Prefix Condition

aSender.js

function createWithSubcondition (pubKey, message) {

  const sender_fulfillment = new cc.Ed25519()

  // Set public_key
  sender_fulfillment.setPublicKey(new Buffer(pubKey, 'hex'))

  // Prefix
  const prefix = new cc.PrefixSha256()
  prefix.setPrefix(message)
  prefix.setSubfulfillment(sender_fulfillment)

  // Condition
  const condition = prefix.getConditionUri()

  console.log(colors.green.bold('SENDER') + '\n');
  console.log(colors.grey.italic('By using a subcondition we embed the message as part of the condition.') + '\n')
  console.log(colors.green('Condition: ' + condition) + '\n')

  return condition

}

bReceiver.js

function fulfillWithSubcondition (pubKey, seed, message) {

  const receiver_fulfillment = new cc.Ed25519()

  console.log(colors.blue.bold('RECEIVER') + '\n');
  console.log(colors.grey.italic('Receives the transaction and signs a message with his/her private key to fulfill the condition.') + '\n')
  console.log(colors.grey.italic('The content of the message IS part of the condition.') + '\n')

  receiver_fulfillment.setPublicKey(pubKey)

  const condition = receiver_fulfillment.getConditionUri()

  receiver_fulfillment.sign(message, seed)

  const prefix = new cc.PrefixSha256()
  prefix.setPrefix(message)
  prefix.setSubfulfillment(receiver_fulfillment)

  const fulfillment = prefix.serializeUri()

  console.log(colors.blue('Fulfillment URI:' + fulfillment) + '\n')

  return fulfillment

}