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chore: simplify eip712 example (#492) 

* chore(contract): gate eip712

* examples: simplify permit hash

* chore: fmt
This commit is contained in:
Georgios Konstantopoulos 2021-10-08 17:31:42 +01:00 committed by GitHub
parent d7ab229a4c
commit 0c94b58cd5
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3 changed files with 35 additions and 90 deletions
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2
Cargo.toml
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@ -81,7 +81,7 @@ ethers-signers = { version = "^0.5.0", default-features = false, path = "./ether
ethers-middleware = { version = "^0.5.0", default-features = false, path = "./ethers-middleware" }
[dev-dependencies]
ethers-contract = { version = "^0.5.0", default-features = false, path = "./ethers-contract", features = ["abigen"] }
ethers-contract = { version = "^0.5.0", default-features = false, path = "./ethers-contract", features = ["abigen", "eip712"] }
ethers-providers = { version = "^0.5.0", default-features = false, path = "./ethers-providers", features = ["ws", "ipc"] }
anyhow = "1.0.39"

5
ethers-contract/Cargo.toml
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@ -11,9 +11,10 @@ keywords = ["ethereum", "web3", "celo", "ethers"]
[dependencies]
ethers-providers = { version = "^0.5.0", path = "../ethers-providers", default-features = false }
ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false, features = ["eip712"]}
ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false }
ethers-contract-abigen = { version = "^0.5.0", path = "ethers-contract-abigen", optional = true }
ethers-contract-derive = { version = "^0.5.0", path = "ethers-contract-derive", optional = true }
ethers-derive-eip712 = { version = "0.1.0", path = "../ethers-core/ethers-derive-eip712", optional = true }
serde = { version = "1.0.124", default-features = false }
serde_json = { version = "1.0.64", default-features = false }
@ -29,12 +30,14 @@ ethers-providers = { version = "^0.5.0", path = "../ethers-providers", default-f
ethers-signers = { version = "^0.5.0", path = "../ethers-signers" }
ethers-contract-abigen = { version = "^0.5.0", path = "ethers-contract-abigen" }
ethers-contract-derive = { version = "^0.5.0", path = "ethers-contract-derive" }
ethers-core = { version = "^0.5.0", path = "../ethers-core", default-features = false, features = ["eip712"]}
ethers-derive-eip712 = { version = "0.1.0", path = "../ethers-core/ethers-derive-eip712"}
[target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
tokio = { version = "1.5", default-features = false, features = ["macros"] }
[features]
eip712 = ["ethers-derive-eip712", "ethers-core/eip712"]
abigen = ["ethers-contract-abigen", "ethers-contract-derive"]
celo = ["legacy", "ethers-core/celo", "ethers-core/celo", "ethers-providers/celo"]
legacy = []

116
examples/permit_hash.rs
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@ -1,94 +1,36 @@
use ethers::{
abi,
abi::Token,
prelude::U256,
types::Address,
utils,
utils::{keccak256, parse_ether},
contract::Eip712,
contract::EthAbiType,
core::types::transaction::eip712::Eip712,
types::{Address, U256},
};
const UNISWAP_V2_USDC_ETH_PAIR: &'static str = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc";
// Generate the EIP712 permit hash to sign for a Uniswap V2 pair.
// https://eips.ethereum.org/EIPS/eip-712
// https://eips.ethereum.org/EIPS/eip-2612
fn main() {
// Test data
let owner: Address = "0x617072Cb2a1897192A9d301AC53fC541d35c4d9D"
.parse()
.unwrap();
let spender: Address = "0x2819c144D5946404C0516B6f817a960dB37D4929"
.parse()
.unwrap();
let value = parse_ether(10).unwrap();
let nonce = U256::from(1);
let deadline = U256::from(3133728498 as u32);
let verifying_contract: Address = UNISWAP_V2_USDC_ETH_PAIR.parse().unwrap();
let name = "Uniswap V2";
let version = "1";
let chainid = 1;
// Typehash for the permit() function
let permit_typehash = utils::keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)",
);
// Typehash for the struct used to generate the domain separator
let domain_typehash = keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)",
);
// Corresponds to solidity's abi.encode()
let domain_separator_input = abi::encode(&vec![
Token::Uint(U256::from(domain_typehash)),
Token::Uint(U256::from(keccak256(&name))),
Token::Uint(U256::from(keccak256(&version))),
Token::Uint(U256::from(chainid)),
Token::Address(verifying_contract),
]);
// Corresponds to the following solidity:
// DOMAIN_SEPARATOR = keccak256(
// abi.encode(
// keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
// keccak256(bytes(name)),
// keccak256(bytes('1')),
// chainId,
// address(this)
// )
// );
let domain_separator = keccak256(&domain_separator_input);
// Corresponds to solidity's abi.encode()
let struct_input = abi::encode(&vec![
Token::Uint(U256::from(permit_typehash)),
Token::Address(owner),
Token::Address(spender),
Token::Uint(value),
Token::Uint(nonce),
Token::Uint(deadline),
]);
let struct_hash = keccak256(&struct_input);
// Corresponds to solidity's abi.encodePacked()
let digest_input = [
&[0x19, 0x01],
domain_separator.as_ref(),
struct_hash.as_ref(),
]
.concat();
// Matches the following solidity:
// bytes32 digest = keccak256(
// abi.encodePacked(
// '\x19\x01',
// DOMAIN_SEPARATOR,
// keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
// )
// );
let permit_hash = keccak256(&digest_input);
assert_eq!(
hex::encode(permit_hash),
"7b90248477de48c0b971e0af8951a55974733455191480e1e117c86cc2a6cd03"
);
#[derive(Eip712, EthAbiType, Clone)]
#[eip712(
name = "Uniswap V2",
version = "1",
chain_id = 1,
verifying_contract = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc"
)]
struct Permit {
owner: Address,
spender: Address,
value: U256,
nonce: U256,
deadline: U256,
}
fn main() {
let permit = Permit {
owner: Address::random(),
spender: Address::random(),
value: 100.into(),
nonce: 0.into(),
deadline: U256::MAX,
};
let permit_hash = permit.encode_eip712().unwrap();
println!("Permit hash: 0x{}", hex::encode(permit_hash));
}