VentureWise/success.html at main · meetmistry27/VentureWise · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <title>Ethers.js Sign Message Example</title>
    <script src="https://cdn.ethers.io/lib/ethers-5.7.1.umd.min.js"
        type="application/javascript"></script>
    <style>
      body {
        font-family: Arial, sans-serif;
        text-align: center;
      }

      h1 {
        margin-bottom: 20px;
      }

      p {
			text-align: center;
			font-size: 20px;
			margin-top: 50px;
		}

      button {
        padding: 10px 20px;
        border: none;
        border-radius: 5px;
        background-color: #3f51b5;
        color: #fff;
        font-size: 16px;
        cursor: pointer;
      }

      button:hover {
        background-color: #1c2b46;
      }
    </style>
  </head>
  <body>
    <h1>Ethers.js Sign Message Example</h1>
    <button onclick="signMessage()">Sign Message</button>
    <p id="p1"></p>
    <script>
      // Get the nonce value from the backend server
      async function getNonce() {
        const response = await fetch('/api/nonce');
        const data = await response.json();
        return data.nonce;
      }

      // Sign the message with the nonce and send it to the backend server for verification
      async function signMessage() {

        try {
          var element = document.getElementById("p1");
          let stored = window.localStorage.getItem("token")
          console.log(stored)
        if (window.localStorage.getItem("token") != null ) {
            let token = window.localStorage.getItem("token");
            const response = await fetch('/verify', {
                method: 'POST',
                headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${token}`
            }
        });

        let newresponse = await response.json();
        console.log(newresponse);

        if (newresponse == "ok") {
            window.location.href = '/success';
        }
        else {
            window.localStorage.removeItem("token");
            element.innerHTML = "Token Expired, log in again to get a new Token !!!"
        }
    }

    else {
            // Get the nonce value from the backend server
          const nonce = await getNonce();
          // Get the signer account using MetaMask
          const provider = new ethers.providers.Web3Provider(window.ethereum);
          const signer = provider.getSigner();
          const address = await signer.getAddress();
          // Sign the message using the signer account and the nonce value
          const message = `I am signing this message to prove my identity. Nonce: ${nonce}`;
          const signedMessage = await signer.signMessage(message);
          const data = { signedMessage, message, address };
          // Send the signed message and the public address of the signer to the backend server for verification
          const response = await fetch('/login', {
            method: 'POST',
            headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
          });

        let token = await response.json();
        window.localStorage.setItem("token", token);
        const newResponse = await fetch('/verify', {
                method: 'POST',
                headers: {
                'Content-Type': 'application/json',
                'Authorization': `Bearer ${token}`
            }
        });
        let answer = await newResponse.json();
        console.log(answer)
        if (answer == "ok") {
            window.location.href = '/success';
        }

        else {
            var element = document.getElementById("p1");
            element.innerHTML = "Invalid Token !!!"
        }
        }

        } catch (error) {
          console.error(error);
        }
      }
    </script>
  </body>
</html>