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

Hey there, fellow JavaScript enthusiast! Ready to dive into the world of SharpSpring integrations? Let's roll up our sleeves and build an auth flow that'll make your integration shine. We'll keep things concise and focused, so you can get up and running in no time.

Introduction

SharpSpring's API is a powerful tool for marketers, and as a developer, you're about to unlock its full potential. The key to a smooth integration? A rock-solid authorization flow. It's not just about getting access; it's about doing it securely and efficiently.

Prerequisites

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

• Your SharpSpring API credentials (if you don't have them, go grab 'em!)
• A Node.js environment with Express.js set up (I know you've got this covered)

OAuth 2.0 Flow Overview

We're using the Authorization Code Grant type here. It's like a secret handshake between your app and SharpSpring, ensuring that only the cool kids (your users) get in.

Setting up the Authorization Request

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

const authUrl = `https://api.sharpspring.com/pubapi/authorize?` +
                `client_id=${clientId}&` +
                `redirect_uri=${encodeURIComponent(redirectUri)}&` +
                `response_type=code`;

Pro tip: Make sure your redirect URI is configured in your SharpSpring app settings. It's like telling the bouncer where to send people after they show their ID.

Handling the Authorization Callback

When SharpSpring redirects back to your app, it's time to grab that sweet, sweet authorization code:

app.get('/callback', (req, res) => {
  const { code, error } = req.query;
  if (error) {
    // Handle the error like a boss
    return res.status(400).send(`Auth error: ${error}`);
  }
  // Use the code to get an access token (we'll do this next)
});

Exchanging the Authorization Code for Access Token

Now, let's trade that code for an access token:

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

const { access_token, refresh_token } = tokenResponse.data;

Storing and Managing Tokens

Store these tokens securely. Treat them like your Netflix password – you don't want just anyone using them.

Making Authenticated Requests

With your access token, you're ready to make API calls:

const apiResponse = await axios.get('https://api.sharpspring.com/pubapi/v1/some-endpoint', {
  headers: { Authorization: `Bearer ${access_token}` }
});

Token Refresh Process

Access tokens don't last forever. When they expire, use the refresh token to get a new one:

const refreshResponse = await axios.post('https://api.sharpspring.com/pubapi/token', {
  grant_type: 'refresh_token',
  refresh_token: storedRefreshToken,
  client_id: clientId,
  client_secret: clientSecret
});

Error Handling and Edge Cases

Always be prepared for the unexpected. Handle invalid tokens, revoked access, and other quirks gracefully. Your users will thank you.

Security Best Practices

• Always use HTTPS. Always.
• Encrypt tokens at rest. They're valuable, treat them that way.

Testing the Authorization Flow

Test thoroughly:

1. Try the happy path
2. Attempt with invalid credentials
3. Test token expiration and refresh

Consider setting up automated tests. Your future self will high-five you for this.

Conclusion

And there you have it! You've just built a robust auth flow for your SharpSpring integration. Remember, the devil's in the details, so pay attention to security and error handling.

Now go forth and integrate! Your app is about to become a marketing powerhouse. If you hit any snags, the SharpSpring docs are your friend, and so is the developer community. Happy coding!