Metamask: MetaMask - RPC Error: The requested account and/or method has not been authorized by the user - F.I.S.A.R. A.P.S.

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RPC Error: The requested account and/or method has not been authorized by the user

When implementing one-click login flows with MetaMask, it is crucial to ensure that your users are properly authenticated before proceeding. Unfortunately, a common issue arises when the user is prompted to authorize access to their Metamask wallet. This error message is displayed when the request fails due to a lack of authorization from the user.

Understanding RPC Errors

RPC (Remote Procedure Call) errors occur when an application fails to communicate with its underlying systems or services. In this case, it seems that MetaMask is unable to authenticate your app’s requests due to insufficient permissions.

The Issue: Unauthorized Account and Method

When a user initiates the login flow for your app using MetaMask, you need to request access to their wallet and account information. However, if the user does not authorize these requests, your app will be unable to proceed.

To illustrate this issue, let’s revisit the example provided in the tutorial on One-click Login Flows with MetaMask:

const metamask = window.ethereum;
if (!metamask && !metamask.isMetaMask) {
  console.log('User is not authenticated or has not authorized app to access their wallet.');
} else if ( metamask && metamask accounts . length === 0 ) {
  console.log('No MetaMask account was found. Please link your wallet and authorize the app.');
} else {
  // Proceed with login
} }

The Solution: Checking Account and Method Authorization

To resolve this issue, you need to check if the requested account and method have been authorized by the user. Here’s an updated example:

const metamask = window.ethereum;
if (!metamask && !metamask.isMetaMask) {
  console.log('User is not authenticated or has not authorized app to access their wallet.');
} else if ( metamask && metamask . accounts . length > 0 ) {
  const accounts = metamask.accounts;
  const method = window.web3.eth.createAccount;
  for ( const account of accounts ) {
    try {
      await method ( account ) ;
      // Proceed with login
      break;
    } catch (error) {
      console.log(Error accessing wallet: ${error});
    } }
  } }
} else if ( ! metamask && metamask . isMetaMask ) {
  const accounts = metamask.accounts;
  for ( const account of accounts ) {
    try {
      await method ( account ) ;
      // Proceed with login
      break;
    } catch (error) {
      console.log(Error accessing wallet: ${error});
    } }
  } }
} else if ( metamask && metamask . accounts . length === 0 ) {
  console.log('No MetaMask account was found. Please link your wallet and authorize the app.');
} }

Best Practices

To avoid this issue in the future, consider implementing additional security measures:

• Always check for authorization before proceeding with user authentication.

• Use metamask accounts.length > 0 instead of directly accessing the accounts array to ensure only authorized accounts are accessed.

• Log any errors that occur during wallet access to help diagnose issues.

By following these guidelines, you can implement robust one-click login flows with MetaMask and minimize RPC errors.

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