Web3 Encoding – Is There a Way to Get the Result of Web3’s encodeFunctionCall with Ethers?

ethers.js

I'm using web3 to get the RLP encoded data for a function call like so

const safeTransferFrom: any = tokenERC1155Abi.find((f) => f.name === 'safeTransferFrom');
const params: Array<any> = [identity, minterAddr, 1, amount, '0x0'];
web3.eth.abi.encodeFunctionCall(safeTransferFrom, params);

is there a way to achieve the same result with the ethers.js library?

Best Answer

The equivalent in ethers.js involves first creating an "interface" object and calling a method on that:

> let ABI = [ "function transfer(address to, uint amount)" ];
> let iface = new ethers.utils.Interface(ABI);
> iface.encodeFunctionData("transfer", [ <function_params> ])

Taken from here

Related Solutions

Ethers.js – How to Decode Input Data in Ethers.js

You need the input types as well to be able to decode it.

const data = '0x7ff36ab50000000000000000000000000000000000000000000000bc18ba4144048bbab00000000000000000000000000000000000000000000000000000000000000080000000000000000000000000c0c5eb43e2df059e3be6e4fb0284c283caa5991900000000000000000000000000000000000000000000000000000000614d87a80000000000000000000000000000000000000000000000000000000000000002000000000000000000000000bb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c00000000000000000000000008ba0619b1e7a582e0bce5bbe9843322c954c340';

ethers.utils.defaultAbiCoder.decode(
  ['uint256', 'address[]', 'address', 'uint256'],
  ethers.utils.hexDataSlice(data, 4)
)
// gives: [e, ["0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c", "0x08ba0619b1e7A582E0BCe5BBE9843322C954C340"], "0xC0C5eb43E2dF059e3Be6E4fb0284C283CAa59919", e] (4)

If plugging in the ABI is more convenient for you then you can use interface:

const iface = new ethers.utils.Interface(['function swapExactETHForTokens(uint256 amountOutMin, address[] path, address to, uint256 deadline)'])

iface.decodeFunctionData('swapExactETHForTokens', '0x7ff36ab50000000000000000000000000000000000000000000000bc18ba4144048bbab00000000000000000000000000000000000000000000000000000000000000080000000000000000000000000c0c5eb43e2df059e3be6e4fb0284c283caa5991900000000000000000000000000000000000000000000000000000000614d87a80000000000000000000000000000000000000000000000000000000000000002000000000000000000000000bb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c00000000000000000000000008ba0619b1e7a582e0bce5bbe9843322c954c340')
// gives: [e, ["0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c", "0x08ba0619b1e7A582E0BCe5BBE9843322C954C340"], "0xC0C5eb43E2dF059e3Be6E4fb0284C283CAa59919", e] (4)

Solidity – How to Get Interface ID of Solidity Interface Using Ethers.js?

Currently there is not. You have to xor all function selectors of IMyContract.

To make your life easier, you can use ethers.js interface and use its getSighash functions to not have to hash it and slice it ourself. But still you have to xor these selectors to get an interfaceId.

Best Answer

Related Solutions

Ethers.js – How to Decode Input Data in Ethers.js

Solidity – How to Get Interface ID of Solidity Interface Using Ethers.js?

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