[firebase-auth] Blocking function timeout returns UNKNOWN error code (code 47) instead of a dedicated timeout code

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android, java

调研方向

首先跟踪 Android SDK 如何处理 beforeUserCreated 和 createUserWithEmailAndPassword 期间阻塞函数的超时,包括它变为 UNKNOWN/错误代码 47 的位置。比较现有的身份验证错误映射,并确定引入专用超时代码的范围。当 Android Auth 使用者可以将超时失败与通用内部错误区分开时,即视为完成。

由索引模型根据 Issue 内容生成。

描述

api: auth needs-attention

Description

When a Firebase Auth blocking function (e.g. beforeUserCreated) times out, the Android SDK throws an error with code UNKNOWN (error code 47) instead of a dedicated, meaningful error code.

This makes it impossible for developers to programmatically distinguish between a genuine internal error and a blocking function timeout, leading to hours of debugging.

Steps to Reproduce

  1. Set up a beforeUserCreated blocking function that takes longer than the allowed timeout.
  2. Call createUserWithEmailAndPassword (or any auth method guarded by the blocking function) from an Android app.
  3. Observe the exception: it surfaces as UNKNOWN / error code 47 with a generic message like "An internal error has occurred."

Expected Behavior

A dedicated error code (e.g. BLOCKING_FUNCTION_TIMEOUT or similar) should be returned so that developers can handle this case explicitly.

Actual Behavior

The error is surfaced as UNKNOWN (error code 47):

Error code: 47
Message: An internal error has occurred.

From Flutter/FlutterFire (where this was originally reported):

[firebase_auth/unknown] An internal error has occurred. [ Error code:47
FirebaseAuthException
Firebase Auth error code: unknown
Firebase Auth error message: An internal error has occurred. [ Error code:47

Context

This was reported on the FlutterFire repository: https://github.com/firebase/flutterfire/issues/18022

The FlutterFire maintainer confirmed that error codes and messages are passed through as-is from the native Android SDK, and recommended opening this issue upstream to request a dedicated error code for blocking function timeouts.

A dedicated error code would benefit all Firebase Auth consumers on Android (native and cross-platform via FlutterFire, React Native Firebase, etc.).

Platform

  • Android (Firebase Auth Android SDK)
  • Also surfaced via FlutterFire (Flutter wrapper)
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