ios - 无法创建 xmpp muc 房间 : Code 503 (service unavailable)

Question

我创建房间的代码:

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()];

调试:

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:

我看到它正在创建/加入 groupchat@xmpp.getkismet.com 而不是我指定的 groupchat@xmpp.getkismet.com/groupchat。我读到这很可能是问题所在。但是，我已经指定了完整的 jid，所以我迷路了。

提前感谢所有提供帮助的人。

Answer 1

首先，看这里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，请向您的 Jabber 服务器发送下一个命令:

<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>

或者使用 XMPP 库函数在 objective-c 中编写:

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(delegate)中监听来自服务器的响应 - (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq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 objective-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获取其属性，并找出哪个是 session 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>

或者在 objective-c 中:

- (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];
            }
        }
    }
}

监听来自服务器的响应:

<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>

并使用 category:conference 从身份中获取群聊域

- (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，当我们获得群聊域时，我们可以创建这样的聊天室:

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> View Controller 及其委托(delegate)中的协议(protocol):

- (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:在邀请其他用户加入聊天室之前，您必须发送并确认房间配置(可以邀请其他用户，但不能发送消息)。
因此您可以在创建房间(调用委托(delegate)- (void)xmppRoomDidCreate:(XMPPRoom *)sender)或您的用户加入(调用委托(delegate)- (void)xmppRoomDidJoin:(XMPPRoom *)sender)聊天室后执行此操作。

要发送和确认房间配置，请执行以下操作之一:

- (void)xmppRoomDidCreate:(XMPPRoom *)sender
{
    [sender configureRoomUsingOptions:nil];
}

或

- (void)xmppRoomDidJoin:(XMPPRoom *)sender
{    
    [sender configureRoomUsingOptions:nil];
}

发送nil接受默认选项，或者您可以使用以下语法将 IQ 发送到您的服务器:

<iq type='set' from='user@jabber.server.com/resource' id='some_expression' to='chat_room@conference.jabber.server.com'>
    <query xmlns='http://jabber.org/protocol/muc#owner'>
        <x xmlns='jabber:x:data' type='submit'>
            <field var='FORM_TYPE'>
                <value>http://jabber.org/protocol/muc#roomconfig</value>
            </field>
            <field var='muc#roomconfig_roomname'>
                <value>My Chat Room</value>
            </field>
              .
              .
              .
        <x>
</query>
</iq>

或 objective-c 代码:

NSError *error = nil;
NSXMLElement *query = [[NSXMLElement alloc] initWithXMLString:@"<query xmlns='http://jabber.org/protocol/muc#owner'/>" 
                                                        error:&error];
NSXMLElement *x = [NSXMLElement elementWithName:@"x" 
                                          xmlns:@"jabber:x:data"];
[x addAttributeWithName:@"type" stringValue:@"submit"];
NSXMLElement *field1 = [NSXMLElement elementWithName:@"field"];
[field1 addAttributeWithName:@"var" stringValue:@"FORM_TYPE"];
NSXMLElement *value1 = [NSXMLElement elementWithName:@"value" 
                                         stringValue:@"http://jabber.org/protocol/muc#roomconfig"];
[field1 addChild:value1];

NSXMLElement *field2 = [NSXMLElement elementWithName:@"field"];
[field2 addAttributeWithName:@"var" stringValue:@"muc#roomconfig_roomname"];
NSXMLElement *value2 = [NSXMLElement elementWithName:@"value" 
                                         stringValue:@"My Chat Room"];
[field2 addChild:value2];

//Add other fields you need, just like field1 and field2

[x addChild:field1];
[x addChild:field2];

[query addChild:x];

NSXMLElement *roomOptions = [NSXMLElement elementWithName:@"iq"];
[roomOptions addAttributeWithName:@"type" stringValue:@"set"];
[roomOptions addAttributeWithName:@"id" stringValue:[xmppStream generateUUID];
[roomOptions addAttributeWithName:@"to" stringValue:@"chat_room@conference.jabber.server.com"];

[roomOptions addChild:query];

[sender configureRoomUsingOptions:roomOptions];

所有可能的配置表单字段的列表是 here