From dc09dae85178f1ec15f551011d6dae822b238f1a Mon Sep 17 00:00:00 2001
From: Denis Angell <dangell@transia.co>
Date: Fri, 23 Jun 2023 15:33:20 +0000
Subject: [PATCH] add `hashURIToken`

---
 packages/xrpl/src/utils/hashes/index.ts        | 16 ++++++++++++++++
 packages/xrpl/src/utils/hashes/ledgerSpaces.ts |  1 +
 packages/xrpl/src/utils/index.ts               |  2 ++
 packages/xrpl/test/utils/hashes.test.ts        | 11 +++++++++++
 4 files changed, 30 insertions(+)

diff --git a/packages/xrpl/src/utils/hashes/index.ts b/packages/xrpl/src/utils/hashes/index.ts
index 2ed7c923..8b817280 100644
--- a/packages/xrpl/src/utils/hashes/index.ts
+++ b/packages/xrpl/src/utils/hashes/index.ts
@@ -6,6 +6,8 @@
 import { decodeAccountID } from '@transia/ripple-address-codec'
 import BigNumber from 'bignumber.js'
 
+import { convertStringToHex } from '../stringConversion'
+
 import hashLedger, {
   hashLedgerHeader,
   hashSignedTx,
@@ -184,4 +186,18 @@ export function hashPaymentChannel(
   )
 }
 
+/**
+ * Compute the Hash of an URIToken LedgerEntry.
+ *
+ * @param issuer - Address of the issuer of the URIToken.
+ * @param uri - string uri of the URIToken (not the hex).
+ * @returns The hash of the URIToken LedgerEntry.
+ * @category Utilities
+ */
+export function hashURIToken(issuer: string, uri: string): string {
+  return sha512Half(
+    ledgerSpaceHex('uriToken') + addressToHex(issuer) + convertStringToHex(uri),
+  )
+}
+
 export { hashLedgerHeader, hashSignedTx, hashLedger, hashStateTree, hashTxTree }
diff --git a/packages/xrpl/src/utils/hashes/ledgerSpaces.ts b/packages/xrpl/src/utils/hashes/ledgerSpaces.ts
index e2af0c6a..89dc08a2 100644
--- a/packages/xrpl/src/utils/hashes/ledgerSpaces.ts
+++ b/packages/xrpl/src/utils/hashes/ledgerSpaces.ts
@@ -28,6 +28,7 @@ const ledgerSpaces = {
   signerList: 'S',
   paychan: 'x',
   check: 'C',
+  uriToken: 'U',
   depositPreauth: 'p',
 }
 
diff --git a/packages/xrpl/src/utils/index.ts b/packages/xrpl/src/utils/index.ts
index 078d9d1e..6c96ad53 100644
--- a/packages/xrpl/src/utils/index.ts
+++ b/packages/xrpl/src/utils/index.ts
@@ -39,6 +39,7 @@ import {
   hashLedgerHeader,
   hashEscrow,
   hashPaymentChannel,
+  hashURIToken,
 } from './hashes'
 import { calculateHookOn, hexHookParameters, TTS } from './hooks'
 import parseNFTokenID from './parseNFTokenID'
@@ -173,6 +174,7 @@ const hashes = {
   hashLedgerHeader,
   hashEscrow,
   hashPaymentChannel,
+  hashURIToken,
 }
 
 export {
diff --git a/packages/xrpl/test/utils/hashes.test.ts b/packages/xrpl/test/utils/hashes.test.ts
index 4c96dd6f..7340ffff 100644
--- a/packages/xrpl/test/utils/hashes.test.ts
+++ b/packages/xrpl/test/utils/hashes.test.ts
@@ -15,6 +15,7 @@ import {
   hashAccountRoot,
   hashOfferId,
   hashSignerListId,
+  hashURIToken,
 } from '../../src/utils/hashes'
 import fixtures from '../fixtures/rippled'
 import { assertResultMatch } from '../testUtils'
@@ -143,6 +144,16 @@ describe('Hashes', function () {
     assert.equal(actualEntryHash, expectedEntryHash)
   })
 
+  it('calcURITokenEntryHash', function () {
+    const issuer = 'rDx69ebzbowuqztksVDmZXjizTd12BVr4x'
+    const uri = 'ipfs://cid'
+    const expectedEntryHash =
+      'AFC4233E5C4094952DEF5483DC41488C8744D1268F897C0CB25DE66399591399'
+    const actualEntryHash = hashURIToken(issuer, uri)
+
+    assert.equal(actualEntryHash, expectedEntryHash)
+  })
+
   it('Hash a signed transaction correctly', function () {
     const expected_hash =
       '458101D51051230B1D56E9ACAFAA34451BF65FA000F95DF6F0FF5B3A62D83FC2'