Deep dive into Post-Conditions

Install dependencies

These are the three main packages we'll use to authenticate users and build our transactions for broadcasting to the Stacks blockchain network.

Initiate a userSession with specific permission scopes

After installing the @stacks/connect package, the next step is to initiate a userSession with specific permission scopes.

Trigger the authentication flow with the showConnect function

Let's create an authenticate function that will call showConnect, triggering the popup that initiates the authentication process for users, one in which they'll authenticate with a Secret Key that's used to encrypt their private data.

function authenticate() {
  showConnect({
    appDetails: {
      name: 'My App',
      icon: window.location.origin + '/my-app-logo.svg',
    },
    redirectTo: '/',
    onFinish: () => {
      let userData = userSession.loadUserData();
    },
    userSession: userSession,
  });
}

Once the user confirms, they will be redirected to the installed web wallet to authenticate with the authRequest token.

Handle Pending Authentication

After the authentication process is initiated, it's crucial to handle cases where the user hasn't completed the authentication flow. This involves managing the pending authentication state when the user is redirected back to the app without having confirmed their authentication in the popup window.

import { AppConfig, UserSession, showConnect } from '@stacks/connect';

const appConfig = new AppConfig(['store_write', 'publish_data']);
const userSession = new UserSession({ appConfig });

window.onload = function () {
  if (userSession.isSignInPending()) {
    userSession.handlePendingSignIn().then(userData => {
      // Save or otherwise utilize userData post-authentication
    });
  } else if (userSession.isUserSignedIn()) {
    // Handle case in which user is already authenticated
  }
};

The isSignInPending method checks if there's a pending sign-in to process. If so, handlePendingSignIn processes the pending sign-in, allowing you to save or use the user's data post-authentication. For users already signed in, you can directly access their session information or proceed with your app's flow.