Class: Macaroons::BinarySerializer

Inherits:
BaseSerializer show all
Defined in:
lib/macaroons/serializers/binary.rb

Constant Summary collapse

PACKET_PREFIX_LENGTH = 
4

Instance Method Summary collapse

Instance Method Details

#deserialize(serialized) ⇒ Object 



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# File 'lib/macaroons/serializers/binary.rb', line 29

def deserialize(serialized)
  caveats = []
  decoded = base64_url_decode(serialized)

  index = 0

  while index < decoded.length
    packet_length = decoded[index..(index + PACKET_PREFIX_LENGTH - 1)].to_i(16)
    stripped_packet = decoded[index + PACKET_PREFIX_LENGTH..(index + packet_length - 2)]

    key, value = depacketize(stripped_packet)

    case key
    when 'location'
      location = value
    when 'identifier'
      identifier = value
    when 'cid'
      caveats << Caveat.new(value)
    when 'vid'
      caveats[-1].verification_id = value
    when 'cl'
      caveats[-1].caveat_location = value
    when 'signature'
      signature = value
    else
      raise KeyError, 'Invalid key in binary macaroon. Macaroon may be corrupted.'
    end

    index = index + packet_length
  end
  macaroon = Macaroons::RawMacaroon.new(key: 'no_key', identifier: identifier, location: location)
  macaroon.caveats = caveats
  macaroon.signature = signature
  macaroon
end

#serialize(macaroon) ⇒ Object 



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# File 'lib/macaroons/serializers/binary.rb', line 9

def serialize(macaroon)
  combined = packetize('location', macaroon.location)
  combined += packetize('identifier', macaroon.identifier)

  for caveat in macaroon.caveats
    combined += packetize('cid', caveat.caveat_id)

    if caveat.verification_id and caveat.caveat_location
      combined += packetize('vid', caveat.verification_id)
      combined += packetize('cl', caveat.caveat_location)
    end
  end

  combined += packetize(
    'signature',
    Utils.unhexlify(macaroon.signature)
  )
  base64_url_encode(combined)
end