bigchain-threshold-output.js

const bigchain = require('bigchaindb-driver')

const API_PATH = 'http://localhost:9984/api/v1/'
const bigchainConnection = new bigchain.Connection(API_PATH)

var aliceKey = new bigchain.Ed25519Keypair()
var bobKey = new bigchain.Ed25519Keypair()

// Condition that BOTH Alice AND Bob are needed to fulfill this output
var subConditionUser = bigchain.Transaction.makeEd25519Condition(aliceKey.publicKey, false)
var subConditionIndorse = bigchain.Transaction.makeEd25519Condition(bobKey.publicKey, false)
var condition = bigchain.Transaction.makeThresholdCondition(2, [subConditionUser, subConditionIndorse])
var outputs = [ bigchain.Transaction.makeOutput(condition), ]

var issuers = aliceKey.publicKey

var txCreateAssetThreshold = bigchain.Transaction.makeCreateTransaction(
        { myAsset: 'some asset' },
        { message: 'This create transaction can only be transfered if both Alice and Bob allow it' },
        outputs,
        issuers
)

var txCreateAssetThresholdSigned = bigchain.Transaction.signTransaction(
  txCreateAssetThreshold,
  aliceKey.privateKey
)
console.log('========================txCreateAssetThresholdSigned')
console.log(txCreateAssetThresholdSigned)

bigchainConnection.postTransaction(txCreateAssetThresholdSigned)
        .then(() => bigchainConnection.pollStatusAndFetchTransaction(txCreateAssetThresholdSigned.id))
        .then(() => bigchainConnection.getStatus(txCreateAssetThresholdSigned.id))
        .then((status) => {
          if (status.status == 'valid') {
            return
          }
        }).then(() => {
          // We can successfully get to this point in the program

          // Create a transfer transaction referrencing the Threshold condition asset
          var txTransferAssetSimple = bigchain.Transaction.makeTransferTransaction(
            txCreateAssetThresholdSigned,
            { message: 'This should create a transaction that can only be transfered by Bob'},
            [bigchain.Transaction.makeEd25519Condition(bobKey.publicKey), ],
            0
          )

          // Fullfil the output conditions by signing it as Bob and Alice (both are required)
          console.log('========================txTransferAssetSimple')
          console.log(txTransferAssetSimple)
          var txTransferAssetSimpleSignedByAlice = bigchain.Transaction.signTransaction(
            txTransferAssetSimple,
            aliceKey.privateKey
          )
          console.log('========================txTransferAssetSimpleSignedByAlice')
          console.log(txTransferAssetSimpleSignedByAlice)

          var txTransferAssetSimpleSignedByAliceAndBob = bigchain.Transaction.signTransaction(
            txTransferAssetSimpleSignedByAlice,
            bobKey.privateKey
          )
          console.log('========================txTransferAssetSimpleSignedByAliceAndBob')
          console.log(txTransferAssetSimpleSignedByAliceAndBob)

          // NOTE: the following will not work...
          // var txTransferAssetSimpleSignedDouble = bigchain.Transaction.signTransaction(
          //   txTransferAssetSimple,
          //   [aliceKey.privateKey, bobKey.privateKey]
          // )
          // console.log('========================txTransferAssetSimpleSignedDouble')
          // console.log(txTransferAssetSimpleSignedDouble)

          // NOTE: This call will fail.
          // Server responds with code 400 'BAD REQUEST'
          bigchainConnection.postTransaction(txTransferAssetSimpleSigned)
                  .then(() => bigchainConnection.pollStatusAndFetchTransaction(txTransferAssetSimpleSigned.id))
                  .then(() => bigchainConnection.getStatus(txTransferAssetSimpleSigned.id))
                  .then((status) => {
                    if (status.status == 'valid') {
                      console.log('Transaction successfully posted to bigchain')
                    }
                  })
        }).catch((err) => console.log(err))