Class: OneApm::Agent::Obfuscator

Inherits:
Object
  • Object
show all
Defined in:
lib/one_apm/support/obfuscator.rb

Constant Summary collapse

OA_EMPTY_KEY_BYTES = 
[0]
OA_PACK_FORMAT = 
'm'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key, length = nil) ⇒ Obfuscator

RUM uses a shortened key, so just trim it up front



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# File 'lib/one_apm/support/obfuscator.rb', line 15

def initialize(key, length=nil)
  if key.nil? || key.empty?
    @key_bytes = OA_EMPTY_KEY_BYTES
  else
    @key_bytes = key.bytes.to_a
    @key_bytes = @key_bytes.first(length) if length
  end
end

Instance Attribute Details

#key_bytes ⇒ Object (readonly)

Returns the value of attribute key_bytes.



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# File 'lib/one_apm/support/obfuscator.rb', line 9

def key_bytes
  @key_bytes
end

Instance Method Details

#deobfuscate(text) ⇒ Object 



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# File 'lib/one_apm/support/obfuscator.rb', line 28

def deobfuscate(text)
  encode(text.unpack(OA_PACK_FORMAT).first )
end

#encode(text) ⇒ Object 



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# File 'lib/one_apm/support/obfuscator.rb', line 32

def encode(text)
  return text unless key_bytes

  encoded = ""
  encoded.force_encoding('binary') if encoded.respond_to?( :force_encoding )
  index = 0
  text.each_byte do |byte|
    encoded.concat((byte ^ key_bytes[index % key_bytes.length]))
    index+=1
  end
  encoded
end

#obfuscate(text) ⇒ Object 



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# File 'lib/one_apm/support/obfuscator.rb', line 24

def obfuscate(text)
  [ encode(text) ].pack(OA_PACK_FORMAT).gsub(/\n/, '')
end