Enable Cors in Firebase Cloud Function
There are two ways to solve this
- Using externally library to handle
OPTIONS
call
cors
- Handle
OPTIONS
call manually
Get request Method from headers
Check if the method is OPTIONS
Resolve the API with 200
status code.
exports.addUser = functions.https.onRequest((req, res) => {
res.set('Access-Control-Allow-Origin', '*');
res.set('Access-Control-Allow-Methods', 'GET, PUT, POST, OPTIONS');
res.set('Access-Control-Allow-Headers', '*');
if (req.method === 'OPTIONS') {
res.end();
}
else{
if (req.body.username != null && req.body.firstname != null && req.body.lastname != null && req.body.addr1 != null && req.body.addr2 != null || req.body.username != undefined && req.body.firstname != undefined && req.body.lastname != undefined && req.body.addr1 != undefined && req.body.addr2 != undefined ) {
let docId = Math.floor(Math.random() * (99999 - 00000));
let newUser = {
"username": req.body.name,
"firstname": req.body.firstname,
"lastname": req.body.lastname,
"addr1": req.body.addr1,
"addr2": req.body.addr2,
}
usersCollection.add(newUser).then(snapshot => {
res.send(200, {
"message": "User was successfully created"
})
});
} else {
res.send(400, {
"message": "All fields are required"
})
}
}
});