Question

I’m trying to add a new buddy to the user’s roster using this line of code:

XMPPJID jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@localhost",
                                      addBuddyTextField.text]];
[appDelegate.xmppRoster addUser:jid withNickname:addBuddyTextField.text];

This works. The other users gets the subscription request notice, he can accept it and everything works fine. The new buddy will be added into the XMPPRosterMemoryStorage and will show on the [XMPPRosterMemoryStorage unsortedUsers] NSArray so that the current roster with all his buddys can be presented on the UI.

But once the users logs out and restarts the application the whole roster is gone, with all his buddys he added. [XMPPRoster fetchRoster] and the following method [XMPPRosterMemoryStorage unsortedUsers] return an NSArray with no items in it.

Do I have to post the buddy update (add, removal) to the XMPPServer? Or is Roster not supported by my XMPPserver (ejabberd)?

Here’s the code I use to activate XMPPRoster:

xmppRosterMemStorage = [[XMPPRosterMemoryStorage alloc] init];
xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterMemStorage
                                         dispatchQueue:dispatch_get_main_queue()];
[xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];
xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = false;
xmppRoster.autoFetchRoster = true;
[xmppRoster activate:xmppStream];
[xmppRoster fetchRoster];

Answer 1

From the discussion above, it sounds like your server is getting your roster requests just fine. Using your setup code I can’t reproduce the problem you’re having.

You could try turning on logging and seeing if reading the protocol log helps you understand what’s happening:

#import "DDTTYLogger.h"

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    [DDLog addLogger:[DDTTYLogger sharedInstance]];

    ...

Or try my test code with your server, and if the problem goes away, start working from there:

#import "AppDelegate.h"
#import "XMPPFramework.h"
#import "DDTTYLogger.h"
#import "DDLog.h"

static const int ddLogLevel = LOG_LEVEL_VERBOSE;

NSString * const XMPPAuthenticationMethodPlain = @"Plain";
NSString * const XMPPAuthenticationMethodDigestMD5 = @"Digest-MD5";

NSString * const OptionHostName = @"...";
NSUInteger const OptionPort = 5222;
BOOL const OptionOldSchoolSSL = NO;
NSString * const OptionJID = @"...";
NSString * const OptionAuthenticationMethod = @"Digest-MD5";
NSString * const OptionPassword = @"...";

@interface AppDelegate () <XMPPStreamDelegate, XMPPRosterMemoryStorageDelegate>

@property (retain) XMPPStream *xmppStream;
@property (retain) XMPPRosterMemoryStorage *xmppRosterMemStorage;
@property (retain) XMPPRoster *xmppRoster;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    [DDLog addLogger:[DDTTYLogger sharedInstance]];

    self.xmppStream = [[XMPPStream alloc] init];
    [self.xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
    self.xmppStream.hostName = OptionHostName;
    self.xmppStream.hostPort = OptionPort;
    self.xmppStream.myJID = [XMPPJID jidWithString:OptionJID];

    self.xmppRosterMemStorage = [[XMPPRosterMemoryStorage alloc] init];
    self.xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:self.xmppRosterMemStorage
                                             dispatchQueue:dispatch_get_main_queue()];
    [self.xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];
    [self.xmppRoster activate:self.xmppStream];

    NSError *error = nil;
    if (OptionOldSchoolSSL)
        [self.xmppStream oldSchoolSecureConnect:&error];
    else
        [self.xmppStream connect:&error];
}

-(void)applicationWillTerminate:(NSNotification *)notification {
    [self.xmppStream removeDelegate:self];
    [self.xmppStream disconnect];
}

-(void)xmppStreamDidConnect:(XMPPStream *)sender {
    Class authClass = nil;
    if ([OptionAuthenticationMethod isEqual:XMPPAuthenticationMethodPlain])
        authClass = [XMPPPlainAuthentication class];
    else if ([OptionAuthenticationMethod isEqual:XMPPAuthenticationMethodDigestMD5])
        authClass = [XMPPDigestMD5Authentication class];
    else {
        DDLogWarn(@"Unrecognized auhthentication method '%@', falling back on Plain",
                  OptionAuthenticationMethod);
        authClass = [XMPPPlainAuthentication class];
    }
    id<XMPPSASLAuthentication> auth = [[authClass alloc] initWithStream:sender
                                                               password:OptionPassword];
    NSError *error = nil;
    if (![sender authenticate:auth error:&error])
        NSLog(@"Error authenticating: %@", error);
}

-(void)xmppRosterDidPopulate:(XMPPRosterMemoryStorage *)sender {
    NSLog(@"users: %@", [sender unsortedUsers]);
    // My subscribed users do print out
}

@end

It also works if I move the roster setup code to -xmppStreamDidAuthenticate, however I do need to manually invoke -fetchRoster in that case.