RPC Error: User has not authorized the requested account and/or method
When implementing one-click login flows with MetaMask, it is very important to ensure that the user is properly authenticated before proceeding. Unfortunately, a common issue occurs when a user is asked to authorize access to their MetaMask wallet. This error message appears when a request fails due to the user not being authorized.
Understanding RPC Errors
Remote Procedure Call (RPC) errors occur when an application is unable to communicate with the underlying systems or services. In this case, it appears that MetaMask is unable to authenticate your application’s requests due to insufficient authorizations.
Issue: Account and Method Not Authorized
When a user initiates the login flow to your app using MetaMask, you must request access to their wallet and account information. However, if the user does not accept these requests, your application will not be able to proceed.
To illustrate this problem, let’s look at the example provided in the One-Click Login Flows with MetaMask tutorial:
const metamask = window.ethereum;
if (!metamask && !metamask.isMetaMask) {
console.log('The user is not authenticated or does not have permission for the application to access their wallet.');
} else if (metamask && metamask accounts.length === 0) {
console.log('MetaMask account not found. Connect your wallet and authorize the app.');
} else {
// Continue logging in
}
Solution: Verify account and method authorization
To resolve this issue, you need to verify whether the user has authorized the requested account and method. Here is an updated example:
const metamask = window.ethereum;
if (!metamask && !metamask.isMetaMask) {
console.log('The user is not authenticated or does not have permission for the application to access their wallet.');
} else if (metamask && metamask.accounts.length > 0) {
const account = metamask.account;
const method = window.web3.eth.createAccount;
for (const account of account) {
Attempt {
method wait(account);
// Continue logging in
break;
} catch (error) {
console.log(Error using wallet: ${error});
}
}
} else if (!metamask && metamask.isMetaMask) {
const account = metamask.account;
for (const account of accounts) {
Attempt {
method wait(account);
// Continue logging in
break;
} catch (error) {
console.log(Error using wallet: ${error});
}
}
} else if (metamask && metamask.accounts.length === 0) {
console.log('MetaMask account not found. Please connect your wallet and authorize the app.');
}
Best Practices
To avoid this issue in the future, it is recommended to implement additional security measures:
- Always check authorization before proceeding with user authentication.
- Use the “metamask accounts.length > 0” parameter instead of using the accounts table directly to ensure that only authorized accounts are used.
- Log all errors that occur while using the wallet, so you can diagnose issues.
By following these instructions, you can implement robust one-click login flows with MetaMask and minimize RPC errors.