Firebase Auth crash when R8 full mode obfuscation enabled

[audkar]

[READ] Step 1: Are you in the right place?

Y

[REQUIRED] Step 2: Describe your environment

• Android Studio version: 4.0
• Firebase Component: Auth
• Component version: 20.0.0

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

If application is build with android.enableR8.fullMode=true then crash happens during login using google Sign-in.
With setting android.enableR8.fullMode=false app runs fine.

Stacktrace:

Fatal Exception: com.google.firebase.FirebaseException: An internal error has occurred. [ Instantiation of JsonResponse failed! class com.google.android.gms.internal.firebase-auth-api.zzok ]
       at com.google.firebase.auth.api.internal.zzem.zza(com.google.firebase:firebase-auth@@20.0.0:29)
       at com.google.firebase.auth.api.internal.zzfx.zza(com.google.firebase:firebase-auth@@20.0.0:14)
       at com.google.firebase.auth.api.internal.zzfs.zza(com.google.firebase:firebase-auth@@20.0.0:44)
       at com.google.firebase.auth.api.internal.zzel.zza(com.google.firebase:firebase-auth@@20.0.0:10)
       at com.google.firebase.auth.api.internal.zzac.zza(com.google.firebase:firebase-auth@@20.0.0:2)
       at com.google.android.gms.common.util.DeviceProperties.zza(com.google.android.gms:play-services-basement@@17.1.1:131)
       at com.google.firebase.auth.api.internal.zzfn.zza(com.google.firebase:firebase-auth@@20.0.0:10)
       at com.google.firebase.auth.api.internal.zzep.zza(com.google.firebase:firebase-auth@@20.0.0:53)
       at com.google.firebase.auth.api.internal.zzda.accept(com.google.firebase:firebase-auth@@20.0.0:9)
       at com.google.android.gms.common.api.internal.zaf.zac(com.google.android.gms:play-services-base@@17.1.0:6)
       at com.google.android.gms.common.api.internal.GoogleApiManager$zaa.zac(com.google.android.gms:play-services-base@@17.1.0:2)
       at com.google.android.gms.common.api.internal.GoogleApiManager$zaa.zab(com.google.android.gms:play-services-base@@17.1.0:5)
       at com.google.android.gms.common.api.internal.GoogleApiManager$zaa.zaa(com.google.android.gms:play-services-base@@17.1.0:5)
       at com.google.android.gms.common.api.internal.GoogleApiManager.handleMessage(com.google.android.gms:play-services-base@@17.1.0:113)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at com.google.android.gms.internal.base.zar.dispatchMessage(com.google.android.gms:play-services-base@@17.1.0:1)
       at android.os.Looper.loop(Looper.java:223)
       at android.os.HandlerThread.run(HandlerThread.java:67)

Relevant Code:

val task = GoogleSignIn.getSignedInAccountFromIntent(result.data)
val account = task.getResult(ApiException::class.java)
val auth = FirebaseAuth.getInstance()
val credential = GoogleAuthProvider.getCredential(account.idToken, null)
val firebaseUser = auth.signInWithCredential(credential).await()

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[malcolmdeck]

Hey there! I've filed b/172259754 to track this internally :)

[malcolmdeck]

Ok, it appears that this only happens when you use android.enableR8.fullMode=true and not android.enableR8=true. That's a reasonable workaround while I figure out if there's a way to fix this.

To be noted: I think the root cause is a use of reflection at the network layer of the SDK. I don't yet know how to protect classes when using enableR8, so it's gonna take me a bit to see if this is a fixable problem via something like proguard rules or if I have to see if it's possible to fix the underlying issue itself.

[b95505017]

@malcolmdeck Any update? I don't want to turn off full mode of R8 just because upgrading firebase sdk.

[devaniumesh]

same problem here. in firebase latest sdk. When using android.enableR8.fullMode=true . it's release version not working

[valentynsmetanin]

It's still reproducing with:
android.enableR8.fullMode=true
com.google.firebase:firebase-bom:26.2.0
com.google.firebase:firebase-auth-ktx

[benjaminojanne]

Hello
I found a solution to the problem today.
Go to proguard-rules.pro file and add this:

-keep class com.google.android.gms.internal.** { *; }

[b95505017]

@benjaminojanne Thanks but I think that will keep so many redundant thinks.

[b95505017]

@benjaminojanne It seems that you could specify to the path within auth library
-keep class com.google.android.gms.internal.firebase-auth-api.** { *; }

[nuhkoca]

Any update on this without requiring a path?