Question

我正在制作匿名聊天应用，需要大量的视图控制器和聊天室。所以，我想知道如何使用Security and Rules页面在firebase中实现Rooms。如果我想设置多个房间，那么代码在我的聊天视图控制器中会是什么呢？

我已经查看了firebase中的IOS文档，但它对我来说并不是很有意义。

这是我的ChatViewController以供进一步参考。

class ChatViewController: JSQMessagesViewController {

// MARK: Properties
var messages = [JSQMessage]() // messages is an array to store the various instances of JSQMessage

var outgoingBubbleImageView: JSQMessagesBubbleImage!
var incomingBubbleImageView: JSQMessagesBubbleImage!

// MARK: Firebase refs
// In case you’re wondering, creating another reference doesn’t mean you’re creating another connection. Every reference shares the same connection to the same Firebase database.
let rootRef = Firebase(url: BASE_URL)
var messageRef = Firebase()

var userIsTypingRef: Firebase! // reference that tracks whether the local user is typing
var usersTypingQuery: FQuery!  // FQuery, which is just like a Firebase reference, except that it’s ordered by an order function.

// Typing tracking related properties
private var localTyping = false // Store whether the local user is typing in a private property
var isTyping: Bool {
    get {
        return localTyping
    }
    set {
        // Using a computed property, update userIsTypingRef each time user updates this property.
        localTyping = newValue
        userIsTypingRef.setValue(newValue)
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    title = "Main Chat!!"
    setupBubbles()

    // No avatars
    collectionView!.collectionViewLayout.incomingAvatarViewSize = CGSizeZero
    collectionView!.collectionViewLayout.outgoingAvatarViewSize = CGSizeZero

    messageRef = rootRef.childByAppendingPath("messages")
}


override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    self.observeMessages()
    self.observeTyping()
}


override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)

    messageRef.removeAllObservers()
}


private func setupBubbles() {
    // JSQMessagesBubbleImageFactory has methods that create the images for the chat bubbles. There’s even a category provided by JSQMessagesViewController that creates the message bubble colors used in the native Messages app.
    let factory = JSQMessagesBubbleImageFactory()
    outgoingBubbleImageView = factory.outgoingMessagesBubbleImageWithColor(UIColor.jsq_messageBubbleBlueColor())
    incomingBubbleImageView = factory.incomingMessagesBubbleImageWithColor(UIColor.jsq_messageBubbleLightGrayColor())
}


// MARK: JSQMessagesCollectionView Datasource    
override func collectionView(collectionView: UICollectionView,
    numberOfItemsInSection section: Int) -> Int {
        return messages.count
}

override func collectionView(collectionView: JSQMessagesCollectionView!,
    messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
        return messages[indexPath.item]
}

override func collectionView(collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageBubbleImageDataSource! {

    let message = messages[indexPath.item] // retrieve the message based on the NSIndexPath item.
    if message.senderId == senderId { // Check if the message was sent by the local user. If so, return the outgoing image view.
        return outgoingBubbleImageView
    } else {  // If the message was not sent by the local user, return the incoming image view.
        return incomingBubbleImageView
    }
}

// set text color based on who is sending the messages
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = super.collectionView(collectionView, cellForItemAtIndexPath: indexPath) as! JSQMessagesCollectionViewCell

    let message = messages[indexPath.item]

    if message.senderId == senderId {
        cell.textView!.textColor = UIColor.whiteColor()
    } else {
        cell.textView?.textColor = UIColor.blackColor()
    }


    return cell
}



// remove avatar support and close the gap where the avatars would normally get displayed.
override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
    return nil
}


// MARK: - Create Message
// This helper method creates a new JSQMessage with a blank displayName and adds it to the data source.
func addMessage(id: String, text: String) {
    let message = JSQMessage(senderId: id, displayName: "", text: text)
    messages.append(message)
}

// SEND button pressed
override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: NSDate!) {

    let itemRef = messageRef.childByAutoId() // Using childByAutoId(), you create a child reference with a unique key.
    // Create a dictionary to represent the message. A [String: AnyObject] works as a JSON-like object
    let messageItem = ["text": text, "senderId": senderId]

    itemRef.setValue(messageItem) // Save the value at the new child location.

    // Play the canonical “message sent” sound.
    JSQSystemSoundPlayer.jsq_playMessageSentSound()

    // Complete the “send” action and reset the input toolbar to empty.
    finishSendingMessage()

}

// Observer logic
private func observeMessages () {

    // Start by creating a query that limits the synchronization to the last 25 messages.
    let messagesQuery = messageRef.queryLimitedToLast(25)

    // Use the .ChildAdded event to observe for every child item that has been added, and will be added, at the messages location.
    messagesQuery.observeEventType(FEventType.ChildAdded) { (snapshot:FDataSnapshot!) -> Void in

        // Extract the senderId and text from snapshot.value.

        if let id = snapshot.value["senderId"] as? String, text = snapshot.value["text"] as? String {

            // Call addMessage() to add the new message to the data source.
            self.addMessage(id, text: text)

            // Inform JSQMessagesViewController that a message has been received.
            self.finishReceivingMessage()

        }

    }

}

// observer user typing object from Firebase
private func observeTyping() {
    // This method creates a reference to the URL of /typingIndicator, which is where you’ll update the typing status of the user. You don’t want this data to linger around after users have logged out, so you can delete it once the user has left using onDisconnectRemoveValue().

    let typingIndicatorRef = rootRef.childByAppendingPath("typingIndicator")
    userIsTypingRef = typingIndicatorRef.childByAppendingPath(senderId)
    userIsTypingRef.onDisconnectRemoveValue()


    // initialize the query by retrieving all users who are typing. This is basically saying, “Hey Firebase, go to the key /typingIndicators and get me all users for whom the value is true.”
    usersTypingQuery = typingIndicatorRef.queryOrderedByValue().queryEqualToValue(true)

    // Observe for changes using .Value; this will give you an update anytime anything changes.
    usersTypingQuery.observeEventType(FEventType.Value) { (data:FDataSnapshot!) -> Void in

        // You're the only typing, don't show the indicator
        if data.childrenCount == 1 && self.isTyping {
            return
        }

        // Are there others typing?
        self.showTypingIndicator = data.childrenCount > 0
        self.scrollToBottomAnimated(true)
    }


}



// Mark: textView delegate
override func textViewDidChange(textView: UITextView) {
    super.textViewDidChange(textView)

    // If the text is not empty, the user is typing
     isTyping = textView.text != ""

}



}

Answer 1

我将回答第一个问题：是的，您可以使用“安全和规则”页面在firebase中实现Rooms。除了聊天（Room）节点之外，您还必须使用roomMembers设置节点。然后，聊天室的安全性和规则将是：

     "Chat": {
    "$room_id": {
      // the list of messages for a room can be read by any member
      ".read": "root.child('RoomMembers/'+$room_id+'/'+auth.uid).exists()",
       "$message_id": {
         // a new message can be created if it does not exist, but it
         // cannot be modified or deleted
         // any member of a room can write a new message
         ".write": "root.child('RoomMembers/'+$room_id+'/'+auth.uid).exists() && !data.exists() && newData.exists()"
       }
    }
  },

会员的安全和规则将是：

      "RoomMembers": {
    // if the list doesn't exist, anybody can create it
    // if it already exists, only users already in the list may modify it
    ".write": "!data.exists()",
    "$room_id": {
         // any member can read the list of member names
         ".read": "data.child(auth.uid).exists()",
         ".write": "!data.exists() || data.hasChild(auth.uid)"
     },
     // any logged in user can get a list of room names
    ".read": "auth !== null"
  },

我在Firebase网站上找到了大部分内容：https://www.firebase.com/docs/security/guide/user-security.html 这里是StackOverflow：Firebase Security rules for an app with multiple chat rooms

完整（仅适用于Chat和RoomMembers部分）：

{
"rules": {
  "Chat": {
    "$room_id": {
      // the list of messages for a room can be read by any member
      ".read": "root.child('RoomMembers/'+$room_id+'/'+auth.uid).exists()",
      //".write": true,
       "$message_id": {
         // a new message can be created if it does not exist, but it
         // cannot be modified or deleted
         // any member of a room can write a new message
         ".write": "root.child('RoomMembers/'+$room_id+'/'+auth.uid).exists() && !data.exists() && newData.exists()"
       }
    }
  },
  "RoomMembers": {
    // if the list doesn't exist, anybody can create it
    // if it already exists, only users already in the list may modify it
    ".write": "!data.exists()",
    "$room_id": {
         // any member can read the list of member names
         ".read": "data.child(auth.uid).exists()",
         ".write": "!data.exists() || data.hasChild(auth.uid)"
     },
     // any logged in user can get a list of room names
    ".read": "auth !== null"
   }
  }
}

希望有所帮助。

如何在此Firebase Swift Chat应用中添加多个房间

1 个答案: