Support encoding and decoding of NegativeUNL pseudo-transactions (#89)

* Support encoding and decoding of NegativeUNL pseudo-transactions

packages/ripple-binary-codec/src/enums/definitions.json

@@ -40,7 +40,8 @@
     "Check": 67,
     "Nickname": 110,
     "Contract": 99,
-    "GeneratorMap": 103
+    "GeneratorMap": 103,
+    "NegativeUNL": 78
   },
   "FIELDS": [
     [
@@ -1023,6 +1024,36 @@
         "type": "Blob"
       }
     ],
+    [
+      "UNLModifyValidator",
+      {
+        "nth": 19,
+        "isVLEncoded": true,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "Blob"
+      }
+    ],
+    [
+      "ValidatorToDisable",
+      {
+        "nth": 20,
+        "isVLEncoded": true,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "Blob"
+      }
+    ],
+    [
+      "ValidatorToReEnable",
+      {
+        "nth": 20,
+        "isVLEncoded": true,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "Blob"
+      }
+    ],
     [
       "Account",
       {
@@ -1233,6 +1264,16 @@
         "type": "STObject"
       }
     ],
+    [
+      "DisabledValidator",
+      {
+        "nth": 19,
+        "isVLEncoded": false,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "STObject"
+      }
+    ],
     [
       "ArrayEndMarker",
       {
@@ -1323,6 +1364,16 @@
         "type": "STArray"
       }
     ],
+    [
+      "DisabledValidators",
+      {
+        "nth": 17,
+        "isVLEncoded": false,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "STArray"
+      }
+    ],
     [
       "CloseResolution",
       {
@@ -1483,6 +1534,16 @@
         "type": "UInt32"
       }
     ],
+    [
+      "BeginLedgerSeq",
+      {
+        "nth": 40,
+        "isVLEncoded": false,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "UInt32"
+      }
+    ],
     [
       "Channel",
       {
@@ -1523,6 +1584,16 @@
         "type": "UInt8"
       }
     ],
+    [
+      "UNLModifyDisabling",
+      {
+        "nth": 17,
+        "isVLEncoded": false,
+        "isSerialized": true,
+        "isSigningField": true,
+        "type": "UInt8"
+      }
+    ],
     [
       "DestinationNode",
       {
@@ -1685,6 +1756,7 @@
     "AccountDelete": 21,
 
     "EnableAmendment": 100,
-    "SetFee": 101
+    "SetFee": 101,
+    "UNLModify": 102
   }
 }

packages/ripple-binary-codec/src/types/account-id.ts

@@ -7,7 +7,7 @@ import { Hash160 } from "./hash-160";
 class AccountID extends Hash160 {
   static readonly defaultAccountID: AccountID = new AccountID(Buffer.alloc(20));
 
-  constructor(bytes: Buffer) {
+  constructor(bytes?: Buffer) {
     super(bytes ?? AccountID.defaultAccountID.bytes);
   }
 
@@ -23,6 +23,10 @@ class AccountID extends Hash160 {
     }
 
     if (typeof value === "string") {
+      if (value === "") {
+        return new AccountID();
+      }
+
       return /^r/.test(value)
         ? this.fromBase58(value)
         : new AccountID(Buffer.from(value, "hex"));

packages/ripple-binary-codec/src/types/hash-160.ts

@@ -7,7 +7,11 @@ class Hash160 extends Hash {
   static readonly width = 20;
   static readonly ZERO_160: Hash160 = new Hash160(Buffer.alloc(Hash160.width));
 
-  constructor(bytes: Buffer) {
+  constructor(bytes?: Buffer) {
+    if (bytes && bytes.byteLength === 0) {
+      bytes = Hash160.ZERO_160.bytes;
+    }
+
     super(bytes ?? Hash160.ZERO_160.bytes);
   }
 }

packages/ripple-binary-codec/src/types/hash.ts

@@ -9,24 +9,26 @@ class Hash extends Comparable {
 
   constructor(bytes: Buffer) {
     super(bytes);
+    if (this.bytes.byteLength !== (this.constructor as typeof Hash).width) {
+      throw new Error(`Invalid Hash length ${this.bytes.byteLength}`);
+    }
   }
 
   /**
    * Construct a Hash object from an existing Hash object or a hex-string
    *
    * @param value A hash object or hex-string of a hash
-   */ 
+   */
   static from<T extends Hash | string>(value: T): Hash {
-    if(value instanceof this) {
-      return value
+    if (value instanceof this) {
+      return value;
     }
-    
-    if(typeof value === "string") {
+
+    if (typeof value === "string") {
       return new this(Buffer.from(value, "hex"));
     }
 
     throw new Error("Cannot construct Hash from given value");
-    
   }
 
   /**

packages/ripple-binary-codec/src/types/path-set.ts

@@ -29,9 +29,10 @@ interface HopObject extends JsonObject {
  * TypeGuard for HopObject
  */
 function isHopObject(arg): arg is HopObject {
-  return (arg.issuer !== undefined ||
-      arg.account !== undefined ||
-      arg.currency !== undefined
+  return (
+    arg.issuer !== undefined ||
+    arg.account !== undefined ||
+    arg.currency !== undefined
   );
 }
 
@@ -40,9 +41,9 @@ function isHopObject(arg): arg is HopObject {
  */
 function isPathSet(arg): arg is Array<Array<HopObject>> {
   return (
-    Array.isArray(arg) && arg.length === 0 ||
-    Array.isArray(arg) && Array.isArray(arg[0]) && arg[0].length === 0 ||
-    Array.isArray(arg) && Array.isArray(arg[0]) && isHopObject(arg[0][0])
+    (Array.isArray(arg) && arg.length === 0) ||
+    (Array.isArray(arg) && Array.isArray(arg[0]) && arg[0].length === 0) ||
+    (Array.isArray(arg) && Array.isArray(arg[0]) && isHopObject(arg[0][0]))
   );
 }
 

packages/ripple-binary-codec/test/binary-serializer.test.js

@@ -1,7 +1,7 @@
 /* eslint-disable func-style */
 
 const { binary } = require('../dist/coretypes')
-const { encode } = require('../dist')
+const { encode, decode } = require('../dist')
 const { makeParser, BytesList, BinarySerializer } = binary
 const { coreTypes } = require('../dist/types')
 const { UInt8, UInt16, UInt32, UInt64, STObject } = coreTypes
@@ -50,6 +50,8 @@ const PaymentChannel = {
   }
 }
 
+const NegativeUNL = require('./fixtures/negative-unl.json');
+
 function bytesListTest () {
   const list = new BytesList().put(Buffer.from([0])).put(Buffer.from([2, 3])).put(Buffer.from([4, 5]))
   test('is an Array<Buffer>', function () {
@@ -171,6 +173,15 @@ function PaymentChannelTest () {
   })
 }
 
+function NegativeUNLTest () {
+  test('can serialize NegativeUNL', () => {
+    expect(encode(NegativeUNL.tx)).toEqual(NegativeUNL.binary);
+  })
+  test('can deserialize NegativeUNL', () => {
+    expect(decode(NegativeUNL.binary)).toEqual(NegativeUNL.tx);
+  })
+}
+
 describe('Binary Serialization', function() {
   describe('nestedObjectTests', nestedObjectTests);
   describe('BytesList', bytesListTest);
@@ -179,4 +190,5 @@ describe('Binary Serialization', function() {
   describe('SignerListSet', SignerListSetTest);
   describe('Escrow', EscrowTest);
   describe('PaymentChannel', PaymentChannelTest);
+  describe('NegativeUNLTest', NegativeUNLTest);
 })

packages/ripple-binary-codec/test/fixtures/negative-unl.json

@@ -0,0 +1,12 @@
+{
+    "binary": "120066240000000026000003006840000000000000007300701321ED9D593004CC501CACD261BD8E31E863F2B3F6CA69505E7FD54DA8F5690BEFB7AE8114000000000000000000000000000000000000000000101101",
+    "tx": {
+        "UNLModifyDisabling": 1,
+        "LedgerSequence": 768,
+        "UNLModifyValidator": "ED9D593004CC501CACD261BD8E31E863F2B3F6CA69505E7FD54DA8F5690BEFB7AE",
+        "TransactionType": "UNLModify",
+        "Account": "rrrrrrrrrrrrrrrrrrrrrhoLvTp",
+        "Sequence": 0,
+        "Fee": "0",
+        "SigningPubKey": ""}
+}

packages/ripple-binary-codec/test/pseudo-transaction.test.js

@@ -0,0 +1,37 @@
+const { encode, decode } = require('../dist')
+
+let json = {
+    "Account": "rrrrrrrrrrrrrrrrrrrrrhoLvTp",
+    "Sequence": 0,
+    "Fee": "0",
+    "SigningPubKey": "",
+    "Signature": ""
+}
+
+let json_blank_acct = {
+    "Account": "",
+    "Sequence": 0,
+    "Fee": "0",
+    "SigningPubKey": "",
+    "Signature": ""
+}
+
+let binary = "24000000006840000000000000007300760081140000000000000000000000000000000000000000"
+
+describe("Can encode Pseudo Transactions", () => {
+    test("Correctly encodes Pseudo Transaciton", () => {
+        expect(encode(json)).toEqual(binary);
+    })
+
+    test("Can decode account objects", () => {
+        expect(decode(encode(json))).toEqual(json);
+    })
+
+    test("Blank AccountID is ACCOUNT_ZERO", () => {
+        expect(encode(json_blank_acct)).toEqual(binary)
+    })
+
+    test("Decodes Blank AccountID", () => {
+        expect(decode(encode(json_blank_acct))).toEqual(json);
+    })
+})