Advaned URL Routing in Google Cloud Functions for Firebase
If you're as in love with Google Cloud Functions for Firebase as I am, you're likely a bit sad to hear that every HTTPS function ties to one specific URL.
For example, by default, a function named date ties to a location like...
https://us-central1-<project-id>.cloudfunctions.net/date
This is fine for simple functions, but what if you want complete control over your URL routing?
Well we got you, fam. You can actually pass in a normal Express app to handle your function calls.
const functions = require('firebase-functions');
const app = require('express')();
app.get('/', (req, res) => {
res.send(`Root page`);
});
app.get('/second', (req, res) => {
res.send(`Sub function`);
});
app.get('/hello/:name', (req, res) => {
res.send(`Hello ${req.params.name}`);
});
// We name this function "route", which you can see is
// still surfaced in the HTTP URLs below.
exports.route = functions.https.onRequest(app);
Now this "single function" can actually call many different paths.
# curl https://YOUR_FUNCTIONS_URL/route/
Root page
# curl https://YOUR_FUNCTIONS_URL/route/second
Sub function
# curl https://YOUR_FUNCTIONS_URL/route/hello/abe
Hello abe
And yes this works with middleware, too.
Awesome, right? Happy functioning!