fix: can't parse CommitmentTxPayload (#252)

lib/transaction/payload/commitmenttxpayload.js

@@ -18,6 +18,7 @@ var CURRENT_PAYLOAD_VERSION = 1;
  * @property {number} qfcVersion	uint16_t	2	Version of the final commitment message
  * @property {number} llmqtype	uint8_t	1	type of the long living masternode quorum
  * @property {string} quorumHash	uint256	32	The quorum identifier
+ * @property {number} quorumIndex	int16	2	The quorum index
  * @property {number} signersSize	compactSize uint	1-9	Bit size of the signers bitvector
  * @property {string} signers	byte[]	(bitSize + 7) / 8	Bitset representing the aggregated signers of this final commitment
  * @property {number} validMembersSize	compactSize uint	1-9	Bit size of the validMembers bitvector
@@ -35,6 +36,7 @@ var CURRENT_PAYLOAD_VERSION = 1;
  * @property {number} qfcVersion
  * @property {number} llmqtype
  * @property {string} quorumHash
+ * @property {number} quorumIndex
  * @property {number} signersSize
  * @property {string} signers
  * @property {number} validMembersSize
@@ -54,6 +56,7 @@ function CommitmentTxPayload(options) {
     this.qfcVersion = options.qfcVersion;
     this.llmqtype = options.llmqtype;
     this.quorumHash = options.quorumHash;
+    this.quorumIndex = options.quorumIndex;
     this.signers = options.signers;
     this.validMembers = options.validMembers;
     this.quorumPublicKey = options.quorumPublicKey;
@@ -84,6 +87,10 @@ CommitmentTxPayload.fromBuffer = function fromBuffer(rawPayload) {
     .read(constants.SHA256_HASH_SIZE)
     .toString('hex');
 
+  if (payload.version >= constants.HASH_QUORUM_INDEX_REQUIRED_VERSION) {
+    payload.quorumIndex = payloadBufferReader.readInt16LE();
+  }
+
   payload.signersSize = payloadBufferReader.readVarintNum();
   var signersBytesToRead = Math.floor((payload.signersSize + 7) / 8) || 1;
   payload.signers = payloadBufferReader
@@ -157,6 +164,14 @@ CommitmentTxPayload.prototype.validate = function () {
     utils.isHexaString(this.quorumHash),
     'Expect quorumHash to be a hex string'
   );
+
+  if (this.version >= constants.HASH_QUORUM_INDEX_REQUIRED_VERSION) {
+    Preconditions.checkArgument(
+      Number.isInteger(this.quorumIndex),
+      'Expect quorumHash to be an integer'
+    );
+  }
+
   Preconditions.checkArgument(
     utils.isHexaString(this.signers),
     'Expect signers to be a hex string'
@@ -206,6 +221,10 @@ CommitmentTxPayload.prototype.toJSON = function toJSON(options) {
     sig: this.sig,
   };
 
+  if (this.version >= constants.HASH_QUORUM_INDEX_REQUIRED_VERSION) {
+    payloadJSON.quorumIndex = this.quorumIndex;
+  }
+
   return payloadJSON;
 };
 
@@ -226,7 +245,13 @@ CommitmentTxPayload.prototype.toBuffer = function toBuffer(options) {
     .writeUInt32LE(this.height)
     .writeUInt16LE(this.qfcVersion)
     .writeUInt8(this.llmqtype)
-    .write(Buffer.from(this.quorumHash, 'hex'))
+    .write(Buffer.from(this.quorumHash, 'hex'));
+
+  if (this.version >= constants.HASH_QUORUM_INDEX_REQUIRED_VERSION) {
+    payloadBufferWriter.writeInt16LE(this.quorumIndex);
+  }
+
+  payloadBufferWriter
     .writeVarintNum(this.signersSize)
     .write(Buffer.from(this.signers, 'hex'))
     .writeVarintNum(this.validMembersSize)