基于 XMPP协议的服务器端 文件互传的简单实现

基于 XMPP协议的服务器端 文件互传的简单实现

         昨天我们讲了客户端实现用户互发消息的原理,今天我们继续学习一下基于XMPP协议的文件传输,首先我们假设用户已经登录,这里我们假设Clinet Send对Clinet Receive 发送文件,这里记录了Clinet Send的发送和接收XML流记录

1、发送请求表示要向Clinet test发送文件，并发送文件大小和文件名

SEND: <iq xmlns="jabber:client" id="agsXMPP_6" to="Receive @localhost/" type="set"><si xmlns="http://jabber.org/protocol/si" profile="http://jabber.org/protocol/si/profile/file-transfer" id="b3b5f49c-8a94-49e2-908a-3de694b98af0"><file xmlns="http://jabber.org/protocol/si/profile/file-transfer" name="MiniClient.exe.config" size="382"><range /></file><feature xmlns="http://jabber.org/protocol/feature-neg"><x xmlns="jabber:x:data" type="form"><field type="list-single" var="stream-method"><option><value>http://jabber.org/protocol/byReceive reams</value></option></field></x></feature></si></iq>

2、Receive 收到Send发实来的请求后,发送出响应流

RECV: <iq xmlns="jabber:client" to="Send@localhost" type="result" id="agsXMPP_6"><si xmlns="http://jabber.org/protocol/si" id="b3b5f49c-8a94-49e2-908a-3de694b98af0"><feature xmlns="http://jabber.org/protocol/feature-neg"><x xmlns="jabber:x:data" type="submit"><field var="stream-method"><value>http://jabber.org/protocol/byReceive reams</value></field></x></feature></si></iq>

3、Send收到Receive 愿意接收的响应后，发出如下XML流

SEND: <iq xmlns="jabber:client" id="agsXMPP_7" to="Receive@localhost" type="set"><query xmlns="http://jabber.org/protocol/bySendreams" sid="71f1b875-4d84-429c-b39d-7dabcd400f3d"><streamhost jid="Send@localhost/MiniClient" host="localhost" port="1000" /><streamhost jid="proxy.ag-software.de" host="proxy.ag-software.de" port="7777" /></query></iq>

注意这里注要是代理的设置，agsXMPP 自带的客户端是使用代理传输数据的,所以必须对其做相应的修改,使其支持局域网内支持发送文件.

下面我们来看一下服务器端是如何路由消息的呢？
从上面所发送的XML流我们可以看出，实际上用户传送文件所发送的都是IQ节，我们必须对IQ节进行路由才能使其找到相应的接收者 ,所以我们需要在XmppServerConnection类中添加如下代码:
 

private void ProcessIQ(IQ iq)
        {
//传送文件得理
  if (iq.Query == null)
            {
                if(iq.Type == IqType.result)
                    this.Send(iq);
                ProcessOobIQ(iq);
            }
            else
            if (iq.Query.GetType() == typeof(Auth))
            {
                Auth auth = iq.Query as Auth;
                this.Username = auth.Username.ToString();

                switch (iq.Type)
                {
                    case IqType.get:
                        iq.SwitchDirection();
                        iq.Type = IqType.result;
                        auth.AddChild(new Element("password"));
                        auth.AddChild(new Element("digest"));
                        Send(iq);
                        break;
                    case IqType.set:
                        // Here we should verify the authentication credentials
                        if (AccountBus.CheckLogin(auth.Username, auth.Digest, this.SessionId))
                        {
                            iq.SwitchDirection();
                            iq.Type = IqType.result;
                            iq.Query = null;
                            Send(iq);
                            Console.WriteLine(auth.Username + "登录了" + "   登录时间:" + System.DateTime.Now.ToString());
                        }
                        else
                        {
                          //  iq.SwitchDirection();
                            iq.Type = IqType.error;
                            iq.Query = null;
                            Send(iq);
                        }
                        break;
                }

            }
            else if (iq.Query.GetType() == typeof(Roster))
            {
                ProcessRosterIQ(iq);
            }//用代理传送文件处理
            else if(iq.Query.FirstChild !=null)
            {
               // iq.SwitchDirection();
               // //iq.Type = IqType.result;
               // //Send(iq);
               // iq.Type = IqType.set;
                //this.Send(iq);
                ProcessOobIQ(iq);
            }

}

传送文件载图: