How to build a public POWR Form Builder integration: Building the Auth Flow

Hey there, fellow JavaScript aficionado! Ready to dive into the world of POWR Form Builder integrations? Today, we're going to focus on one of the most crucial aspects of building a user-facing integration: the authorization flow. Buckle up, because we're about to make your integration secure and smooth as butter.

The Lowdown on POWR Form Builder

POWR Form Builder is a nifty tool that lets users create and manage forms with ease. But to tap into its full potential through an integration, we need to set up a rock-solid auth flow. Trust me, your users will thank you for it.

Before We Jump In

Make sure you've got your POWR API credentials handy and your dev environment is all set up. We're assuming you're comfortable with JavaScript and have a basic understanding of OAuth 2.0. If not, no worries – just brush up on those real quick, and you'll be good to go.

Auth Flow: The Big Picture

We're dealing with the OAuth 2.0 authorization code flow here. It's like a secret handshake between your app and POWR, ensuring that only the cool kids (your authorized users) get in. The key players in this dance are the authorization endpoint, token endpoint, and refresh token.

Let's Build This Thing!

Step 1: Kick Off the Authorization Request

First things first, we need to construct the authorization URL and send your user on a field trip to POWR's authorization page. It'll look something like this:

const authUrl = `https://www.powr.io/oauth/authorize?client_id=${YOUR_CLIENT_ID}&redirect_uri=${REDIRECT_URI}&response_type=code&scope=forms`;
// Redirect the user to authUrl

Step 2: Handle the Callback Like a Pro

Once the user gives you the thumbs up, POWR will send them back to your redirect_uri with an authorization code. Grab that code like it's the last slice of pizza:

const urlParams = new URLSearchParams(window.location.search);
const authCode = urlParams.get('code');
if (!authCode) {
  // Handle the error - maybe the user said "no thanks"
}

Step 3: Trade That Code for Tokens

Now, let's swap that authorization code for some shiny new tokens:

const tokenResponse = await fetch('https://www.powr.io/oauth/token', {
  method: 'POST',
  headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
  body: new URLSearchParams({
    grant_type: 'authorization_code',
    code: authCode,
    client_id: YOUR_CLIENT_ID,
    client_secret: YOUR_CLIENT_SECRET,
    redirect_uri: REDIRECT_URI
  })
});

const { access_token, refresh_token } = await tokenResponse.json();
// Store these tokens securely - they're your golden tickets!

Step 4: Keep Those Tokens Fresh

Access tokens don't last forever, so let's make sure we can refresh them when needed:

async function refreshAccessToken(refresh_token) {
  const response = await fetch('https://www.powr.io/oauth/token', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: new URLSearchParams({
      grant_type: 'refresh_token',
      refresh_token: refresh_token,
      client_id: YOUR_CLIENT_ID,
      client_secret: YOUR_CLIENT_SECRET
    })
  });
  return response.json();
}

Locking It Down

To make your auth flow Fort Knox-level secure, implement PKCE (Proof Key for Code Exchange) and use a state parameter to prevent CSRF attacks. Your future self will high-five you for this.

Making It Rain (API Requests)

Now that you're authenticated, it's time to make some API requests:

async function getForms(access_token) {
  const response = await fetch('https://www.powr.io/api/v1/forms', {
    headers: { 'Authorization': `Bearer ${access_token}` }
  });
  return response.json();
}

Pro Tips

1. Store tokens securely. No leaving them around like spare change on your desk.
2. Log auth events. When things go sideways (and they will), you'll thank yourself for the breadcrumbs.
3. Handle errors gracefully. Your users should never see an "Oops, something went wrong" message without some context.

Wrapping Up

And there you have it! You've just built a secure auth flow for your POWR Form Builder integration. Pat yourself on the back – you've taken a big step towards creating a seamless, secure experience for your users.

Next up, you might want to explore more of POWR's API endpoints and start building out the core functionality of your integration. But for now, take a breather and admire your handiwork. You've earned it!

Remember, the auth flow is the foundation of your integration. Get this right, and you're setting yourself up for success. Now go forth and build something awesome!