Receiving returned data from firebase callable functions

Question

I\'m playing with Callable HTTPS-functions in iOS. I\'ve created and deployed the following function:

export const generateLoginToken = functions.https.onCal         


        

Answer 1

Yikes! The issue was that I forgot to return the actual promise from the cloud function. This function is working:

export const generateLoginToken = functions.https.onCall((data, context) => {

    const uid = data.user_id
    if (!(typeof uid === 'string') || uid.length === 0) {
        throw new functions.https.HttpsError('invalid-argument', 'The function must be called with one argument "user_id" ');
    }

    return admin.auth().createCustomToken(uid)
    .then((token) => {
        console.log("Did create custom token:", token)
        return { text: "some_data" };
    }).catch((error) => {
        console.log("Error creating custom token:", error)
        throw new functions.https.HttpsError('internal', 'createCustomToken(uid) has failed for some reason')
    })
})