iOS的XMPPFramework简单介绍（实现及时通信）

XMPPFramework是一个OS X/iOS平台的开源项目，使用Objective-C实现了XMPP协议（RFC-3920），同时还提供了用于读写XML的工具，大大简化了基于XMPP的通信应用的开发。

1. 登录和好友上下线

1.1XMPP中常用对象们

• XMPPStream：xmpp基础服务类
• XMPPRoster：好友列表类
• XMPPRosterCoreDataStorage：好友列表（用户账号）在core data中的操作类
• XMPPvCardCoreDataStorage：好友名片（昵称，签名，性别，年龄等信息）在core data中的操作类
• XMPPvCardTemp：好友名片实体类，从数据库里取出来的都是它
• xmppvCardAvatarModule：好友头像
• XMPPReconnect：如果失去连接,自动重连
• XMPPRoom：提供多用户聊天支持
• XMPPPubSub：发布订阅

1.2登录操作，也就是连接xmpp服务器

- (void)connect {
  if (self.xmppStream == nil) {
    self.xmppStream = [[XMPPStream alloc] init];
    [self.xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
  }
  if (![self.xmppStream isConnected]) {
    NSString *username = [[NSUserDefaults standardUserDefaults] objectForKey:@"username"];
    XMPPJID *jid = [XMPPJID jidWithUser:username domain:@"lizhen" resource:@"Ework"];
    [self.xmppStream setMyJID:jid];
    [self.xmppStream setHostName:@"10.4.125.113"];
    NSError *error = nil;
    if (![self.xmppStream connect:&error]) {
      NSLog(@"Connect Error: %@", [[error userInfo] description]);
    }
  }
}

connect成功之后会依次调用XMPPStreamDelegate的方法，首先调用

- (void)xmppStream:(XMPPStream *)sender socketDidConnect:(GCDAsyncSocket *)socket

然后

- (void)xmppStreamDidConnect:(XMPPStream *)sender

在该方法下面需要使用xmppStream 的authenticateWithPassword方法进行密码验证，成功的话会响应delegate的方法，就是下面这个

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender

1.3上线

实现 - (void)xmppStreamDidAuthenticate:(XMPPStream *)sender 委托方法

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender {
  XMPPPresence *presence = [XMPPPresence presenceWithType:@"available"];
  [self.xmppStream sendElement:presence];
}

1.4退出并断开连接

- (void)disconnect {
  XMPPPresence *presence = [XMPPPresence presenceWithType:@"unavailable"];
  [self.xmppStream sendElement:presence];

  [self.xmppStream disconnect];
}

1.5好友状态

获取好友状态，通过实现

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence

...

方法，当接收到 presence 标签的内容时，XMPPFramework 框架回调该方法

一个 presence 标签的格式一般如下：

presence 的状态：

• available 上线
• away 离开
• do not disturb 忙碌
• unavailable 下线

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {
  NSString *presenceType = [presence type];
  NSString *presenceFromUser = [[presence from] user];
  if (![presenceFromUser isEqualToString:[[sender myJID] user]]) {
    if ([presenceType isEqualToString:@"available"]) {
      //
    } else if ([presenceType isEqualToString:@"unavailable"]) {
      //
    }
  }
}

2. 接收消息和发送消息

2.1接收消息

当接收到 message 标签的内容时，XMPPFramework 框架回调该方法

根据 XMPP 协议，消息体的内容存储在标签 body 内

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message {
  NSString *messageBody = [[message elementForName:@"body"] stringValue];
}

2.2发送消息
发送消息，我们需要根据 XMPP 协议，将数据放到标签内，例如：

- (void)sendMessage:(NSString *) message toUser:(NSString *) user {
  NSXMLElement *body = [NSXMLElement elementWithName:@"body"];
  [body setStringValue:message];
  NSXMLElement *message = [NSXMLElement elementWithName:@"message"];
  [message addAttributeWithName:@"type" stringValue:@"chat"];
  NSString *to = [NSString stringWithFormat:@"%@@example.com", user];
  [message addAttributeWithName:@"to" stringValue:to];
  [message addChild:body];
  [self.xmppStream sendElement:message];
}

3. 获取好友信息和删除好友

3.1好友列表和好友名片

[_xmppRoster fetchRoster];//获取好友列表
//获取到一个好友节点
- (void)xmppRoster:(XMPPRoster *)sender didRecieveRosterItem:(NSXMLElement *)item
//获取完好友列表
- (void)xmppRosterDidEndPopulating:(XMPPRoster *)sender
//到服务器上请求联系人名片信息
- (void)fetchvCardTempForJID:(XMPPJID *)jid;
//请求联系人的名片，如果数据库有就不请求，没有就发送名片请求
- (void)fetchvCardTempForJID:(XMPPJID *)jid ignoreStorage:(BOOL)ignoreStorage;
//获取联系人的名片，如果数据库有就返回，没有返回空，并到服务器上抓取
- (XMPPvCardTemp *)vCardTempForJID:(XMPPJID *)jid shouldFetch:(BOOL)shouldFetch;
//更新自己的名片信息
- (void)updateMyvCardTemp:(XMPPvCardTemp *)vCardTemp;
//获取到一盒联系人的名片信息的回调
- (void)xmppvCardTempModule:(XMPPvCardTempModule *)vCardTempModule
    didReceivevCardTemp:(XMPPvCardTemp *)vCardTemp
           forJID:(XMPPJID *)jid

3.2添加好友

 //name为用户账号
  - (void)XMPPAddFriendSubscribe:(NSString *)name
  {
    //XMPPHOST 就是服务器名， 主机名
    XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]];
    //[presence addAttributeWithName:@"subscription" stringValue:@"好友"];
    [xmppRoster subscribePresenceToUser:jid];

  }

3.3收到添加好友的请求

 - (void)xmppRoster:(XMPPRoster *)sender didReceivePresenceSubscriptionRequest:(XMPPPresence *)presence
  {
    //取得好友状态
    NSString *presenceType = [NSString stringWithFormat:@"%@", [presence type]]; //online/offline
    //请求的用户
    NSString *presenceFromUser =[NSString stringWithFormat:@"%@", [[presence from] user]];
    NSLog(@"presenceType:%@",presenceType);

    NSLog(@"presence2:%@ sender2:%@",presence,sender);

    XMPPJID *jid = [XMPPJID jidWithString:presenceFromUser];
    //接收添加好友请求
    [xmppRoster acceptPresenceSubscriptionRequestFrom:jid andAddToRoster:YES];

  }

3.4删除好友

//删除好友，name为好友账号
- (void)removeBuddy:(NSString *)name
{
  XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]]; 

  [self xmppRoster] removeUser:jid];
}

4. 聊天室

初始化聊天室

XMPPJID *roomJID = [XMPPJID jidWithString:ROOM_JID];

  xmppRoom = [[XMPPRoom alloc] initWithRoomStorage:self jid:roomJID];

  [xmppRoom activate:xmppStream];
  [xmppRoom addDelegate:self delegateQueue:dispatch_get_main_queue()];

创建聊天室成功

- (void)xmppRoomDidCreate:(XMPPRoom *)sender
  {
    DDLogInfo(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

加入聊天室，使用昵称

 [xmppRoom joinRoomUsingNickname:@"quack" history:nil];

获取聊天室信息

  - (void)xmppRoomDidJoin:(XMPPRoom *)sender
  {
    [xmppRoom fetchConfigurationForm];
    [xmppRoom fetchBanList];
    [xmppRoom fetchMembersList];
    [xmppRoom fetchModeratorsList];
  }

如果房间存在，会调用委托

 // 收到禁止名单列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchBanList:(NSArray *)items;
  // 收到好友名单列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchMembersList:(NSArray *)items;
  // 收到主持人名单列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchModeratorsList:(NSArray *)items;

房间不存在，调用委托

 - (void)xmppRoom:(XMPPRoom *)sender didNotFetchBanList:(XMPPIQ *)iqError;
  - (void)xmppRoom:(XMPPRoom *)sender didNotFetchMembersList:(XMPPIQ *)iqError;
  - (void)xmppRoom:(XMPPRoom *)sender didNotFetchModeratorsList:(XMPPIQ *)iqError;

离开房间

[xmppRoom deactivate:xmppStream];

XMPPRoomDelegate的其他代理方法:

离开聊天室

 - (void)xmppRoomDidLeave:(XMPPRoom *)sender
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

新人加入群聊

 - (void)xmppRoom:(XMPPRoom *)sender occupantDidJoin:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

有人退出群聊

 - (void)xmppRoom:(XMPPRoom *)sender occupantDidLeave:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

有人在群里发言

 - (void)xmppRoom:(XMPPRoom *)sender didReceiveMessage:(XMPPMessage *)message fromOccupant:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

5. 消息回执

这个是XEP－0184协议的内容。协议内容：

发送消息时附加回执请求

代码实现

NSString *siID = [XMPPStream generateUUID];
  //发送消息
  XMPPMessage *message = [XMPPMessage messageWithType:@"chat" to:jid elementID:siID];
  NSXMLElement *receipt = [NSXMLElement elementWithName:@"request" xmlns:@"urn:xmpp:receipts"];
  [message addChild:receipt];
  [message addBody:@"测试"];
  [self.xmppStream sendElement:message];

收到回执请求的消息，发送回执

代码实现

 - (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
  {
    //回执判断
    NSXMLElement *request = [message elementForName:@"request"];
    if (request)
    {
      if ([request.xmlns isEqualToString:@"urn:xmpp:receipts"])//消息回执
      {
        //组装消息回执
        XMPPMessage *msg = [XMPPMessage messageWithType:[message attributeStringValueForName:@"type"] to:message.from elementID:[message attributeStringValueForName:@"id"]];
        NSXMLElement *recieved = [NSXMLElement elementWithName:@"received" xmlns:@"urn:xmpp:receipts"];
        [msg addChild:recieved];

        //发送回执
        [self.xmppStream sendElement:msg];
      }
    }else
    {
      NSXMLElement *received = [message elementForName:@"received"];
      if (received)
      {
        if ([received.xmlns isEqualToString:@"urn:xmpp:receipts"])//消息回执
        {
          //发送成功
          NSLog(@"message send success!");
        }
      }
    } 

    //消息处理
    //...
  }

6. 添加AutoPing

为了监听服务器是否有效，增加心跳监听。用XEP-0199协议，在XMPPFrameWork框架下，封装了 XMPPAutoPing 和 XMPPPing两个类都可以使用，因为XMPPAutoPing已经组合进了XMPPPing类，所以XMPPAutoPing使用起来更方便。

//初始化并启动ping
-(void)autoPingProxyServer:(NSString*)strProxyServer
{
  _xmppAutoPing = [[XMPPAutoPingalloc] init];
  [_xmppAutoPingactivate:_xmppStream];
  [_xmppAutoPingaddDelegate:selfdelegateQueue: dispatch_get_main_queue()];
  _xmppAutoPing.respondsToQueries = YES;
  _xmppAutoPing.pingInterval=2;//ping 间隔时间
  if (nil != strProxyServer)
  {
    _xmppAutoPing.targetJID = [XMPPJID jidWithString: strProxyServer ];//设置ping目标服务器，如果为nil,则监听socketstream当前连接上的那个服务器
  }
}
//卸载监听
 [_xmppAutoPing  deactivate];
 [_xmppAutoPing  removeDelegate:self];
  _xmppAutoPing = nil;
//ping XMPPAutoPingDelegate的委托方法:
- (void)xmppAutoPingDidSendPing:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidSendPing:(XMPPAutoPing *)sender");
}
- (void)xmppAutoPingDidReceivePong:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidReceivePong:(XMPPAutoPing *)sender");
}

- (void)xmppAutoPingDidTimeout:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidTimeout:(XMPPAutoPing *)sender");
}

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