[mixcloud] Fix extraction (closes #14088)

youtube_dl/compat.py

@@ -6,6 +6,7 @@ import collections
 import email
 import getpass
 import io
+import itertools
 import optparse
 import os
 import re
@@ -15,7 +16,6 @@ import socket
 import struct
 import subprocess
 import sys
-import itertools
 import xml.etree.ElementTree
 
 
@@ -2898,6 +2898,13 @@ else:
     compat_struct_pack = struct.pack
     compat_struct_unpack = struct.unpack
 
+try:
+    from future_builtins import zip as compat_zip
+except ImportError:  # not 2.6+ or is 3.x
+    try:
+        from itertools import izip as compat_zip  # < 2.5 or 3.x
+    except ImportError:
+        compat_zip = zip
 
 __all__ = [
     'compat_HTMLParseError',
@@ -2948,5 +2955,6 @@ __all__ = [
     'compat_urlretrieve',
     'compat_xml_parse_error',
     'compat_xpath',
+    'compat_zip',
     'workaround_optparse_bug9161',
 ]

youtube_dl/extractor/mixcloud.py

@@ -9,16 +9,16 @@ from .common import InfoExtractor
 from ..compat import (
     compat_chr,
     compat_ord,
-    compat_str,
     compat_urllib_parse_unquote,
     compat_urlparse,
+    compat_zip
 )
 from ..utils import (
     clean_html,
     ExtractorError,
     OnDemandPagedList,
     str_to_int,
-)
+    try_get)
 
 
 class MixcloudIE(InfoExtractor):
@@ -54,27 +54,19 @@ class MixcloudIE(InfoExtractor):
         'only_matching': True,
     }]
 
-    _keys = [
+    @staticmethod
-        'return { requestAnimationFrame: function(callback) { callback(); }, innerHeight: 500 };',
+    def _decrypt_xor_cipher(key, ciphertext):
-        'pleasedontdownloadourmusictheartistswontgetpaid',
+        """Encrypt/Decrypt XOR cipher. Both ways are possible because it's XOR."""
-        'window.addEventListener = window.addEventListener || function() {};',
+        return ''.join([
-        '(function() { return new Date().toLocaleDateString(); })()'
+            compat_chr(compat_ord(ch) ^ compat_ord(k))
-    ]
+            for ch, k in compat_zip(ciphertext, itertools.cycle(key))])
-    _current_key = None
 
-    # See https://www.mixcloud.com/media/js2/www_js_2.9e23256562c080482435196ca3975ab5.js
+    @staticmethod
-    def _decrypt_play_info(self, play_info, video_id):
+    def _decrypt_and_extend(stream_info, url_key, getter, key, formats):
-        play_info = base64.b64decode(play_info.encode('ascii'))
+        maybe_url = stream_info.get(url_key)
-        for num, key in enumerate(self._keys, start=1):
+        if maybe_url is not None:
-            try:
+            decrypted = MixcloudIE._decrypt_xor_cipher(key, base64.b64decode(maybe_url))
-                return self._parse_json(
+            formats.extend(getter(decrypted))
-                    ''.join([
-                        compat_chr(compat_ord(ch) ^ compat_ord(key[idx % len(key)]))
-                        for idx, ch in enumerate(play_info)]),
-                    video_id)
-            except ExtractorError:
-                if num == len(self._keys):
-                    raise
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
@@ -84,35 +76,66 @@ class MixcloudIE(InfoExtractor):
 
         webpage = self._download_webpage(url, track_id)
 
-        if not self._current_key:
+        # Legacy path
-            js_url = self._search_regex(
+        encrypted_play_info = self._search_regex(
-                r'<script[^>]+\bsrc=["\"](https://(?:www\.)?mixcloud\.com/media/js2/www_js_4\.[^>]+\.js)',
+            r'm-play-info="([^"]+)"', webpage, 'play info', default=None)
-                webpage, 'js url', default=None)
+
-            if js_url:
+        if encrypted_play_info is not None:
-                js = self._download_webpage(js_url, track_id, fatal=False)
+            # Decode
-                if js:
+            encrypted_play_info = base64.b64decode(encrypted_play_info)
-                    KEY_RE_TEMPLATE = r'player\s*:\s*{.*?\b%s\s*:\s*(["\'])(?P<key>(?:(?!\1).)+)\1'
+        else:
-                    for key_name in ('value', 'key_value', 'key_value.*?', '.*?value.*?'):
+            # New path
-                        key = self._search_regex(
+            full_info_json = self._parse_json(self._html_search_regex(
-                            KEY_RE_TEMPLATE % key_name, js, 'key',
+                r'<script id="relay-data" type="text/x-mixcloud">([^<]+)</script>', webpage, 'play info'), 'play info')
-                            default=None, group='key')
+            for item in full_info_json:
-                        if key and isinstance(key, compat_str):
+                item_data = try_get(item, lambda x: x['cloudcast']['data']['cloudcastLookup'])
-                            self._keys.insert(0, key)
+                if try_get(item_data, lambda x: x['streamInfo']['url']):
-                            self._current_key = key
+                    info_json = item_data
+                    break
+            else:
+                raise ExtractorError('Failed to extract matching stream info')
 
         message = self._html_search_regex(
             r'(?s)<div[^>]+class="global-message cloudcast-disabled-notice-light"[^>]*>(.+?)<(?:a|/div)',
             webpage, 'error message', default=None)
 
-        encrypted_play_info = self._search_regex(
+        js_url = self._search_regex(
-            r'm-play-info="([^"]+)"', webpage, 'play info')
+            r'<script[^>]+\bsrc=["\"](https://(?:www\.)?mixcloud\.com/media/js2/www_js_4\.[^>]+\.js)',
-
+            webpage, 'js url', default=None)
-        play_info = self._decrypt_play_info(encrypted_play_info, track_id)
+        if js_url is None:
+            js_url = self._search_regex(
+                r'<script[^>]+\bsrc=["\"](https://(?:www\.)?mixcloud\.com/media/js/www\.[^>]+\.js)',
+                webpage, 'js url')
+        js = self._download_webpage(js_url, track_id)
+        # Known plaintext attack
+        if encrypted_play_info:
+            kps = ['{"stream_url":']
+            kpa_target = encrypted_play_info
+        else:
+            kps = ['https://', 'http://']
+            kpa_target = base64.b64decode(info_json['streamInfo']['url'])
+        for kp in kps:
+            partial_key = self._decrypt_xor_cipher(kpa_target, kp)
+            for quote in ["'", '"']:
+                key = self._search_regex(r'{0}({1}[^{0}]*){0}'.format(quote, re.escape(partial_key)), js,
+                                         "encryption key", default=None)
+                if key is not None:
+                    break
+            else:
+                continue
+            break
+        else:
+            raise ExtractorError('Failed to extract encryption key')
 
+        if encrypted_play_info is not None:
+            play_info = self._parse_json(self._decrypt_xor_cipher(key, encrypted_play_info), 'play info')
             if message and 'stream_url' not in play_info:
                 raise ExtractorError('%s said: %s' % (self.IE_NAME, message), expected=True)
-
             song_url = play_info['stream_url']
+            formats = [{
+                'format_id': 'normal',
+                'url': song_url
+            }]
 
             title = self._html_search_regex(r'm-title="([^"]+)"', webpage, 'title')
             thumbnail = self._proto_relative_url(self._html_search_regex(
@@ -128,10 +151,30 @@ class MixcloudIE(InfoExtractor):
                  r'(?:m|data)-tooltip=["\']([\d,.]+) plays'],
                 webpage, 'play count', default=None))
 
+        else:
+            title = info_json['name']
+            thumbnail = try_get(info_json,
+                                lambda x: 'https://thumbnailer.mixcloud.com/unsafe/600x600/' + x['picture']['urlRoot'])
+            uploader = try_get(info_json, lambda x: x['owner']['displayName'])
+            uploader_id = try_get(info_json, lambda x: x['owner']['username'])
+            description = try_get(info_json, lambda x: x['description'])
+            view_count = try_get(info_json, lambda x: x['plays'])
+
+            stream_info = info_json['streamInfo']
+            formats = []
+            self._decrypt_and_extend(stream_info, 'url', lambda x: [{
+                'format_id': 'normal',
+                'url': x
+            }], key, formats)
+            self._decrypt_and_extend(stream_info, 'hlsUrl', lambda x: self._extract_m3u8_formats(x, title), key,
+                                     formats)
+            self._decrypt_and_extend(stream_info, 'dashUrl', lambda x: self._extract_mpd_formats(x, title), key,
+                                     formats)
+
         return {
             'id': track_id,
             'title': title,
-            'url': song_url,
+            'formats': formats,
             'description': description,
             'thumbnail': thumbnail,
             'uploader': uploader,