User story: Execute userOp with Passkey and paymaster (#357)

Fixes #276 Todo: Evaluate if `TestPaymaster` contract is needed with validation logic. If not needed, replace with a `MockContract` instance Changes in PR: - Add a test case showcasing Safe deployment with Passkey signer using Paymaster - Add a test case showcasing userOp execution with existing Safe (with Passkey signer) using Paymaster --------- Co-authored-by: Shebin John <[email protected]> Co-authored-by: Mikhail <[email protected]> Co-authored-by: Nicholas Rodrigues Lordello <[email protected]>
safe-global · Apr 12, 2024 · 74d5a38 · 74d5a38
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diff --git a/modules/passkey/contracts/test/TestDependencies.sol b/modules/passkey/contracts/test/TestDependencies.sol
@@ -3,5 +3,6 @@
 pragma solidity >=0.8.0;
 
 import "@account-abstraction/contracts/interfaces/IEntryPoint.sol";
+import "@account-abstraction/contracts/samples/VerifyingPaymaster.sol";
 import "@safe-global/mock-contract/contracts/MockContract.sol";
 import "@safe-global/safe-4337/contracts/test/TestStakedFactory.sol";
diff --git a/modules/passkey/test/userstories/ExecuteWithPaymaster.spec.ts b/modules/passkey/test/userstories/ExecuteWithPaymaster.spec.ts
@@ -0,0 +1,366 @@
+import { expect } from 'chai'
+import { deployments, ethers } from 'hardhat'
+import { WebAuthnCredentials, decodePublicKey, encodeWebAuthnSignature } from '../utils/webauthn'
+import { buildSafeUserOpTransaction, buildPackedUserOperationFromSafeUserOperation } from '@safe-global/safe-4337/dist/src/utils/userOp'
+import { buildSignatureBytes } from '@safe-global/safe-4337/dist/src/utils/execution'
+
+/**
+ * User story: Execute with Paymaster.
+ * The test cases here cover following flows:
+ * 1. Deploy a Safe with a passkey signer as an owner. The userOp gas is sponsored by a Paymaster.
+ * 2. Execute a userOp with an existing Safe with passkey signer as an owner. The userOp gas is sponsored by a Paymaster.
+ *
+ * The paymaster used in the tests is imported from @account-abstraction/contracts/samples/VerifyingPaymaster.sol.
+ * This contract has a verifyingSigner address which provides approval for sponsoring userOp gas via ECDSA signatures.
+ *
+ */
+describe('Execute userOps with Paymaster: [@userstory]', () => {
+  const generalSetup = deployments.createFixture(async ({ deployments }) => {
+    const { EntryPoint, Safe4337Module, SafeProxyFactory, SafeModuleSetup, SafeL2, FCLP256Verifier, SafeWebAuthnSignerFactory } =
+      await deployments.run()
+
+    const [relayer, verifyingSigner] = await ethers.getSigners()
+
+    const entryPoint = await ethers.getContractAt('IEntryPoint', EntryPoint.address)
+    const module = await ethers.getContractAt(Safe4337Module.abi, Safe4337Module.address)
+    const proxyFactory = await ethers.getContractAt(SafeProxyFactory.abi, SafeProxyFactory.address)
+    const safeModuleSetup = await ethers.getContractAt(SafeModuleSetup.abi, SafeModuleSetup.address)
+    const singleton = await ethers.getContractAt(SafeL2.abi, SafeL2.address)
+    const verifier = await ethers.getContractAt('IP256Verifier', FCLP256Verifier.address)
+    const signerFactory = await ethers.getContractAt('SafeWebAuthnSignerFactory', SafeWebAuthnSignerFactory.address)
+
+    // Deploy a Paymaster contract
+    const paymaster = await (await ethers.getContractFactory('VerifyingPaymaster')).deploy(entryPoint, verifyingSigner)
+
+    // Add deposit in the entrypoint contract so that paymaster can sponsor userOp execution
+    await paymaster.deposit({ value: ethers.parseEther('1') })
+
+    const navigator = {
+      credentials: new WebAuthnCredentials(),
+    }
+
+    // Create a WebAuthn credential for the signer
+    const credential = navigator.credentials.create({
+      publicKey: {
+        rp: {
+          name: 'Safe',
+          id: 'safe.global',
+        },
+        user: {
+          id: ethers.getBytes(ethers.id('chucknorris')),
+          name: 'chucknorris',
+          displayName: 'Chuck Norris',
+        },
+        challenge: ethers.toBeArray(Date.now()),
+        pubKeyCredParams: [{ type: 'public-key', alg: -7 }],
+      },
+    })
+
+    const publicKey = decodePublicKey(credential.response)
+    // Deploy signer contract
+    await signerFactory.createSigner(publicKey.x, publicKey.y, await verifier.getAddress())
+    // Get signer address
+    const signer = await signerFactory.getSigner(publicKey.x, publicKey.y, await verifier.getAddress())
+
+    return {
+      relayer,
+      proxyFactory,
+      safeModuleSetup,
+      module,
+      entryPoint,
+      singleton,
+      signerFactory,
+      navigator,
+      verifier,
+      SafeL2,
+      credential,
+      paymaster,
+      verifyingSigner,
+      signer,
+    }
+  })
+
+  /**
+   * The flow can be summarized as follows:
+   * Step 1: Setup the contracts.
+   * Step 2: Create a userOp with initCode that would deploy a Safe account.
+   * Step 3: Get signature from verifyingSigner account and create paymaster data.
+   * Step 4: Sign userOp with passkey signer.
+   * Step 5: Execute the userOp that deploys a Safe with passkey signer as owner.
+   */
+  describe('New Safe', () => {
+    // Create a fixture to setup the contracts and signer(s)
+    const setupTests = generalSetup
+
+    it('should execute a userOp and deploy a Safe using Paymaster', async () => {
+      const {
+        relayer,
+        proxyFactory,
+        safeModuleSetup,
+        module,
+        entryPoint,
+        singleton,
+        navigator,
+        credential,
+        paymaster,
+        verifyingSigner,
+        SafeL2,
+        signer,
+      } = await setupTests()
+
+      // Step 2: Create a userOp with initCode that would deploy a Safe account.
+
+      // The initializer data to enable the Safe4337Module as a module on a Safe
+      const initializer = safeModuleSetup.interface.encodeFunctionData('enableModules', [[module.target]])
+
+      // Create setup data to deploy a Safe with passkey signer as owner, threshold 1, Safe4337Module as module and fallback handler
+      const setupData = singleton.interface.encodeFunctionData('setup', [
+        [signer],
+        1n,
+        safeModuleSetup.target,
+        initializer,
+        module.target,
+        ethers.ZeroAddress,
+        0,
+        ethers.ZeroAddress,
+      ])
+
+      // Predict the Safe address to construct the userOp
+      const safeSalt = Date.now()
+      // Get predicted Safe address. Alternatively, the Safe address can be retrieved from event logs or calculated off-chain via create2
+      const safe = await proxyFactory.createProxyWithNonce.staticCall(singleton, setupData, safeSalt)
+
+      // Deploy data required in the initCode of the userOp
+      const deployData = proxyFactory.interface.encodeFunctionData('createProxyWithNonce', [singleton.target, setupData, safeSalt])
+
+      const paymasterVerificationGasLimit = 60000
+      const paymasterPostOpGasLimit = 60000
+      let paymasterAndData = ethers.solidityPacked(
+        ['address', 'uint128', 'uint128'],
+        [paymaster.target, paymasterVerificationGasLimit, paymasterPostOpGasLimit],
+      )
+
+      const safeOp = buildSafeUserOpTransaction(
+        safe,
+        ethers.ZeroAddress,
+        0,
+        '0x',
+        await entryPoint.getNonce(safe, 0),
+        await entryPoint.getAddress(),
+        false,
+        true,
+        {
+          initCode: ethers.solidityPacked(['address', 'bytes'], [proxyFactory.target, deployData]),
+          // Set a higher verificationGasLimit to avoid error "AA26 over verificationGasLimit"
+          verificationGasLimit: 600000,
+          paymasterAndData: paymasterAndData,
+        },
+      )
+
+      const packedUserOp = buildPackedUserOperationFromSafeUserOperation({
+        safeOp,
+        signature: '0x',
+      })
+
+      // Step 3: Get signature from verifyingSigner account and create paymaster data.
+      const paymasterValidUntil = 0
+      const paymasterValidAfter = 0
+      const paymasterHash = await paymaster.getHash(packedUserOp, paymasterValidAfter, paymasterValidUntil)
+      const paymasterSignature = await verifyingSigner.signMessage(ethers.getBytes(paymasterHash))
+      const paymasterData = ethers.solidityPacked(
+        ['bytes', 'bytes'],
+        [ethers.AbiCoder.defaultAbiCoder().encode(['uint48', 'uint48'], [paymasterValidAfter, paymasterValidUntil]), paymasterSignature],
+      )
+
+      paymasterAndData = ethers.solidityPacked(
+        ['address', 'uint128', 'uint128', 'bytes'],
+        [paymaster.target, paymasterVerificationGasLimit, paymasterPostOpGasLimit, paymasterData],
+      )
+
+      packedUserOp.paymasterAndData = paymasterAndData
+
+      // Step 4: Sign userOp with Passkey signer.
+      // opHash that will be signed using Passkey credentials
+      const opHash = await module.getOperationHash(packedUserOp)
+
+      const assertion = navigator.credentials.get({
+        publicKey: {
+          challenge: ethers.getBytes(opHash),
+          rpId: 'safe.global',
+          allowCredentials: [{ type: 'public-key', id: new Uint8Array(credential.rawId) }],
+          userVerification: 'required',
+        },
+      })
+
+      // Build the contract signature that a Safe will forward to the signer contract
+      const signature = buildSignatureBytes([
+        {
+          signer: signer,
+          data: encodeWebAuthnSignature(assertion.response),
+          dynamic: true,
+        },
+      ])
+
+      // Set the signature in the packedUserOp
+      packedUserOp.signature = ethers.solidityPacked(['uint48', 'uint48', 'bytes'], [safeOp.validAfter, safeOp.validUntil, signature])
+
+      // Check if Safe is not already created
+      expect(await ethers.provider.getCode(safe)).to.equal('0x')
+
+      // Step 5: Execute the userOp that deploys a Safe with passkey signer as owner.
+      await entryPoint.handleOps([packedUserOp], relayer.address)
+
+      // Check if Safe is created and uses the expected Singleton
+      const [implementation] = ethers.AbiCoder.defaultAbiCoder().decode(['address'], await ethers.provider.getStorage(safe, 0))
+      expect(implementation).to.equal(singleton.target)
+
+      // Check if signer is the Safe owner
+      const safeInstance = await ethers.getContractAt(SafeL2.abi, safe)
+      expect(await safeInstance.getOwners()).to.deep.equal([signer])
+    })
+  })
+
+  /**
+   * The flow can be summarized as follows:
+   * Step 1: Setup the contracts.
+   * Step 2: Create a userOp with callData that transfers 0.2 ethers to address(0).
+   * Step 3: Get signature from verifyingSigner account and create paymaster data.
+   * Step 4: Sign userOp with Passkey signer.
+   * Step 5: Execute the userOp that with an existing Safe with passkey signer as owner.
+   */
+  describe('Existing Safe', () => {
+    // Create a fixture to setup the contracts and signer(s)
+    const setupTests = deployments.createFixture(async ({ deployments }) => {
+      const {
+        relayer,
+        verifyingSigner,
+        proxyFactory,
+        safeModuleSetup,
+        module,
+        entryPoint,
+        singleton,
+        credential,
+        paymaster,
+        navigator,
+        signer,
+      } = await generalSetup(deployments)
+
+      // The initializer data to enable the Safe4337Module as a module on a Safe
+      const initializer = safeModuleSetup.interface.encodeFunctionData('enableModules', [[module.target]])
+
+      // Create setup data to deploy a Safe passkey signer as owner, threshold 1, Safe4337Module as module and fallback handler
+      const setupData = singleton.interface.encodeFunctionData('setup', [
+        [signer],
+        1n,
+        safeModuleSetup.target,
+        initializer,
+        module.target,
+        ethers.ZeroAddress,
+        0,
+        ethers.ZeroAddress,
+      ])
+
+      // Deploy a Safe with passkey signer as owner
+      const safeSalt = Date.now()
+      // Get predicted Safe address. Alternatively, the Safe address can be retrieved from event logs or calculated off-chain via create2
+      const safeAddress = await proxyFactory.createProxyWithNonce.staticCall(singleton, setupData, safeSalt)
+      await proxyFactory.createProxyWithNonce(singleton, setupData, safeSalt)
+
+      return {
+        relayer,
+        module,
+        entryPoint,
+        navigator,
+        credential,
+        paymaster,
+        safeAddress,
+        signer,
+        verifyingSigner,
+      }
+    })
+
+    it('should execute a userOp with an existing Safe using Paymaster', async () => {
+      const { safeAddress, signer, relayer, module, entryPoint, navigator, credential, paymaster, verifyingSigner } = await setupTests()
+
+      const paymasterVerificationGasLimit = 60000
+      const paymasterPostOpGasLimit = 60000
+      let paymasterAndData = ethers.solidityPacked(
+        ['address', 'uint128', 'uint128'],
+        [paymaster.target, paymasterVerificationGasLimit, paymasterPostOpGasLimit],
+      )
+
+      // Step 2: Create a userOp with callData that transfers 0.2 ethers to address(0).
+      const safeOp = buildSafeUserOpTransaction(
+        safeAddress,
+        ethers.ZeroAddress,
+        ethers.parseEther('0.2'),
+        '0x',
+        await entryPoint.getNonce(safeAddress, 0),
+        await entryPoint.getAddress(),
+        false,
+        true,
+        {
+          paymasterAndData: paymasterAndData,
+        },
+      )
+
+      const packedUserOp = buildPackedUserOperationFromSafeUserOperation({
+        safeOp,
+        signature: '0x',
+      })
+
+      // Step 3: Get signature from verifyingSigner account and create paymaster data.
+      const paymasterValidUntil = 0
+      const paymasterValidAfter = 0
+      const paymasterHash = await paymaster.getHash(packedUserOp, paymasterValidAfter, paymasterValidUntil)
+      const paymasterSignature = await verifyingSigner.signMessage(ethers.getBytes(paymasterHash))
+      const paymasterData = ethers.solidityPacked(
+        ['bytes', 'bytes'],
+        [ethers.AbiCoder.defaultAbiCoder().encode(['uint48', 'uint48'], [paymasterValidAfter, paymasterValidUntil]), paymasterSignature],
+      )
+
+      paymasterAndData = ethers.solidityPacked(
+        ['address', 'uint128', 'uint128', 'bytes'],
+        [paymaster.target, paymasterVerificationGasLimit, paymasterPostOpGasLimit, paymasterData],
+      )
+
+      packedUserOp.paymasterAndData = paymasterAndData
+
+      // Step 4: Sign userOp with Passkey signer.
+      // opHash that will be signed using Passkey credentials
+      const opHash = await module.getOperationHash(packedUserOp)
+
+      const assertion = navigator.credentials.get({
+        publicKey: {
+          challenge: ethers.getBytes(opHash),
+          rpId: 'safe.global',
+          allowCredentials: [{ type: 'public-key', id: new Uint8Array(credential.rawId) }],
+          userVerification: 'required',
+        },
+      })
+
+      // Build the contract signature that a Safe will forward to the signer contract
+      const signature = buildSignatureBytes([
+        {
+          signer: signer,
+          data: encodeWebAuthnSignature(assertion.response),
+          dynamic: true,
+        },
+      ])
+
+      // Set the signature in the packedUserOp
+      packedUserOp.signature = ethers.solidityPacked(['uint48', 'uint48', 'bytes'], [safeOp.validAfter, safeOp.validUntil, signature])
+
+      // Send 1 ETH to the Safe
+      await relayer.sendTransaction({ to: safeAddress, value: ethers.parseEther('1') })
+      const balanceBefore = await ethers.provider.getBalance(ethers.ZeroAddress)
+
+      // Step 5: Execute the userOp that with an existing Safe with passkey signer as owner using Paymaster
+      await entryPoint.handleOps([packedUserOp], relayer.address)
+
+      // Check if the address(0) received 0.2 ETH
+      expect(await ethers.provider.getBalance(ethers.ZeroAddress)).to.be.equal(balanceBefore + ethers.parseEther('0.2'))
+      expect(await ethers.provider.getBalance(safeAddress)).to.be.equal(ethers.parseEther('1') - ethers.parseEther('0.2'))
+    })
+  })
+})