1 files changed, 344 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
new file mode 100644
index 000000000..a19656000
--- /dev/null
+++ b/youtube_dl/utils.py
@@ -0,0 +1,344 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import gzip
+import htmlentitydefs
+import HTMLParser
+import locale
+import os
+import re
+import sys
+import zlib
+import urllib2
+import email.utils
+
+try:
+	import cStringIO as StringIO
+except ImportError:
+	import StringIO
+		
+try:
+	import json
+except ImportError: # Python <2.6, use trivialjson (https://github.com/phihag/trivialjson):
+	import trivialjson as json
+
+std_headers = {
+	'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1',
+	'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
+	'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
+	'Accept-Encoding': 'gzip, deflate',
+	'Accept-Language': 'en-us,en;q=0.5',
+}
+
+def preferredencoding():
+	"""Get preferred encoding.
+
+	Returns the best encoding scheme for the system, based on
+	locale.getpreferredencoding() and some further tweaks.
+	"""
+	def yield_preferredencoding():
+		try:
+			pref = locale.getpreferredencoding()
+			u'TEST'.encode(pref)
+		except:
+			pref = 'UTF-8'
+		while True:
+			yield pref
+	return yield_preferredencoding().next()
+
+
+def htmlentity_transform(matchobj):
+	"""Transforms an HTML entity to a Unicode character.
+
+	This function receives a match object and is intended to be used with
+	the re.sub() function.
+	"""
+	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)
+
+
+class IDParser(HTMLParser.HTMLParser):
+	"""Modified HTMLParser that isolates a tag with the specified id"""
+	def __init__(self, id):
+		self.id = id
+		self.result = None
+		self.started = False
+		self.depth = {}
+		self.html = None
+		self.watch_startpos = False
+		HTMLParser.HTMLParser.__init__(self)
+
+	def loads(self, html):
+		self.html = html
+		self.feed(html)
+		self.close()
+
+	def handle_starttag(self, tag, attrs):
+		attrs = dict(attrs)
+		if self.started:
+			self.find_startpos(None)
+		if 'id' in attrs and attrs['id'] == self.id:
+			self.result = [tag]
+			self.started = True
+			self.watch_startpos = True
+		if self.started:
+			if not tag in self.depth: self.depth[tag] = 0
+			self.depth[tag] += 1
+
+	def handle_endtag(self, tag):
+		if self.started:
+			if tag in self.depth: self.depth[tag] -= 1
+			if self.depth[self.result[0]] == 0:
+				self.started = False
+				self.result.append(self.getpos())
+
+	def find_startpos(self, x):
+		"""Needed to put the start position of the result (self.result[1])
+		after the opening tag with the requested id"""
+		if self.watch_startpos:
+			self.watch_startpos = False
+			self.result.append(self.getpos())
+	handle_entityref = handle_charref = handle_data = handle_comment = \
+	handle_decl = handle_pi = unknown_decl = find_startpos
+
+	def get_result(self):
+		if self.result == None: return None
+		if len(self.result) != 3: return None
+		lines = self.html.split('\n')
+		lines = lines[self.result[1][0]-1:self.result[2][0]]
+		lines[0] = lines[0][self.result[1][1]:]
+		if len(lines) == 1:
+			lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
+		lines[-1] = lines[-1][:self.result[2][1]]
+		return '\n'.join(lines).strip()
+
+def get_element_by_id(id, html):
+	"""Return the content of the tag with the specified id in the passed HTML document"""
+	parser = IDParser(id)
+	try:
+		parser.loads(html)
+	except HTMLParser.HTMLParseError:
+		pass
+	return parser.get_result()
+
+
+def clean_html(html):
+	"""Clean an HTML snippet into a readable string"""
+	# Newline vs <br />
+	html = html.replace('\n', ' ')
+	html = re.sub('\s*<\s*br\s*/?\s*>\s*', '\n', html)
+	# Strip html tags
+	html = re.sub('<.*?>', '', html)
+	# Replace html entities
+	html = unescapeHTML(html)
+	return html
+
+
+def sanitize_title(utitle):
+	"""Sanitizes a video title so it could be used as part of a filename."""
+	utitle = unescapeHTML(utitle)
+	return utitle.replace(unicode(os.sep), u'%')
+
+
+def sanitize_open(filename, open_mode):
+	"""Try to open the given filename, and slightly tweak it if this fails.
+
+	Attempts to open the given filename. If this fails, it tries to change
+	the filename slightly, step by step, until it's either able to open it
+	or it fails and raises a final exception, like the standard open()
+	function.
+
+	It returns the tuple (stream, definitive_file_name).
+	"""
+	try:
+		if filename == u'-':
+			if sys.platform == 'win32':
+				import msvcrt
+				msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
+			return (sys.stdout, filename)
+		stream = open(encodeFilename(filename), open_mode)
+		return (stream, filename)
+	except (IOError, OSError), err:
+		# In case of error, try to remove win32 forbidden chars
+		filename = re.sub(ur'[/<>:"\|\?\*]', u'#', filename)
+
+		# An exception here should be caught in the caller
+		stream = open(encodeFilename(filename), open_mode)
+		return (stream, filename)
+
+
+def timeconvert(timestr):
+	"""Convert RFC 2822 defined time string into system timestamp"""
+	timestamp = None
+	timetuple = email.utils.parsedate_tz(timestr)
+	if timetuple is not None:
+		timestamp = email.utils.mktime_tz(timetuple)
+	return timestamp
+
+def simplify_title(title):
+	expr = re.compile(ur'[^\w\d_\-]+', flags=re.UNICODE)
+	return expr.sub(u'_', title).strip(u'_')
+
+def orderedSet(iterable):
+	""" Remove all duplicates from the input iterable """
+	res = []
+	for el in iterable:
+		if el not in res:
+			res.append(el)
+	return res
+
+def unescapeHTML(s):
+	"""
+	@param s a string (of type unicode)
+	"""
+	assert type(s) == type(u'')
+
+	result = re.sub(ur'(?u)&(.+?);', htmlentity_transform, s)
+	return result
+
+def encodeFilename(s):
+	"""
+	@param s The name of the file (of type unicode)
+	"""
+
+	assert type(s) == type(u'')
+
+	if sys.platform == 'win32' and sys.getwindowsversion().major >= 5:
+		# Pass u'' directly to use Unicode APIs on Windows 2000 and up
+		# (Detecting Windows NT 4 is tricky because 'major >= 4' would
+		# match Windows 9x series as well. Besides, NT 4 is obsolete.)
+		return s
+	else:
+		return s.encode(sys.getfilesystemencoding(), 'ignore')
+
+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 MaxDownloadsReached(Exception):
+	""" --max-downloads limit has been reached. """
+	pass
+
+
+class UnavailableVideoError(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 YoutubeDLHandler(urllib2.HTTPHandler):
+	"""Handler for HTTP requests and responses.
+
+	This class, when installed with an OpenerDirector, automatically adds
+	the standard headers to every HTTP request and handles gzipped and
+	deflated responses from web servers. If compression is to be avoided in
+	a particular request, the original request in the program code only has
+	to include the HTTP header "Youtubedl-No-Compression", which will be
+	removed before making the real request.
+
+	Part of this code was copied from:
+
+	http://techknack.net/python-urllib2-handlers/
+
+	Andrew Rowls, the author of that code, agreed to release it to the
+	public domain.
+	"""
+
+	@staticmethod
+	def deflate(data):
+		try:
+			return zlib.decompress(data, -zlib.MAX_WBITS)
+		except zlib.error:
+			return zlib.decompress(data)
+
+	@staticmethod
+	def addinfourl_wrapper(stream, headers, url, code):
+		if hasattr(urllib2.addinfourl, 'getcode'):
+			return urllib2.addinfourl(stream, headers, url, code)
+		ret = urllib2.addinfourl(stream, headers, url)
+		ret.code = code
+		return ret
+
+	def http_request(self, req):
+		for h in std_headers:
+			if h in req.headers:
+				del req.headers[h]
+			req.add_header(h, std_headers[h])
+		if 'Youtubedl-no-compression' in req.headers:
+			if 'Accept-encoding' in req.headers:
+				del req.headers['Accept-encoding']
+			del req.headers['Youtubedl-no-compression']
+		return req
+
+	def http_response(self, req, resp):
+		old_resp = resp
+		# gzip
+		if resp.headers.get('Content-encoding', '') == 'gzip':
+			gz = gzip.GzipFile(fileobj=StringIO.StringIO(resp.read()), mode='r')
+			resp = self.addinfourl_wrapper(gz, old_resp.headers, old_resp.url, old_resp.code)
+			resp.msg = old_resp.msg
+		# deflate
+		if resp.headers.get('Content-encoding', '') == 'deflate':
+			gz = StringIO.StringIO(self.deflate(resp.read()))
+			resp = self.addinfourl_wrapper(gz, old_resp.headers, old_resp.url, old_resp.code)
+			resp.msg = old_resp.msg
+		return resp