Custom token auth not working

[mat...@yusofleet.com]

Hi there,

I am trying to use a custom token to authenticate to firebase like this: 

firebase.auth().signInWithCustomToken(t)

With t being my JWT, which decodes to this:

{

  "iss": "authe...@yusorelease.iam.gserviceaccount.com",

  "sub": "authe...@yusorelease.iam.gserviceaccount.com",

  "aud": "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit",

  "iat": 1502976779,

  "exp": 1502980379,

  "uid": "7065",

  "displayName": "Test",

  "claims": {

    "user_type": "operator",

    "driver_id": null

  }

}

I keep getting this error:

{code: "auth/invalid-custom-token", message: "The custom token format is incorrect. Please check the documentation."}

I think it is a configuration issue as it stoppe working in integration environment but is still working in production.

I spent the last 3 hours trying to solve this, any help would be greatly appreciated.

[Kato Richardson]

Hey Mathieu,

It looks like your token is missing `alg`, which should be set to `RS256`. Not sure if that will fix the problem, but might be a starting point.

Assuming that doesn't help, and that you're using a third party lib, you might also try creating one of these using the Firebase admin SDK and see if the results are any different. That would give us a starting point to investigate.

Lastly, note that you can't share service accounts between projects for the purposes of Authentication. So if you tried to add a service account from one project to another to use it for both, you might see unexpected results (although I think the error is different in that case).

☼, Kato

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[ישראל לבקיבקר‎]

I try a lot time to solve it.. and I found something interesting. The custom_toke end with "%3D%3D", this is not a valid, you need to replace is with "==".. and it will work good.

בתאריך יום חמישי, 17 באוגוסט 2017 בשעה 18:08:37 UTC+3, מאת mat...@yusofleet.com:

[ישראל לבקיבקר‎]

your custom token end with '==' or something else? 

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