I am testing hashing in the rules playground:
This returns "CRexOpCRkV1UtjNvRZCVOczkUrNmGyHzhkGKJXiDswo=", the correct hash of the string "SECRET" :
let expected = hashing.sha256("SECRET");
But this returns "SECRETpath/to/the/file.mp4", the argument itself instead of its hash:
let expected = hashing.sha256("SECRET" + request.resource.name);
Is it a bug in the rules playground?
Can hashing functions be used on dynamic values or is it intentionally prevented?
The strange rules playground behavior has been mentioned here before, this time with Firestore security rules: Firestore rules hashing returns identity
Firebaser here!
There are a few issues at play here. I think the primary source of confusion is that the hashing.sha256 function returns a rules.Bytes type. It appears that the Rules Playground in the Firebase Console incorrectly shows a string value when debugging the bytes type, but that is unrelated to behavior in production. For example, this Rule will always deny:
allow write: if hashing.sha256("SECRET" + request.resource.name) ==
"SECRET" + request.resource.name;
To get the behavior you're looking for, you need to use one of the conversion functions for the rules.Bytes type. Based on your question, you'll probably want the toBase64() function, but toHexString() is also an option. If you try these functions in your Rules, the Playground should start behaving correctly and the Rules will work as expected in production as well. So to put it all together, you'd write:
let expected = hashing.sha256("SECRET" + request.resource.name).toBase64();
For example, the rules listed below would allow you to upload a file called "foo/bar" (as Gqot1HkcleDFQ5770UsfmKDKQxt_-Jp4DRkTNmXL9m4= is the Base64 SHA-256 hash of "SECRETfoo/bar")
allow write: if hashing.sha256('SECRET' + request.resource.name).toBase64() ==
"Gqot1HkcleDFQ5770UsfmKDKQxt_-Jp4DRkTNmXL9m4=";
I hope this helps clear things up! Separately we will look into addressing the wrong debugging output in the Playground