How to configure Cloud Storage for Firebase bucket CORS when using preview channels?

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I am relying on the getBlob function to download files from Cloud Storage for Firebase directly from the browser. For this to work, I have allowlisted my app's origin in my Cloud Storage bucket. Everything works fine and is as expected.

However, I am also using Firebase Hosting's preview channels, each creating a new, unique origin. In consequence, for the getBlob function to work, I need to re-configure CORS for every new preview channel (and remove configurations for obsolete preview channels).

Is there a way to configure CORS of Cloud Storage buckets to automatically allow origins from all preview channels?

firebase-storage firebase
1 Answers

There is no way to automatically allowlist all preview channels (without allowlisting all origins. However, something you could do is use the CORS configuration API and the Firebase Hosting REST API to script automatically adding all channels after each deploy.

How this would work is essentially you would call ListChannels on your site, then use the resulting URLs from that list to populate the CORS configuration via the Cloud Storage API.

user_2263910
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