refactor: define typescript types for OfferCancel Transaction Model (#1512)

* define typescript types for OfferCancel Transaction Model

src/models/transactions/index.ts

@@ -1,5 +1,6 @@
 export * from './transaction'
 export * from './offerCreate'
+export * from './offerCancel'
 export * from './checkCreate'
 export * from './checkCash'
 export * from './checkCancel'

src/models/transactions/offerCancel.ts

@@ -0,0 +1,24 @@
+import { ValidationError } from "../../common/errors"
+import { BaseTransaction, verifyBaseTransaction } from "./common"
+
+export interface OfferCancel extends BaseTransaction {
+    TransactionType: "OfferCancel"
+    OfferSequence: number
+}
+
+/**
+ * Verify the form and type of an OfferCancel at runtime.
+ * 
+ * @param tx - An OfferCancel Transaction
+ * @returns - Void.
+ * @throws - When the OfferCancel is Malformed.
+ */
+ export function verifyOfferCancel(tx: OfferCancel): void {
+    verifyBaseTransaction(tx)
+
+    if (tx.OfferSequence === undefined)
+        throw new ValidationError("OfferCancel: missing field OfferSequence")
+
+    if (typeof tx.OfferSequence !== 'number')
+        throw new ValidationError("OfferCancel: invalid OfferSequence")
+}

src/models/transactions/transaction.ts

@@ -1,13 +1,17 @@
-import Metadata from "../common/metadata";
-import { OfferCreate } from "./offerCreate";
-import { CheckCash } from "./checkCash";
-import { CheckCancel } from "./checkCancel";
-import { CheckCreate } from "./checkCreate";
-import { SignerListSet } from "./signerListSet";
+import Metadata from "../common/metadata"
+import { OfferCreate } from "./offerCreate"
+import { OfferCancel } from "./offerCancel"
+import { CheckCash } from "./checkCash"
+import { CheckCancel } from "./checkCancel"
+import { CheckCreate } from "./checkCreate"
+import { SignerListSet } from "./signerListSet"
 
 export type Transaction =
 //     AccountSet
 //   | AccountDelete
+//   | CheckCancel
+//   | CheckCash
+//   | CheckCreate
        CheckCancel
      | CheckCash
      | CheckCreate
@@ -15,6 +19,7 @@ export type Transaction =
 //   | EscrowCancel
 //   | EscrowCreate
 //   | EscrowFinish
+     | OfferCancel
 //   | OfferCancel
      | OfferCreate
 //   | PaymentTransaction

test/models/checkCancel.ts

@@ -7,7 +7,7 @@ import { assert } from 'chai'
  *
  * Providing runtime verification testing for each specific transaction type
  */
-describe('Transaction Verification', function () {
+describe('CheckCancel Transaction Verification', function () {
 
     it (`verifies valid CheckCancel`, () => {
         const validCheckCancel = {

test/models/offerCancel.ts

@@ -0,0 +1,53 @@
+import { ValidationError } from 'xrpl-local/common/errors'
+import { verifyOfferCancel } from './../../src/models/transactions/offerCancel'
+import { assert } from 'chai'
+
+/**
+ * OfferCancel Transaction Verification Testing
+ *
+ * Providing runtime verification testing for each specific transaction type
+ */
+describe('OfferCancel Transaction Verification', function () {
+   let offer
+   
+   beforeEach(() => {
+       offer = {
+            Account: "rnKiczmiQkZFiDES8THYyLA2pQohC5C6EF",
+            Fee: "10",
+            LastLedgerSequence: 65477334,
+            OfferSequence: 60797528,
+            Sequence: 60797535,
+            SigningPubKey: "0361BFD43D1EEA54B77CC152887312949EBF052997FBFFCDAF6F2653164B55B21...",
+            TransactionType: "OfferCancel",
+            TxnSignature: "30450221008C43BDCFC68B4793857CA47DF454C07E5B45D3F80E8E6785CAB9292...",
+            date: "2021-08-06T21:04:11Z"
+        } as any
+   })
+
+    it (`verifies valid OfferCancel`, () => {        
+        assert.doesNotThrow(() => verifyOfferCancel(offer))        
+    })
+
+    it (`verifies valid OfferCancel with flags`, () => {
+        offer.Flags = 2147483648
+        assert.doesNotThrow(() => verifyOfferCancel(offer))
+    })
+
+    it (`throws w/ invalid OfferSequence`, () => {
+        offer.OfferSequence = '99'
+        assert.throws(
+            () => verifyOfferCancel(offer),
+            ValidationError,
+            "OfferCancel: invalid OfferSequence"
+        )
+    })
+
+    it (`throws w/ missing OfferSequence`, () => {
+        delete offer.OfferSequence
+        assert.throws(
+            () => verifyOfferCancel(offer),
+            ValidationError,
+            "OfferCancel: missing field OfferSequence"
+        )
+    })
+})

test/models/signerListSet.ts

@@ -1,4 +1,4 @@
-import { ValidationError } from 'ripple-api/common/errors'
+import { ValidationError } from 'xrpl-local/common/errors'
 import { verifySignerListSet } from './../../src/models/transactions/signerListSet'
 import { assert } from 'chai'