Class: YoutubeAudio::ExtractDecodeFunction

Inherits:
Object
  • Object
show all
Defined in:
lib/youtube_audio/extract_decode_function.rb

Constant Summary collapse

CIPHER_TEST = 
Regexp.new('([\\w$]+)\\s*=\\s*function\\((\\w+)\\)\\{\\s*\\2=\\s*\\2\\.split\\(""\\)\\s*;')

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(player_script) ⇒ ExtractDecodeFunction

Returns a new instance of ExtractDecodeFunction.



8
9
10
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 8

def initialize(player_script)
  @player_script = player_script
end

Instance Attribute Details

#player_script ⇒ Object (readonly)

Returns the value of attribute player_script.



5
6
7
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 5

def player_script
  @player_script
end

Instance Method Details

#cipher_helper_object_name ⇒ Object 



12
13
14
15
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 12

def cipher_helper_object_name
  @cipher_helper_object_name ||=
    decipher_function.scan(/\;([a-zA-Z0-9]{0,255})\./).flatten.first
end

#cipher_helpers_object ⇒ Object 



17
18
19
20
21
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 17

def cipher_helpers_object
  object_decibper_index = player_script.index("var #{cipher_helper_object_name}={")
  object_decibper_index_end = player_script[object_decibper_index..-1].index('};')
  player_script[object_decibper_index..object_decibper_index + object_decibper_index_end]
end

#decipher_function ⇒ Object 



23
24
25
26
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 23

def decipher_function
  @decipher_function ||=
    player_script.scan(Regexp.new(function_pattern)).flatten.first
end

#decryption_function ⇒ Object 



28
29
30
 
# File 'lib/youtube_audio/extract_decode_function.rb', line 28

def decryption_function
  @decryption_function ||= player_script.scan(CIPHER_TEST).flatten.first
end