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

Hey there, fellow JavaScript enthusiasts! Ready to dive into the world of Landingi integrations? Today, we're going to walk through building a rock-solid authorization flow for your public Landingi integration. Buckle up, because we're about to make your integration secure and user-friendly in one fell swoop.

Introduction

Landingi is a powerful landing page builder, and integrating it into your app can open up a world of possibilities. But before we can start playing with landing pages, we need to nail down our auth flow. Trust me, getting this right from the start will save you headaches down the road.

Prerequisites

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

• Landingi API credentials (if you don't have these yet, hop over to the Landingi developer portal)
• A Node.js environment with Express.js set up (I'm assuming you've got this covered, but if not, there are plenty of great tutorials out there)

OAuth 2.0 Flow Overview

We'll be using the OAuth 2.0 Authorization Code Grant flow. It's like a secret handshake between your app and Landingi, ensuring that users can safely grant you access to their Landingi data without sharing their credentials.

Setting up the Authorization Request

First things first, let's construct that authorization URL:

const authUrl = `https://api.landingi.com/oauth/authorize?
  response_type=code&
  client_id=${YOUR_CLIENT_ID}&
  redirect_uri=${encodeURIComponent(REDIRECT_URI)}&
  scope=read_landing_pages`;

Now, set up an endpoint to handle the redirect:

app.get('/callback', (req, res) => {
  // We'll flesh this out in a moment
});

Handling the Authorization Code

When the user grants permission, Landingi will redirect them back to your app with a code. Let's grab it:

app.get('/callback', (req, res) => {
  const { code, error } = req.query;
  
  if (error) {
    // Handle the error - maybe the user said "no thanks"
    return res.send("Oops! Access denied.");
  }
  
  // Use this code to get tokens
  exchangeCodeForTokens(code);
});

Token Exchange

Time to swap that code for some sweet, sweet tokens:

async function exchangeCodeForTokens(code) {
  const response = await axios.post('https://api.landingi.com/oauth/token', {
    grant_type: 'authorization_code',
    code,
    client_id: YOUR_CLIENT_ID,
    client_secret: YOUR_CLIENT_SECRET,
    redirect_uri: REDIRECT_URI
  });
  
  const { access_token, refresh_token } = response.data;
  // Store these securely - we'll talk about this in a sec
}

Refreshing Access Tokens

Access tokens don't last forever, so let's set up a refresh mechanism:

async function refreshAccessToken(refresh_token) {
  const response = await axios.post('https://api.landingi.com/oauth/token', {
    grant_type: 'refresh_token',
    refresh_token,
    client_id: YOUR_CLIENT_ID,
    client_secret: YOUR_CLIENT_SECRET
  });
  
  return response.data.access_token;
}

Making Authenticated Requests

Now that we've got our tokens, let's use them:

async function getLandingPages(access_token) {
  try {
    const response = await axios.get('https://api.landingi.com/v2/landing-pages', {
      headers: { Authorization: `Bearer ${access_token}` }
    });
    return response.data;
  } catch (error) {
    if (error.response && error.response.status === 401) {
      // Time to refresh that token!
      const new_access_token = await refreshAccessToken(stored_refresh_token);
      // Retry the request with the new token
    }
  }
}

Security Considerations

Security isn't just a feature, it's a lifestyle. Here are some tips:

• Always use HTTPS
• Implement the state parameter to prevent CSRF attacks
• Store tokens securely (consider encryption at rest)

Testing the Auth Flow

Before you ship it, test it! Here's a quick checklist:

1. Initiate the auth flow
2. Grant permissions on Landingi
3. Verify token receipt
4. Make an API call
5. Test token refresh

Consider setting up some automated tests too – your future self will thank you.

Conclusion

And there you have it! You've just built a secure auth flow for your Landingi integration. With this foundation, you're all set to start building some amazing features. Remember, a solid auth flow is the backbone of any good integration.

Additional Resources

Want to dive deeper? Check out:

• Landingi API Documentation
• OAuth 2.0 Specification
• node-oauth - A handy npm package for OAuth

Now go forth and integrate with confidence! If you run into any snags, remember – the developer community has got your back. Happy coding!