I'm trying to use firebase functions to do maintenance of my database and storage. Basically remove some old entries from one ref/bucket to another after they expire.
The database part works great. However, the storage part, not so much. Here's how I initialize everything in my code:

var functions = require('firebase-functions');

var admin = require("firebase-admin");

var serviceAccount = require('./my-app-bla-bla.json');



admin.initializeApp({

  credential: admin.credential.cert(serviceAccount),

  databaseURL: 'https://my-app.firebaseio.com',

  storageBucket: 'gs://my-app.appspot.com'

});

Then in the cron job that cleans the database and storage, I have the following (this is only some small relevant part):

const st = admin.storage();



st.bucket("gs://my-app.appspot.com/old-listings/"+listingKey).create(function(error, bucket, apiResponse) {

    if (error) {

        console.log("Couldn't create an OldListing bucket: " + error.code);

        console.log(apiResponse);

    } else {

        console.log("Created OldListing bucket");

    }

});

This last piece of code triggers the error and gives me the following log:

Couldn't create an OldListing bucket: 400

{ error: 

   { errors: [ [Object] ],

     code: 400,

     message: 'Invalid bucket name: 'my-app.appspot.com/old-listings/SomeUniqueID'' } }

Because I'm running this code for the first time, the folder old-listings does not exist yet. So I though maybe I should create its bucket on its own first. It gives me the same error.

I also tried using the buckets without the gs link, e.g. st.bucket("old-listings/"+listingKey) instead of st.bucket("gs://my-app.appspot.com/old-listings/"+listingKey). Still gives me the same error.

so what exactly is missing here? What am I doing wrong?

Edit 1

I tried adding the following code snippet at the beginning of my cron function. In an effort to better understand what's going on.

admin.storage().bucket("my-app.appspot.com").exists(function(error, exists) {

    if (!error) {

        if (exists) {

            console.log("Top Bucket Exists");

        } else {

            console.log("Top Bucket Does Not Exist");

        }

    } else {

        console.log("Top Bucket Error " + error.code);

    }

});



admin.storage().bucket("my-app.appspot.com/listings").exists(function(error, exists) {

    if (!error) {

        if (exists) {

            console.log("Listings Bucket Exists");

        } else {

            console.log("Listings Bucket Does Not Exist");

        }

    } else {

        console.log("Listings Bucket Error " + error.code);

    }

});

I get the following in my log:

Top Bucket Exists

Listing Bucket Error undefined

Of course I already have a folder called listings in my firebase storage. So why on earth would the second bucket be undefined?

When you build a name to a bucket, it's not supposed to contain file path components in it, It should just be the unique name of the bucket - the container for all your objects. If you want to reference a file in the bucket, use the file() method on the bucket object to get a File object to deal with.

const st = admin.storage();

const bucket = st.bucket('name-of-your-bucket');

const file = bucket.file('name-of-your-file');