chore: simplify eip712 example (#492)
* chore(contract): gate eip712 * examples: simplify permit hash * chore: fmt
This commit is contained in:
Georgios Konstantopoulos
GitHub
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d7ab229a4c
commit
0c94b58cd5
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@ -81,7 +81,7 @@ ethers-signers = { version = "^0.5.0", default-features = false, path = "./ether
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ethers-middleware = { version = "^0.5.0", default-features = false, path = "./ethers-middleware" }
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[dev-dependencies]
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ethers-contract = { version = "^0.5.0", default-features = false, path = "./ethers-contract", features = ["abigen"] }
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ethers-contract = { version = "^0.5.0", default-features = false, path = "./ethers-contract", features = ["abigen", "eip712"] }
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ethers-providers = { version = "^0.5.0", default-features = false, path = "./ethers-providers", features = ["ws", "ipc"] }
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anyhow = "1.0.39"
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@ -90,4 +90,4 @@ serde = { version = "1.0.124", features = ["derive"] }
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serde_json = "1.0.64"
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tokio = { version = "1.5", features = ["macros", "rt-multi-thread"] }
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hex = "0.4.3"
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bytes = "1.1.0"
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bytes = "1.1.0"
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@ -11,9 +11,10 @@ keywords = ["ethereum", "web3", "celo", "ethers"]
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[dependencies]
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ethers-providers = { version = "^0.5.0", path = "../ethers-providers", default-features = false }
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ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false, features = ["eip712"]}
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ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false }
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ethers-contract-abigen = { version = "^0.5.0", path = "ethers-contract-abigen", optional = true }
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ethers-contract-derive = { version = "^0.5.0", path = "ethers-contract-derive", optional = true }
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ethers-derive-eip712 = { version = "0.1.0", path = "../ethers-core/ethers-derive-eip712", optional = true }
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serde = { version = "1.0.124", default-features = false }
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serde_json = { version = "1.0.64", default-features = false }
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@ -29,12 +30,14 @@ ethers-providers = { version = "^0.5.0", path = "../ethers-providers", default-f
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ethers-signers = { version = "^0.5.0", path = "../ethers-signers" }
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ethers-contract-abigen = { version = "^0.5.0", path = "ethers-contract-abigen" }
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ethers-contract-derive = { version = "^0.5.0", path = "ethers-contract-derive" }
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ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false, features = ["eip712"]}
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ethers-derive-eip712 = { version = "0.1.0", path = "../ethers-core/ethers-derive-eip712"}
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[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
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tokio = { version = "1.5", default-features = false, features = ["macros"] }
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[features]
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eip712 = ["ethers-derive-eip712", "ethers-core/eip712"]
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abigen = ["ethers-contract-abigen", "ethers-contract-derive"]
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celo = ["legacy", "ethers-core/celo", "ethers-core/celo", "ethers-providers/celo"]
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legacy = []
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@ -1,94 +1,36 @@
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use ethers::{
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abi,
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abi::Token,
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prelude::U256,
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types::Address,
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utils,
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utils::{keccak256, parse_ether},
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contract::Eip712,
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contract::EthAbiType,
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core::types::transaction::eip712::Eip712,
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types::{Address, U256},
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};
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const UNISWAP_V2_USDC_ETH_PAIR: &'static str = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc";
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// Generate the EIP712 permit hash to sign for a Uniswap V2 pair.
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// https://eips.ethereum.org/EIPS/eip-712
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// https://eips.ethereum.org/EIPS/eip-2612
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fn main() {
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// Test data
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let owner: Address = "0x617072Cb2a1897192A9d301AC53fC541d35c4d9D"
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.parse()
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.unwrap();
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let spender: Address = "0x2819c144D5946404C0516B6f817a960dB37D4929"
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.parse()
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.unwrap();
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let value = parse_ether(10).unwrap();
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let nonce = U256::from(1);
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let deadline = U256::from(3133728498 as u32);
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let verifying_contract: Address = UNISWAP_V2_USDC_ETH_PAIR.parse().unwrap();
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let name = "Uniswap V2";
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let version = "1";
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let chainid = 1;
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// Typehash for the permit() function
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let permit_typehash = utils::keccak256(
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"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)",
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);
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// Typehash for the struct used to generate the domain separator
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let domain_typehash = keccak256(
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"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)",
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);
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// Corresponds to solidity's abi.encode()
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let domain_separator_input = abi::encode(&vec![
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Token::Uint(U256::from(domain_typehash)),
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Token::Uint(U256::from(keccak256(&name))),
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Token::Uint(U256::from(keccak256(&version))),
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Token::Uint(U256::from(chainid)),
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Token::Address(verifying_contract),
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]);
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// Corresponds to the following solidity:
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// DOMAIN_SEPARATOR = keccak256(
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// abi.encode(
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// keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
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// keccak256(bytes(name)),
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// keccak256(bytes('1')),
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// chainId,
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// address(this)
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// )
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// );
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let domain_separator = keccak256(&domain_separator_input);
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// Corresponds to solidity's abi.encode()
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let struct_input = abi::encode(&vec![
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Token::Uint(U256::from(permit_typehash)),
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Token::Address(owner),
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Token::Address(spender),
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Token::Uint(value),
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Token::Uint(nonce),
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Token::Uint(deadline),
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]);
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let struct_hash = keccak256(&struct_input);
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// Corresponds to solidity's abi.encodePacked()
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let digest_input = [
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&[0x19, 0x01],
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domain_separator.as_ref(),
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struct_hash.as_ref(),
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]
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.concat();
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// Matches the following solidity:
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// bytes32 digest = keccak256(
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// abi.encodePacked(
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// '\x19\x01',
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// DOMAIN_SEPARATOR,
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// keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
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// )
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// );
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let permit_hash = keccak256(&digest_input);
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assert_eq!(
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hex::encode(permit_hash),
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"7b90248477de48c0b971e0af8951a55974733455191480e1e117c86cc2a6cd03"
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);
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#[derive(Eip712, EthAbiType, Clone)]
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#[eip712(
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name = "Uniswap V2",
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version = "1",
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chain_id = 1,
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verifying_contract = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc"
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)]
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struct Permit {
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owner: Address,
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spender: Address,
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value: U256,
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nonce: U256,
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deadline: U256,
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}
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fn main() {
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let permit = Permit {
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owner: Address::random(),
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spender: Address::random(),
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value: 100.into(),
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nonce: 0.into(),
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deadline: U256::MAX,
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};
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let permit_hash = permit.encode_eip712().unwrap();
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println!("Permit hash: 0x{}", hex::encode(permit_hash));
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}
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