如何限制使用Firebase中的安全规则的子节点（Swift）

问题描述：

我正在开发使用Firebase的基于回合的游戏。我的游戏有游戏室，每个房间最多包含3个子节点。这些是玩家1，玩家2和当前用户数量。我的情况是，Player1创建了一个包含2个子节点的空间（Player1 ID和当前用户数）。玩家1正在等待1个敌人。但是，如果其他玩家同时点击加入，则该房间将有3名玩家。我如何使用安全规则避免这种情况？如何限制使用Firebase中的安全规则的子节点（Swift）

我相关的数据库部分文字象下面这样：

"QuickPlay3hanePlaying" : { 
"ByVmFbUC6HS01v4SASeA2ev33zz1" : { 
    "3s6TdUxImrNhMReJbS8kBh4I9im1" : { 
    "IQ" : 1350, 
    "date" : 1.474527951467337E9, 
    "gizliSayi" : [ 1, 2, 3, 4, 5 ], 
    "isReady" : 0, 
    "isSiraBende" : 0, 
    "isWin" : 0, 
    "name" : "Emre Esen", 
    "photoUrl" : "https://scontent.xx.fbcdn.net/v/t1.0-1/p200x200/1796656_10203231676898828_1482882234_n.jpg?oh=b1600006284e4e8ca9411d804c5571a2&oe=5880E580", 
    "sonTahminim" : [ 1, 2, 3, 4, 5 ], 
    "uid" : "3s6TdUxImrNhMReJbS8kBh4I9im1" 
    }, 
    "ByVmFbUC6HS01v4SASeA2ev33zz1" : { 
    "IQ" : 1280, 
    "date" : 1.474527943420204E9, 
    "gizliSayi" : [ 1, 2, 3, 4, 5 ], 
    "isReady" : 0, 
    "isSiraBende" : 1, 
    "isWin" : 0, 
    "name" : "Emot Emot", 
    "photoUrl" : "https://scontent.xx.fbcdn.net/v/t1.0-1/p200x200/14225541_330456493965915_6052582248934611374_n.jpg?oh=35c26a6ea69a3266451a33908c7a060a&oe=586E13B1", 
    "sonTahminim" : [ 1, 2, 3, 4, 5 ], 
    "uid" : "ByVmFbUC6HS01v4SASeA2ev33zz1" 
    }, 
    "userSayisi" : 2 
}

}

创建房间代码块：

func createRoom(){ 


    Model.sharedInstance.QuickPlayOdaAdi = Model.sharedInstance.userFirebaseID 

    setPlayerInfo() 

    let interval = NSDate().timeIntervalSince1970 

    let info = ["photoUrl":Model.sharedInstance.userPictureUrl, 
       "uid":Model.sharedInstance.userFirebaseID, 
       "IQ":Model.sharedInstance.userIQ, 
       "name":Model.sharedInstance.username, 
       "isSiraBende":1, 
       "gizliSayi":Model.sharedInstance.gizliSayi, 
       "isReady":Model.sharedInstance.isReadyForPlaying, 
       "isWin":Model.sharedInstance.isWin, 
       "sonTahminim":Model.sharedInstance.rakipSonTahmini, 
       "date":interval] 


    Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.userFirebaseID).setValue(["userSayisi":1]) 

    Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.userFirebaseID).child(Model.sharedInstance.userFirebaseID).setValue(info) 

    // uygulama kapatıldıgında remove olsun diye 

    Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).child(Model.sharedInstance.userFirebaseID).onDisconnectRemoveValue() 
    Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).child("userSayisi").onDisconnectRemoveValue() 



    Model.sharedInstance.handleCreateRoom = Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).observeEventType(.Value, withBlock: { (snapshot) in 

     print("SnapCount: \(snapshot.childrenCount)") 

     // usersayısı ve 1 kullanıcı ile snap sayısı 2 oluyor 1 kullanıcı için 

     if snapshot.childrenCount == 3 { 

      print("Game Start") 




      Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).removeObserverWithHandle(Model.sharedInstance.handleCreateRoom) 

      Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).updateChildValues(["userSayisi":2]) 


      let ilkEleman = snapshot.children.allObjects[0] as! FIRDataSnapshot 

      let ikinciEleman = snapshot.children.allObjects[1] as! FIRDataSnapshot 

      let ucuncuEleman = snapshot.children.allObjects[2] as! FIRDataSnapshot 




      print(ucuncuEleman.key) 

      if ilkEleman.key != Model.sharedInstance.userFirebaseID && ilkEleman.key != "userSayisi" { 

       print(ilkEleman.key) 

       dispatch_async(GlobalBackgroundQueue, { 

        Model.sharedInstance.enemyName = ilkEleman.value!["name"] as! String 
        Model.sharedInstance.enemyIQ = ilkEleman.value!["IQ"] as! Int 
        Model.sharedInstance.enemyFirebaseID = ilkEleman.value!["uid"] as! String 
        Model.sharedInstance.enemyPictureUrl = ilkEleman.value!["photoUrl"] as! String 



      Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 




        dispatch_async(GlobalMainQueue, { 

         self.enemyNameLbl.text = Model.sharedInstance.enemyName 
         self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
         self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


        }) 

       }) 




       Model.sharedInstance.delay(2.5, closure: { 
        self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 



       }) 




      } 
      else if ikinciEleman.key != Model.sharedInstance.userFirebaseID && ikinciEleman.key != "userSayisi" { 


       print(ikinciEleman.key) 
       dispatch_async(GlobalBackgroundQueue, { 

        Model.sharedInstance.enemyName = ikinciEleman.value!["name"] as! String 
        Model.sharedInstance.enemyIQ = ikinciEleman.value!["IQ"] as! Int 
        Model.sharedInstance.enemyFirebaseID = ikinciEleman.value!["uid"] as! String 
        Model.sharedInstance.enemyPictureUrl = ikinciEleman.value!["photoUrl"] as! String 



        Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 



        dispatch_async(GlobalMainQueue, { 

         self.enemyNameLbl.text = Model.sharedInstance.enemyName 
         self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
         self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


        }) 

       }) 



       Model.sharedInstance.delay(2.5, closure: { 
        self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 


       }) 

      }else{ 


       print(ikinciEleman.key) 
       dispatch_async(GlobalBackgroundQueue, { 

        Model.sharedInstance.enemyName = ucuncuEleman.value!["name"] as! String 
        Model.sharedInstance.enemyIQ = ucuncuEleman.value!["IQ"] as! Int 
        Model.sharedInstance.enemyFirebaseID = ucuncuEleman.value!["uid"] as! String 
        Model.sharedInstance.enemyPictureUrl = ucuncuEleman.value!["photoUrl"] as! String 



        Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 



        dispatch_async(GlobalMainQueue, { 

         self.enemyNameLbl.text = Model.sharedInstance.enemyName 
         self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
         self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


        }) 

       }) 



       Model.sharedInstance.delay(2.5, closure: { 
        self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 


       }) 


      } 




     }else if snapshot.childrenCount == 2 { 

      print("1 user waiting") 

      Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["userSayisi":1]) 

     } 



    }) { (error) in 
     print(error) 
    } 


}

加入房间代码块：

func joinRoom(){ 

    setPlayerInfo() 



    Model.sharedInstance.quickPlayRoomPerGameRef.queryOrderedByChild("userSayisi").queryEqualToValue(1).queryLimitedToLast(1).observeSingleEventOfType(.Value, withBlock: { (snapshot) in 



     if snapshot.exists(){ 




     let odaAdi = snapshot.children.allObjects[0] as! FIRDataSnapshot 


     Model.sharedInstance.QuickPlayOdaAdi = odaAdi.key 

     let interval = NSDate().timeIntervalSince1970 

     let info = ["photoUrl":Model.sharedInstance.userPictureUrl, 
      "uid":Model.sharedInstance.userFirebaseID, 
      "IQ":Model.sharedInstance.userIQ, 
      "name":Model.sharedInstance.username, 
      "isSiraBende":0, 
      "gizliSayi":Model.sharedInstance.gizliSayi, 
      "isReady":Model.sharedInstance.isReadyForPlaying, 
      "isWin":Model.sharedInstance.isWin, 
      "sonTahminim":Model.sharedInstance.rakipSonTahmini, 
      "date":interval 
     ] 



     Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).child(Model.sharedInstance.userFirebaseID).setValue(info) 

     Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).removeObserverWithHandle(Model.sharedInstance.handleJoinRoom) 

     Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).child(Model.sharedInstance.userFirebaseID).onDisconnectRemoveValue() 
     Model.sharedInstance.quickPlayRoomPerGameRef.child(Model.sharedInstance.QuickPlayOdaAdi).child("userSayisi").onDisconnectRemoveValue() 



     Model.sharedInstance.quickPlayRoomPerGameRef.child(odaAdi.key).observeSingleEventOfType(.Value, withBlock: { (snapshot) in 

      print("SnapCount: \(snapshot.childrenCount)") 



       let ilkEleman = snapshot.children.allObjects[0] as! FIRDataSnapshot 

       let ikinciEleman = snapshot.children.allObjects[1] as! FIRDataSnapshot 

       let ucuncuEleman = snapshot.children.allObjects[2] as! FIRDataSnapshot 





       if ilkEleman.key != Model.sharedInstance.userFirebaseID && ilkEleman.key != "userSayisi" { 

        print(ilkEleman.key) 

        dispatch_async(GlobalBackgroundQueue, { 

         Model.sharedInstance.enemyName = ilkEleman.value!["name"] as! String 
         Model.sharedInstance.enemyIQ = ilkEleman.value!["IQ"] as! Int 
         Model.sharedInstance.enemyFirebaseID = ilkEleman.value!["uid"] as! String 
         Model.sharedInstance.enemyPictureUrl = ilkEleman.value!["photoUrl"] as! String 



         Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 



         dispatch_async(GlobalMainQueue, { 

          self.enemyNameLbl.text = Model.sharedInstance.enemyName 
          self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
          self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


         }) 

        }) 

        Model.sharedInstance.delay(2.5, closure: { 



         self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 


        }) 



       } 
       else if ikinciEleman.key != Model.sharedInstance.userFirebaseID && ikinciEleman.key != "userSayisi"{ 


        print(ikinciEleman.key) 
        dispatch_async(GlobalBackgroundQueue, { 

         Model.sharedInstance.enemyName = ikinciEleman.value!["name"] as! String 
         Model.sharedInstance.enemyIQ = ikinciEleman.value!["IQ"] as! Int 
         Model.sharedInstance.enemyFirebaseID = ikinciEleman.value!["uid"] as! String 
         Model.sharedInstance.enemyPictureUrl = ikinciEleman.value!["photoUrl"] as! String 



         Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 


         dispatch_async(GlobalMainQueue, { 

          self.enemyNameLbl.text = Model.sharedInstance.enemyName 
          self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
          self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


         }) 

        }) 

        Model.sharedInstance.delay(2.5, closure: { 




         self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 


        }) 

       } 
       else{ 

        print(ucuncuEleman.key) 
        dispatch_async(GlobalBackgroundQueue, { 

         Model.sharedInstance.enemyName = ucuncuEleman.value!["name"] as! String 
         Model.sharedInstance.enemyIQ = ucuncuEleman.value!["IQ"] as! Int 
         Model.sharedInstance.enemyFirebaseID = ucuncuEleman.value!["uid"] as! String 
         Model.sharedInstance.enemyPictureUrl = ucuncuEleman.value!["photoUrl"] as! String 



         Model.sharedInstance.quickPlayChooseGameRef.child(Model.sharedInstance.userFirebaseID).updateChildValues(["isPlay":1]) 


         dispatch_async(GlobalMainQueue, { 

          self.enemyNameLbl.text = Model.sharedInstance.enemyName 
          self.enemyRank.text = "\(Model.sharedInstance.enemyIQ)" 
          self.enemyImage.hnk_setImageFromURL(NSURL(string: Model.sharedInstance.enemyPictureUrl)!) 


         }) 

        }) 

        Model.sharedInstance.delay(2.5, closure: { 




         self.performSegueWithIdentifier(Model.sharedInstance.quickPlayHaneSayisi, sender: self) 


        }) 


       } 







     }) { (error) in 
      print(error) 
     } 




     }else{ 

     self.createRoom() 

     } 


     }) { (error) in 

      print(error) 
    } 

}

你已经在你的问题中包含了JSON树的图片。请用实际的JSON替换为文本，您可以通过点击Firebase数据库控制台中的导出按钮轻松获取。将JSON作为文本可以搜索，使我们能够轻松使用它来测试您的实际数据，并将其用于我们的答案中，并且通常只是一件好事。如果您添加显示您已经尝试过的代码，这也会有所帮助。即使你无法正常工作，它也能说明你正在努力完成什么，以及你已经尝试过哪些工作。 –

@FrankvanPuffelen我更新了我的问题，谢谢你的回答。 –

你有没有试过通过一个带有childCount条件的'if'块来迭代？ – Dravidian

答

这是可能的e来处理您的安全规则，但您必须稍微更改您的数据库结构。相反的，你现在有什么，你所要做的财产以后这样的：

"QuickPlay3hanePlaying" : { 
    "ByVmFbUC6HS01v4SASeA2ev33zz1" : { 
    "Player1" : { 
     "3s6TdUxImrNhMReJbS8kBh4I9im1" : { 
     "IQ" : 1350, 
     ... 
     "uid" : "3s6TdUxImrNhMReJbS8kBh4I9im1" 
     }, 
    }, 
    "Player2" : { 
     "ByVmFbUC6HS01v4SASeA2ev33zz1" : { 
     "IQ" : 1280, 
     ... 
     "uid" : "ByVmFbUC6HS01v4SASeA2ev33zz1" 
     }, 
    }, 
    "userSayisi" : 2 
    }

和你的安全规则是这样的：

{ 
"rules": { 
    "QuickPlay3hanePlaying": { 
    "$id": { 
     "player1": {".validate": true}, 
     "player2":{".validate": true}, 
     "userSayisi": {".validate": true}, 
     "$other": {".validate": false} 
     } 
    } 
    } 
}

原因数据库结构的变化，是因为你只能在您的安全规则中的某个位置有1个通配符密钥。

感谢您的回复。 player1正在使用创建房间功能。 player2正在使用联合室功能。所以如果2个不同的用户同时加入房间，所有player2用户都可以加入房间。我想，我必须比较小孩的数量，但我不能在安全规则中得到小孩的数量。谢谢。 –

如何限制使用Firebase中的安全规则的子节点（Swift）

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