feat(smart-wallet-sdk): add 712 hashTypedData

sdks/smart-wallet-sdk/src/constants.ts

@@ -8,6 +8,12 @@ export const DELEGATION_MAGIC_PREFIX = '0xef0100';
  */
 export const SELF_CALL_TARGET = "0x0000000000000000000000000000000000000000"
 
+/**
+ * EIP-712 domain name and version
+ */
+export const DOMAIN_NAME = "Uniswap Minimal Delegation"
+export const DOMAIN_VERSION = "1"
+
 /**
  * Call types for smart wallet calls
  * Follows ERC-7579

sdks/smart-wallet-sdk/src/utils/callPlanner.test.ts

@@ -68,6 +68,14 @@ describe('CallPlanner', () => {
     })
   })
 
+  describe('hashTypedData', () => {
+    it('should hash the calls using EIP-712', () => {
+      const planner = new CallPlanner([{ to: TEST_ADDRESS_1, data: TEST_DATA_1, value: TEST_VALUE_1 }])
+      const hash = planner.hashTypedData(TEST_ADDRESS_1, 1)
+      expect(hash).toBeDefined()
+    })
+  })
+
   describe('add', () => {
     it('should add a new call to the calls array', () => {
       const planner = new CallPlanner()

sdks/smart-wallet-sdk/src/utils/callPlanner.ts

@@ -1,5 +1,6 @@
-import { encodeAbiParameters } from 'viem'
+import { encodeAbiParameters, hashTypedData } from 'viem'
 
+import { DOMAIN_NAME, DOMAIN_VERSION } from '../constants'
 import { Call } from '../types'
 
 // Define the ABI parameter type for the call tuple
@@ -14,6 +15,17 @@ const CALL_ABI_PARAMS = [
   }
 ] as const
 
+const TYPES = {
+  Call: [
+    { name: 'to', type: 'address' },
+    { name: 'value', type: 'uint256' },
+    { name: 'data', type: 'bytes' }
+  ],
+  Execute: [
+    { name: 'calls', type: 'Call[]' }
+  ]
+}
+
 /**
  * CallPlanner is used to encode a series Calls
  */
@@ -54,6 +66,28 @@ export class CallPlanner {
     return encodeAbiParameters(CALL_ABI_PARAMS, [this.calls])
   }
 
+  /**
+   * Hash the calls using EIP-712
+   * @param verifyingContract The verifying contract (should be the signer's account address)
+   * @param chainId The chain ID
+   * @returns The hash of the calls
+   */
+  hashTypedData(verifyingContract: `0x${string}`, chainId: number): `0x${string}` {
+    return hashTypedData({
+      domain: {
+        name: DOMAIN_NAME,
+        version: DOMAIN_VERSION,
+        chainId,
+        verifyingContract
+      },
+      types: TYPES,
+      primaryType: 'Execute',
+      message: {
+        calls : this.calls
+      }
+    })
+  }
+
   /**
    * Add a command to execute a call
    * @param to The target address of the call