Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/utils.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 import datetime
   5 import email.utils
   6 import errno
   7 import gzip
   8 import io
   9 import json
  10 import locale
  11 import math
  12 import os
  13 import pipes
  14 import platform
  15 import re
  16 import ssl
  17 import socket
  18 import sys
  19 import traceback
  20 import xml.etree.ElementTree
  21 import zlib
  22
  23 try:
  24     import urllib.request as compat_urllib_request
  25 except ImportError: # Python 2
  26     import urllib2 as compat_urllib_request
  27
  28 try:
  29     import urllib.error as compat_urllib_error
  30 except ImportError: # Python 2
  31     import urllib2 as compat_urllib_error
  32
  33 try:
  34     import urllib.parse as compat_urllib_parse
  35 except ImportError: # Python 2
  36     import urllib as compat_urllib_parse
  37
  38 try:
  39     from urllib.parse import urlparse as compat_urllib_parse_urlparse
  40 except ImportError: # Python 2
  41     from urlparse import urlparse as compat_urllib_parse_urlparse
  42
  43 try:
  44     import urllib.parse as compat_urlparse
  45 except ImportError: # Python 2
  46     import urlparse as compat_urlparse
  47
  48 try:
  49     import http.cookiejar as compat_cookiejar
  50 except ImportError: # Python 2
  51     import cookielib as compat_cookiejar
  52
  53 try:
  54     import html.entities as compat_html_entities
  55 except ImportError: # Python 2
  56     import htmlentitydefs as compat_html_entities
  57
  58 try:
  59     import html.parser as compat_html_parser
  60 except ImportError: # Python 2
  61     import HTMLParser as compat_html_parser
  62
  63 try:
  64     import http.client as compat_http_client
  65 except ImportError: # Python 2
  66     import httplib as compat_http_client
  67
  68 try:
  69     from urllib.error import HTTPError as compat_HTTPError
  70 except ImportError:  # Python 2
  71     from urllib2 import HTTPError as compat_HTTPError
  72
  73 try:
  74     from urllib.request import urlretrieve as compat_urlretrieve
  75 except ImportError:  # Python 2
  76     from urllib import urlretrieve as compat_urlretrieve
  77
  78
  79 try:
  80     from subprocess import DEVNULL
  81     compat_subprocess_get_DEVNULL = lambda: DEVNULL
  82 except ImportError:
  83     compat_subprocess_get_DEVNULL = lambda: open(os.path.devnull, 'w')
  84
  85 try:
  86     from urllib.parse import parse_qs as compat_parse_qs
  87 except ImportError: # Python 2
  88     # HACK: The following is the correct parse_qs implementation from cpython 3's stdlib.
  89     # Python 2's version is apparently totally broken
  90     def _unquote(string, encoding='utf-8', errors='replace'):
  91         if string == '':
  92             return string
  93         res = string.split('%')
  94         if len(res) == 1:
  95             return string
  96         if encoding is None:
  97             encoding = 'utf-8'
  98         if errors is None:
  99             errors = 'replace'
 100         # pct_sequence: contiguous sequence of percent-encoded bytes, decoded
 101         pct_sequence = b''
 102         string = res[0]
 103         for item in res[1:]:
 104             try:
 105                 if not item:
 106                     raise ValueError
 107                 pct_sequence += item[:2].decode('hex')
 108                 rest = item[2:]
 109                 if not rest:
 110                     # This segment was just a single percent-encoded character.
 111                     # May be part of a sequence of code units, so delay decoding.
 112                     # (Stored in pct_sequence).
 113                     continue
 114             except ValueError:
 115                 rest = '%' + item
 116             # Encountered non-percent-encoded characters. Flush the current
 117             # pct_sequence.
 118             string += pct_sequence.decode(encoding, errors) + rest
 119             pct_sequence = b''
 120         if pct_sequence:
 121             # Flush the final pct_sequence
 122             string += pct_sequence.decode(encoding, errors)
 123         return string
 124
 125     def _parse_qsl(qs, keep_blank_values=False, strict_parsing=False,
 126                 encoding='utf-8', errors='replace'):
 127         qs, _coerce_result = qs, unicode
 128         pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
 129         r = []
 130         for name_value in pairs:
 131             if not name_value and not strict_parsing:
 132                 continue
 133             nv = name_value.split('=', 1)
 134             if len(nv) != 2:
 135                 if strict_parsing:
 136                     raise ValueError("bad query field: %r" % (name_value,))
 137                 # Handle case of a control-name with no equal sign
 138                 if keep_blank_values:
 139                     nv.append('')
 140                 else:
 141                     continue
 142             if len(nv[1]) or keep_blank_values:
 143                 name = nv[0].replace('+', ' ')
 144                 name = _unquote(name, encoding=encoding, errors=errors)
 145                 name = _coerce_result(name)
 146                 value = nv[1].replace('+', ' ')
 147                 value = _unquote(value, encoding=encoding, errors=errors)
 148                 value = _coerce_result(value)
 149                 r.append((name, value))
 150         return r
 151
 152     def compat_parse_qs(qs, keep_blank_values=False, strict_parsing=False,
 153                 encoding='utf-8', errors='replace'):
 154         parsed_result = {}
 155         pairs = _parse_qsl(qs, keep_blank_values, strict_parsing,
 156                         encoding=encoding, errors=errors)
 157         for name, value in pairs:
 158             if name in parsed_result:
 159                 parsed_result[name].append(value)
 160             else:
 161                 parsed_result[name] = [value]
 162         return parsed_result
 163
 164 try:
 165     compat_str = unicode # Python 2
 166 except NameError:
 167     compat_str = str
 168
 169 try:
 170     compat_chr = unichr # Python 2
 171 except NameError:
 172     compat_chr = chr
 173
 174 def compat_ord(c):
 175     if type(c) is int: return c
 176     else: return ord(c)
 177
 178 # This is not clearly defined otherwise
 179 compiled_regex_type = type(re.compile(''))
 180
 181 std_headers = {
 182     'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20100101 Firefox/10.0 (Chrome)',
 183     'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
 184     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
 185     'Accept-Encoding': 'gzip, deflate',
 186     'Accept-Language': 'en-us,en;q=0.5',
 187 }
 188
 189 def preferredencoding():
 190     """Get preferred encoding.
 191
 192     Returns the best encoding scheme for the system, based on
 193     locale.getpreferredencoding() and some further tweaks.
 194     """
 195     try:
 196         pref = locale.getpreferredencoding()
 197         u'TEST'.encode(pref)
 198     except:
 199         pref = 'UTF-8'
 200
 201     return pref
 202
 203 if sys.version_info < (3,0):
 204     def compat_print(s):
 205         print(s.encode(preferredencoding(), 'xmlcharrefreplace'))
 206 else:
 207     def compat_print(s):
 208         assert type(s) == type(u'')
 209         print(s)
 210
 211 # In Python 2.x, json.dump expects a bytestream.
 212 # In Python 3.x, it writes to a character stream
 213 if sys.version_info < (3,0):
 214     def write_json_file(obj, fn):
 215         with open(fn, 'wb') as f:
 216             json.dump(obj, f)
 217 else:
 218     def write_json_file(obj, fn):
 219         with open(fn, 'w', encoding='utf-8') as f:
 220             json.dump(obj, f)
 221
 222 if sys.version_info >= (2,7):
 223     def find_xpath_attr(node, xpath, key, val):
 224         """ Find the xpath xpath[@key=val] """
 225         assert re.match(r'^[a-zA-Z]+$', key)
 226         assert re.match(r'^[a-zA-Z0-9@\s]*$', val)
 227         expr = xpath + u"[@%s='%s']" % (key, val)
 228         return node.find(expr)
 229 else:
 230     def find_xpath_attr(node, xpath, key, val):
 231         for f in node.findall(xpath):
 232             if f.attrib.get(key) == val:
 233                 return f
 234         return None
 235
 236 # On python2.6 the xml.etree.ElementTree.Element methods don't support
 237 # the namespace parameter
 238 def xpath_with_ns(path, ns_map):
 239     components = [c.split(':') for c in path.split('/')]
 240     replaced = []
 241     for c in components:
 242         if len(c) == 1:
 243             replaced.append(c[0])
 244         else:
 245             ns, tag = c
 246             replaced.append('{%s}%s' % (ns_map[ns], tag))
 247     return '/'.join(replaced)
 248
 249 def htmlentity_transform(matchobj):
 250     """Transforms an HTML entity to a character.
 251
 252     This function receives a match object and is intended to be used with
 253     the re.sub() function.
 254     """
 255     entity = matchobj.group(1)
 256
 257     # Known non-numeric HTML entity
 258     if entity in compat_html_entities.name2codepoint:
 259         return compat_chr(compat_html_entities.name2codepoint[entity])
 260
 261     mobj = re.match(u'(?u)#(x?\\d+)', entity)
 262     if mobj is not None:
 263         numstr = mobj.group(1)
 264         if numstr.startswith(u'x'):
 265             base = 16
 266             numstr = u'0%s' % numstr
 267         else:
 268             base = 10
 269         return compat_chr(int(numstr, base))
 270
 271     # Unknown entity in name, return its literal representation
 272     return (u'&%s;' % entity)
 273
 274 compat_html_parser.locatestarttagend = re.compile(r"""<[a-zA-Z][-.a-zA-Z0-9:_]*(?:\s+(?:(?<=['"\s])[^\s/>][^\s/=>]*(?:\s*=+\s*(?:'[^']*'|"[^"]*"|(?!['"])[^>\s]*))?\s*)*)?\s*""", re.VERBOSE) # backport bugfix
 275 class BaseHTMLParser(compat_html_parser.HTMLParser):
 276     def __init(self):
 277         compat_html_parser.HTMLParser.__init__(self)
 278         self.html = None
 279
 280     def loads(self, html):
 281         self.html = html
 282         self.feed(html)
 283         self.close()
 284
 285 class AttrParser(BaseHTMLParser):
 286     """Modified HTMLParser that isolates a tag with the specified attribute"""
 287     def __init__(self, attribute, value):
 288         self.attribute = attribute
 289         self.value = value
 290         self.result = None
 291         self.started = False
 292         self.depth = {}
 293         self.watch_startpos = False
 294         self.error_count = 0
 295         BaseHTMLParser.__init__(self)
 296
 297     def error(self, message):
 298         if self.error_count > 10 or self.started:
 299             raise compat_html_parser.HTMLParseError(message, self.getpos())
 300         self.rawdata = '\n'.join(self.html.split('\n')[self.getpos()[0]:]) # skip one line
 301         self.error_count += 1
 302         self.goahead(1)
 303
 304     def handle_starttag(self, tag, attrs):
 305         attrs = dict(attrs)
 306         if self.started:
 307             self.find_startpos(None)
 308         if self.attribute in attrs and attrs[self.attribute] == self.value:
 309             self.result = [tag]
 310             self.started = True
 311             self.watch_startpos = True
 312         if self.started:
 313             if not tag in self.depth: self.depth[tag] = 0
 314             self.depth[tag] += 1
 315
 316     def handle_endtag(self, tag):
 317         if self.started:
 318             if tag in self.depth: self.depth[tag] -= 1
 319             if self.depth[self.result[0]] == 0:
 320                 self.started = False
 321                 self.result.append(self.getpos())
 322
 323     def find_startpos(self, x):
 324         """Needed to put the start position of the result (self.result[1])
 325         after the opening tag with the requested id"""
 326         if self.watch_startpos:
 327             self.watch_startpos = False
 328             self.result.append(self.getpos())
 329     handle_entityref = handle_charref = handle_data = handle_comment = \
 330     handle_decl = handle_pi = unknown_decl = find_startpos
 331
 332     def get_result(self):
 333         if self.result is None:
 334             return None
 335         if len(self.result) != 3:
 336             return None
 337         lines = self.html.split('\n')
 338         lines = lines[self.result[1][0]-1:self.result[2][0]]
 339         lines[0] = lines[0][self.result[1][1]:]
 340         if len(lines) == 1:
 341             lines[-1] = lines[-1][:self.result[2][1]-self.result[1][1]]
 342         lines[-1] = lines[-1][:self.result[2][1]]
 343         return '\n'.join(lines).strip()
 344 # Hack for https://github.com/rg3/youtube-dl/issues/662
 345 if sys.version_info < (2, 7, 3):
 346     AttrParser.parse_endtag = (lambda self, i:
 347         i + len("</scr'+'ipt>")
 348         if self.rawdata[i:].startswith("</scr'+'ipt>")
 349         else compat_html_parser.HTMLParser.parse_endtag(self, i))
 350
 351 def get_element_by_id(id, html):
 352     """Return the content of the tag with the specified ID in the passed HTML document"""
 353     return get_element_by_attribute("id", id, html)
 354
 355 def get_element_by_attribute(attribute, value, html):
 356     """Return the content of the tag with the specified attribute in the passed HTML document"""
 357     parser = AttrParser(attribute, value)
 358     try:
 359         parser.loads(html)
 360     except compat_html_parser.HTMLParseError:
 361         pass
 362     return parser.get_result()
 363
 364 class MetaParser(BaseHTMLParser):
 365     """
 366     Modified HTMLParser that isolates a meta tag with the specified name
 367     attribute.
 368     """
 369     def __init__(self, name):
 370         BaseHTMLParser.__init__(self)
 371         self.name = name
 372         self.content = None
 373         self.result = None
 374
 375     def handle_starttag(self, tag, attrs):
 376         if tag != 'meta':
 377             return
 378         attrs = dict(attrs)
 379         if attrs.get('name') == self.name:
 380             self.result = attrs.get('content')
 381
 382     def get_result(self):
 383         return self.result
 384
 385 def get_meta_content(name, html):
 386     """
 387     Return the content attribute from the meta tag with the given name attribute.
 388     """
 389     parser = MetaParser(name)
 390     try:
 391         parser.loads(html)
 392     except compat_html_parser.HTMLParseError:
 393         pass
 394     return parser.get_result()
 395
 396
 397 def clean_html(html):
 398     """Clean an HTML snippet into a readable string"""
 399     # Newline vs <br />
 400     html = html.replace('\n', ' ')
 401     html = re.sub(r'\s*<\s*br\s*/?\s*>\s*', '\n', html)
 402     html = re.sub(r'<\s*/\s*p\s*>\s*<\s*p[^>]*>', '\n', html)
 403     # Strip html tags
 404     html = re.sub('<.*?>', '', html)
 405     # Replace html entities
 406     html = unescapeHTML(html)
 407     return html.strip()
 408
 409
 410 def sanitize_open(filename, open_mode):
 411     """Try to open the given filename, and slightly tweak it if this fails.
 412
 413     Attempts to open the given filename. If this fails, it tries to change
 414     the filename slightly, step by step, until it's either able to open it
 415     or it fails and raises a final exception, like the standard open()
 416     function.
 417
 418     It returns the tuple (stream, definitive_file_name).
 419     """
 420     try:
 421         if filename == u'-':
 422             if sys.platform == 'win32':
 423                 import msvcrt
 424                 msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
 425             return (sys.stdout.buffer if hasattr(sys.stdout, 'buffer') else sys.stdout, filename)
 426         stream = open(encodeFilename(filename), open_mode)
 427         return (stream, filename)
 428     except (IOError, OSError) as err:
 429         if err.errno in (errno.EACCES,):
 430             raise
 431
 432         # In case of error, try to remove win32 forbidden chars
 433         alt_filename = os.path.join(
 434                         re.sub(u'[/<>:"\\|\\\\?\\*]', u'#', path_part)
 435                         for path_part in os.path.split(filename)
 436                        )
 437         if alt_filename == filename:
 438             raise
 439         else:
 440             # An exception here should be caught in the caller
 441             stream = open(encodeFilename(filename), open_mode)
 442             return (stream, alt_filename)
 443
 444
 445 def timeconvert(timestr):
 446     """Convert RFC 2822 defined time string into system timestamp"""
 447     timestamp = None
 448     timetuple = email.utils.parsedate_tz(timestr)
 449     if timetuple is not None:
 450         timestamp = email.utils.mktime_tz(timetuple)
 451     return timestamp
 452
 453 def sanitize_filename(s, restricted=False, is_id=False):
 454     """Sanitizes a string so it could be used as part of a filename.
 455     If restricted is set, use a stricter subset of allowed characters.
 456     Set is_id if this is not an arbitrary string, but an ID that should be kept if possible
 457     """
 458     def replace_insane(char):
 459         if char == '?' or ord(char) < 32 or ord(char) == 127:
 460             return ''
 461         elif char == '"':
 462             return '' if restricted else '\''
 463         elif char == ':':
 464             return '_-' if restricted else ' -'
 465         elif char in '\\/|*<>':
 466             return '_'
 467         if restricted and (char in '!&\'()[]{}$;`^,#' or char.isspace()):
 468             return '_'
 469         if restricted and ord(char) > 127:
 470             return '_'
 471         return char
 472
 473     result = u''.join(map(replace_insane, s))
 474     if not is_id:
 475         while '__' in result:
 476             result = result.replace('__', '_')
 477         result = result.strip('_')
 478         # Common case of "Foreign band name - English song title"
 479         if restricted and result.startswith('-_'):
 480             result = result[2:]
 481         if not result:
 482             result = '_'
 483     return result
 484
 485 def orderedSet(iterable):
 486     """ Remove all duplicates from the input iterable """
 487     res = []
 488     for el in iterable:
 489         if el not in res:
 490             res.append(el)
 491     return res
 492
 493 def unescapeHTML(s):
 494     """
 495     @param s a string
 496     """
 497     assert type(s) == type(u'')
 498
 499     result = re.sub(u'(?u)&(.+?);', htmlentity_transform, s)
 500     return result
 501
 502 def encodeFilename(s):
 503     """
 504     @param s The name of the file
 505     """
 506
 507     assert type(s) == type(u'')
 508
 509     # Python 3 has a Unicode API
 510     if sys.version_info >= (3, 0):
 511         return s
 512
 513     if sys.platform == 'win32' and sys.getwindowsversion()[0] >= 5:
 514         # Pass u'' directly to use Unicode APIs on Windows 2000 and up
 515         # (Detecting Windows NT 4 is tricky because 'major >= 4' would
 516         # match Windows 9x series as well. Besides, NT 4 is obsolete.)
 517         return s
 518     else:
 519         encoding = sys.getfilesystemencoding()
 520         if encoding is None:
 521             encoding = 'utf-8'
 522         return s.encode(encoding, 'ignore')
 523
 524 def decodeOption(optval):
 525     if optval is None:
 526         return optval
 527     if isinstance(optval, bytes):
 528         optval = optval.decode(preferredencoding())
 529
 530     assert isinstance(optval, compat_str)
 531     return optval
 532
 533 def formatSeconds(secs):
 534     if secs > 3600:
 535         return '%d:%02d:%02d' % (secs // 3600, (secs % 3600) // 60, secs % 60)
 536     elif secs > 60:
 537         return '%d:%02d' % (secs // 60, secs % 60)
 538     else:
 539         return '%d' % secs
 540
 541 def make_HTTPS_handler(opts_no_check_certificate):
 542     if sys.version_info < (3, 2):
 543         import httplib
 544
 545         class HTTPSConnectionV3(httplib.HTTPSConnection):
 546             def __init__(self, *args, **kwargs):
 547                 httplib.HTTPSConnection.__init__(self, *args, **kwargs)
 548
 549             def connect(self):
 550                 sock = socket.create_connection((self.host, self.port), self.timeout)
 551                 if self._tunnel_host:
 552                     self.sock = sock
 553                     self._tunnel()
 554                 try:
 555                     self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv3)
 556                 except ssl.SSLError:
 557                     self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file, ssl_version=ssl.PROTOCOL_SSLv23)
 558
 559         class HTTPSHandlerV3(compat_urllib_request.HTTPSHandler):
 560             def https_open(self, req):
 561                 return self.do_open(HTTPSConnectionV3, req)
 562         return HTTPSHandlerV3()
 563     else:
 564         context = ssl.SSLContext(ssl.PROTOCOL_SSLv3)
 565         context.set_default_verify_paths()
 566
 567         context.verify_mode = (ssl.CERT_NONE
 568                                if opts_no_check_certificate
 569                                else ssl.CERT_REQUIRED)
 570         return compat_urllib_request.HTTPSHandler(context=context)
 571
 572 class ExtractorError(Exception):
 573     """Error during info extraction."""
 574     def __init__(self, msg, tb=None, expected=False, cause=None):
 575         """ tb, if given, is the original traceback (so that it can be printed out).
 576         If expected is set, this is a normal error message and most likely not a bug in youtube-dl.
 577         """
 578
 579         if sys.exc_info()[0] in (compat_urllib_error.URLError, socket.timeout, UnavailableVideoError):
 580             expected = True
 581         if not expected:
 582             msg = msg + u'; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.'
 583         super(ExtractorError, self).__init__(msg)
 584
 585         self.traceback = tb
 586         self.exc_info = sys.exc_info()  # preserve original exception
 587         self.cause = cause
 588
 589     def format_traceback(self):
 590         if self.traceback is None:
 591             return None
 592         return u''.join(traceback.format_tb(self.traceback))
 593
 594
 595 class RegexNotFoundError(ExtractorError):
 596     """Error when a regex didn't match"""
 597     pass
 598
 599
 600 class DownloadError(Exception):
 601     """Download Error exception.
 602
 603     This exception may be thrown by FileDownloader objects if they are not
 604     configured to continue on errors. They will contain the appropriate
 605     error message.
 606     """
 607     def __init__(self, msg, exc_info=None):
 608         """ exc_info, if given, is the original exception that caused the trouble (as returned by sys.exc_info()). """
 609         super(DownloadError, self).__init__(msg)
 610         self.exc_info = exc_info
 611
 612
 613 class SameFileError(Exception):
 614     """Same File exception.
 615
 616     This exception will be thrown by FileDownloader objects if they detect
 617     multiple files would have to be downloaded to the same file on disk.
 618     """
 619     pass
 620
 621
 622 class PostProcessingError(Exception):
 623     """Post Processing exception.
 624
 625     This exception may be raised by PostProcessor's .run() method to
 626     indicate an error in the postprocessing task.
 627     """
 628     def __init__(self, msg):
 629         self.msg = msg
 630
 631 class MaxDownloadsReached(Exception):
 632     """ --max-downloads limit has been reached. """
 633     pass
 634
 635
 636 class UnavailableVideoError(Exception):
 637     """Unavailable Format exception.
 638
 639     This exception will be thrown when a video is requested
 640     in a format that is not available for that video.
 641     """
 642     pass
 643
 644
 645 class ContentTooShortError(Exception):
 646     """Content Too Short exception.
 647
 648     This exception may be raised by FileDownloader objects when a file they
 649     download is too small for what the server announced first, indicating
 650     the connection was probably interrupted.
 651     """
 652     # Both in bytes
 653     downloaded = None
 654     expected = None
 655
 656     def __init__(self, downloaded, expected):
 657         self.downloaded = downloaded
 658         self.expected = expected
 659
 660 class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
 661     """Handler for HTTP requests and responses.
 662
 663     This class, when installed with an OpenerDirector, automatically adds
 664     the standard headers to every HTTP request and handles gzipped and
 665     deflated responses from web servers. If compression is to be avoided in
 666     a particular request, the original request in the program code only has
 667     to include the HTTP header "Youtubedl-No-Compression", which will be
 668     removed before making the real request.
 669
 670     Part of this code was copied from:
 671
 672     http://techknack.net/python-urllib2-handlers/
 673
 674     Andrew Rowls, the author of that code, agreed to release it to the
 675     public domain.
 676     """
 677
 678     @staticmethod
 679     def deflate(data):
 680         try:
 681             return zlib.decompress(data, -zlib.MAX_WBITS)
 682         except zlib.error:
 683             return zlib.decompress(data)
 684
 685     @staticmethod
 686     def addinfourl_wrapper(stream, headers, url, code):
 687         if hasattr(compat_urllib_request.addinfourl, 'getcode'):
 688             return compat_urllib_request.addinfourl(stream, headers, url, code)
 689         ret = compat_urllib_request.addinfourl(stream, headers, url)
 690         ret.code = code
 691         return ret
 692
 693     def http_request(self, req):
 694         for h,v in std_headers.items():
 695             if h in req.headers:
 696                 del req.headers[h]
 697             req.add_header(h, v)
 698         if 'Youtubedl-no-compression' in req.headers:
 699             if 'Accept-encoding' in req.headers:
 700                 del req.headers['Accept-encoding']
 701             del req.headers['Youtubedl-no-compression']
 702         if 'Youtubedl-user-agent' in req.headers:
 703             if 'User-agent' in req.headers:
 704                 del req.headers['User-agent']
 705             req.headers['User-agent'] = req.headers['Youtubedl-user-agent']
 706             del req.headers['Youtubedl-user-agent']
 707         return req
 708
 709     def http_response(self, req, resp):
 710         old_resp = resp
 711         # gzip
 712         if resp.headers.get('Content-encoding', '') == 'gzip':
 713             content = resp.read()
 714             gz = gzip.GzipFile(fileobj=io.BytesIO(content), mode='rb')
 715             try:
 716                 uncompressed = io.BytesIO(gz.read())
 717             except IOError as original_ioerror:
 718                 # There may be junk add the end of the file
 719                 # See http://stackoverflow.com/q/4928560/35070 for details
 720                 for i in range(1, 1024):
 721                     try:
 722                         gz = gzip.GzipFile(fileobj=io.BytesIO(content[:-i]), mode='rb')
 723                         uncompressed = io.BytesIO(gz.read())
 724                     except IOError:
 725                         continue
 726                     break
 727                 else:
 728                     raise original_ioerror
 729             resp = self.addinfourl_wrapper(uncompressed, old_resp.headers, old_resp.url, old_resp.code)
 730             resp.msg = old_resp.msg
 731         # deflate
 732         if resp.headers.get('Content-encoding', '') == 'deflate':
 733             gz = io.BytesIO(self.deflate(resp.read()))
 734             resp = self.addinfourl_wrapper(gz, old_resp.headers, old_resp.url, old_resp.code)
 735             resp.msg = old_resp.msg
 736         return resp
 737
 738     https_request = http_request
 739     https_response = http_response
 740
 741 def unified_strdate(date_str):
 742     """Return a string with the date in the format YYYYMMDD"""
 743     upload_date = None
 744     #Replace commas
 745     date_str = date_str.replace(',',' ')
 746     # %z (UTC offset) is only supported in python>=3.2
 747     date_str = re.sub(r' (\+|-)[\d]*$', '', date_str)
 748     format_expressions = [
 749         '%d %B %Y',
 750         '%B %d %Y',
 751         '%b %d %Y',
 752         '%Y-%m-%d',
 753         '%d/%m/%Y',
 754         '%Y/%m/%d %H:%M:%S',
 755         '%d.%m.%Y %H:%M',
 756         '%Y-%m-%dT%H:%M:%SZ',
 757         '%Y-%m-%dT%H:%M:%S.%fZ',
 758         '%Y-%m-%dT%H:%M:%S.%f0Z',
 759         '%Y-%m-%dT%H:%M:%S',
 760     ]
 761     for expression in format_expressions:
 762         try:
 763             upload_date = datetime.datetime.strptime(date_str, expression).strftime('%Y%m%d')
 764         except:
 765             pass
 766     return upload_date
 767
 768 def determine_ext(url, default_ext=u'unknown_video'):
 769     guess = url.partition(u'?')[0].rpartition(u'.')[2]
 770     if re.match(r'^[A-Za-z0-9]+$', guess):
 771         return guess
 772     else:
 773         return default_ext
 774
 775 def subtitles_filename(filename, sub_lang, sub_format):
 776     return filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.' + sub_format
 777
 778 def date_from_str(date_str):
 779     """
 780     Return a datetime object from a string in the format YYYYMMDD or
 781     (now|today)[+-][0-9](day|week|month|year)(s)?"""
 782     today = datetime.date.today()
 783     if date_str == 'now'or date_str == 'today':
 784         return today
 785     match = re.match('(now|today)(?P<sign>[+-])(?P<time>\d+)(?P<unit>day|week|month|year)(s)?', date_str)
 786     if match is not None:
 787         sign = match.group('sign')
 788         time = int(match.group('time'))
 789         if sign == '-':
 790             time = -time
 791         unit = match.group('unit')
 792         #A bad aproximation?
 793         if unit == 'month':
 794             unit = 'day'
 795             time *= 30
 796         elif unit == 'year':
 797             unit = 'day'
 798             time *= 365
 799         unit += 's'
 800         delta = datetime.timedelta(**{unit: time})
 801         return today + delta
 802     return datetime.datetime.strptime(date_str, "%Y%m%d").date()
 803
 804 class DateRange(object):
 805     """Represents a time interval between two dates"""
 806     def __init__(self, start=None, end=None):
 807         """start and end must be strings in the format accepted by date"""
 808         if start is not None:
 809             self.start = date_from_str(start)
 810         else:
 811             self.start = datetime.datetime.min.date()
 812         if end is not None:
 813             self.end = date_from_str(end)
 814         else:
 815             self.end = datetime.datetime.max.date()
 816         if self.start > self.end:
 817             raise ValueError('Date range: "%s" , the start date must be before the end date' % self)
 818     @classmethod
 819     def day(cls, day):
 820         """Returns a range that only contains the given day"""
 821         return cls(day,day)
 822     def __contains__(self, date):
 823         """Check if the date is in the range"""
 824         if not isinstance(date, datetime.date):
 825             date = date_from_str(date)
 826         return self.start <= date <= self.end
 827     def __str__(self):
 828         return '%s - %s' % ( self.start.isoformat(), self.end.isoformat())
 829
 830
 831 def platform_name():
 832     """ Returns the platform name as a compat_str """
 833     res = platform.platform()
 834     if isinstance(res, bytes):
 835         res = res.decode(preferredencoding())
 836
 837     assert isinstance(res, compat_str)
 838     return res
 839
 840
 841 def write_string(s, out=None):
 842     if out is None:
 843         out = sys.stderr
 844     assert type(s) == type(u'')
 845
 846     if ('b' in getattr(out, 'mode', '') or
 847             sys.version_info[0] < 3):  # Python 2 lies about mode of sys.stderr
 848         s = s.encode(preferredencoding(), 'ignore')
 849     out.write(s)
 850     out.flush()
 851
 852
 853 def bytes_to_intlist(bs):
 854     if not bs:
 855         return []
 856     if isinstance(bs[0], int):  # Python 3
 857         return list(bs)
 858     else:
 859         return [ord(c) for c in bs]
 860
 861
 862 def intlist_to_bytes(xs):
 863     if not xs:
 864         return b''
 865     if isinstance(chr(0), bytes):  # Python 2
 866         return ''.join([chr(x) for x in xs])
 867     else:
 868         return bytes(xs)
 869
 870
 871 def get_cachedir(params={}):
 872     cache_root = os.environ.get('XDG_CACHE_HOME',
 873                                 os.path.expanduser('~/.cache'))
 874     return params.get('cachedir', os.path.join(cache_root, 'youtube-dl'))
 875
 876
 877 # Cross-platform file locking
 878 if sys.platform == 'win32':
 879     import ctypes.wintypes
 880     import msvcrt
 881
 882     class OVERLAPPED(ctypes.Structure):
 883         _fields_ = [
 884             ('Internal', ctypes.wintypes.LPVOID),
 885             ('InternalHigh', ctypes.wintypes.LPVOID),
 886             ('Offset', ctypes.wintypes.DWORD),
 887             ('OffsetHigh', ctypes.wintypes.DWORD),
 888             ('hEvent', ctypes.wintypes.HANDLE),
 889         ]
 890
 891     kernel32 = ctypes.windll.kernel32
 892     LockFileEx = kernel32.LockFileEx
 893     LockFileEx.argtypes = [
 894         ctypes.wintypes.HANDLE,     # hFile
 895         ctypes.wintypes.DWORD,      # dwFlags
 896         ctypes.wintypes.DWORD,      # dwReserved
 897         ctypes.wintypes.DWORD,      # nNumberOfBytesToLockLow
 898         ctypes.wintypes.DWORD,      # nNumberOfBytesToLockHigh
 899         ctypes.POINTER(OVERLAPPED)  # Overlapped
 900     ]
 901     LockFileEx.restype = ctypes.wintypes.BOOL
 902     UnlockFileEx = kernel32.UnlockFileEx
 903     UnlockFileEx.argtypes = [
 904         ctypes.wintypes.HANDLE,     # hFile
 905         ctypes.wintypes.DWORD,      # dwReserved
 906         ctypes.wintypes.DWORD,      # nNumberOfBytesToLockLow
 907         ctypes.wintypes.DWORD,      # nNumberOfBytesToLockHigh
 908         ctypes.POINTER(OVERLAPPED)  # Overlapped
 909     ]
 910     UnlockFileEx.restype = ctypes.wintypes.BOOL
 911     whole_low = 0xffffffff
 912     whole_high = 0x7fffffff
 913
 914     def _lock_file(f, exclusive):
 915         overlapped = OVERLAPPED()
 916         overlapped.Offset = 0
 917         overlapped.OffsetHigh = 0
 918         overlapped.hEvent = 0
 919         f._lock_file_overlapped_p = ctypes.pointer(overlapped)
 920         handle = msvcrt.get_osfhandle(f.fileno())
 921         if not LockFileEx(handle, 0x2 if exclusive else 0x0, 0,
 922                           whole_low, whole_high, f._lock_file_overlapped_p):
 923             raise OSError('Locking file failed: %r' % ctypes.FormatError())
 924
 925     def _unlock_file(f):
 926         assert f._lock_file_overlapped_p
 927         handle = msvcrt.get_osfhandle(f.fileno())
 928         if not UnlockFileEx(handle, 0,
 929                             whole_low, whole_high, f._lock_file_overlapped_p):
 930             raise OSError('Unlocking file failed: %r' % ctypes.FormatError())
 931
 932 else:
 933     import fcntl
 934
 935     def _lock_file(f, exclusive):
 936         fcntl.lockf(f, fcntl.LOCK_EX if exclusive else fcntl.LOCK_SH)
 937
 938     def _unlock_file(f):
 939         fcntl.lockf(f, fcntl.LOCK_UN)
 940
 941
 942 class locked_file(object):
 943     def __init__(self, filename, mode, encoding=None):
 944         assert mode in ['r', 'a', 'w']
 945         self.f = io.open(filename, mode, encoding=encoding)
 946         self.mode = mode
 947
 948     def __enter__(self):
 949         exclusive = self.mode != 'r'
 950         try:
 951             _lock_file(self.f, exclusive)
 952         except IOError:
 953             self.f.close()
 954             raise
 955         return self
 956
 957     def __exit__(self, etype, value, traceback):
 958         try:
 959             _unlock_file(self.f)
 960         finally:
 961             self.f.close()
 962
 963     def __iter__(self):
 964         return iter(self.f)
 965
 966     def write(self, *args):
 967         return self.f.write(*args)
 968
 969     def read(self, *args):
 970         return self.f.read(*args)
 971
 972
 973 def shell_quote(args):
 974     quoted_args = []
 975     encoding = sys.getfilesystemencoding()
 976     if encoding is None:
 977         encoding = 'utf-8'
 978     for a in args:
 979         if isinstance(a, bytes):
 980             # We may get a filename encoded with 'encodeFilename'
 981             a = a.decode(encoding)
 982         quoted_args.append(pipes.quote(a))
 983     return u' '.join(quoted_args)
 984
 985
 986 def takewhile_inclusive(pred, seq):
 987     """ Like itertools.takewhile, but include the latest evaluated element
 988         (the first element so that Not pred(e)) """
 989     for e in seq:
 990         yield e
 991         if not pred(e):
 992             return
 993
 994
 995 def smuggle_url(url, data):
 996     """ Pass additional data in a URL for internal use. """
 997
 998     sdata = compat_urllib_parse.urlencode(
 999         {u'__youtubedl_smuggle': json.dumps(data)})
1000     return url + u'#' + sdata
1001
1002
1003 def unsmuggle_url(smug_url):
1004     if not '#__youtubedl_smuggle' in smug_url:
1005         return smug_url, None
1006     url, _, sdata = smug_url.rpartition(u'#')
1007     jsond = compat_parse_qs(sdata)[u'__youtubedl_smuggle'][0]
1008     data = json.loads(jsond)
1009     return url, data
1010
1011
1012 def format_bytes(bytes):
1013     if bytes is None:
1014         return u'N/A'
1015     if type(bytes) is str:
1016         bytes = float(bytes)
1017     if bytes == 0.0:
1018         exponent = 0
1019     else:
1020         exponent = int(math.log(bytes, 1024.0))
1021     suffix = [u'B', u'KiB', u'MiB', u'GiB', u'TiB', u'PiB', u'EiB', u'ZiB', u'YiB'][exponent]
1022     converted = float(bytes) / float(1024 ** exponent)
1023     return u'%.2f%s' % (converted, suffix)