ios – 无法创建xmpp muc room：代码503(服务不可用)

XMPPRoomCoreDataStorage *rosterstorage = [[XMPPRoomCoreDataStorage alloc] init];
XMPPRoom *xmppRoom = [[XMPPRoom alloc] initWithRoomStorage:rosterstorage jid:[XMPPJID jidWithString:@"groupchat@xmpp.getkismet.com/groupchat"] dispatchQueue:dispatch_get_main_queue()];

[xmppRoom activate:[[self appDelegate] xmppStream]];
if ([xmppRoom preJoinWithNickname:@"nameToCreateRoom"]) 
{
    NSLog(@"room created");
    [xmppRoom joinRoomUsingNickname:self.userName history:nil];
}
[xmppRoom fetchConfigurationForm];
[xmppRoom configureRoomUsingOptions:nil];
[xmppRoom addDelegate:[self appDelegate] delegateQueue:dispatch_get_main_queue()];

2012-08-03 07:46:29.204 iPhoneXMPP[9887:fb03] room created
2012-08-03 07:46:29:230 iPhoneXMPP[9887:15003] SEND: <iq type="get" to="groupchat@xmpp.getkismet.com" id="B793062B-0E09-492F-BC0F-703503AAA664"><query xmlns="http://jabber.org/protocol/muc#owner"/></iq>
2012-08-03 07:46:29:237 iPhoneXMPP[9887:15003] SEND: <iq type="set" to="groupchat@xmpp.getkismet.com" id="392D5BFC-707B-4F68-A829-56F949F4E96D"><query xmlns="http://jabber.org/protocol/muc#owner"><x xmlns="jabber:x:data" type="submit"/></query></iq>
2012-08-03 07:46:29:326 iPhoneXMPP[9887:14f03] SEND: <presence to="groupchat@xmpp.getkismet.com"><x xmlns="http://jabber.org/protocol/muc"/><x xmlns="vcard-temp:x:update"><photo>91217a961321f8f6380ea2feefd0632353ad296c</photo></x><c xmlns="http://jabber.org/protocol/caps" hash="sha-1" node="http://code.google.com/p/xmppframework" ver="VyOFcFX6+YNmKssvXSBKGFP0BS4="/></presence>
2012-08-03 07:46:29:327 iPhoneXMPP[9887:14f03] RECV: <iq xmlns="jabber:client" from="groupchat@xmpp.getkismet.com" to="lee@xmpp.getkismet.com/41068195801343976386548353" type="error" id="B793062B-0E09-492F-BC0F-703503AAA664"><query xmlns="http://jabber.org/protocol/muc#owner"/><error code="503" type="cancel"><service-unavailable xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/></error></iq>
2012-08-03 07:46:29:343 iPhoneXMPP[9887:fb03] iPhoneXMPPAppDelegate: xmppStream:didReceiveIQ:
2012-08-03 07:46:29:421 iPhoneXMPP[9887:15003] RECV: <iq xmlns="jabber:client" from="groupchat@xmpp.getkismet.com" to="lee@xmpp.getkismet.com/41068195801343976386548353" type="error" id="392D5BFC-707B-4F68-A829-56F949F4E96D"><query xmlns="http://jabber.org/protocol/muc#owner"><x xmlns="jabber:x:data" type="submit"/></query><error code="503" type="cancel"><service-unavailable xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/></error></iq>
2012-08-03 07:46:29:440 iPhoneXMPP[9887:fb03] iPhoneXMPPAppDelegate: xmppStream:didReceiveIQ:

首先,请看一下 XEP-0045: Multi-User Chat.如您所见,首先您必须发现您的用户(XMPPJID)在Jabber服务器上具有哪些功能.为此,请将下一个命令发送到您的Jabber服务器：

<iq from='user@jabber.server.com/resource' id='some_expression' to='jabber.server.com' type='get'>
    <query xmlns='http://jabber.org/protocol/disco#items'/>
</iq>

或使用XMPP库函数在objective-c中写入：

NSError *error = nil;
NSXMLElement *query = [[NSXMLElement alloc] initWithXMLString:@"<query xmlns='http://jabber.org/protocol/disco#items'/>" 
                                                        error:&error];
XMPPIQ *iq = [XMPPIQ iqWithType:@"get" 
                             to:[XMPPJID jidWithString:@"jabber.server.com"] 
                      elementID:[xmppStream generateUUID] child:query];
[xmppStream sendElement:iq];

现在在XMPPStream委托中侦听来自服务器的响应 – (BOOL)xmppStream：(XMPPStream *)sender didReceiveIQ：(XMPPIQ *)iq和服务器响应应该是这样的：

<iq from='jabber.server.com' id='some_expression' to='user@jabber.server.com/resource' type='result'>
    <query xmlns='http://jabber.org/protocol/disco#items'>
        <item jid='im.jabber.server.com' name='Instant message service'/>
        <item jid='conference.jabber.server.com' name='Chatroom service'/>
    </query>
</iq>

或目标c：

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{

    if([iq isResultIQ])
    {
        if([iq elementForName:@"query" xmlns:@"http://jabber.org/protocol/disco#items"])
        {
            NSLog(@"Jabber Server's Capabilities: %@",[iq XMLString]);
        }
    }
}

现在,对于返回的每个项目,将IQ发送到您的服务器以@L_675_10@它的属性,并确定哪个是会议类型,如下所示：

<iq from='user@jabber.server.com/resource' id='some_expression' to='conference.jabber.server.com' type='get'>
    <query xmlns='http://jabber.org/protocol/disco#info'/>
</iq>

或在目标c：

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{

    if([iq isResultIQ])
    {
        if([iq elementForName:@"query" xmlns:@"http://jabber.org/protocol/disco#items"])
        {
            NSXMLElement *query = [iq childElement];
            NSArray *items = [query children];
            for(NSXMLElement *item in items)
            {
                NSError *error = nil;
                NSXMLElement *sendQuery = [[NSXMLElement alloc] initWithXMLString:@"<query xmlns='http://jabber.org/protocol/disco#info'/>" 
                                                                            error:&error];
                XMPPIQ *sendIQ = [XMPPIQ iqWithType:@"get" 
                                                 to:[XMPPJID jidWithString:[item attributestringvalueForName:@"jid"]] 
                                          elementID:[xmppStream generateUUID] 
                                              child:sendQuery];
                [xmppStream sendElement:sendIQ];
            }
        }
    }
}

听取服务器的回复：

<iq from='conference.jabber.server.com' id='some_expression' to='user@jabber.server.com/resource' type='result'>
    <query xmlns='http://jabber.org/protocol/disco#info'>
        <identity category='conference' name='Server Group Chat service' type='text'/>
        <feature var='http://jabber.org/protocol/muc'/>
    </query>
</iq>

并从类别：会议中识别群组聊天域名

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{

    if([iq isResultIQ])
    {
        if([iq elementForName:@"query" xmlns:@"http://jabber.org/protocol/disco#items"])
        {
            ...
        }
        else if([iq elementForName:@"query" xmlns:@"http://jabber.org/protocol/disco#info"])
        {
            NSXMLElement *query = [iq childElement];
            NSXMLElement *identity = [query elementForName:@"identity"];
            if([[identity attributestringvalueForName:@"category"] isEqualToString:@"conference"])
            {
                groupChatDomain = [iq fromStr];
            }
        }
    }
}

最后,当我们获得群聊字段时,我们可以创建如下的聊天室：

XMPPJID *chatRoomJID = [XMPPJID jidWithUser:@"chat_room" 
                                     domain:groupChatDomain 
                                   resource:@"user"];
XMPPRoomMemoryStorage *roomMemoryStorage = [[XMPPRoomMemoryStorage alloc] init];
XMPPRoom *xmppRoom = [[XMPPRoom alloc] initWithRoomStorage:roomMemoryStorage
                                                       jid:roomChatJID
                                             dispatchQueue:dispatch_get_main_queue()];
[xmppRoom activate:xmppStream];
[xmppRoom addDelegate:self delegateQueue:dispatch_get_main_queue()];
[xmppRoom joinRoomUsingNickname:user history:nil];

并添加< XMPPRoomDelegate>视图控制器及其委托中的协议：

- (void)xmppRoomDidCreate:(XMPPRoom *)sender
- (void)xmppRoomDidDestroy:(XMPPRoom *)sender
- (void)xmppRoom:(XMPPRoom *)sender didConfigure:(XMPPIQ *)iqResult
- (void)xmppRoom:(XMPPRoom *)sender didNotConfigure:(XMPPIQ *)iqResult
- (void)xmppRoomDidJoin:(XMPPRoom *)sender
- (void)xmppRoomDidLeave:(XMPPRoom *)sender
- (void)xmppRoom:(XMPPRoom *)sender occupantDidJoin:(XMPPJID *)occupantJID withPresence:(XMPPPresence *)presence
- (void)xmppRoom:(XMPPRoom *)sender occupantDidLeave:(XMPPJID *)occupantJID withPresence:(XMPPPresence *)presence
- (void)xmppRoom:(XMPPRoom *)sender didReceivemessage:(XMPPmessage *)message fromOccupant:(XMPPJID *)occupantJID

注意：在邀请其他用户访问聊天室之前,您必须发送并确认房间配置(可以邀请其他用户,但无法发送消息).所以你可以在创建Room之后(委托 – (void)xmppRoomDidCreate