Example flow: React Component with TailwindCSS for "Connect" Button

To create a React component styled with TailwindCSS that implements a "Connect" button functionality like in the Terra Widget, follow these steps.

This button, upon being clicked, will call an API endpoint on your backend (in this case, this will be /auth/fitbit for demonstration purposes) and redirect the user to the Fitbit login page. The example assumes you have React and TailwindCSS set up in your project.

Create the React Component

// ConnectButton.js
import React from 'react';

const ConnectButton = () => {
  const handleConnect = async () => {
    try {
      // Assuming your backend is set up to receive an auth token from the user and validate it
      // Implement rate limiting on the backend to avoid abuse
      const response = await fetch('/auth/fitbit', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer SOME_TOKEN'
        },
        body: JSON.stringify(credentials),
      });

      const data = await response.json();

      if (data.status === 'success' && data.auth_url) {
        window.location.href = data.auth_url; // Redirect the user
      } else {
        console.error('Authentication failed');
      }
    } catch (error) {
      console.error('Error connecting to Fitbit:', error);
    }
  };

  return (
    <button
      onClick={handleConnect}
      className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded"
    >
      Connect Fitbit Account
    </button>
  );
};

export default ConnectButton;

This component sends the necessary credentials to your /auth/fitbit endpoint and redirects the user based on the response. Make sure to ensure the logic for passing in SOME_TOKEN exists on your client side, and that the token is securely generated & handled thereafter

Backend: /auth/fitbit Endpoint

The /auth/fitbit endpoint on the backend should perform the following:

Receive the request from the frontend.
Extract the necessary authentication credentials from the request.
Make a call to Terra API's authentication endpoint (https://api.tryterra.co/v2/auth/authenticateUser?resource=fitbit) with the dev-id and x-api-key headers for authentication.
Respond to the frontend with the auth_url received from the Terra API (without saving the user_id at this stage - this is provided only for informational purposes)

Here is a conceptual implementation:

// Assuming you're using Express.js for your backend
const express = require('express');
const fetch = require('node-fetch');
const app = express();

app.use(express.json());

app.post('/auth/fitbit', async (req, res) => {

  try {
    const response = await fetch('https://api.tryterra.co/v2/auth/authenticateUser?resource=fitbit', {
      method: 'GET',
      headers: {
        'dev-id': YOUR_DEV_ID,
        'x-api-key': YOUR_API_KEY,
      },
    });

    const data = await response.json();

    if (data.status === 'success' && data.auth_url) {
      res.json({ auth_url: data.auth_url }); // Send only the auth_url to the frontend
    } else {
      res.status(400).json({ error: 'Failed to authenticate with Fitbit' });
    }
  } catch (error) {
    res.status(500).json({ error: 'Internal server error' });
  }
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});

This backend handler securely communicates with the Terra API and relays the auth_url to the frontend without saving the user_id, adhering to the specified flow.

The above could be re

Please ensure you have proper error handling and security measures in place to protect abusing your /auth/fitbit endpoint, and manage API rate limiting effectively. This will help prevent malicious users from generating a bunch of fitbit users, and increasing your Terra bill (not that we would complain of course 😉)

Generalizing the previous example

To generalize the React component and backend endpoint for connecting to any health data provider like Garmin or Oura, or any other integration supported by Terra, you can modify the existing code to accept a provider name as a parameter. This allows the same component and endpoint to handle authentication for multiple providers by dynamically adjusting the API call based on the chosen provider.

Generalizing the React Component

Modify the ConnectButton component to accept a provider prop. This prop will be used to determine which service (Fitbit, Garmin, Oura, etc.) the user intends to connect to.

// ConnectButton.js
import React from 'react';

const ConnectButton = ({ provider }) => {
  const handleConnect = async () => {
    try {
      // Assuming your backend is set up to receive an auth token from the user and validate it
      // Implement rate limiting on the backend to avoid abuse
      const response = await fetch(`/auth/${provider}`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer SOME_TOKEN'
        },
        body: JSON.stringify(credentials),
      });

      const data = await response.json();

      if (data.status === 'success' && data.auth_url) {
        window.location.href = data.auth_url; // Redirect the user
      } else {
        console.error('Authentication failed');
      }
    } catch (error) {
      console.error(`Error connecting to ${provider}:`, error);
    }
  };

  return (
    <button
      onClick={handleConnect}
      className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded"
    >
       Connect to {provider.charAt(0).toUpperCase() + provider.slice(1)}
    </button>
  );
};

export default ConnectButton;

Generalizing the Backend Endpoint

Modify the backend endpoint to dynamically adjust the API URL and parameters based on the provider specified in the request.

// Assuming you're using Express.js for your backend
const express = require('express');
const fetch = require('node-fetch');
const app = express();

app.use(express.json());

app.post('/auth/:provider', async (req, res) => {
  const { provider } = req.params; // Get the provider from the URL
  
  try {
    const response = await fetch(`https://api.tryterra.co/v2/auth/authenticateUser?resource=${provider}`, {
      method: 'GET',
      headers: {
        'dev-id': YOUR_DEV_ID,
        'x-api-key': YOUR_API_KEY,
      },
    });

    const data = await response.json();

    if (data.status === 'success' && data.auth_url) {
      res.json({ auth_url: data.auth_url });
    } else {
      res.status(400).json({ error: `Failed to authenticate with ${provider}` });
    }
  } catch (error) {
    res.status(500).json({ error: `Internal server error while connecting to ${provider}` });
  }
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});