Part 3: Create Function

Prompt

const functions = require('@google-cloud/functions-framework');
const axios = require('axios');

const TOKENINFO_URL = 'https://oauth2.googleapis.com/tokeninfo';

// Register an HTTP function with the Functions Framework that will be executed
// when you make an HTTP request to the deployed function's endpoint.
functions.http('executeGCPFunction', async (req, res) => {
  const authHeader = req.headers.authorization;

  if (!authHeader) {
    return res.status(401).send('Unauthorized: No token provided');
  }

  const token = authHeader.split(' ')[1];
  if (!token) {
    return res.status(401).send('Unauthorized: No token provided');
  }

  try {
    const tokenInfo = await validateAccessToken(token);            
    res.json("You have connected as an authenticated user to Google Functions");
  } catch (error) {
    res.status(401).send('Unauthorized: Invalid token');
  }  
});

async function validateAccessToken(token) {
  try {
    const response = await axios.get(TOKENINFO_URL, {
      params: {
        access_token: token,
      },
    });
    return response.data;
  } catch (error) {
    throw new Error('Invalid token');
  }
}