getPublicUrl does not check if file exists

[jstdk]

Describe the bug
Not sure this is a bug or a feature, but the Storage function getPublicUrl always returns a public url, even is the file does not exist. Firebase Storage provides a null in that scenario, which can then be used in the application to show an upload form. With the current Supabase flow, I need to test myself if the file exists (not sure how to be honest) and then show a form.

To Reproduce
Create a bucket, make it public, leave it empty. Create a function to query a specific file

Expected behavior
A response that either errors or nulls

Screenshots

Smartphone (please complete the following information):

• Version 1.1.0, Flutter 3.3.8

Additional context
Repo: https://github.com/jstdk/starter

[dshukertjr]

@jstdk
getPublicUrl is just a method that constructs a url from given parameters such as supabase url, bucket name, and path, so no it does not check if a file exists or not.

You can use the createSignedUrl method to get a URL if a file exists, or throw an error if it does not exist.

[Vinzent03]

@dshukertjr But isn't createSignedUrl only for private buckets useful? Isn't creating your own exists function more suited? See supabase/storage#266

[dshukertjr]

@Vinzent03 @jstdk You can still use createSignedUrl on public buckets. Also, in the original issue, it brings up how Firebase storage is able to detect whether a file exists or not. In Firebase storage, every URL it returned is a signed URL, so the use case is exactly the same as calling createSignedUrl to see if there is a file there on Supabase.

If you don't want to use createSignedUrl, nothing is stopping you from making a HTTP request to the URL to see if it returns 404 or not. You could make a HTTP HEAD request to efficiently see if a file exists or not.