async function getFirebaseUser()

in fulltext-search-firestore/functions/index.js [51:78]

• 25 lines of code
• 6 McCabe index (conditional complexity)

async function getFirebaseUser(req, res, next) {
  functions.logger.log('Check if request is authorized with Firebase ID token');

  if (!req.headers.authorization || !req.headers.authorization.startsWith('Bearer ')) {
    functions.logger.error(
      'No Firebase ID token was passed as a Bearer token in the Authorization header.',
      'Make sure you authorize your request by providing the following HTTP header:',
      'Authorization: Bearer <Firebase ID Token>'
    );
    return res.sendStatus(403);
  }

  let idToken;
  if (req.headers.authorization && req.headers.authorization.startsWith('Bearer ')) {
    functions.logger.log("Found 'Authorization' header");
    idToken = req.headers.authorization.split('Bearer ')[1];
  }

  try {
    const decodedIdToken = await admin.auth().verifyIdToken(idToken);
    functions.logger.log('ID Token correctly decoded', decodedIdToken);
    req.user = decodedIdToken;
    return next();
  } catch(error) {
    functions.logger.error('Error while verifying Firebase ID token:', error);
    return res.status(403).send('Unauthorized');
  }
}