This file is indexed.

/usr/share/perl5/FlashVideo/Site/Youku.pm is in get-flash-videos 1.25~git2014.03.23-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
package FlashVideo::Site::Youku;

use strict;
use FlashVideo::JSON;
use FlashVideo::Utils;

# This was way too much work; breaking the encryption was a pain in the ass
sub find_video {
  my ($self, $browser, $embed_url) = @_;

  my $check_response = sub {
    my ( $message ) = @_;
    return if $browser->success;
    die sprintf $message, $browser->response->code;
  };

  # Watch: http://v.youku.com/v_show/id_XOTA4ODg2NTI=.html
  # Embed: http://player.youku.com/player.php/sid/XOTA4ODg2NTI=/v.swf
  # which redirects to:
  #        http://static.youku.com/v1.0.0036/v/swf/qplayer.swf?VideoIDS=XOTA4ODg2NTI=&embedid=-&showAd=0

  if ( $embed_url !~ m`^http://v.youku.com/v_show/` )
  {
    # Not quite the URL we expect, maybe it's the embedded one?
    die "Don't recognise the youku link"
      unless $embed_url =~ m`player.php/sid/(.+)/v\.swf`
      or $embed_url =~ m`qplayer\.swf\?VideoIDS=([^&]+)`
      or $browser->content =~ m`player.php/sid/([^/]+)/v\.swf`;

    $embed_url = sprintf "http://v.youku.com/v_show/id_%s.html", $1;
    $browser->get( $embed_url );
  }
  $check_response->( "Can't load the youku page, server response was %s" );

  # There is a JS variable we need to scan for to get the internal video ID
  my ( $videoID ) = ( $browser->content =~ /var videoId = '(.+?)';/ );
  die "Couldn't extract video ID from youku page, we are probably out of date"
    unless $videoID;
  debug "Using video ID $videoID";

  # Need to get information about the video
  $browser->get(
    sprintf "http://v.youku.com/player/getPlayList/VideoIDS/%s/version/5/source/video/password/?ran=%d&n=%d",
    $videoID, rand( 10000 ), 3 );
  $check_response->( "Couldn't grab video informaton from youku, server response was %s" );

  return parse_video_info( $browser );
}

# Convenience function for getting and checking parsed JSON data
# 'json' is a hashref as returned by from_json() (or a subhash)
# 'key' is the string key to get
# 'type' is an optional type string to check the data against,
#        as returned by the perl ref() function
sub extract {
  my ($json, $key, $type) = @_;
  die "Can't find '$key' key in the JSON data"
    unless exists $json->{$key};
  my $data = $json->{$key};
  if (defined $type) {
    my $dtype = ref $data || 'DATA';
    die "JSON data under '$key' is not the right type"
      . " (expecting $type, but got $dtype)"
      unless $dtype eq $type;
  }
  return $data;
}

sub parse_video_info {
  my ($browser) = @_;

  # Response is a JSON data structure
  my $jsonstr = $browser->content;
  debug "Video data: $jsonstr";

  # The JSON video info hash has everything we need
=begin
JSON structure:
{
    "data": [
    {
        "tt": "0",
        "ct": "f",
        "cs": "2128",
        "logo": "http:\/\/vimg8.yoqoo.com\/1100641F464A093EE7A01B012D4F1E594631EE-7D79-6FCE-936E-FDB651BA15F1",
        "seed": 1291,
        "tags": [ "\u97f3\u4e50", "\u56db\u5ddd", "\u5730\u9707", "\u7eaa\u5ff5", "\u8001\u5916", "\u5468\u5e74", "\u707e\u533a", "MV", "music", "Video" ],
        "categories": "95",
        "streamsizes": { "flv": "4840977" },
        "streamfileids": { "flv": "16*18*16*16*43*4*16*25*16*16*4*27*16*39*41*5*5*59*27*4*59*41*16*25*18*63*4*64*25*5*4*27*41*63*25*41*5*6*24*39*16*19*54*24*4*63*25*27*24*16*41*41*33*24*64*25*5*6*43*16*6*41*27*41*25*18*"},
        "videoid": "22722163",
        "segs":
        {
            "flv": [
            {
                "no": "0",
                "size": "4840977",
                "seconds": "145"
            } ]
        },
        "fileid": "16*18*16*16*43*4*16*25*16*16*4*27*16*39*41*5*5*59*27*4*59*41*16*25*18*63*4*64*25*5*4*27*41*63*25*41*5*6*24*39*16*19*54*24*4*63*25*27*24*16*41*41*33*24*64*25*5*6*43*16*6*41*27*41*25*18*",
        "username": "YBuzz",
        "userid": "19746590",
        "title": "MV: \u6765\u81ea\u56db\u5ddd\u7684\u6b4c\u58f0",
        "key1": "a4156bcd",
        "key2": "df891d4af342844b",
        "seconds": "145.40",
        "streamtypes": [ "flv" ]
    } ],
    "user": { "id": 0 },
    "controller": { "search_count": true }
}
=cut
  my $json = from_json($jsonstr);

  my $data_array = extract($json, data => 'ARRAY');
  die "No elements found in 'data' array" unless @$data_array;
  my $data = $data_array->[0];

  my $segmap = extract($data, segs => 'HASH');

  # Stream types, in order of preference
  # XXX: How is 'flvhd' used?
  my @streamtype_preferences = qw(mp4 flv);
  my @streamtypes = keys %$segmap;

  # If none of the preferred types are found, just take
  # the first one and hope for the best
  my $stream = $streamtypes[0];

  for my $pref (@streamtype_preferences) {
    if (grep { $_ eq $pref } @streamtypes) {
      $stream = $pref;
      last;
    }
  }

  my $streams = join ' ', @streamtypes;
  debug "Choosing to use the $stream stream (available: $streams)";

  # Use the file ID associated with the stream we chose (when available)
  my $fileID;
  if (exists $data->{streamfileids}) {
    my $streamfileids = extract($data, streamfileids => 'HASH');

    $fileID = extract($streamfileids, $stream)
      if exists $streamfileids->{$stream};
  }

  # Fallback to the 'fileid' field if we did not find the ID for the stream
  $fileID = extract($data, 'fileid')
    if not $fileID and exists $data->{fileid};

  die "Can't find the encrypted file ID in the video info JSON"
    unless $fileID;
  debug "Encrypted file ID: $fileID";

  my $shuffle_seed = extract($data, 'seed');

  # File ID is given in obfuscated form, each entry is an index in a lookup
  # table that is generated from the seed value
  my @lookup_table = shuffle_table( $shuffle_seed );
  $fileID =~ s/(\d+)\*/$lookup_table[$1]/eg;
  debug "Decrypted file ID: $fileID (seed is $shuffle_seed)";

  # Session ID seems to be just the Unix time + '1' + 7 random digits,
  # the _00 part seems to mean something that I can't figure out
  my $sID = sprintf "%s1%07d_00", time, rand( 10000000 ) ;

  # Now these are funky
  my $key1 = extract($data, 'key1');
  my $key2 = extract($data, 'key2');
  my $key = sprintf "%s%x", $key2, hex( $key1 ) ^ hex( 'a55aa5a5' );

  # Video title is in escaped unicode format
  my $title = extract($data, 'title');
  $title =~ s/\\u([a-f0-9]{4})/chr(hex $1)/egi;

  # Use the video title as the filename when available
  my $filename = get_video_filename( $stream );
  $filename = title_to_filename( $title, $stream ) if $title;

  my $segs = extract($segmap, $stream, 'ARRAY');

  my @urls;
  my $segment_count = 0;

  for my $seg (@$segs) {
    my $segment_number = extract($seg, 'no');
    my $segment_size = extract($seg, 'size');
    my $segment_seconds = extract($seg, 'seconds');
    $key = extract($seg, 'k') if exists $seg->{'k'};

    # To download segments other than the first (00), we replace
    # the digits at position 8 in the file ID with the segment
    # number as a two digit upper-case hexidecimal
    my $segment_number_str = sprintf '%02X', $segment_number;
    my $segment_fileID = $fileID;
    substr $segment_fileID, 8, 2, $segment_number_str;

    # Combine it all for the request to grab the video link for this segment
    $browser->get(
      sprintf "http://f.youku.com/player/getFlvPath/sid/%s/st/%s/fileid/%s?K=%s&myp=0&ts=%s",
        $sID, $stream, $segment_fileID, $key, $segment_seconds );

    # If we're successful, we should get a 302 with the location of the segment
    my $url = $browser->response->header( 'Location' );
    die "Youku rejected our attempt to get the video, we're probably out of date"
      unless $browser->response->code eq 302 and $url;

    # Sometimes, for whatever reason, the location we get back is missing
    # the file extension
    debug "Video location for segment $segment_number is $url";
    $url = "$url.$stream" unless $url =~ /$stream$/;

    debug sprintf "%s, segment %d, %s seconds, %s bytes",
      $title, $segment_number, $segment_seconds, $segment_size
      if ( $title and $segment_seconds and $segment_size );

    # The array record for this segment contains:
    # 0: download url of the segment
    # 1: index number of the segment (first is 1)
    # 2: total number of segments (filled in after this loop)
    # 3: size in bytes of the segment
    push @urls, [$url, ++$segment_count, 0, $segment_size];
  }

  # Fill in the total number of segments in all of the
  # segment array records
  $_->[2] = $segment_count for @urls;

  return ( \@urls, $filename );
}

# Modified Fisher-Yates shuffle
sub shuffle_table {
  my ( $seed ) = @_;
  my @lookup
    = split //,
      q`abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/\:._-1234567890`;

  my @shuffled;
  while ( $#lookup > 0 )
  {
    # PRNG is a standard linear congruential generator
    # with a = 211, c = 30031, and m = 2^16
    $seed = ( 211 * $seed + 30031 ) % 2**16;

    # i.e. move a randomly chosen character from the source
    # deck onto the end of the shuffled deck
    my $x = int( $seed / 2**16 * ( $#lookup + 1 ) );
    push @shuffled, splice( @lookup, $x, 1 );
  }
  return @shuffled;
}

sub can_handle {
  my($self, $browser, $url) = @_;

  return 1 if $url && URI->new($url)->host =~ /\.youku\.com$/;

  return $browser->content =~ m{<param[^>]+name=['"]src['"][^>]+value=["']http://player\.youku\.com/player\.php/sid/[^/]+/v\.swf};
}

1;