue on http://yt-dl.org/bug' % _name)
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return None
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def _html_search_regex(self, pattern, string, name, default=_NO_DEFAULT, fatal=True, flags=0):
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"""
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Like _search_regex, but strips HTML tags and unescapes entities.
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"""
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res = self._search_regex(pattern, string, name, default, fatal, flags)
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if res:
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return clean_html(res).strip()
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else:
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return res
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def _get_login_info(self):
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"""
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Get the the login info as (username, password)
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It will look in the netrc file using the _NETRC_MACHINE value
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If there's no info available, return (None, None)
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"""
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if self._downloader is None:
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return (None, None)
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username = None
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password = None
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downloader_params = self._downloader.params
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# Attempt to use provided username and password or .netrc data
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if downloader_params.get('username', None) is not None:
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username = downloader_params['username']
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password = downloader_params['password']
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elif downloader_params.get('usenetrc', False):
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try:
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info = netrc.netrc().authenticators(self._NETRC_MACHINE)
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if info is not None:
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username = info[0]
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password = info[2]
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else:
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raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
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except (IOError, netrc.NetrcParseError) as err:
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self._downloader.report_warning('parsing .netrc: %s' % compat_str(err))
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return (username, password)
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def _get_tfa_info(self):
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"""
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Get the two-factor authentication info
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TODO - asking the user will be required for sms/phone verify
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currently just uses the command line option
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If there's no info available, return None
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"""
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if self._downloader is None:
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return None
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downloader_params = self._downloader.params
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if downloader_params.get('twofactor', None) is not None:
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return downloader_params['twofactor']
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return None
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# Helper functions for extracting OpenGraph info
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@staticmethod
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def _og_regexes(prop):
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content_re = r'content=(?:"([^>]+?)"|\'([^>]+?)\')'
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property_re = r'(?:name|property)=[\'"]og:%s[\'"]' % re.escape(prop)
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template = r'<meta[^>]+?%s[^>]+?%s'
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return [
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template % (property_re, content_re),
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template % (content_re, property_re),
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]
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def _og_search_property(self, prop, html, name=None, **kargs):
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if name is None:
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name = 'OpenGraph %s' % prop
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escaped = self._search_regex(self._og_regexes(prop), html, name, flags=re.DOTALL, **kargs)
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if escaped is None:
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return None
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return unescapeHTML(escaped)
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def _og_search_thumbnail(self, html, **kargs):
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return self._og_search_property('image', html, 'thumbnail url', fatal=False, **kargs)
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def _og_search_description(self, html, **kargs):
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return self._og_search_property('description', html, fatal=False, **kargs)
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def _og_search_title(self, html, **kargs):
|
|
return self._og_search_property('title', html, **kargs)
|
|
|
|
def _og_search_video_url(self, html, name='video url', secure=True, **kargs):
|
|
regexes = self._og_regexes('video') + self._og_regexes('video:url')
|
|
if secure:
|
|
regexes = self._og_regexes('video:secure_url') + regexes
|
|
return self._html_search_regex(regexes, html, name, **kargs)
|
|
|
|
def _og_search_url(self, html, **kargs):
|
|
return self._og_search_property('url', html, **kargs)
|
|
|
|
def _html_search_meta(self, name, html, display_name=None, fatal=False, **kwargs):
|
|
if display_name is None:
|
|
display_name = name
|
|
return self._html_search_regex(
|
|
r'''(?ix)<meta
|
|
(?=[^>]+(?:itemprop|name|property)=["\']?%s["\']?)
|
|
[^>]+content=["\']([^"\']+)["\']''' % re.escape(name),
|
|
html, display_name, fatal=fatal, **kwargs)
|
|
|
|
def _dc_search_uploader(self, html):
|
|
return self._html_search_meta('dc.creator', html, 'uploader')
|
|
|
|
def _rta_search(self, html):
|
|
# See http://www.rtalabel.org/index.php?content=howtofaq#single
|
|
if re.search(r'(?ix)<meta\s+name="rating"\s+'
|
|
r' content="RTA-5042-1996-1400-1577-RTA"',
|
|
html):
|
|
return 18
|
|
return 0
|
|
|
|
def _media_rating_search(self, html):
|
|
# See http://www.tjg-designs.com/WP/metadata-code-examples-adding-metadata-to-your-web-pages/
|
|
rating = self._html_search_meta('rating', html)
|
|
|
|
if not rating:
|
|
return None
|
|
|
|
RATING_TABLE = {
|
|
'safe for kids': 0,
|
|
'general': 8,
|
|
'14 years': 14,
|
|
'mature': 17,
|
|
'restricted': 19,
|
|
}
|
|
return RATING_TABLE.get(rating.lower(), None)
|
|
|
|
def _twitter_search_player(self, html):
|
|
return self._html_search_meta('twitter:player', html,
|
|
'twitter card player')
|
|
|
|
def _sort_formats(self, formats):
|
|
if not formats:
|
|
raise ExtractorError('No video formats found')
|
|
|
|
def _formats_key(f):
|
|
# TODO remove the following workaround
|
|
from ..utils import determine_ext
|
|
if not f.get('ext') and 'url' in f:
|
|
f['ext'] = determine_ext(f['url'])
|
|
|
|
preference = f.get('preference')
|
|
if preference is None:
|
|
proto = f.get('protocol')
|
|
if proto is None:
|
|
proto = compat_urllib_parse_urlparse(f.get('url', '')).scheme
|
|
|
|
preference = 0 if proto in ['http', 'https'] else -0.1
|
|
if f.get('ext') in ['f4f', 'f4m']: # Not yet supported
|
|
preference -= 0.5
|
|
|
|
if f.get('vcodec') == 'none': # audio only
|
|
if self._downloader.params.get('prefer_free_formats'):
|
|
ORDER = ['aac', 'mp3', 'm4a', 'webm', 'ogg', 'opus']
|
|
else:
|
|
ORDER = ['webm', 'opus', 'ogg', 'mp3', 'aac', 'm4a']
|
|
ext_preference = 0
|
|
try:
|
|
audio_ext_preference = ORDER.index(f['ext'])
|
|
except ValueError:
|
|
audio_ext_preference = -1
|
|
else:
|
|
if self._downloader.params.get('prefer_free_formats'):
|
|
ORDER = ['flv', 'mp4', 'webm']
|
|
else:
|
|
ORDER = ['webm', 'flv', 'mp4']
|
|
try:
|
|
ext_preference = ORDER.index(f['ext'])
|
|
except ValueError:
|
|
ext_preference = -1
|
|
audio_ext_preference = 0
|
|
|
|
return (
|
|
preference,
|
|
f.get('quality') if f.get('quality') is not None else -1,
|
|
f.get('height') if f.get('height') is not None else -1,
|
|
f.get('width') if f.get('width') is not None else -1,
|
|
ext_preference,
|
|
f.get('tbr') if f.get('tbr') is not None else -1,
|
|
f.get('vbr') if f.get('vbr') is not None else -1,
|
|
f.get('abr') if f.get('abr') is not None else -1,
|
|
audio_ext_preference,
|
|
f.get('filesize') if f.get('filesize') is not None else -1,
|
|
f.get('filesize_approx') if f.get('filesize_approx') is not None else -1,
|
|
f.get('format_id'),
|
|
)
|
|
formats.sort(key=_formats_key)
|
|
|
|
def http_scheme(self):
|
|
""" Either "https:" or "https:", depending on the user's preferences """
|
|
return (
|
|
'http:'
|
|
if self._downloader.params.get('prefer_insecure', False)
|
|
else 'https:')
|
|
|
|
def _proto_relative_url(self, url, scheme=None):
|
|
if url is None:
|
|
return url
|
|
if url.startswith('//'):
|
|
if scheme is None:
|
|
scheme = self.http_scheme()
|
|
return scheme + url
|
|
else:
|
|
return url
|
|
|
|
def _sleep(self, timeout, video_id, msg_template=None):
|
|
if msg_template is None:
|
|
msg_template = '%(video_id)s: Waiting for %(timeout)s seconds'
|
|
msg = msg_template % {'video_id': video_id, 'timeout': timeout}
|
|
self.to_screen(msg)
|
|
time.sleep(timeout)
|
|
|
|
def _extract_f4m_formats(self, manifest_url, video_id):
|
|
manifest = self._download_xml(
|
|
manifest_url, video_id, 'Downloading f4m manifest',
|
|
'Unable to download f4m manifest')
|
|
|
|
formats = []
|
|
media_nodes = manifest.findall('{http://ns.adobe.com/f4m/1.0}media')
|
|
for i, media_el in enumerate(media_nodes):
|
|
tbr = int_or_none(media_el.attrib.get('bitrate'))
|
|
format_id = 'f4m-%d' % (i if tbr is None else tbr)
|
|
formats.append({
|
|
'format_id': format_id,
|
|
'url': manifest_url,
|
|
'ext': 'flv',
|
|
'tbr': tbr,
|
|
'width': int_or_none(media_el.attrib.get('width')),
|
|
'height': int_or_none(media_el.attrib.get('height')),
|
|
})
|
|
self._sort_formats(formats)
|
|
|
|
return formats
|
|
|
|
def _extract_m3u8_formats(self, m3u8_url, video_id, ext=None):
|
|
formats = [{
|
|
'format_id': 'm3u8-meta',
|
|
'url': m3u8_url,
|
|
'ext': ext,
|
|
'protocol': 'm3u8',
|
|
'preference': -1,
|
|
'resolution': 'multiple',
|
|
'format_note': 'Quality selection URL',
|
|
}]
|
|
|
|
m3u8_doc = self._download_webpage(m3u8_url, video_id)
|
|
last_info = None
|
|
kv_rex = re.compile(
|
|
r'(?P<key>[a-zA-Z_-]+)=(?P<val>"[^"]+"|[^",]+)(?:,|$)')
|
|
for line in m3u8_doc.splitlines():
|
|
if line.startswith('#EXT-X-STREAM-INF:'):
|
|
last_info = {}
|
|
for m in kv_rex.finditer(line):
|
|
v = m.group('val')
|
|
if v.startswith('"'):
|
|
v = v[1:-1]
|
|
last_info[m.group('key')] = v
|
|
elif line.startswith('#') or not line.strip():
|
|
continue
|
|
else:
|
|
if last_info is None:
|
|
formats.append({'url': line})
|
|
continue
|
|
tbr = int_or_none(last_info.get('BANDWIDTH'), scale=1000)
|
|
|
|
f = {
|
|
'format_id': 'm3u8-%d' % (tbr if tbr else len(formats)),
|
|
'url': line.strip(),
|
|
'tbr': tbr,
|
|
'ext': ext,
|
|
}
|
|
codecs = last_info.get('CODECS')
|
|
if codecs:
|
|
# TODO: looks like video codec is not always necessarily goes first
|
|
va_codecs = codecs.split(',')
|
|
if va_codecs[0]:
|
|
f['vcodec'] = va_codecs[0].partition('.')[0]
|
|
if len(va_codecs) > 1 and va_codecs[1]:
|
|
f['acodec'] = va_codecs[1].partition('.')[0]
|
|
resolution = last_info.get('RESOLUTION')
|
|
if resolution:
|
|
width_str, height_str = resolution.split('x')
|
|
f['width'] = int(width_str)
|
|
f['height'] = int(height_str)
|
|
formats.append(f)
|
|
last_info = {}
|
|
self._sort_formats(formats)
|
|
return formats
|
|
|
|
|
|
class SearchInfoExtractor(InfoExtractor):
|
|
"""
|
|
Base class for paged search queries extractors.
|
|
They accept urls in the format _SEARCH_KEY(|all|[0-9]):{query}
|
|
Instances should define _SEARCH_KEY and _MAX_RESULTS.
|
|
"""
|
|
|
|
@classmethod
|
|
def _make_valid_url(cls):
|
|
return r'%s(?P<prefix>|[1-9][0-9]*|all):(?P<query>[\s\S]+)' % cls._SEARCH_KEY
|
|
|
|
@classmethod
|
|
def suitable(cls, url):
|
|
return re.match(cls._make_valid_url(), url) is not None
|
|
|
|
def _real_extract(self, query):
|
|
mobj = re.match(self._make_valid_url(), query)
|
|
if mobj is None:
|
|
raise ExtractorError('Invalid search query "%s"' % query)
|
|
|
|
prefix = mobj.group('prefix')
|
|
query = mobj.group('query')
|
|
if prefix == '':
|
|
return self._get_n_results(query, 1)
|
|
elif prefix == 'all':
|
|
return self._get_n_results(query, self._MAX_RESULTS)
|
|
else:
|
|
n = int(prefix)
|
|
if n <= 0:
|
|
raise ExtractorError('invalid download number %s for query "%s"' % (n, query))
|
|
elif n > self._MAX_RESULTS:
|
|
self._downloader.report_warning('%s returns max %i results (you requested %i)' % (self._SEARCH_KEY, self._MAX_RESULTS, n))
|
|
n = self._MAX_RESULTS
|
|
return self._get_n_results(query, n)
|
|
|
|
def _get_n_results(self, query, n):
|
|
"""Get a specified number of results for a query"""
|
|
raise NotImplementedError("This method must be implemented by subclasses")
|
|
|
|
@property
|
|
def SEARCH_KEY(self):
|
|
return self._SEARCH_KEY
|