utils to compute withdrawal address

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@reservoir0x/relay-protocol-sdk",
-  "version": "0.0.60",
+  "version": "0.0.61",
   "description": "Relay protocol SDK",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

src/index.ts

@@ -64,7 +64,10 @@ import {
   SubmitWithdrawRequest,
   getSubmitWithdrawRequestHash,
   getWithdrawalAddress,
-} from "./messages/v2.2/allocator";
+  WithdrawalAddressParams,
+  WithdrawalInitiationMessage,
+  WithdrawalInitiatedMessage,
+} from "./messages/v2.2/withdrawal-execution";
 
 export {
   // Order
@@ -126,8 +129,11 @@ export {
   encodeAction,
   decodeAction,
 
-  // Allocator
+  // Onchain withdrawals
   SubmitWithdrawRequest,
   getSubmitWithdrawRequestHash,
   getWithdrawalAddress,
+  WithdrawalAddressParams,
+  WithdrawalInitiationMessage,
+  WithdrawalInitiatedMessage,
 };

src/messages/v2.2/execution.ts

@@ -31,6 +31,11 @@ export type ExecutionMessage = {
   metadata?: ExecutionMessageMetadata[];
 };
 
+export type ExecutionMetadata = Omit<
+  ExecutionMessageMetadata,
+  "oracleContract" | "oracleChainId"
+>;
+
 export const getExecutionMessageId = (message: ExecutionMessage) => {
   return hashStruct({
     types: {

src/messages/v2.2/withdrawal-execution.ts

@@ -0,0 +1,137 @@
+import { Hex, Address, encodePacked, keccak256 } from "viem";
+
+export interface SubmitWithdrawRequest {
+  chainId: string; // chainId of the destination chain on which the user will withdraw
+  depository: string; // address of the depository account
+  currency: string;
+  amount: string; // Amount to withdraw
+  spender: string; // address of the account that owns the balance in the Hub contract (can be an alias)
+  receiver: string; // Address of the account on the destination chain
+  data: string; // add tional data
+  nonce: string; // Nonce for replay protection
+}
+
+export const getSubmitWithdrawRequestHash = (
+  request: SubmitWithdrawRequest
+) => {
+  // EIP712 type from RelayAllocator
+  const PAYLOAD_TYPEHASH = keccak256(
+    "SubmitWithdrawRequest(uint256 chainId,string depository,string currency,uint256 amount,address spender,string receiver,bytes data,bytes32 nonce)" as Hex
+  );
+
+  // Create EIP712 digest
+  const digest = keccak256(
+    encodePacked(
+      [
+        "bytes32",
+        "uint256",
+        "bytes32",
+        "bytes32",
+        "uint256",
+        "address",
+        "bytes32",
+        "bytes32",
+        "bytes32",
+      ],
+      [
+        PAYLOAD_TYPEHASH,
+        BigInt(request.chainId),
+        keccak256(request.depository as Hex),
+        keccak256(request.currency as Hex),
+        BigInt(request.amount),
+        request.spender as Address,
+        keccak256(request.receiver as Hex),
+        keccak256(request.data as Hex),
+        request.nonce as Hex,
+      ]
+    )
+  );
+
+  // The withdrawal address is the digest itself (as a hex string)
+  return digest;
+};
+
+export type WithdrawalAddressParams = {
+  depositoryAddress: string;
+  depositoryChainId: bigint;
+  currency: string;
+  owner: string;
+  recipientAddress: string;
+  amount: bigint;
+  withdrawalNonce: string;
+};
+
+/**
+ * Compute deterministic withdrawal address
+ *
+ * @param depositoryAddress the depository contract holding the funds on origin chain
+ * @param depositoryChainId the chain id of the depository contract currently holding the funds
+ * @param currency the id of the currency as expressed on origin chain (string)
+ * @param recipientAddress the address that will receive the withdrawn funds on destination chain
+ * @param owner the address that owns the balance before the withdrawal is initiated
+ * @param amount the balance to withdraw
+ * @param withdrawalNonce nonce to prevent collisions for similar withdrawals
+ * @returns withdrawal address (in lower case)
+ */
+export function getWithdrawalAddress(
+  withdrawalParams: WithdrawalAddressParams
+): string {
+  // pack and hash data
+  const nonce = keccak256(
+    encodePacked(["string"], [withdrawalParams.withdrawalNonce])
+  );
+  const hash = keccak256(
+    encodePacked(
+      [
+        "address",
+        "uint256",
+        "string",
+        "address",
+        "address",
+        "uint256",
+        "bytes32",
+      ],
+      [
+        withdrawalParams.depositoryAddress as `0x${string}`,
+        withdrawalParams.depositoryChainId,
+        withdrawalParams.currency,
+        withdrawalParams.recipientAddress as `0x${string}`,
+        withdrawalParams.owner as `0x${string}`,
+        withdrawalParams.amount,
+        nonce,
+      ]
+    )
+  );
+
+  // get 40 bytes for an address
+  const withdrawalAddress = hash.slice(2).slice(-40).toLowerCase();
+  return `0x${withdrawalAddress}` as `0x${string}`;
+}
+
+// for oracle requests, we replace the hub chain id by a slug (e.g. 'base')
+// and we pass the amount as a string
+export type WithdrawalAddressRequest = Omit<
+  WithdrawalAddressParams,
+  "depositoryChainId" | "amount"
+> & {
+  depositoryChainSlug: string;
+  amount: string;
+};
+
+// types for oracle routes
+export type WithdrawalInitiationMessage = {
+  data: WithdrawalAddressRequest & { settlementChainId: string };
+  result: {
+    withdrawalAddress: string;
+  };
+};
+
+export type WithdrawalInitiatedMessage = {
+  data: WithdrawalAddressRequest & {
+    settlementChainId: string;
+  };
+  result: {
+    proofOfWithdrawalAddressBalance: string;
+    withdrawalAddress: string;
+  };
+};

test/withdrawal-execution.test.ts

@@ -0,0 +1,22 @@
+import { describe, it, expect } from "vitest";
+import { getWithdrawalAddress } from "../src/messages/v2.2/withdrawal-execution";
+import { getAddress } from "viem";
+
+describe("getWithdrawalAddress", () => {
+  it("should return a valid withdrawal address", () => {
+    const params = {
+      depositoryAddress: "0x1234567890123456789012345678901234567890",
+      depositoryChainId: 1n,
+      currency: "10340230",
+      recipientAddress: "0x9876543210987654321098765432109876543210",
+      owner: "0x9876543210987654321098765432109876543210",
+      amount: 1000n,
+      withdrawalNonce: "haha",
+    };
+
+    const address = getWithdrawalAddress(params);
+    expect(address).toMatch(/^0x[0-9a-f]{40}$/i);
+    expect(address).toBeTruthy();
+    expect(getAddress(address).toLowerCase()).toMatch(address);
+  });
+});