Generating A Signature For Farcaster Signer in Swift

signer.swift

import web3 //https://github.com/argentlabs/web3.swift

private func generateSignature() {
    let privateKey = "0xd5071223dcbf1cb824090bd98e0ddc807be00f1874fdd74bbd9225773a824397" // PrivateKey of your wallet must be matched with FID. Note: Store it in a safe place
    let requestFid: Double = 232312
    let deadline = Double(Date().timeIntervalSince1970) + 86400
    let publicKey = "0x85d2c4199a7fae484739ec9d280b28e5214a343298049745c108942690574a8e"
    
    // Start | Domain SignedKeyRequest | Don't change this value
    let name = "Farcaster SignedKeyRequestValidator"
    let version = "1"
    let chainId: Double = 10
    let verifyingContract = "0x00000000fc700472606ed4fa22623acf62c60553"
    // End
    
    let keyStorage = EthereumKeyLocalStorage()
    let account = try! EthereumAccount.importAccount(
      replacing: keyStorage,
      privateKey: privateKey,
      keystorePassword: "MY_PASSWORD")
        
    let typedData = TypedData(
      types: [
        "EIP712Domain": [
          .init(name: "name", type: "string"),
          .init(name: "version", type: "string"),
          .init(name: "chainId", type: "uint256"),
          .init(name: "verifyingContract", type: "address")
        ],
        "SignedKeyRequest": [
          .init(name: "requestFid", type: "uint256"),
          .init(name: "key", type: "bytes"),
          .init(name: "deadline", type: "uint256")
        ]
      ],
      primaryType: "SignedKeyRequest",
      domain: .object([
        "name" : .string(name),
        "version" : .string(version),
        "chainId" : .number(chainId),
        "verifyingContract" : .string(verifyingContract),
      ]),
      message: .object([
        "requestFid": .number(requestFid),
        "key": .string(publicKey),
        "deadline": .number(deadline)
      ]))
        
    let signedKey = try! account.signMessage(message: typedData)
    print("|DEBUG| Signer: \(signedKey)")
  }