wip: start balancer exit pool hook dapp poc

apps/cowswap-frontend/src/modules/hooksStore/cow-shed/constants.ts

@@ -0,0 +1,128 @@
+export const FACTORY_ABI = [
+  {
+    type: 'function',
+    name: 'executeHooks',
+    inputs: [
+      {
+        name: 'calls',
+        type: 'tuple[]',
+        internalType: 'struct Call[]',
+        components: [
+          {
+            name: 'target',
+            type: 'address',
+            internalType: 'address',
+          },
+          {
+            name: 'value',
+            type: 'uint256',
+            internalType: 'uint256',
+          },
+          {
+            name: 'callData',
+            type: 'bytes',
+            internalType: 'bytes',
+          },
+          {
+            name: 'allowFailure',
+            type: 'bool',
+            internalType: 'bool',
+          },
+          {
+            name: 'isDelegateCall',
+            type: 'bool',
+            internalType: 'bool',
+          },
+        ],
+      },
+      {
+        name: 'nonce',
+        type: 'bytes32',
+        internalType: 'bytes32',
+      },
+      {
+        name: 'deadline',
+        type: 'uint256',
+        internalType: 'uint256',
+      },
+      {
+        name: 'user',
+        type: 'address',
+        internalType: 'address',
+      },
+      {
+        name: 'signature',
+        type: 'bytes',
+        internalType: 'bytes',
+      },
+    ],
+    outputs: [],
+    stateMutability: 'nonpayable',
+  },
+] as const
+
+export const SHED_ABI = [
+  {
+    type: 'function',
+    name: 'executeHooks',
+    inputs: [
+      {
+        name: 'calls',
+        type: 'tuple[]',
+        internalType: 'struct Call[]',
+        components: [
+          {
+            name: 'target',
+            type: 'address',
+            internalType: 'address',
+          },
+          {
+            name: 'value',
+            type: 'uint256',
+            internalType: 'uint256',
+          },
+          {
+            name: 'callData',
+            type: 'bytes',
+            internalType: 'bytes',
+          },
+          {
+            name: 'allowFailure',
+            type: 'bool',
+            internalType: 'bool',
+          },
+          {
+            name: 'isDelegateCall',
+            type: 'bool',
+            internalType: 'bool',
+          },
+        ],
+      },
+      {
+        name: 'nonce',
+        type: 'bytes32',
+        internalType: 'bytes32',
+      },
+      {
+        name: 'deadline',
+        type: 'uint256',
+        internalType: 'uint256',
+      },
+      {
+        name: 'signature',
+        type: 'bytes',
+        internalType: 'bytes',
+      },
+    ],
+    outputs: [],
+    stateMutability: 'nonpayable',
+  },
+] as const
+
+export const PROXY_CREATION_CODE = '0x'
+
+// TODO: update this once the contract is deployed
+export const COW_SHED_FACTORY = '0xBB64Eb2cE6C4Fecc3EE0b18A415c536b147d6727'
+export const COW_SHED_IMPLEMENTATION = '0x0CCb8fDAA217943D52Db003703b75b66523295a1'
+export const proxyInitCode =
+  '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'

apps/cowswap-frontend/src/modules/hooksStore/cow-shed/index.ts

@@ -0,0 +1,118 @@
+import { ethers, getCreate2Address, solidityPacked, solidityPackedKeccak256, TypedDataEncoder } from 'ethers_v6'
+
+import { FACTORY_ABI, PROXY_CREATION_CODE, SHED_ABI } from './constants'
+
+export interface ISdkOptions {
+  factoryAddress: string
+  proxyCreationCode?: string
+  implementationAddress: string
+  chainId: number
+}
+
+export interface ICall {
+  target: string
+  value: bigint
+  callData: string
+  allowFailure: boolean
+  isDelegateCall: boolean
+}
+
+export interface IExecuteHooks {
+  calls: ICall[]
+  nonce: string
+  deadline: bigint
+}
+
+const ABI_CODER = new ethers.AbiCoder()
+
+const DOMAIN_TYPE = {
+  EIP712Domain: [
+    { type: 'string', name: 'name' },
+    { type: 'string', name: 'version' },
+    { type: 'uint256', name: 'chainId' },
+    { type: 'address', name: 'verifyingContract' },
+  ],
+}
+
+export const COW_SHED_712_TYPES = {
+  ExecuteHooks: [
+    { type: 'Call[]', name: 'calls' },
+    { type: 'bytes32', name: 'nonce' },
+    { type: 'uint256', name: 'deadline' },
+  ],
+  Call: [
+    { type: 'address', name: 'target' },
+    { type: 'uint256', name: 'value' },
+    { type: 'bytes', name: 'callData' },
+    { type: 'bool', name: 'allowFailure' },
+    { type: 'bool', name: 'isDelegateCall' },
+  ],
+}
+const FACTORY_INTERFACE: ethers.Interface = new ethers.Interface(FACTORY_ABI)
+const SHED_INTERFACE: ethers.Interface = new ethers.Interface(SHED_ABI)
+
+export class CowShedSdk {
+  constructor(private options: ISdkOptions) {}
+
+  computeProxyAddress(user: string) {
+    const salt = ABI_CODER.encode(['address'], [user])
+    const initCodeHash = solidityPackedKeccak256(
+      ['bytes', 'bytes'],
+      [this._proxyCreationCode(), ABI_CODER.encode(['address', 'address'], [this.options.implementationAddress, user])]
+    )
+    return getCreate2Address(this.options.factoryAddress, salt, initCodeHash)
+  }
+
+  computeDomainSeparator(proxy: string) {
+    return TypedDataEncoder.hashStruct('EIP712Domain', DOMAIN_TYPE, this._getDomain(proxy))
+  }
+
+  hashToSignWithProxy(calls: ICall[], nonce: string, deadline: bigint, proxy: string) {
+    return this._hashToSign(calls, nonce, deadline, proxy)
+  }
+
+  hashToSignWithUser(calls: ICall[], nonce: string, deadline: bigint, user: string) {
+    return this._hashToSign(calls, nonce, deadline, this.computeProxyAddress(user))
+  }
+
+  static encodeExecuteHooksForFactory(
+    calls: ICall[],
+    nonce: string,
+    deadline: bigint,
+    user: string,
+    signature: string
+  ) {
+    return FACTORY_INTERFACE.encodeFunctionData('executeHooks', [calls, nonce, deadline, user, signature])
+  }
+
+  static encodeExecuteHooksForProxy(calls: ICall[], nonce: string, deadline: bigint, signature: string) {
+    return SHED_INTERFACE.encodeFunctionData('executeHooks', [calls, nonce, deadline, signature])
+  }
+
+  static encodeEOASignature(r: bigint, s: bigint, v: number) {
+    return solidityPacked(['uint', 'uint', 'uint8'], [r, s, v])
+  }
+
+  _hashToSign(calls: ICall[], nonce: string, deadline: bigint, proxy: string) {
+    const message: IExecuteHooks = {
+      calls,
+      nonce,
+      deadline,
+    }
+    return { domain: this._getDomain(proxy), types: COW_SHED_712_TYPES, value: message }
+  }
+
+  private _getDomain(proxy: string) {
+    const domain = {
+      name: 'COWShed',
+      version: '1.0.0',
+      chainId: this.options.chainId,
+      verifyingContract: proxy,
+    }
+    return domain
+  }
+
+  private _proxyCreationCode() {
+    return this.options.proxyCreationCode ?? PROXY_CREATION_CODE
+  }
+}