Module: Macaroons::Utils

Defined in:
lib/macaroons/utils.rb

Class Method Summary collapse

Class Method Details

.convert_to_bytes(string) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 6

def self.convert_to_bytes(string)
  string.encode('us-ascii') unless string.nil?
end

.generate_derived_key(key) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 45

def self.generate_derived_key(key)
  Utils.hmac('macaroons-key-generator', key)
end

.hexlify(value) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 10

def self.hexlify(value)
  value.unpack('C*').map { |byte| '%02X' % byte }.join('')
end

.hmac(key, data, digest = nil) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 29

def self.hmac(key, data, digest=nil)
  digest = OpenSSL::Digest.new('sha256') if digest.nil?
  OpenSSL::HMAC.digest(digest, key, data)
end

.sign_first_party_caveat(signature, predicate) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 34

def self.sign_first_party_caveat(signature, predicate)
  Utils.hmac(signature, predicate)
end

.sign_third_party_caveat(signature, verification_id, caveat_id) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 38

def self.sign_third_party_caveat(signature, verification_id, caveat_id)
  verification_id_hash = Utils.hmac(signature, verification_id)
  caveat_id_hash = Utils.hmac(signature, caveat_id)
  combined = verification_id_hash + caveat_id_hash
  Utils.hmac(signature, combined)
end

.truncate_or_pad(string, size = nil) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 18

def self.truncate_or_pad(string, size=nil)
  size = size.nil? ? 32 : size
  if string.length > size
    string[0, size]
  elsif string.length < size
    string + "\0"*(size-string.length)
  else
    string
  end
end

.unhexlify(value) ⇒ Object 



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# File 'lib/macaroons/utils.rb', line 14

def self.unhexlify(value)
  [value].pack('H*')
end