Web3.js EIP4337 Plugin

( This plugin is developed and maintained by Blocto ).

Web3.js EIP4337 is a web3.js 4.x plugin for Account Abstraction functionality.

Try it out

You can use the CodeSandbox links below to try out Web3.js EIP4337 plugin:

• with Blocto

Prerequisites

• ⚙️ NodeJS (LTS/Fermium)
• 🧰 Yarn

Installation and usage

yarn add @chainsafe/web3-plugin-eip4337

import { Web3 } from "web3";
import { EIP4337Plugin } from "@chainsafe/web3-plugin-eip4337";

const web3 = new Web3("http://127.0.0.1:8545");
web3.registerPlugin(new EIP4337Plugin());

web3.EIP4337.sendUserOperation("...");

Functionality

sendUserOperation

Sends a UserOperation to the bundler. If accepted, the bundler will add it to the UserOperation mempool and return a userOpHash.

Parameters

• UserOperation - represents the structure of a transaction initiated by the user. It contains the sender, receiver, call data, maximum fee per unit of Gas, maximum priority fee, signature, nonce, and other specific elements.

• entryPoint - a singleton contract to execute bundles of UserOperations. Bundlers/Clients whitelist the supported entrypoint.

Returns

• userOperation hash or throws error instead of balance.

Example

web3.EIP4337.sendUserOperation({
    sender: "0x9fd042a18e90ce326073fa70f111dc9d798d9a52",
    nonce: "123",
    initCode: "0x68656c6c6f",
    callData: "0x776F726C64",
    callGasLimit: "1000",
    verificationGasLimit: "2300",
    preVerificationGas: "3100",
    maxFeePerGas: "8500",
    maxPriorityFeePerGas: "1",
    paymasterAndData: "0x626c6f63746f",
    signature: "0x636c656d656e74"
},"0x636c656d656e74").then(console.log);
> 0xe554d0701f7fdc734f84927d109537f1ac4ee4ebfa3670c71d224a4fa15dbcd1

estimateUserOperationGas

Estimate the gas values for a UserOperation. Given UserOperation optionally without gas limits and gas prices, return the needed gas limits. The signature field is ignored by the wallet, so that the operation will not require user's approval. Still, it might require putting a "semi-valid" signature (e.g. a signature in the right length)

Parameters

• UserOperation - represents the structure of a transaction initiated by the user. It contains the sender, receiver, call data, maximum fee per unit of Gas, maximum priority fee, signature, nonce, and other specific elements.

• entryPoint - a singleton contract to execute bundles of UserOperations. Bundlers/Clients whitelist the supported entrypoint.

Returns

• Object having:
  • preVerificationGas gas overhead of this UserOperation
  • verificationGasLimit actual gas used by the validation of this UserOperation
  • callGasLimit value used by inner account execution

Example

web3.EIP4337.estimateUserOperationGas({
    sender: "0x9fd042a18e90ce326073fa70f111dc9d798d9a52",
    nonce: "123",
    initCode: "0x68656c6c6f",
    callData: "0x776F726C64",
    callGasLimit: "1000",
    verificationGasLimit: "2300",
    preVerificationGas: "3100",
    maxFeePerGas: "0",
    maxPriorityFeePerGas: "0",
    paymasterAndData: "0x626c6f63746f",
    signature: "0x636c656d656e74"
},"0x636c656d656e74").then(console.log);
> {
callGasLimit : "0x18b33",
preVerificationGas: "0xdf17",
verificationGasLimit:"0x128c4"
}

getUserOperationByHash

Return a UserOperation based on a hash (userOpHash) returned by eth_sendUserOperation

Parameters

• hash - a userOpHash value returned by eth_sendUserOperation

Returns

• Null in case the UserOperation is not yet included in a block, or a full UserOperation, with the addition of entryPoint, blockNumber, blockHash and transactionHash

Example

web3.EIP4337.getUserOperationByHash("0xxxxx").then(console.log);
> {
userOperation: {
    sender: "xxxx",
    nonce: "xxxx",
    initCode: "0xxxxxxxxxxxxxxx",
    callData: "0xxxxxxxxxxxxxxx",
    callGasLimit: "xxxx",
    verificationGasLimit: "xxxx",
    preVerificationGas: "xxxx",
    maxFeePerGas: "0",
    maxPriorityFeePerGas: "0",
    paymasterAndData: "0xxxxxxxxxxxxxxx",
    signature: "0xxxxxxxxxxxxxxx"
    },
    entryPoint: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789',
    blockNumber: 39642225,
    blockHash: '0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f',
    transactionHash: '0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4',
}

getUserOperationReceipt

Return null in case the UserOperation is not yet included in a block, or

• userOpHash the request hash
• entryPoint
• sender
• nonce
• paymaster the paymaster used for this userOp (or empty)
• actualGasCost - actual amount paid (by account or paymaster) for this UserOperation
• actualGasUsed - total gas used by this UserOperation (including preVerification, creation, validation and execution)
• success boolean - did this execution completed without revert
• reason in case of revert, this is the revert reason
• logs the logs generated by this UserOperation (not including logs of other UserOperations in the same bundle)
• receipt the TransactionReceipt object. Note that the returned TransactionReceipt is for the entire bundle, not only for this UserOperation.

Parameters

• hash - hash a userOpHash value returned by eth_sendUserOperation

Returns

• Null in case the UserOperation is not yet included in a block, or UserOperation receipt

Example

web3.EIPI4337.getUserOperationReceipt("0xa890d7c0dccfd6cebc025919f4857ab97953ae218e82f5e24c297f02ceea5b21").then(console.log);
> {
    "userOpHash": "0xa890d7c0dccfd6cebc025919f4857ab97953ae218e82f5e24c297f02ceea5b21",
    "entryPoint": "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789",
    "sender": "0x026B37A09aF3ceB346c39999c5738F86A1a48f4d",
    "nonce": "0x7",
    "paymaster": "0xa312d8D37Be746BD09cBD9e9ba2ef16bc7Da48FF",
    "actualGasCost": "0x1a036c1638be0",
    "actualGasUsed": "0x2e8d8",
    "success": true,
    "reason": "",
    "logs": [
        {
            "address": "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
            "topics": [
                "0xbb47ee3e183a558b1a2ff0874b079f3fc5478b7454eacf2bfc5af2ff5878f972"
            ],
            "data": "0x",
            "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
            "blockNumber": "0x25ce471",
            "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
            "transactionIndex": "0x44",
            "logIndex": "0x12d",
            "removed": false
        },
        {
            "address": "0xfd8ec18d48ac1f46b600e231da07d1da8209ceef",
            "topics": [
                "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                "0x0000000000000000000000000000000000000000000000000000000000000000",
                "0x000000000000000000000000026b37a09af3ceb346c39999c5738f86a1a48f4d",
                "0x000000000000000000000000000000000000000000000000000000000000007f"
            ],
            "data": "0x",
            "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
            "blockNumber": "0x25ce471",
            "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
            "transactionIndex": "0x44",
            "logIndex": "0x12e",
            "removed": false
        },
        {
            "address": "0x00005ea00ac477b1030ce78506496e8c2de24bf5",
            "topics": [
                "0xe90cf9cc0a552cf52ea6ff74ece0f1c8ae8cc9ad630d3181f55ac43ca076b7d6",
                "0x000000000000000000000000fd8ec18d48ac1f46b600e231da07d1da8209ceef",
                "0x000000000000000000000000026b37a09af3ceb346c39999c5738f86a1a48f4d",
                "0x0000000000000000000000000000a26b00c1f0df003000390027140000faa719"
            ],
            "data": "0x000000000000000000000000026b37a09af3ceb346c39999c5738f86a1a48f4d0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e80000000000000000000000000000000000000000000000000000000000000000",
            "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
            "blockNumber": "0x25ce471",
            "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
            "transactionIndex": "0x44",
            "logIndex": "0x12f",
            "removed": false
        },
        {
            "address": "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
            "topics": [
                "0x49628fd1471006c1482da88028e9ce4dbb080b815c9b0344d39e5a8e6ec1419f",
                "0xa890d7c0dccfd6cebc025919f4857ab97953ae218e82f5e24c297f02ceea5b21",
                "0x000000000000000000000000026b37a09af3ceb346c39999c5738f86a1a48f4d",
                "0x000000000000000000000000a312d8d37be746bd09cbd9e9ba2ef16bc7da48ff"
            ],
            "data": "0x000000000000000000000000000000000000000000000000000000000000000700000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000001a036c1638be0000000000000000000000000000000000000000000000000000000000002e8d8",
            "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
            "blockNumber": "0x25ce471",
            "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
            "transactionIndex": "0x44",
            "logIndex": "0x130",
            "removed": false
        }
    ],
    "receipt": {
        "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
        "transactionIndex": "0x44",
        "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
        "blockNumber": "0x25ce471",
        "from": "0x1e6754b227c6ae4b0ca61d82f79d60660737554a",
        "to": "0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789",
        "cumulativeGasUsed": "0x1716d3b",
        "gasUsed": "0x2b6c6",
        "contractAddress": null,
        "logs": [
            {
                "address": "0xfd8ec18d48ac1f46b600e231da07d1da8209ceef",
                "topics": [
                    "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                    "0x0000000000000000000000000000000000000000000000000000000000000000",
                    "0x000000000000000000000000026b37a09af3ceb346c39999c5738f86a1a48f4d",
                    "0x000000000000000000000000000000000000000000000000000000000000007f"
                ],
                "data": "0x",
                "blockHash": "0x638a175940cacb33f35e265961b164b14aa77477438340e635b227752f31981f",
                "blockNumber": "0x25ce471",
                "transactionHash": "0xc3e64ac247ae2343335596e106d1b97e35637656e1b99b37977a4165b34aeeb4",
                "transactionIndex": "0x44",
                "logIndex": "0x12e",
                "removed": false
            },
        ],
        "status": "0x1",
        "logsBloom": "0x000000000000000000000000000000000008000000000000000000000000000000080000000000000002001108040020001080000000000000000200004000000000000000000000000800080000008000000000000000000001000208400040000000000a0008000000000000000800000000000000004080800010020100040000000000000000100000000000010000000000200080000000000000000000210000000000000000400080000000000000000000000000108002000004004008000002000000000001001000800000000001000000800000148040020020000000000000000000000001000000000100000000000000000000002000100000",
        "type": "0x2",
        "effectiveGasPrice": "0x59682f2e"
    }
}

supportedEntryPoints

Returns an array of the entryPoint addresses supported by the client. The first element of the array SHOULD be the entryPoint addressed preferred by the client.

Parameters

• None

Returns

• an array of the entryPoint addresses supported by the client. The first element of the array SHOULD be the entryPoint addressed preferred by the client.

Example

web3.EIP4337.supportedEntryPoints().then(console.log);
> ["0xcd01C8aa8995A59eB7B2627E69b40e0524B5ecf8", "0x7A0A0d159218E6a2f407B99173A2b12A6DDfC2a6"]

generateUserOpHash

calculate UserOperationHash

Parameters

• userOp - a structure that describes a transaction to be sent on behalf of a user.

• entryPoint - a singleton contract to execute bundles of UserOperations. Bundlers/Clients whitelist the supported entrypoint.

Returns

• An array of the entryPoint addresses supported by the client. The first element of the array SHOULD be the entryPoint addressed preferred by the client.

Example

web3.EIP4337.generateUserOpHash({
    sender: "0x9fd042a18e90ce326073fa70f111dc9d798d9a52",
    nonce: "123",
    initCode: "0x68656c6c6f",
    callData: "0x776F726C64",
    callGasLimit: "1000",
    verificationGasLimit: "2300",
    preVerificationGas: "3100",
    maxFeePerGas: "0",
    maxPriorityFeePerGas: "0",
    paymasterAndData: "0x626c6f63746f",
    signature: "0x636c656d656e74"
},"0x636c656d656e74", '0x1').then(console.log);
> 0xxxx

Run the tests

1. Clone the repo
2. Run yarn to install dependencies

• If you receive the following warning, please remove the file package-lock.json and make sure to run yarn to install dependencies instead of npm i:

warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.

3. Run the tests:

• yarn test:unit: Runs the mocked tests that do not make a network request using the Jest framework
• End-to-end tests: Runs Webpack bundled tests that make a network request to the RPC provider https://rpc.ankr.com/eth and returns an actual response from MainnetPriceFeeds.LinkEth smart contract using the Cypress framework
• yarn test:e2e:chrome: Runs the tests using Chrome
• yarn test:e2e:electron: Runs the tests using Electron
• yarn test:e2e:firefox: Runs the tests using Firefox
• Black box tests: Uses a published version of the plugin from Verdaccio to run tests that make a network request to the RPC provider https://rpc.ankr.com/eth and returns an actual response from MainnetPriceFeeds.LinkEth smart contract using the Jest framework
• NOTE The black box tests are setup to run within Github actions environment, but can be ran locally. The black_box_test_helpers.sh script can be used to:
• start: Start Verdaccio using a Docker container
• stop: Kill the Docker container
• startBackgroundAndPublish: Starts a headless Docker container and publishes the plugin package
• runTests: cds into the test/black_box directory, installs the black box package dependencies, and runs yarn test which will use Jest to run the tests
• In addition to the black_box_test_helpers.sh script, the black box tests can be ran using the following package.json scripts:

1. yarn pre-black-box: Calls startBackgroundAndPublish from the black_box_test_helpers.sh script
2. yarn test:black-box: Calls yarn pre-black-box and runTests from the from the black_box_test_helpers.sh script
3. yarn post-black-box: Calls stop from the black_box_test_helpers.sh script

License

MIT