權限匿名身份驗證拒絕火力地堡數據庫

Question

我有火力數據庫，並將其工作正常，直到規則被設定爲這樣：

"rules": { 
     ".read": true, 
     ".write": false 
    } 

但現在我需要啓動我的應用程序，所以我不希望我的數據庫爲所有人開放。這就是爲什麼我改變數據庫規則：

{ 
    "rules": { 
    ".read": "auth != null", 
    ".write": "auth != null" 
    } 
} 

我從androd應用程式設定anonymouse身份驗證，但權限被拒絕的錯誤不斷出現。順便提一下，Anonymouse身份驗證可以在模擬器中正常工作。

這是我是如何實現它：

public void fireBaseAuthenticate(final Context context) { 
    mAuth = FirebaseAuth.getInstance(); 
    mAuth.signInAnonymously() 
     .addOnCompleteListener(new OnCompleteListener<AuthResult>() { 
       @Override 
       public void onComplete(@NonNull Task<AuthResult> task) { 
        if (task.isSuccessful()) { 
         // debugger comes here, so Authentication is successful 
        } else { 
         // If sign in fails, display a message to the user. 

        } 

       } 
    }); 

} 

public void load(final Context context) { 

    fireBaseAuthenticate(context); 
    database = FirebaseDatabase.getInstance(); 
    databaseReference = database.getReference(); 
    databaseReference.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
      for (DataSnapshot categorySnaps : dataSnapshot.getChildren()) { 
       RetailChain retailChain = new RetailChain(); 
       retailChain.setName(categorySnaps.getKey()); 
       for (DataSnapshot subMenuSnaps : categorySnaps.getChildren()) { 
        for (DataSnapshot itemSnaps : subMenuSnaps.getChildren()) { 
         for (DataSnapshot productSnaps : itemSnaps.getChildren()) { 
          Product product = productSnaps.getValue(Product.class); 
          productList.add(product); 
         } 
        } 
       } 
       retailChain.setProducts(productList); 
       retailChainList.add(retailChain); 
      }  
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 
      Log.w("database error: ", "onCancelled", databaseError.toException()); 
     } 
    }); 

} 

添加監聽singleValueEvent後，OnCancelled被調用。 那麼爲什麼權限被拒絕？ 編輯： 錯誤日誌：

com.google.firebase.database.DatabaseException: Firebase Database error: 
    Permission denied 
    at com.google.firebase.database.DatabaseError.toException(Unknown Source) 
    at home.gio.calorieplanner.main.Main$3.onCancelled(Main.java:205) 
    at com.google.firebase.database.Query$1.onCancelled(Unknown Source) 
    at com.google.android.gms.internal.zzbpx.zza(Unknown Source) 
    at com.google.android.gms.internal.zzbqv.zzZT(Unknown Source) 
    at com.google.android.gms.internal.zzbra$1.run(Unknown Source) 
    at android.os.Handler.handleCallback(Handler.java:739) 
    at android.os.Handler.dispatchMessage(Handler.java:95) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.app.ActivityThread.main(ActivityThread.java:5417) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Answer 1

當您設置規則"auth != null"這意味着他們在結束跡象之前，用戶不能訪問數據庫

並登錄過程是一個asynchronous，這意味着完整的監聽器不會馬上打電話給你。

要解決您的問題，只需將讀取數據庫的代碼移到完整的監聽器上即可。

public void load(final Context context) { 

    fireBaseAuthenticate(context); 

} 

public void fireBaseAuthenticate(final Context context) { 
    mAuth = FirebaseAuth.getInstance(); 
    mAuth.signInAnonymously() 
    .addOnCompleteListener(new OnCompleteListener<AuthResult>() { 
      @Override 
      public void onComplete(@NonNull Task<AuthResult> task) { 
       if (task.isSuccessful()) { 
        // load the data 
        loadFromDB(); 
       } else { 
        // If sign in fails, display a message to the user. 

       } 

      } 
    }); 

} 


private void loadFromDB(){ 
    database = FirebaseDatabase.getInstance(); 
    databaseReference = database.getReference(); 
    databaseReference.addListenerForSingleValueEvent(new ValueEventListener() { 
     @Override 
     public void onDataChange(DataSnapshot dataSnapshot) { 
     for (DataSnapshot categorySnaps : dataSnapshot.getChildren()) { 
      RetailChain retailChain = new RetailChain(); 
      retailChain.setName(categorySnaps.getKey()); 
      for (DataSnapshot subMenuSnaps : categorySnaps.getChildren()) { 
       for (DataSnapshot itemSnaps : subMenuSnaps.getChildren()) { 
        for (DataSnapshot productSnaps : itemSnaps.getChildren()) { 
         Product product = productSnaps.getValue(Product.class); 
         productList.add(product); 
        } 
       } 
      } 
      retailChain.setProducts(productList); 
      retailChainList.add(retailChain); 
     }  
     } 

     @Override 
     public void onCancelled(DatabaseError databaseError) { 
     Log.w("database error: ", "onCancelled", databaseError.toException()); 
     } 
    }); 

}