Utilities - ZKsyncDocs

Web3Utils extension

Address modulo

Used for applying and undoing alias.

static let ADDRESS_MODULO = BigUInt(2).power(160)

L1 to L2 alias offset

Used for applying and undoing aliases on addresses during bridging from L1 to L2.

static let L1_TO_L2_ALIAS_OFFSET = "0x1111000000000000000000000000000000001111"

L1 fee estimation numerator

Used to when scaling gas limit for l1 transactions

IERC20

For interacting with native tokens.

let IERC20 = Web3Utils.IERC20

ZKsync Era main contract

let iZkSync = Web3.Utils.IZkSync

L1 messenger

Used for sending messages from ZKsync Era to Ethereum.

let IL1Messenger = Web3.Utils.IL1Messenger

L1 and L2 bridges

Bridge interface ABIs for L1 and L2.

let IL1Bridge = Web3.Utils.IL1Bridge
let IL2Bridge = Web3.Utils.IL2Bridge

`applyL1ToL2Alias`

Converts the address that submitted a transaction to the inbox on L1 to the msg.sender viewed on L2.

Returns the msg.sender of the L1->L2 transaction as the address of the contract that initiated the transaction.

More info

During a normal transaction, if contract A calls contract B, the msg.sender is A.
During L1->L2 communication, if an EOA X calls contract B, the msg.sender is X.
During L1->L2 communication, if a contract A calls contract B, the msg.sender is applyL1ToL2Alias(A).

Inputs

Parameter	Type	Description
`address`	String	Contract address.

Example

print(Web3Utils.applyL1ToL2Alias(address: "0x702942B8205E5dEdCD3374E5f4419843adA76Eeb"))
// l2ContractAddress = "0x813A42B8205E5DedCd3374e5f4419843ADa77FFC"

`scaleGasLimit`

Inputs

Parameter	Type	Description
`gas`	BigUInt	Gas to scale.

Example

BigUInt = BigUInt(100_000)
BigUInt gasLimit = Web3Utils.scaleGasLimit(gas: baseLimit)

`TransactionType`

EIP712 transaction type

Constant representing an EIP712 transaction type.

case eip712 = 0x71

EIP712 structures

Collection of EIP712 structures with their types.

public func eip712types() -> [EIP712.`Type`] {
        return [
            ("txType", EIP712.UInt256(type.rawValue)),
            ("from", BigUInt(from!.addressData)),
            ("to", BigUInt(to.addressData)),
            ("gasLimit", gasLimit),
            ("gasPerPubdataByteLimit", eip712Meta?.gasPerPubdata as Any),
            ("maxFeePerGas", maxFeePerGas as Any),
            ("maxPriorityFeePerGas", maxPriorityFeePerGas as Any),
            ("paymaster", BigUInt(eip712Meta?.paymasterParams?.paymaster?.addressData ?? Data())),
            ("nonce", nonce),
            ("value", value as Any),
            ("data", data),
            ("factoryDeps", eip712Meta?.factoryDeps ?? []),
            ("paymasterInput", eip712Meta?.paymasterParams?.paymasterInput ?? Data())
        ]
    }

`ZkSyncAddresses`

ETH token layer 1

public static let EthAddress = "0x0000000000000000000000000000000000000000"

Contract deployer

public static let ContractDeployerAddress = "0x0000000000000000000000000000000000008006"

L1 messenger

public static let MessengerAddress = "0x0000000000000000000000000000000000008008"

Nonce holder

public static let NonceHolderAddress = "0x0000000000000000000000000000000000008003"

`EthereumAddress` extension

ETH token alias on ZkSync Era

static let L2EthTokenAddress = EthereumAddress("0x000000000000000000000000000000000000800a")!

ETH token layer 1

static let Default = EthereumAddress("0x0000000000000000000000000000000000000000")!

`computeL2Create2Address`

Generates a future-proof contract address using salt plus bytecode which allows determination of an address before deployment.

The ZKsync Era implementation is slightly different from Ethereum.

Inputs

Parameter	Type	Description
`sender`	`EthereumAddress`	Sender address.
`bytecode`	`Data`	Output from zkSolc.
`constructor`	`Data`	ABI encoded constructor arguments.
`salt`	`Data`	Randomization element.

Example

let result = ContractDeployer.computeL2Create2Address(EthereumAddress("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049")!,
                                                      bytecode: Data(hex: "0x010001cb6a6e8d5f6829522f19fa9568660e0a9cd53b2e8be4deb0a679452e41"),
                                                      constructor: Data(),
                                                      salt: Data())

`computeL2CreateAddress`

Generates a contract address from deployer's account and nonce.

Inputs

Parameter	Type	Description
`sender`	`EthereumAddress`	Sender address.
`nonce`	`BigUInt`	Sender nonce.

Example

let result = ContractDeployer.computeL2CreateAddress(EthereumAddress("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049")!, nonce: BigUInt(1))

`estimateDefaultBridgeDepositL2Gas`

Returns an estimation of L2 gas required for token bridging via the default ERC20 bridge.

Inputs

Parameter	Type	Description
`providerL1`	`Web3`	Ethers provider.
`providerL2`	`ZkSyncClient`	ZkSync provider.
`token`	`EthereumAddress`	Token address.
`amount`	`BigUInt`	Deposit amount.
`to`	`Address`	Recipient address.
`from`	`EthereumAddress`	Sender address.
`gasPerPubdataByte`	`BigNumberish`	Current gas per byte of pubdata, deffault 800 (optional).

`getERC20DefaultBridgeData`

Returns the calldata sent by an L1 ERC20 bridge to its L2 counterpart during token-bridging.

Inputs

Parameter	Type	Description
`l1TokenAddress`	`String`	Token address on L1.
`provider`	`Web3`	Provider.

`verifySignature`

Returns: true on verification success.

Inputs

Parameter	Type	Description
`signature`	`String`	Signature of the EIP-712 structures.
`message`	`Data`	Message to verify.
`prefixed`	`Bool`	If `true` then add secure prefix EIP-712.

`verifyTypedData`

Returns: true on verification success.

Inputs

Parameter	Type	Description
`domain`	`EIP712Domain`	EIP712 domain.
`typedData`	`S`	Object implementing EIP712 structure standard.
`signature`	`String`	Signature of the EIP-712 structures.

Contracts

Paymaster Utilities