exchange.IO("signTypedData", ...)

按照EIP-712标准对结构化数据进行签名，一次调用即可完成类型哈希、域分隔符、结构体哈希和摘要的计算并签名，适用于ERC-20 Permit、Permit2、UniswapX、CoW、1inch限价单等场景。

    
    
    
exchange.IO(k, typedData)

    
    
    
exchange.IO(k, typedData, key)

    
    
    
exchange.IO(k, domain, types, message)

    
    
    
exchange.IO(k, domain, types, message, key)

示例

对以太坊主网USDC的Permit进行签名，并通过exchange.IO("call", ...)由USDC合约验证签名。

    javascript
    
    
function main() {
    var USDC = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"      // 以太坊主网 USDC
    var spender = "0x1111111254EEB25477B68fb85Ed929f73A960582"   // 被授权方，按实际填写
    var owner = exchange.IO("address")
    var deadline = Math.floor(Date.now() / 1000) + 3600
    // nonce 必须等于合约里的 nonces(owner)：钱包用过一次 permit 后就不再是 0
    exchange.IO("abi", USDC, JSON.stringify([{ type: "function", name: "nonces",
        stateMutability: "view",
        inputs: [{ type: "address" }], outputs: [{ type: "uint256" }] }]))
    var nonce = exchange.IO("api", USDC, "nonces", owner)

    // ethers 写法：domain、types（不含 EIP712Domain）、message，主类型自动推断
    var domain = { name: "USD Coin", version: "2", chainId: 1, verifyingContract: USDC }
    var types = {
        Permit: [
            { name: "owner", type: "address" }, { name: "spender", type: "address" },
            { name: "value", type: "uint256" }, { name: "nonce", type: "uint256" },
            { name: "deadline", type: "uint256" }
        ]
    }
    var message = { owner: owner, spender: spender, value: "1000000", nonce: nonce,
        deadline: deadline }
    var sig = exchange.IO("signTypedData", domain, types, message)
    Log("digest:", sig.digest, "v:", sig.v, "r:", sig.r, "s:", sig.s)

    // 单对象写法（MetaMask eth_signTypedData_v4 的格式）结果相同
    var sig2 = exchange.IO("signTypedData", { domain: domain, types: types, primaryType: "Permit",
        message: message })
    Log("两种写法一致:", sig.signature === sig2.signature)

    // 用 eth_call 模拟 USDC 的 permit，由合约验证签名（不发送交易）
    var calldata = "0x" + String(exchange.IO("hash", "keccak256", "raw", "hex",
        "permit(address,address,uint256,uint256,uint8,bytes32,bytes32)")).replace(/^0x/, "").slice(0, 8) +
        exchange.IO("encode", "address,address,uint256,uint256,uint8,bytes32,bytes32",
            owner, spender, "1000000", deadline, sig.v, sig.r, sig.s)
    Log("permit 模拟:", exchange.IO("call", USDC, calldata) !== null ? "签名有效" : GetLastError())
}

返回值

参数

参考

备注

message中缺少类型定义中的字段时会报错，不会将缺失字段补零后签名。

私钥仅在交易所对象内部使用，策略代码无法获取私钥。