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  • XMPP integration using iOS sdks

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    If you want to add chat functionality in your iOS app . Then this blog can help you to do some basic chat functionality. Such as creating xmpp session , login on sever, creating room, getting list of login buddies and chatting.

    First step download the XMPP framework from the following link :

    https://github.com/robbiehanson/XMPPFramework

    call this function to start and setup xmpp stream

        -(void)startXMPP:(id)viewController{
        [DDLog addLogger:[DDTTYLogger sharedInstance]];
    
        // Setup the XMPP stream
        NSLog(@"XMPP new method called");
          self.delegate=viewController;
        [self setupStream];
        if (![self connect])
        {
            dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.0 * NSEC_PER_SEC);
            dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    
            });
        }
    
    }
    
    
    - (void)setupStream
    {
        NSAssert(xmppStream == nil, @"Method setupStream invoked multiple times");
    
        // Setup xmpp stream
        //
        // The XMPPStream is the base class for all activity.
        // Everything else plugs into the xmppStream, such as modules/extensions and delegates.
    
        xmppStream = [[XMPPStream alloc] init];
    
    #if !TARGET_IPHONE_SIMULATOR
        {
            // Want xmpp to run in the background?
            //
            // P.S. - The simulator doesn't support backgrounding yet.
            //        When you try to set the associated property on the simulator, it simply fails.
            //        And when you background an app on the simulator,
            //        it just queues network traffic til the app is foregrounded again.
            //        We are patiently waiting for a fix from Apple.
            //        If you do enableBackgroundingOnSocket on the simulator,
            //        you will simply see an error message from the xmpp stack when it fails to set the property.
    
            xmppStream.enableBackgroundingOnSocket = YES;
        }
    #endif
    
        // Setup reconnect
        //
        // The XMPPReconnect module monitors for "accidental disconnections" and
        // automatically reconnects the stream for you.
        // There's a bunch more information in the XMPPReconnect header file.
    
        xmppReconnect = [[XMPPReconnect alloc] init];
    
        // Setup roster
        //
        // The XMPPRoster handles the xmpp protocol stuff related to the roster.
        // The storage for the roster is abstracted.
        // So you can use any storage mechanism you want.
        // You can store it all in memory, or use core data and store it on disk, or use core data with an in-memory store,
        // or setup your own using raw SQLite, or create your own storage mechanism.
        // You can do it however you like! It's your application.
        // But you do need to provide the roster with some storage facility.
    
        xmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] init];
        //    xmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] initWithInMemoryStore];
    
        xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterStorage];
    
        xmppRoster.autoFetchRoster = YES;
        xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = YES;
    
        // Setup vCard support
        //
        // The vCard Avatar module works in conjuction with the standard vCard Temp module to download user avatars.
        // The XMPPRoster will automatically integrate with XMPPvCardAvatarModule to cache roster photos in the roster.
    
        xmppvCardStorage = [XMPPvCardCoreDataStorage sharedInstance];
        xmppvCardTempModule = [[XMPPvCardTempModule alloc] initWithvCardStorage:xmppvCardStorage];
    
        xmppvCardAvatarModule = [[XMPPvCardAvatarModule alloc] initWithvCardTempModule:xmppvCardTempModule];
    
        // Setup capabilities
        //
        // The XMPPCapabilities module handles all the complex hashing of the caps protocol (XEP-0115).
        // Basically, when other clients broadcast their presence on the network
        // they include information about what capabilities their client supports (audio, video, file transfer, etc).
        // But as you can imagine, this list starts to get pretty big.
        // This is where the hashing stuff comes into play.
        // Most people running the same version of the same client are going to have the same list of capabilities.
        // So the protocol defines a standardized way to hash the list of capabilities.
        // Clients then broadcast the tiny hash instead of the big list.
        // The XMPPCapabilities protocol automatically handles figuring out what these hashes mean,
        // and also persistently storing the hashes so lookups aren't needed in the future.
        //
        // Similarly to the roster, the storage of the module is abstracted.
        // You are strongly encouraged to persist caps information across sessions.
        //
        // The XMPPCapabilitiesCoreDataStorage is an ideal solution.
        // It can also be shared amongst multiple streams to further reduce hash lookups.
    
        xmppCapabilitiesStorage = [XMPPCapabilitiesCoreDataStorage sharedInstance];
        xmppCapabilities = [[XMPPCapabilities alloc] initWithCapabilitiesStorage:xmppCapabilitiesStorage];
    
        xmppCapabilities.autoFetchHashedCapabilities = YES;
        xmppCapabilities.autoFetchNonHashedCapabilities = NO;
    
        // Activate xmpp modules
    
        [xmppReconnect         activate:xmppStream];
        [xmppRoster            activate:xmppStream];
        [xmppvCardTempModule   activate:xmppStream];
        [xmppvCardAvatarModule activate:xmppStream];
        [xmppCapabilities      activate:xmppStream];
    
        // Add ourself as a delegate to anything we may be interested in
    
        [xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
        [xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];
    
        // Optional:
        //
        // Replace me with the proper domain and port.
        // The example below is setup for a typical google talk account.
        //
        // If you don't supply a hostName, then it will be automatically resolved using the JID (below).
        // For example, if you supply a JID like 'user@quack.com/rsrc'
        // then the xmpp framework will follow the xmpp specification, and do a SRV lookup for quack.com.
        //
        // If you don't specify a hostPort, then the default (5222) will be used.
    
        //    [xmppStream setHostName:@"talk.google.com"];
        //    [xmppStream setHostPort:5222];
    
    
        // You may need to alter these settings depending on the server you're connecting to
        allowSelfSignedCertificates = NO;
        allowSSLHostNameMismatch = NO;
    }
    

    After setting up xmpp stream , login using your user email and password by following method:

    - (void)goOnline
    {
        XMPPPresence *presence = [XMPPPresence presence]; // type="available" is implicit
    
        NSString *domain = [xmppStream.myJID domain];
    
        //Google set their presence priority to 24, so we do the same to be compatible.
    
        if([domain isEqualToString:@"gmail.com"]
           || [domain isEqualToString:@"gtalk.com"]
           || [domain isEqualToString:@"talk.google.com"])
        {
            NSXMLElement *priority = [NSXMLElement elementWithName:@"priority" stringValue:@"24"];
            [presence addChild:priority];
        }
    
        [[self xmppStream] sendElement:presence];
    }
    

    To create the room , use this method :

    -(void)createRoom
    {
        NSLog(@"creating room");
    
        XMPPJID *roomJID = [XMPPJID jidWithString:@"jitu@conference.umekir.com"];
    
        XMPPRoomMemoryStorage *roomMemoryStorage = [[XMPPRoomMemoryStorage alloc] init];
    
        XMPPRoom *xmppRoom = [[XMPPRoom alloc] initWithRoomStorage:roomMemoryStorage
                                                               jid:roomJID
                                                     dispatchQueue:dispatch_get_main_queue()];
    
        [xmppRoom activate:self.xmppStream];
        [xmppRoom addDelegate:self delegateQueue:dispatch_get_main_queue()];
        [xmppRoom joinRoomUsingNickname:[[NSUserDefaults standardUserDefaults] stringForKey:@"email"] history:nil];
    
    
    }
    

    Following are delegates method of XMPPRoomDelegate

    - (void)xmppRoomDidCreate:(XMPPRoom *)sender{
        NSLog(@"able to create the room==%@",sender);
        DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
    }
    
    - (void)xmppRoomDidJoin:(XMPPRoom *)sender{
        NSLog(@"able to join the room==%@",sender);
        DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
    
    }
    

    Following method will give the status of online or offline user. As the user will get online/offline following method will called up

    - (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence
    {
    
        NSLog(@"notfication for presence");
    
        NSString *presenceType = [presence type];
        NSLog(@"presence type==%@",presenceType);// online/offline
        [self parsingpresence:[presence fromStr] :presenceType];
    }
    -(void)parsingpresence:(NSString*)emailidwithRoom :(NSString*)status
    {
    
        NSArray *tmp=[emailidwithRoom componentsSeparatedByString:@"/"];
        if(tmp.count>0)
        {
            NSString *emailid=[tmp objectAtIndex:1];
            NSLog(@"emailid==%@",emailid);
            NSUserDefaults *usrdef=[NSUserDefaults standardUserDefaults];
            [usrdef valueForKey:@"kXMPPmyJID"];
            if(![emailid isEqualToString:[usrdef valueForKey:@"kXMPPmyJID"]] && [status isEqualToString:@"available"]){
                [[NSNotificationCenter defaultCenter] postNotificationName:@"ReadPresenceNotification" object:emailid];
            } else {
                [[NSNotificationCenter defaultCenter] postNotificationName:@"ReadRemoveNotification" object:emailid];
            }
        }
    
    
    }
    

    To send the message to buddy, pass buddy email id to the following function and message

    - (void)sendChatMessage :(NSString*)messageStr :(NSString*)frndemailid{
    
       // NSString *messageStr = @"hello how r u";
    
        if([messageStr length] > 0) {
    
            NSXMLElement *body = [NSXMLElement elementWithName:@"body"];
            [body setStringValue:messageStr];
    
            NSXMLElement *message = [NSXMLElement elementWithName:@"message"];
            [message addAttributeWithName:@"type" stringValue:@"chat"];
            [message addAttributeWithName:@"to" stringValue:frndemailid];
    
            [message addChild:body];
    
            [self.xmppStream sendElement:message];
    
    
        }
    }
    

    I have attached the source code of sample application . Enjoy chatting :)

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