mirror of
https://github.com/l1ving/youtube-dl
synced 2024-12-31 01:02:53 +08:00
355 lines
9.8 KiB
Python
355 lines
9.8 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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import gzip
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import htmlentitydefs
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import HTMLParser
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import locale
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import os
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import re
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import sys
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import zlib
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import urllib2
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import email.utils
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import json
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try:
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import cStringIO as StringIO
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except ImportError:
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import StringIO
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std_headers = {
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'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101 Firefox/10.0',
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'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
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'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
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'Accept-Encoding': 'gzip, deflate',
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'Accept-Language': 'en-us,en;q=0.5',
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}
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def preferredencoding():
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"""Get preferred encoding.
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Returns the best encoding scheme for the system, based on
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locale.getpreferredencoding() and some further tweaks.
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"""
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def yield_preferredencoding():
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try:
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pref = locale.getpreferredencoding()
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u'TEST'.encode(pref)
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except:
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pref = 'UTF-8'
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while True:
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yield pref
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return yield_preferredencoding().next()
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def htmlentity_transform(matchobj):
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"""Transforms an HTML entity to a Unicode character.
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This function receives a match object and is intended to be used with
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the re.sub() function.
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"""
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entity = matchobj.group(1)
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# Known non-numeric HTML entity
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if entity in htmlentitydefs.name2codepoint:
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return unichr(htmlentitydefs.name2codepoint[entity])
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# Unicode character
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mobj = re.match(ur'(?u)#(x?\d+)', entity)
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if mobj is not None:
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numstr = mobj.group(1)
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if numstr.startswith(u'x'):
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base = 16
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numstr = u'0%s' % numstr
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else:
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base = 10
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return unichr(long(numstr, base))
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# Unknown entity in name, return its literal representation
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return (u'&%s;' % entity)
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HTMLParser.locatestarttagend = re.compile(r"""<[a-zA-Z][-.a-zA-Z0-9:_]*(?:\s+(?:(?<=['"\s])[^\s/>][^\s/=>]*(?:\s*=+\s*(?:'[^']*'|"[^"]*"|(?!['"])[^>\s]*))?\s*)*)?\s*""", re.VERBOSE) # backport bugfix
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class IDParser(HTMLParser.HTMLParser):
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"""Modified HTMLParser that isolates a tag with the specified id"""
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def __init__(self, id):
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self.id = id
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self.result = None
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self.started = False
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self.depth = {}
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self.html = None
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self.watch_startpos = False
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self.error_count = 0
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HTMLParser.HTMLParser.__init__(self)
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def error(self, message):
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print >> sys.stderr, self.getpos()
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if self.error_count > 10 or self.started:
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raise HTMLParser.HTMLParseError(message, self.getpos())
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self.rawdata = '\n'.join(self.html.split('\n')[self.getpos()[0]:]) # skip one line
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self.error_count += 1
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self.goahead(1)
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def loads(self, html):
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self.html = html
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self.feed(html)
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self.close()
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def handle_starttag(self, tag, attrs):
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attrs = dict(attrs)
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if self.started:
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self.find_startpos(None)
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if 'id' in attrs and attrs['id'] == self.id:
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self.result = [tag]
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self.started = True
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self.watch_startpos = True
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if self.started:
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if not tag in self.depth: self.depth[tag] = 0
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self.depth[tag] += 1
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def handle_endtag(self, tag):
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if self.started:
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if tag in self.depth: self.depth[tag] -= 1
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if self.depth[self.result[0]] == 0:
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self.started = False
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self.result.append(self.getpos())
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def find_startpos(self, x):
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"""Needed to put the start position of the result (self.result[1])
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after the opening tag with the requested id"""
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if self.watch_startpos:
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self.watch_startpos = False
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self.result.append(self.getpos())
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handle_entityref = handle_charref = handle_data = handle_comment = \
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handle_decl = handle_pi = unknown_decl = find_startpos
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def get_result(self):
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if self.result == None: return None
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if len(self.result) != 3: return None
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lines = self.html.split('\n')
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lines = lines[self.result[1][0]-1:self.result[2][0]]
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lines[0] = lines[0][self.result[1][1]:]
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if len(lines) == 1:
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lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
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lines[-1] = lines[-1][:self.result[2][1]]
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return '\n'.join(lines).strip()
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def get_element_by_id(id, html):
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"""Return the content of the tag with the specified id in the passed HTML document"""
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parser = IDParser(id)
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try:
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parser.loads(html)
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except HTMLParser.HTMLParseError:
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pass
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return parser.get_result()
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def clean_html(html):
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"""Clean an HTML snippet into a readable string"""
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# Newline vs <br />
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html = html.replace('\n', ' ')
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html = re.sub('\s*<\s*br\s*/?\s*>\s*', '\n', html)
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# Strip html tags
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html = re.sub('<.*?>', '', html)
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# Replace html entities
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html = unescapeHTML(html)
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return html
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def sanitize_open(filename, open_mode):
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"""Try to open the given filename, and slightly tweak it if this fails.
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Attempts to open the given filename. If this fails, it tries to change
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the filename slightly, step by step, until it's either able to open it
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or it fails and raises a final exception, like the standard open()
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function.
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It returns the tuple (stream, definitive_file_name).
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"""
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try:
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if filename == u'-':
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if sys.platform == 'win32':
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import msvcrt
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msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
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return (sys.stdout, filename)
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stream = open(encodeFilename(filename), open_mode)
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return (stream, filename)
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except (IOError, OSError), err:
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# In case of error, try to remove win32 forbidden chars
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filename = re.sub(ur'[/<>:"\|\?\*]', u'#', filename)
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# An exception here should be caught in the caller
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stream = open(encodeFilename(filename), open_mode)
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return (stream, filename)
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def timeconvert(timestr):
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"""Convert RFC 2822 defined time string into system timestamp"""
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timestamp = None
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timetuple = email.utils.parsedate_tz(timestr)
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if timetuple is not None:
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timestamp = email.utils.mktime_tz(timetuple)
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return timestamp
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def sanitize_filename(s):
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"""Sanitizes a string so it could be used as part of a filename."""
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def replace_insane(char):
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if char in u' .\\/|?*<>:"' or ord(char) < 32:
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return '_'
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return char
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return u''.join(map(replace_insane, s)).strip('_')
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def orderedSet(iterable):
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""" Remove all duplicates from the input iterable """
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res = []
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for el in iterable:
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if el not in res:
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res.append(el)
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return res
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def unescapeHTML(s):
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"""
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@param s a string (of type unicode)
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"""
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assert type(s) == type(u'')
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result = re.sub(ur'(?u)&(.+?);', htmlentity_transform, s)
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return result
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def encodeFilename(s):
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"""
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@param s The name of the file (of type unicode)
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"""
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assert type(s) == type(u'')
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if sys.platform == 'win32' and sys.getwindowsversion()[0] >= 5:
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# Pass u'' directly to use Unicode APIs on Windows 2000 and up
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# (Detecting Windows NT 4 is tricky because 'major >= 4' would
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# match Windows 9x series as well. Besides, NT 4 is obsolete.)
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return s
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else:
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return s.encode(sys.getfilesystemencoding(), 'ignore')
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class DownloadError(Exception):
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"""Download Error exception.
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This exception may be thrown by FileDownloader objects if they are not
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configured to continue on errors. They will contain the appropriate
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error message.
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"""
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pass
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class SameFileError(Exception):
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"""Same File exception.
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This exception will be thrown by FileDownloader objects if they detect
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multiple files would have to be downloaded to the same file on disk.
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"""
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pass
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class PostProcessingError(Exception):
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"""Post Processing exception.
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This exception may be raised by PostProcessor's .run() method to
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indicate an error in the postprocessing task.
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"""
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pass
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class MaxDownloadsReached(Exception):
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""" --max-downloads limit has been reached. """
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pass
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class UnavailableVideoError(Exception):
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"""Unavailable Format exception.
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This exception will be thrown when a video is requested
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in a format that is not available for that video.
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"""
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pass
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class ContentTooShortError(Exception):
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"""Content Too Short exception.
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This exception may be raised by FileDownloader objects when a file they
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download is too small for what the server announced first, indicating
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the connection was probably interrupted.
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"""
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# Both in bytes
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downloaded = None
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expected = None
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def __init__(self, downloaded, expected):
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self.downloaded = downloaded
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self.expected = expected
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class Trouble(Exception):
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"""Trouble helper exception
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This is an exception to be handled with
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FileDownloader.trouble
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"""
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class YoutubeDLHandler(urllib2.HTTPHandler):
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"""Handler for HTTP requests and responses.
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This class, when installed with an OpenerDirector, automatically adds
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the standard headers to every HTTP request and handles gzipped and
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deflated responses from web servers. If compression is to be avoided in
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a particular request, the original request in the program code only has
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to include the HTTP header "Youtubedl-No-Compression", which will be
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removed before making the real request.
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Part of this code was copied from:
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http://techknack.net/python-urllib2-handlers/
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Andrew Rowls, the author of that code, agreed to release it to the
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public domain.
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"""
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@staticmethod
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def deflate(data):
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try:
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return zlib.decompress(data, -zlib.MAX_WBITS)
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except zlib.error:
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return zlib.decompress(data)
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@staticmethod
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def addinfourl_wrapper(stream, headers, url, code):
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if hasattr(urllib2.addinfourl, 'getcode'):
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return urllib2.addinfourl(stream, headers, url, code)
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ret = urllib2.addinfourl(stream, headers, url)
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ret.code = code
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return ret
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def http_request(self, req):
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for h in std_headers:
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if h in req.headers:
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del req.headers[h]
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req.add_header(h, std_headers[h])
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if 'Youtubedl-no-compression' in req.headers:
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if 'Accept-encoding' in req.headers:
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del req.headers['Accept-encoding']
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del req.headers['Youtubedl-no-compression']
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return req
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def http_response(self, req, resp):
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old_resp = resp
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# gzip
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if resp.headers.get('Content-encoding', '') == 'gzip':
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gz = gzip.GzipFile(fileobj=StringIO.StringIO(resp.read()), mode='r')
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resp = self.addinfourl_wrapper(gz, old_resp.headers, old_resp.url, old_resp.code)
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resp.msg = old_resp.msg
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# deflate
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if resp.headers.get('Content-encoding', '') == 'deflate':
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gz = StringIO.StringIO(self.deflate(resp.read()))
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resp = self.addinfourl_wrapper(gz, old_resp.headers, old_resp.url, old_resp.code)
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resp.msg = old_resp.msg
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return resp
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