Signing

import * as nacl from 'tweetnacl';
import { Keypair } from '@solana/web3.js';

const TOS = "By signing, I hereby agree to Vanish's Terms of Service and agree to be bound by them (docs.vanish.trade/legal/TOS)";

function signMessage(details: string, keypair: Keypair): string {
  const message = [TOS, "", `Details: ${details}`].join('\n');
  const sig = nacl.sign.detached(new TextEncoder().encode(message), keypair.secretKey);
  return Buffer.from(sig).toString('base64');
}

// milliseconds, not seconds
const timestamp = Date.now().toString();

signMessage(`read:${timestamp}`, keypair);
signMessage(`trade:${source}:${target}:${amount}:${loanSol}:${timestamp}:${jitoTip}`, keypair);
signMessage(`withdraw:${token}:${amount}:${additionalSol}:${timestamp}`, keypair);
signMessage(`borrow-smart-wallet:${protocolLabel}:${timestamp}`, keypair);
signMessage(`borrow:${smartWalletId}:${source}:${amount}:${loanSol}:${timestamp}:${jitoTip}`, keypair);
signMessage(`settle:${smartWalletId}:${token}:${amount}:${loanSol}:${cleanup}:${timestamp}`, keypair);

use solana_sdk::signature::{Keypair, Signer};
use base64::{engine::general_purpose, Engine as _};

const TOS: &str = "By signing, I hereby agree to Vanish's Terms of Service and agree to be bound by them (docs.vanish.trade/legal/TOS)";

fn sign_message(details: &str, keypair: &Keypair) -> String {
    let message = format!("{TOS}\n\nDetails: {details}");
    let sig = keypair.sign_message(message.as_bytes());
    general_purpose::STANDARD.encode(sig.as_ref())
}

// milliseconds, not seconds
let timestamp = chrono::Utc::now().timestamp_millis().to_string();

sign_message(&format!("read:{timestamp}"), &keypair);
sign_message(&format!("trade:{source}:{target}:{amount}:{loan_sol}:{timestamp}:{jito_tip}"), &keypair);
sign_message(&format!("withdraw:{token}:{amount}:{additional_sol}:{timestamp}"), &keypair);
sign_message(&format!("borrow-smart-wallet:{protocol_label}:{timestamp}"), &keypair);
sign_message(&format!("borrow:{smart_wallet_id}:{source}:{amount}:{loan_sol}:{timestamp}:{jito_tip}"), &keypair);
sign_message(&format!("settle:{smart_wallet_id}:{token}:{amount}:{loan_sol}:{cleanup}:{timestamp}"), &keypair);