X-Git-Url: https://git.rapsys.eu/youtubedl/blobdiff_plain/0a3f3e67f98ab8168fc7b80abf00ba5f04302532..15f073e0b73288e237378d6f95d1889d89b87119:/youtube-dl

diff --git a/youtube-dl b/youtube-dl
index 5afff4e..e3eb877 100755
--- a/youtube-dl
+++ b/youtube-dl
@@ -1,1228 +1,89 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-# Author: Ricardo Garcia Gonzalez
-# Author: Danny Colligan
-# License: Public domain code
-import htmlentitydefs
-import httplib
-import locale
-import math
-import netrc
-import os
-import os.path
-import re
-import socket
-import string
-import sys
-import time
-import urllib
-import urllib2
 
-std_headers = {
-	'User-Agent': 'Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2',
-	'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
-	'Accept': 'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5',
-	'Accept-Language': 'en-us,en;q=0.5',
-}
-
-simple_title_chars = string.ascii_letters.decode('ascii') + string.digits.decode('ascii')
-
-def preferredencoding():
-	"""Get preferred encoding.
-
-	Returns the best encoding scheme for the system, based on
-	locale.getpreferredencoding() and some further tweaks.
-	"""
-	try:
-		pref = locale.getpreferredencoding()
-		# Mac OSX systems have this problem sometimes
-		if pref == '':
-			return 'UTF-8'
-		return pref
-	except:
-		sys.stderr.write('WARNING: problem obtaining preferred encoding. Falling back to UTF-8.\n')
-		return 'UTF-8'
-
-class DownloadError(Exception):
-	"""Download Error exception.
-	
-	This exception may be thrown by FileDownloader objects if they are not
-	configured to continue on errors. They will contain the appropriate
-	error message.
-	"""
-	pass
-
-class SameFileError(Exception):
-	"""Same File exception.
-
-	This exception will be thrown by FileDownloader objects if they detect
-	multiple files would have to be downloaded to the same file on disk.
-	"""
-	pass
-
-class PostProcessingError(Exception):
-	"""Post Processing exception.
-
-	This exception may be raised by PostProcessor's .run() method to
-	indicate an error in the postprocessing task.
-	"""
-	pass
-
-class UnavailableFormatError(Exception):
-	"""Unavailable Format exception.
-
-	This exception will be thrown when a video is requested
-	in a format that is not available for that video.
-	"""
-	pass
-
-class ContentTooShortError(Exception):
-	"""Content Too Short exception.
-
-	This exception may be raised by FileDownloader objects when a file they
-	download is too small for what the server announced first, indicating
-	the connection was probably interrupted.
-	"""
-	# Both in bytes
-	downloaded = None
-	expected = None
-
-	def __init__(self, downloaded, expected):
-		self.downloaded = downloaded
-		self.expected = expected
-
-class FileDownloader(object):
-	"""File Downloader class.
-
-	File downloader objects are the ones responsible of downloading the
-	actual video file and writing it to disk if the user has requested
-	it, among some other tasks. In most cases there should be one per
-	program. As, given a video URL, the downloader doesn't know how to
-	extract all the needed information, task that InfoExtractors do, it
-	has to pass the URL to one of them.
-
-	For this, file downloader objects have a method that allows
-	InfoExtractors to be registered in a given order. When it is passed
-	a URL, the file downloader handles it to the first InfoExtractor it
-	finds that reports being able to handle it. The InfoExtractor extracts
-	all the information about the video or videos the URL refers to, and
-	asks the FileDownloader to process the video information, possibly
-	downloading the video.
-
-	File downloaders accept a lot of parameters. In order not to saturate
-	the object constructor with arguments, it receives a dictionary of
-	options instead. These options are available through the params
-	attribute for the InfoExtractors to use. The FileDownloader also
-	registers itself as the downloader in charge for the InfoExtractors
-	that are added to it, so this is a "mutual registration".
-
-	Available options:
-
-	username:	Username for authentication purposes.
-	password:	Password for authentication purposes.
-	usenetrc:	Use netrc for authentication instead.
-	quiet:		Do not print messages to stdout.
-	forceurl:	Force printing final URL.
-	forcetitle:	Force printing title.
-	simulate:	Do not download the video files.
-	format:		Video format code.
-	outtmpl:	Template for output names.
-	ignoreerrors:	Do not stop on download errors.
-	ratelimit:	Download speed limit, in bytes/sec.
-	nooverwrites:	Prevent overwriting files.
-	continuedl:	Try to continue downloads if possible.
-	"""
-
-	params = None
-	_ies = []
-	_pps = []
-	_download_retcode = None
-
-	def __init__(self, params):
-		"""Create a FileDownloader object with the given options."""
-		self._ies = []
-		self._pps = []
-		self._download_retcode = 0
-		self.params = params
-	
-	@staticmethod
-	def pmkdir(filename):
-		"""Create directory components in filename. Similar to Unix "mkdir -p"."""
-		components = filename.split(os.sep)
-		aggregate = [os.sep.join(components[0:x]) for x in xrange(1, len(components))]
-		aggregate = ['%s%s' % (x, os.sep) for x in aggregate] # Finish names with separator
-		for dir in aggregate:
-			if not os.path.exists(dir):
-				os.mkdir(dir)
-	
-	@staticmethod
-	def format_bytes(bytes):
-		if bytes is None:
-			return 'N/A'
-		if type(bytes) is str:
-			bytes = float(bytes)
-		if bytes == 0.0:
-			exponent = 0
-		else:
-			exponent = long(math.log(bytes, 1024.0))
-		suffix = 'bkMGTPEZY'[exponent]
-		converted = float(bytes) / float(1024**exponent)
-		return '%.2f%s' % (converted, suffix)
-
-	@staticmethod
-	def calc_percent(byte_counter, data_len):
-		if data_len is None:
-			return '---.-%'
-		return '%6s' % ('%3.1f%%' % (float(byte_counter) / float(data_len) * 100.0))
-
-	@staticmethod
-	def calc_eta(start, now, total, current):
-		if total is None:
-			return '--:--'
-		dif = now - start
-		if current == 0 or dif < 0.001: # One millisecond
-			return '--:--'
-		rate = float(current) / dif
-		eta = long((float(total) - float(current)) / rate)
-		(eta_mins, eta_secs) = divmod(eta, 60)
-		if eta_mins > 99:
-			return '--:--'
-		return '%02d:%02d' % (eta_mins, eta_secs)
-
-	@staticmethod
-	def calc_speed(start, now, bytes):
-		dif = now - start
-		if bytes == 0 or dif < 0.001: # One millisecond
-			return '%10s' % '---b/s'
-		return '%10s' % ('%s/s' % FileDownloader.format_bytes(float(bytes) / dif))
-
-	@staticmethod
-	def best_block_size(elapsed_time, bytes):
-		new_min = max(bytes / 2.0, 1.0)
-		new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
-		if elapsed_time < 0.001:
-			return long(new_max)
-		rate = bytes / elapsed_time
-		if rate > new_max:
-			return long(new_max)
-		if rate < new_min:
-			return long(new_min)
-		return long(rate)
-
-	@staticmethod
-	def parse_bytes(bytestr):
-		"""Parse a string indicating a byte quantity into a long integer."""
-		matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
-		if matchobj is None:
-			return None
-		number = float(matchobj.group(1))
-		multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
-		return long(round(number * multiplier))
-
-	@staticmethod
-	def verify_url(url):
-		"""Verify a URL is valid and data could be downloaded. Return real data URL."""
-		request = urllib2.Request(url, None, std_headers)
-		data = urllib2.urlopen(request)
-		data.read(1)
-		url = data.geturl()
-		data.close()
-		return url
-
-	def add_info_extractor(self, ie):
-		"""Add an InfoExtractor object to the end of the list."""
-		self._ies.append(ie)
-		ie.set_downloader(self)
-	
-	def add_post_processor(self, pp):
-		"""Add a PostProcessor object to the end of the chain."""
-		self._pps.append(pp)
-		pp.set_downloader(self)
-	
-	def to_stdout(self, message, skip_eol=False):
-		"""Print message to stdout if not in quiet mode."""
-		if not self.params.get('quiet', False):
-			print (u'%s%s' % (message, [u'\n', u''][skip_eol])).encode(preferredencoding()),
-			sys.stdout.flush()
-	
-	def to_stderr(self, message):
-		"""Print message to stderr."""
-		print >>sys.stderr, message.encode(preferredencoding())
-	
-	def fixed_template(self):
-		"""Checks if the output template is fixed."""
-		return (re.search(ur'(?u)%\(.+?\)s', self.params['outtmpl']) is None)
-
-	def trouble(self, message=None):
-		"""Determine action to take when a download problem appears.
-
-		Depending on if the downloader has been configured to ignore
-		download errors or not, this method may throw an exception or
-		not when errors are found, after printing the message.
-		"""
-		if message is not None:
-			self.to_stderr(message)
-		if not self.params.get('ignoreerrors', False):
-			raise DownloadError(message)
-		self._download_retcode = 1
-
-	def slow_down(self, start_time, byte_counter):
-		"""Sleep if the download speed is over the rate limit."""
-		rate_limit = self.params.get('ratelimit', None)
-		if rate_limit is None or byte_counter == 0:
-			return
-		now = time.time()
-		elapsed = now - start_time
-		if elapsed <= 0.0:
-			return
-		speed = float(byte_counter) / elapsed
-		if speed > rate_limit:
-			time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
-
-	def report_destination(self, filename):
-		"""Report destination filename."""
-		self.to_stdout(u'[download] Destination: %s' % filename)
-	
-	def report_progress(self, percent_str, data_len_str, speed_str, eta_str):
-		"""Report download progress."""
-		self.to_stdout(u'\r[download] %s of %s at %s ETA %s' %
-				(percent_str, data_len_str, speed_str, eta_str), skip_eol=True)
-
-	def report_resuming_byte(self, resume_len):
-		"""Report attemtp to resume at given byte."""
-		self.to_stdout(u'[download] Resuming download at byte %s' % resume_len)
-	
-	def report_file_already_downloaded(self, file_name):
-		"""Report file has already been fully downloaded."""
-		self.to_stdout(u'[download] %s has already been downloaded' % file_name)
-	
-	def report_unable_to_resume(self):
-		"""Report it was impossible to resume download."""
-		self.to_stdout(u'[download] Unable to resume')
-	
-	def report_finish(self):
-		"""Report download finished."""
-		self.to_stdout(u'')
-
-	def process_info(self, info_dict):
-		"""Process a single dictionary returned by an InfoExtractor."""
-		# Do nothing else if in simulate mode
-		if self.params.get('simulate', False):
-			try:
-				info_dict['url'] = self.verify_url(info_dict['url'])
-			except (OSError, IOError, urllib2.URLError, httplib.HTTPException, socket.error), err:
-				raise UnavailableFormatError
-
-			# Forced printings
-			if self.params.get('forcetitle', False):
-				print info_dict['title'].encode(preferredencoding())
-			if self.params.get('forceurl', False):
-				print info_dict['url'].encode(preferredencoding())
-
-			return
-			
-		try:
-			template_dict = dict(info_dict)
-			template_dict['epoch'] = unicode(long(time.time()))
-			filename = self.params['outtmpl'] % template_dict
-		except (ValueError, KeyError), err:
-			self.trouble('ERROR: invalid output template or system charset: %s' % str(err))
-		if self.params['nooverwrites'] and os.path.exists(filename):
-			self.to_stderr(u'WARNING: file exists: %s; skipping' % filename)
-			return
-
-		try:
-			self.pmkdir(filename)
-		except (OSError, IOError), err:
-			self.trouble('ERROR: unable to create directories: %s' % str(err))
-			return
-
-		try:
-			success = self._do_download(filename, info_dict['url'])
-		except (OSError, IOError), err:
-			raise UnavailableFormatError
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self.trouble('ERROR: unable to download video data: %s' % str(err))
-			return
-		except (ContentTooShortError, ), err:
-			self.trouble('ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
-			return
-
-		if success:
-			try:
-				self.post_process(filename, info_dict)
-			except (PostProcessingError), err:
-				self.trouble('ERROR: postprocessing: %s' % str(err))
-				return
-
-	def download(self, url_list):
-		"""Download a given list of URLs."""
-		if len(url_list) > 1 and self.fixed_template():
-			raise SameFileError(self.params['outtmpl'])
-
-		for url in url_list:
-			suitable_found = False
-			for ie in self._ies:
-				# Go to next InfoExtractor if not suitable
-				if not ie.suitable(url):
-					continue
-
-				# Suitable InfoExtractor found
-				suitable_found = True
-
-				# Extract information from URL and process it
-				ie.extract(url)
-
-				# Suitable InfoExtractor had been found; go to next URL
-				break
-
-			if not suitable_found:
-				self.trouble('ERROR: no suitable InfoExtractor: %s' % url)
-
-		return self._download_retcode
-
-	def post_process(self, filename, ie_info):
-		"""Run the postprocessing chain on the given file."""
-		info = dict(ie_info)
-		info['filepath'] = filename
-		for pp in self._pps:
-			info = pp.run(info)
-			if info is None:
-				break
-	
-	def _do_download(self, filename, url):
-		stream = None
-		open_mode = 'ab'
-
-		basic_request = urllib2.Request(url, None, std_headers)
-		request = urllib2.Request(url, None, std_headers)
-
-		# Attempt to resume download with "continuedl" option
-		if os.path.isfile(filename):
-			resume_len = os.path.getsize(filename)
-		else:
-			resume_len = 0
-		if self.params['continuedl'] and resume_len != 0:
-			self.report_resuming_byte(resume_len)
-			request.add_header('Range','bytes=%d-' % resume_len)
-
-		# Establish connection
-		try:
-			data = urllib2.urlopen(request)
-		except (urllib2.HTTPError, ), err:
-			if err.code != 416: #  416 is 'Requested range not satisfiable'
-				raise
-			data = urllib2.urlopen(basic_request)
-			content_length = data.info()['Content-Length']
-			if content_length is not None and long(content_length) == resume_len:
-				self.report_file_already_downloaded(filename)
-				return True
-			else:
-				self.report_unable_to_resume()
-				open_mode = 'wb'
-
-		data_len = data.info().get('Content-length', None)
-		data_len_str = self.format_bytes(data_len)
-		byte_counter = 0
-		block_size = 1024
-		start = time.time()
-		while True:
-			# Download and write
-			before = time.time()
-			data_block = data.read(block_size)
-			after = time.time()
-			data_block_len = len(data_block)
-			if data_block_len == 0:
-				break
-			byte_counter += data_block_len
-
-			# Open file just in time
-			if stream is None:
-				try:
-					stream = open(filename, open_mode)
-					self.report_destination(filename)
-				except (OSError, IOError), err:
-					self.trouble('ERROR: unable to open for writing: %s' % str(err))
-					return False
-			stream.write(data_block)
-			block_size = self.best_block_size(after - before, data_block_len)
-
-			# Progress message
-			percent_str = self.calc_percent(byte_counter, data_len)
-			eta_str = self.calc_eta(start, time.time(), data_len, byte_counter)
-			speed_str = self.calc_speed(start, time.time(), byte_counter)
-			self.report_progress(percent_str, data_len_str, speed_str, eta_str)
-
-			# Apply rate limit
-			self.slow_down(start, byte_counter)
-
-		self.report_finish()
-		if data_len is not None and str(byte_counter) != data_len:
-			raise ContentTooShortError(byte_counter, long(data_len))
-		return True
-
-class InfoExtractor(object):
-	"""Information Extractor class.
-
-	Information extractors are the classes that, given a URL, extract
-	information from the video (or videos) the URL refers to. This
-	information includes the real video URL, the video title and simplified
-	title, author and others. The information is stored in a dictionary
-	which is then passed to the FileDownloader. The FileDownloader
-	processes this information possibly downloading the video to the file
-	system, among other possible outcomes. The dictionaries must include
-	the following fields:
-
-	id:		Video identifier.
-	url:		Final video URL.
-	uploader:	Nickname of the video uploader.
-	title:		Literal title.
-	stitle:		Simplified title.
-	ext:		Video filename extension.
-
-	Subclasses of this one should re-define the _real_initialize() and
-	_real_extract() methods, as well as the suitable() static method.
-	Probably, they should also be instantiated and added to the main
-	downloader.
-	"""
-
-	_ready = False
-	_downloader = None
-
-	def __init__(self, downloader=None):
-		"""Constructor. Receives an optional downloader."""
-		self._ready = False
-		self.set_downloader(downloader)
-
-	@staticmethod
-	def suitable(url):
-		"""Receives a URL and returns True if suitable for this IE."""
-		return False
-
-	def initialize(self):
-		"""Initializes an instance (authentication, etc)."""
-		if not self._ready:
-			self._real_initialize()
-			self._ready = True
-
-	def extract(self, url):
-		"""Extracts URL information and returns it in list of dicts."""
-		self.initialize()
-		return self._real_extract(url)
-
-	def set_downloader(self, downloader):
-		"""Sets the downloader for this IE."""
-		self._downloader = downloader
-	
-	def _real_initialize(self):
-		"""Real initialization process. Redefine in subclasses."""
-		pass
-
-	def _real_extract(self, url):
-		"""Real extraction process. Redefine in subclasses."""
-		pass
-
-class YoutubeIE(InfoExtractor):
-	"""Information extractor for youtube.com."""
-
-	_VALID_URL = r'^((?:http://)?(?:\w+\.)?youtube\.com/(?:(?:v/)|(?:(?:watch(?:\.php)?)?\?(?:.+&)?v=)))?([0-9A-Za-z_-]+)(?(1).+)?$'
-	_LANG_URL = r'http://uk.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
-	_LOGIN_URL = 'http://www.youtube.com/signup?next=/&gl=US&hl=en'
-	_AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
-	_NETRC_MACHINE = 'youtube'
-	_available_formats = ['22', '35', '18', '5', '17', '13', None] # listed in order of priority for -b flag
-	_video_extensions = {
-		'13': '3gp',
-		'17': 'mp4',
-		'18': 'mp4',
-		'22': 'mp4',
-	}
-
-	@staticmethod
-	def suitable(url):
-		return (re.match(YoutubeIE._VALID_URL, url) is not None)
-
-	@staticmethod
-	def htmlentity_transform(matchobj):
-		"""Transforms an HTML entity to a Unicode character."""
-		entity = matchobj.group(1)
-
-		# Known non-numeric HTML entity
-		if entity in htmlentitydefs.name2codepoint:
-			return unichr(htmlentitydefs.name2codepoint[entity])
-
-		# Unicode character
-		mobj = re.match(ur'(?u)#(x?\d+)', entity)
-		if mobj is not None:
-			numstr = mobj.group(1)
-			if numstr.startswith(u'x'):
-				base = 16
-				numstr = u'0%s' % numstr
-			else:
-				base = 10
-			return unichr(long(numstr, base))
-
-		# Unknown entity in name, return its literal representation
-		return (u'&%s;' % entity)
-
-	def report_lang(self):
-		"""Report attempt to set language."""
-		self._downloader.to_stdout(u'[youtube] Setting language')
-
-	def report_login(self):
-		"""Report attempt to log in."""
-		self._downloader.to_stdout(u'[youtube] Logging in')
-	
-	def report_age_confirmation(self):
-		"""Report attempt to confirm age."""
-		self._downloader.to_stdout(u'[youtube] Confirming age')
-	
-	def report_video_info_webpage_download(self, video_id):
-		"""Report attempt to download video info webpage."""
-		self._downloader.to_stdout(u'[youtube] %s: Downloading video info webpage' % video_id)
-	
-	def report_information_extraction(self, video_id):
-		"""Report attempt to extract video information."""
-		self._downloader.to_stdout(u'[youtube] %s: Extracting video information' % video_id)
-	
-	def report_unavailable_format(self, video_id, format):
-		"""Report extracted video URL."""
-		self._downloader.to_stdout(u'[youtube] %s: Format %s not available' % (video_id, format))
-	
-	def _real_initialize(self):
-		if self._downloader is None:
-			return
-
-		username = None
-		password = None
-		downloader_params = self._downloader.params
-
-		# Attempt to use provided username and password or .netrc data
-		if downloader_params.get('username', None) is not None:
-			username = downloader_params['username']
-			password = downloader_params['password']
-		elif downloader_params.get('usenetrc', False):
-			try:
-				info = netrc.netrc().authenticators(self._NETRC_MACHINE)
-				if info is not None:
-					username = info[0]
-					password = info[2]
-				else:
-					raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
-			except (IOError, netrc.NetrcParseError), err:
-				self._downloader.to_stderr(u'WARNING: parsing .netrc: %s' % str(err))
-				return
-
-		# Set language
-		request = urllib2.Request(self._LANG_URL, None, std_headers)
-		try:
-			self.report_lang()
-			urllib2.urlopen(request).read()
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.to_stderr(u'WARNING: unable to set language: %s' % str(err))
-			return
-
-		# No authentication to be performed
-		if username is None:
-			return
-
-		# Log in
-		login_form = {
-				'current_form': 'loginForm',
-				'next':		'/',
-				'action_login':	'Log In',
-				'username':	username,
-				'password':	password,
-				}
-		request = urllib2.Request(self._LOGIN_URL, urllib.urlencode(login_form), std_headers)
-		try:
-			self.report_login()
-			login_results = urllib2.urlopen(request).read()
-			if re.search(r'(?i)<form[^>]* name="loginForm"', login_results) is not None:
-				self._downloader.to_stderr(u'WARNING: unable to log in: bad username or password')
-				return
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.to_stderr(u'WARNING: unable to log in: %s' % str(err))
-			return
-	
-		# Confirm age
-		age_form = {
-				'next_url':		'/',
-				'action_confirm':	'Confirm',
-				}
-		request = urllib2.Request(self._AGE_URL, urllib.urlencode(age_form), std_headers)
-		try:
-			self.report_age_confirmation()
-			age_results = urllib2.urlopen(request).read()
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.trouble(u'ERROR: unable to confirm age: %s' % str(err))
-			return
-
-	def _real_extract(self, url):
-		# Extract video id from URL
-		mobj = re.match(self._VALID_URL, url)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: invalid URL: %s' % url)
-			return
-		video_id = mobj.group(2)
-
-		# Downloader parameters
-		best_quality = False
-		format_param = None
-		quality_index = 0
-		if self._downloader is not None:
-			params = self._downloader.params
-			format_param = params.get('format', None)
-			if format_param == '0':
-				format_param = self._available_formats[quality_index]
-				best_quality = True
-
-		while True:
-			# Extension
-			video_extension = self._video_extensions.get(format_param, 'flv')
-
-			# Get video info
-			video_info_url = 'http://www.youtube.com/get_video_info?&video_id=%s&el=detailpage&ps=default&eurl=&gl=US&hl=en' % video_id
-			request = urllib2.Request(video_info_url, None, std_headers)
-			try:
-				self.report_video_info_webpage_download(video_id)
-				video_info_webpage = urllib2.urlopen(request).read()
-			except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-				self._downloader.trouble(u'ERROR: unable to download video info webpage: %s' % str(err))
-				return
-			self.report_information_extraction(video_id)
-
-			# "t" param
-			mobj = re.search(r'(?m)&token=([^&]+)(?:&|$)', video_info_webpage)
-			if mobj is None:
-				# Attempt to see if YouTube has issued an error message
-				mobj = re.search(r'(?m)&reason=([^&]+)(?:&|$)', video_info_webpage)
-				if mobj is None:
-					self._downloader.trouble(u'ERROR: unable to extract "t" parameter for unknown reason')
-					stream = open('reportme-ydl-%s.dat' % time.time(), 'wb')
-					stream.write(video_info_webpage)
-					stream.close()
-				else:
-					reason = urllib.unquote_plus(mobj.group(1))
-					self._downloader.trouble(u'ERROR: YouTube said: %s' % reason.decode('utf-8'))
-				return
-			token = urllib.unquote(mobj.group(1))
-			video_real_url = 'http://www.youtube.com/get_video?video_id=%s&t=%s&eurl=&el=detailpage&ps=default&gl=US&hl=en' % (video_id, token)
-			if format_param is not None:
-				video_real_url = '%s&fmt=%s' % (video_real_url, format_param)
-
-			# uploader
-			mobj = re.search(r'(?m)&author=([^&]+)(?:&|$)', video_info_webpage)
-			if mobj is None:
-				self._downloader.trouble(u'ERROR: unable to extract uploader nickname')
-				return
-			video_uploader = urllib.unquote(mobj.group(1))
-
-			# title
-			mobj = re.search(r'(?m)&title=([^&]+)(?:&|$)', video_info_webpage)
-			if mobj is None:
-				self._downloader.trouble(u'ERROR: unable to extract video title')
-				return
-			video_title = urllib.unquote(mobj.group(1))
-			video_title = video_title.decode('utf-8')
-			video_title = re.sub(ur'(?u)&(.+?);', self.htmlentity_transform, video_title)
-			video_title = video_title.replace(os.sep, u'%')
-
-			# simplified title
-			simple_title = re.sub(ur'(?u)([^%s]+)' % simple_title_chars, ur'_', video_title)
-			simple_title = simple_title.strip(ur'_')
-
-			try:
-				# Process video information
-				self._downloader.process_info({
-					'id':		video_id.decode('utf-8'),
-					'url':		video_real_url.decode('utf-8'),
-					'uploader':	video_uploader.decode('utf-8'),
-					'title':	video_title,
-					'stitle':	simple_title,
-					'ext':		video_extension.decode('utf-8'),
-				})
-
-				return
-
-			except UnavailableFormatError, err:
-				if best_quality:
-					if quality_index == len(self._available_formats) - 1:
-						# I don't ever expect this to happen
-						self._downloader.trouble(u'ERROR: no known formats available for video')
-						return
-					else:
-						self.report_unavailable_format(video_id, format_param)
-						quality_index += 1
-						format_param = self._available_formats[quality_index]
-						continue
-				else: 
-					self._downloader.trouble('ERROR: format not available for video')
-					return
-
-
-class MetacafeIE(InfoExtractor):
-	"""Information Extractor for metacafe.com."""
-
-	_VALID_URL = r'(?:http://)?(?:www\.)?metacafe\.com/watch/([^/]+)/([^/]+)/.*'
-	_DISCLAIMER = 'http://www.metacafe.com/family_filter/'
-	_FILTER_POST = 'http://www.metacafe.com/f/index.php?inputType=filter&controllerGroup=user'
-	_youtube_ie = None
-
-	def __init__(self, youtube_ie, downloader=None):
-		InfoExtractor.__init__(self, downloader)
-		self._youtube_ie = youtube_ie
-
-	@staticmethod
-	def suitable(url):
-		return (re.match(MetacafeIE._VALID_URL, url) is not None)
-
-	def report_disclaimer(self):
-		"""Report disclaimer retrieval."""
-		self._downloader.to_stdout(u'[metacafe] Retrieving disclaimer')
-
-	def report_age_confirmation(self):
-		"""Report attempt to confirm age."""
-		self._downloader.to_stdout(u'[metacafe] Confirming age')
-	
-	def report_download_webpage(self, video_id):
-		"""Report webpage download."""
-		self._downloader.to_stdout(u'[metacafe] %s: Downloading webpage' % video_id)
-	
-	def report_extraction(self, video_id):
-		"""Report information extraction."""
-		self._downloader.to_stdout(u'[metacafe] %s: Extracting information' % video_id)
-
-	def _real_initialize(self):
-		# Retrieve disclaimer
-		request = urllib2.Request(self._DISCLAIMER, None, std_headers)
-		try:
-			self.report_disclaimer()
-			disclaimer = urllib2.urlopen(request).read()
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.trouble(u'ERROR: unable to retrieve disclaimer: %s' % str(err))
-			return
-
-		# Confirm age
-		disclaimer_form = {
-			'filters': '0',
-			'submit': "Continue - I'm over 18",
-			}
-		request = urllib2.Request(self._FILTER_POST, urllib.urlencode(disclaimer_form), std_headers)
-		try:
-			self.report_age_confirmation()
-			disclaimer = urllib2.urlopen(request).read()
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.trouble(u'ERROR: unable to confirm age: %s' % str(err))
-			return
-	
-	def _real_extract(self, url):
-		# Extract id and simplified title from URL
-		mobj = re.match(self._VALID_URL, url)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: invalid URL: %s' % url)
-			return
-
-		video_id = mobj.group(1)
-
-		# Check if video comes from YouTube
-		mobj2 = re.match(r'^yt-(.*)$', video_id)
-		if mobj2 is not None:
-			self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % mobj2.group(1))
-			return
-
-		simple_title = mobj.group(2).decode('utf-8')
-		video_extension = 'flv'
-
-		# Retrieve video webpage to extract further information
-		request = urllib2.Request('http://www.metacafe.com/watch/%s/' % video_id)
-		try:
-			self.report_download_webpage(video_id)
-			webpage = urllib2.urlopen(request).read()
-		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			self._downloader.trouble(u'ERROR: unable retrieve video webpage: %s' % str(err))
-			return
-
-		# Extract URL, uploader and title from webpage
-		self.report_extraction(video_id)
-		mobj = re.search(r'(?m)&mediaURL=([^&]+)', webpage)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: unable to extract media URL')
-			return
-		mediaURL = urllib.unquote(mobj.group(1))
-
-		#mobj = re.search(r'(?m)&gdaKey=(.*?)&', webpage)
-		#if mobj is None:
-		#	self._downloader.trouble(u'ERROR: unable to extract gdaKey')
-		#	return
-		#gdaKey = mobj.group(1)
-		#
-		#video_url = '%s?__gda__=%s' % (mediaURL, gdaKey)
-
-		video_url = mediaURL
-
-		mobj = re.search(r'(?im)<title>(.*) - Video</title>', webpage)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: unable to extract title')
-			return
-		video_title = mobj.group(1).decode('utf-8')
-
-		mobj = re.search(r'(?ms)<li id="ChnlUsr">.*?Submitter:.*?<a .*?>(.*?)<', webpage)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: unable to extract uploader nickname')
-			return
-		video_uploader = mobj.group(1)
-
-		try:
-			# Process video information
-			self._downloader.process_info({
-				'id':		video_id.decode('utf-8'),
-				'url':		video_url.decode('utf-8'),
-				'uploader':	video_uploader.decode('utf-8'),
-				'title':	video_title,
-				'stitle':	simple_title,
-				'ext':		video_extension.decode('utf-8'),
-			})
-		except UnavailableFormatError:
-			self._downloader.trouble(u'ERROR: format not available for video')
-
-
-class YoutubeSearchIE(InfoExtractor):
-	"""Information Extractor for YouTube search queries."""
-	_VALID_QUERY = r'ytsearch(\d+|all)?:[\s\S]+'
-	_TEMPLATE_URL = 'http://www.youtube.com/results?search_query=%s&page=%s&gl=US&hl=en'
-	_VIDEO_INDICATOR = r'href="/watch\?v=.+?"'
-	_MORE_PAGES_INDICATOR = r'(?m)>\s*Next\s*</a>'
-	_youtube_ie = None
-	_max_youtube_results = 1000
-
-	def __init__(self, youtube_ie, downloader=None):
-		InfoExtractor.__init__(self, downloader)
-		self._youtube_ie = youtube_ie
-	
-	@staticmethod
-	def suitable(url):
-		return (re.match(YoutubeSearchIE._VALID_QUERY, url) is not None)
-
-	def report_download_page(self, query, pagenum):
-		"""Report attempt to download playlist page with given number."""
-		self._downloader.to_stdout(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
-
-	def _real_initialize(self):
-		self._youtube_ie.initialize()
-	
-	def _real_extract(self, query):
-		mobj = re.match(self._VALID_QUERY, query)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: invalid search query "%s"' % query)
-			return
-
-		prefix, query = query.split(':')
-		prefix = prefix[8:]
-		if prefix == '':
-			self._download_n_results(query, 1)
-			return
-		elif prefix == 'all':
-			self._download_n_results(query, self._max_youtube_results)
-			return
-		else:
-			try:
-				n = long(prefix)
-				if n <= 0:
-					self._downloader.trouble(u'ERROR: invalid download number %s for query "%s"' % (n, query))
-					return
-				elif n > self._max_youtube_results:
-					self._downloader.to_stderr(u'WARNING: ytsearch returns max %i results (you requested %i)'  % (self._max_youtube_results, n))
-					n = self._max_youtube_results
-				self._download_n_results(query, n)
-				return
-			except ValueError: # parsing prefix as integer fails
-				self._download_n_results(query, 1)
-				return
-
-	def _download_n_results(self, query, n):
-		"""Downloads a specified number of results for a query"""
-
-		video_ids = []
-		already_seen = set()
-		pagenum = 1
-
-		while True:
-			self.report_download_page(query, pagenum)
-			result_url = self._TEMPLATE_URL % (urllib.quote_plus(query), pagenum)
-			request = urllib2.Request(result_url, None, std_headers)
-			try:
-				page = urllib2.urlopen(request).read()
-			except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-				self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
-				return
-
-			# Extract video identifiers
-			for mobj in re.finditer(self._VIDEO_INDICATOR, page):
-				video_id = page[mobj.span()[0]:mobj.span()[1]].split('=')[2][:-1]
-				if video_id not in already_seen:
-					video_ids.append(video_id)
-					already_seen.add(video_id)
-					if len(video_ids) == n:
-						# Specified n videos reached
-						for id in video_ids:
-							self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
-						return
-
-			if re.search(self._MORE_PAGES_INDICATOR, page) is None:
-				for id in video_ids:
-					self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
-				return
-
-			pagenum = pagenum + 1
-
-class YoutubePlaylistIE(InfoExtractor):
-	"""Information Extractor for YouTube playlists."""
-
-	_VALID_URL = r'(?:http://)?(?:\w+\.)?youtube.com/(?:view_play_list|my_playlists)\?.*?p=([^&]+).*'
-	_TEMPLATE_URL = 'http://www.youtube.com/view_play_list?p=%s&page=%s&gl=US&hl=en'
-	_VIDEO_INDICATOR = r'/watch\?v=(.+?)&'
-	_MORE_PAGES_INDICATOR = r'/view_play_list?p=%s&page=%s'
-	_youtube_ie = None
-
-	def __init__(self, youtube_ie, downloader=None):
-		InfoExtractor.__init__(self, downloader)
-		self._youtube_ie = youtube_ie
-	
-	@staticmethod
-	def suitable(url):
-		return (re.match(YoutubePlaylistIE._VALID_URL, url) is not None)
-
-	def report_download_page(self, playlist_id, pagenum):
-		"""Report attempt to download playlist page with given number."""
-		self._downloader.to_stdout(u'[youtube] PL %s: Downloading page #%s' % (playlist_id, pagenum))
-
-	def _real_initialize(self):
-		self._youtube_ie.initialize()
-	
-	def _real_extract(self, url):
-		# Extract playlist id
-		mobj = re.match(self._VALID_URL, url)
-		if mobj is None:
-			self._downloader.trouble(u'ERROR: invalid url: %s' % url)
-			return
-
-		# Download playlist pages
-		playlist_id = mobj.group(1)
-		video_ids = []
-		pagenum = 1
-
-		while True:
-			self.report_download_page(playlist_id, pagenum)
-			request = urllib2.Request(self._TEMPLATE_URL % (playlist_id, pagenum), None, std_headers)
-			try:
-				page = urllib2.urlopen(request).read()
-			except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-				self._downloader.trouble(u'ERROR: unable to download webpage: %s' % str(err))
-				return
-
-			# Extract video identifiers
-			ids_in_page = []
-			for mobj in re.finditer(self._VIDEO_INDICATOR, page):
-				if mobj.group(1) not in ids_in_page:
-					ids_in_page.append(mobj.group(1))
-			video_ids.extend(ids_in_page)
-
-			if (self._MORE_PAGES_INDICATOR % (playlist_id.upper(), pagenum + 1)) not in page:
-				break
-			pagenum = pagenum + 1
-
-		for id in video_ids:
-			self._youtube_ie.extract('http://www.youtube.com/watch?v=%s' % id)
-		return
-
-class PostProcessor(object):
-	"""Post Processor class.
-
-	PostProcessor objects can be added to downloaders with their
-	add_post_processor() method. When the downloader has finished a
-	successful download, it will take its internal chain of PostProcessors
-	and start calling the run() method on each one of them, first with
-	an initial argument and then with the returned value of the previous
-	PostProcessor.
-
-	The chain will be stopped if one of them ever returns None or the end
-	of the chain is reached.
-
-	PostProcessor objects follow a "mutual registration" process similar
-	to InfoExtractor objects.
-	"""
-
-	_downloader = None
-
-	def __init__(self, downloader=None):
-		self._downloader = downloader
-
-	def set_downloader(self, downloader):
-		"""Sets the downloader for this PP."""
-		self._downloader = downloader
-	
-	def run(self, information):
-		"""Run the PostProcessor.
-
-		The "information" argument is a dictionary like the ones
-		composed by InfoExtractors. The only difference is that this
-		one has an extra field called "filepath" that points to the
-		downloaded file.
-
-		When this method returns None, the postprocessing chain is
-		stopped. However, this method may return an information
-		dictionary that will be passed to the next postprocessing
-		object in the chain. It can be the one it received after
-		changing some fields.
-
-		In addition, this method may raise a PostProcessingError
-		exception that will be taken into account by the downloader
-		it was called from.
-		"""
-		return information # by default, do nothing
-	
-### MAIN PROGRAM ###
-if __name__ == '__main__':
-	try:
-		# Modules needed only when running the main program
-		import getpass
-		import optparse
-
-		# General configuration
-		urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler()))
-		urllib2.install_opener(urllib2.build_opener(urllib2.HTTPCookieProcessor()))
-		socket.setdefaulttimeout(300) # 5 minutes should be enough (famous last words)
-
-		# Parse command line
-		parser = optparse.OptionParser(
-			usage='Usage: %prog [options] url...',
-			version='2009.09.13',
-			conflict_handler='resolve',
-		)
-
-		parser.add_option('-h', '--help',
-				action='help', help='print this help text and exit')
-		parser.add_option('-v', '--version',
-				action='version', help='print program version and exit')
-		parser.add_option('-i', '--ignore-errors',
-				action='store_true', dest='ignoreerrors', help='continue on download errors', default=False)
-		parser.add_option('-r', '--rate-limit',
-				dest='ratelimit', metavar='L', help='download rate limit (e.g. 50k or 44.6m)')
-
-		authentication = optparse.OptionGroup(parser, 'Authentication Options')
-		authentication.add_option('-u', '--username',
-				dest='username', metavar='UN', help='account username')
-		authentication.add_option('-p', '--password',
-				dest='password', metavar='PW', help='account password')
-		authentication.add_option('-n', '--netrc',
-				action='store_true', dest='usenetrc', help='use .netrc authentication data', default=False)
-		parser.add_option_group(authentication)
-
-		video_format = optparse.OptionGroup(parser, 'Video Format Options')
-		video_format.add_option('-f', '--format',
-				action='store', dest='format', metavar='FMT', help='video format code')
-		video_format.add_option('-b', '--best-quality',
-				action='store_const', dest='format', help='download the best quality video possible', const='0')
-		video_format.add_option('-m', '--mobile-version',
-				action='store_const', dest='format', help='alias for -f 17', const='17')
-		video_format.add_option('-d', '--high-def',
-				action='store_const', dest='format', help='alias for -f 22', const='22')
-		parser.add_option_group(video_format)
-
-		verbosity = optparse.OptionGroup(parser, 'Verbosity / Simulation Options')
-		verbosity.add_option('-q', '--quiet',
-				action='store_true', dest='quiet', help='activates quiet mode', default=False)
-		verbosity.add_option('-s', '--simulate',
-				action='store_true', dest='simulate', help='do not download video', default=False)
-		verbosity.add_option('-g', '--get-url',
-				action='store_true', dest='geturl', help='simulate, quiet but print URL', default=False)
-		verbosity.add_option('-e', '--get-title',
-				action='store_true', dest='gettitle', help='simulate, quiet but print title', default=False)
-		parser.add_option_group(verbosity)
-
-		filesystem = optparse.OptionGroup(parser, 'Filesystem Options')
-		filesystem.add_option('-t', '--title',
-				action='store_true', dest='usetitle', help='use title in file name', default=False)
-		filesystem.add_option('-l', '--literal',
-				action='store_true', dest='useliteral', help='use literal title in file name', default=False)
-		filesystem.add_option('-o', '--output',
-				dest='outtmpl', metavar='TPL', help='output filename template')
-		filesystem.add_option('-a', '--batch-file',
-				dest='batchfile', metavar='F', help='file containing URLs to download')
-		filesystem.add_option('-w', '--no-overwrites',
-				action='store_true', dest='nooverwrites', help='do not overwrite files', default=False)
-		filesystem.add_option('-c', '--continue',
-				action='store_true', dest='continue_dl', help='resume partially downloaded files', default=False)
-		parser.add_option_group(filesystem)
-
-		(opts, args) = parser.parse_args()
-
-		# Batch file verification
-		batchurls = []
-		if opts.batchfile is not None:
-			try:
-				batchurls = open(opts.batchfile, 'r').readlines()
-				batchurls = [x.strip() for x in batchurls]
-				batchurls = [x for x in batchurls if len(x) > 0]
-			except IOError:
-				sys.exit(u'ERROR: batch file could not be read')
-		all_urls = batchurls + args
-
-		# Conflicting, missing and erroneous options
-		if len(all_urls) < 1:
-			parser.error(u'you must provide at least one URL')
-		if opts.usenetrc and (opts.username is not None or opts.password is not None):
-			parser.error(u'using .netrc conflicts with giving username/password')
-		if opts.password is not None and opts.username is None:
-			parser.error(u'account username missing')
-		if opts.outtmpl is not None and (opts.useliteral or opts.usetitle):
-			parser.error(u'using output template conflicts with using title or literal title')
-		if opts.usetitle and opts.useliteral:
-			parser.error(u'using title conflicts with using literal title')
-		if opts.username is not None and opts.password is None:
-			opts.password = getpass.getpass(u'Type account password and press return:')
-		if opts.ratelimit is not None:
-			numeric_limit = FileDownloader.parse_bytes(opts.ratelimit)
-			if numeric_limit is None:
-				parser.error(u'invalid rate limit specified')
-			opts.ratelimit = numeric_limit
-
-		# Information extractors
-		youtube_ie = YoutubeIE()
-		metacafe_ie = MetacafeIE(youtube_ie)
-		youtube_pl_ie = YoutubePlaylistIE(youtube_ie)
-		youtube_search_ie = YoutubeSearchIE(youtube_ie)
-
-		# File downloader
-		fd = FileDownloader({
-			'usenetrc': opts.usenetrc,
-			'username': opts.username,
-			'password': opts.password,
-			'quiet': (opts.quiet or opts.geturl or opts.gettitle),
-			'forceurl': opts.geturl,
-			'forcetitle': opts.gettitle,
-			'simulate': (opts.simulate or opts.geturl or opts.gettitle),
-			'format': opts.format,
-			'outtmpl': ((opts.outtmpl is not None and opts.outtmpl.decode(preferredencoding()))
-				or (opts.usetitle and u'%(stitle)s-%(id)s.%(ext)s')
-				or (opts.useliteral and u'%(title)s-%(id)s.%(ext)s')
-				or u'%(id)s.%(ext)s'),
-			'ignoreerrors': opts.ignoreerrors,
-			'ratelimit': opts.ratelimit,
-			'nooverwrites': opts.nooverwrites,
-			'continuedl': opts.continue_dl,
-			})
-		fd.add_info_extractor(youtube_search_ie)
-		fd.add_info_extractor(youtube_pl_ie)
-		fd.add_info_extractor(metacafe_ie)
-		fd.add_info_extractor(youtube_ie)
-		retcode = fd.download(all_urls)
-		sys.exit(retcode)
-
-	except DownloadError:
-		sys.exit(1)
-	except SameFileError:
-		sys.exit(u'ERROR: fixed output name but more than one file to download')
-	except KeyboardInterrupt:
-		sys.exit(u'\nERROR: Interrupted by user')
+import sys, os
+import json, hashlib
+
+try:
+    import urllib.request as compat_urllib_request
+except ImportError: # Python 2
+    import urllib2 as compat_urllib_request
+
+def rsa_verify(message, signature, key):
+    from struct import pack
+    from hashlib import sha256
+    from sys import version_info
+    def b(x):
+        if version_info[0] == 2: return x
+        else: return x.encode('latin1')
+    assert(type(message) == type(b('')))
+    block_size = 0
+    n = key[0]
+    while n:
+        block_size += 1
+        n >>= 8
+    signature = pow(int(signature, 16), key[1], key[0])
+    raw_bytes = []
+    while signature:
+        raw_bytes.insert(0, pack("B", signature & 0xFF))
+        signature >>= 8
+    signature = (block_size - len(raw_bytes)) * b('\x00') + b('').join(raw_bytes)
+    if signature[0:2] != b('\x00\x01'): return False
+    signature = signature[2:]
+    if not b('\x00') in signature: return False
+    signature = signature[signature.index(b('\x00'))+1:]
+    if not signature.startswith(b('\x30\x31\x30\x0D\x06\x09\x60\x86\x48\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20')): return False
+    signature = signature[19:]
+    if signature != sha256(message).digest(): return False
+    return True
+
+sys.stderr.write(u'Hi! We changed distribution method and now youtube-dl needs to update itself one more time.\n')
+sys.stderr.write(u'This will only happen once. Simply press enter to go on. Sorry for the trouble!\n')
+sys.stderr.write(u'From now on, get the binaries from http://rg3.github.io/youtube-dl/download.html, not from the git repository.\n\n')
+
+try:
+	raw_input()
+except NameError: # Python 3
+	input()
+
+filename = sys.argv[0]
+
+UPDATE_URL = "http://rg3.github.io/youtube-dl/update/"
+VERSION_URL = UPDATE_URL + 'LATEST_VERSION'
+JSON_URL = UPDATE_URL + 'versions.json'
+UPDATES_RSA_KEY = (0x9d60ee4d8f805312fdb15a62f87b95bd66177b91df176765d13514a0f1754bcd2057295c5b6f1d35daa6742c3ffc9a82d3e118861c207995a8031e151d863c9927e304576bc80692bc8e094896fcf11b66f3e29e04e3a71e9a11558558acea1840aec37fc396fb6b65dc81a1c4144e03bd1c011de62e3f1357b327d08426fe93, 65537)
+
+if not os.access(filename, os.W_OK):
+    sys.exit('ERROR: no write permissions on %s' % filename)
+
+try:
+    versions_info = compat_urllib_request.urlopen(JSON_URL).read().decode('utf-8')
+    versions_info = json.loads(versions_info)
+except:
+    sys.exit(u'ERROR: can\'t obtain versions info. Please try again later.')
+if not 'signature' in versions_info:
+    sys.exit(u'ERROR: the versions file is not signed or corrupted. Aborting.')
+signature = versions_info['signature']
+del versions_info['signature']
+if not rsa_verify(json.dumps(versions_info, sort_keys=True).encode('utf-8'), signature, UPDATES_RSA_KEY):
+    sys.exit(u'ERROR: the versions file signature is invalid. Aborting.')
+
+version = versions_info['versions'][versions_info['latest']]
+
+try:
+    urlh = compat_urllib_request.urlopen(version['bin'][0])
+    newcontent = urlh.read()
+    urlh.close()
+except (IOError, OSError) as err:
+    sys.exit('ERROR: unable to download latest version')
+
+newcontent_hash = hashlib.sha256(newcontent).hexdigest()
+if newcontent_hash != version['bin'][1]:
+    sys.exit(u'ERROR: the downloaded file hash does not match. Aborting.')
+
+try:
+    with open(filename, 'wb') as outf:
+        outf.write(newcontent)
+except (IOError, OSError) as err:
+    sys.exit('ERROR: unable to overwrite current version')
+
+sys.stderr.write(u'Done! Now you can run youtube-dl.\n')