How to build a public Leadpages integration: Building the Auth Flow

Aug 12, 2024 • 6 minute read

Hey there, fellow JavaScript enthusiasts! Ready to dive into the world of Leadpages integration? Today, we're focusing on the crucial part of any integration: the authorization flow. Let's get your users connected to Leadpages seamlessly and securely.

Prerequisites

Before we jump in, make sure you've got:

Leadpages API credentials (if you don't have these yet, hop over to their developer portal)
A Node.js and Express.js setup (I'm assuming you're comfortable with these)

OAuth 2.0 Flow: The Quick Rundown

We're using the Authorization Code Grant type here. It's like a secret handshake between your app and Leadpages. You'll need your client ID, client secret, and a redirect URI. Keep these close!

Let's Build This Auth Flow!

Step 1: Kick Off the Authorization Request

First things first, let's get that authorization URL built:

const authUrl = `https://api.leadpages.io/oauth/authorize?client_id=${clientId}&redirect_uri=${redirectUri}&response_type=code`;

Now, send your user to this URL. They'll log in to Leadpages, and boom – the ball's rolling.

Step 2: Handle That Callback

Leadpages will send the user back to your redirect URI with a shiny new authorization code. Catch it like this:

app.get('/callback', (req, res) => {
  const { code } = req.query;
  // Time to use this code!
});

Don't forget to handle errors here. Users can be unpredictable!

Step 3: Trade Code for Access Token

Now for the good stuff. Exchange that code for an access token:

const tokenResponse = await axios.post('https://api.leadpages.io/oauth/token', {
  grant_type: 'authorization_code',
  code,
  client_id: clientId,
  client_secret: clientSecret,
  redirect_uri: redirectUri
});

const { access_token, refresh_token } = tokenResponse.data;

Store these tokens securely. They're your golden tickets!

Step 4: Keep It Fresh with Token Refresh

Access tokens don't last forever. Let's set up a refresh mechanism:

async function refreshAccessToken(refreshToken) {
  const response = await axios.post('https://api.leadpages.io/oauth/token', {
    grant_type: 'refresh_token',
    refresh_token: refreshToken,
    client_id: clientId,
    client_secret: clientSecret
  });
  
  return response.data.access_token;
}

Securing Your Integration

Security isn't just a buzzword – it's crucial. Here are some quick tips:

Store tokens in a secure database, not in local storage
Implement PKCE (Proof Key for Code Exchange) for added security
Use HTTPS everywhere. Seriously, everywhere.

Testing Your Auth Flow

Manual testing is great, but automated tests are your friends. Set up some tests to ensure your flow works smoothly, especially around token refresh and error handling.

Handling Errors Like a Pro

Auth flows can be tricky. Common errors include expired tokens, invalid grants, and network issues. Always have a plan B:

try {
  // Your auth code here
} catch (error) {
  if (error.response && error.response.status === 401) {
    // Time to refresh that token!
  } else {
    // Handle other errors gracefully
  }
}

Wrapping Up

And there you have it! You've just built a robust auth flow for your Leadpages integration. Remember, the key to a great integration is a smooth user experience and rock-solid security.

Next steps? Start building out those API calls and create something awesome!

Want to Learn More?

Check out these resources:

Now go forth and integrate! Your users will thank you for it. Happy coding! 🚀