- Update

Extensions/XEP-0224/XMPPAttentionModule.h

@@ -0,0 +1,24 @@
+#import "XMPPModule.h"
+#import "XMPPMessage+XEP_0224.h"
+
+#define _XMPP_ATTENTION_MODULE_H
+
+@interface XMPPAttentionModule : XMPPModule {
+    BOOL respondsToQueries;
+}
+
+/**
+ * Whether or not the module should respond to incoming attention request queries.
+ * It you create multiple instances of this module, only one instance should respond to queries.
+ * 
+ * It is recommended you set this (if needed) before you activate the module.
+ * The default value is YES.
+ **/
+@property (readwrite) BOOL respondsToQueries;
+
+@end
+
+@protocol XMPPAttentionDelegate
+@optional
+- (void)xmppAttention:(XMPPAttentionModule *)sender didReceiveAttentionHeadlineMessage:(XMPPMessage *)attentionRequest;
+@end

Extensions/XEP-0224/XMPPAttentionModule.m

@@ -0,0 +1,127 @@
+#import "XMPPAttentionModule.h"
+
+#if ! __has_feature(objc_arc)
+#warning This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
+#endif
+
+@implementation XMPPAttentionModule
+
+- (id)init
+{
+	return [self initWithDispatchQueue:NULL];
+}
+
+- (id)initWithDispatchQueue:(dispatch_queue_t)queue
+{
+	if ((self = [super initWithDispatchQueue:queue]))
+	{
+		respondsToQueries = YES;
+	}
+	return self;
+}
+
+- (BOOL)activate:(XMPPStream *)aXmppStream
+{
+	if ([super activate:aXmppStream])
+	{
+#ifdef _XMPP_CAPABILITIES_H
+		[xmppStream autoAddDelegate:self delegateQueue:moduleQueue toModulesOfClass:[XMPPCapabilities class]];
+#endif
+		return YES;
+	}
+	
+	return NO;
+}
+
+- (void)deactivate
+{
+#ifdef _XMPP_CAPABILITIES_H
+	[xmppStream removeAutoDelegate:self delegateQueue:moduleQueue fromModulesOfClass:[XMPPCapabilities class]];
+#endif
+	
+	[super deactivate];
+}
+
+- (BOOL)respondsToQueries
+{
+	if (dispatch_get_specific(moduleQueueTag))
+	{
+		return respondsToQueries;
+	}
+	else
+	{
+		__block BOOL result;
+		
+		dispatch_sync(moduleQueue, ^{
+			result = respondsToQueries;
+		});
+		return result;
+	}
+}
+
+- (void)setRespondsToQueries:(BOOL)flag
+{
+	dispatch_block_t block = ^{
+		
+		if (respondsToQueries != flag)
+		{
+			respondsToQueries = flag;
+			
+#ifdef _XMPP_CAPABILITIES_H
+			@autoreleasepool {
+				// Capabilities may have changed, need to notify others.
+				[xmppStream resendMyPresence];
+			}
+#endif
+		}
+	};
+	
+	if (dispatch_get_specific(moduleQueueTag))
+		block();
+	else
+		dispatch_async(moduleQueue, block);
+}
+
+
+- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
+{
+	// This method is invoked on the moduleQueue.
+	
+    // Format of an attention message. Body is optional and not used by clients like Pidgin
+    //    <message from='calvin@usrobots.lit/lab' to='herbie@usrobots.lit/home' type='headline'>
+    //        <attention xmlns='urn:xmpp:attention:0'/>
+    //        <body>Why don't you answer, Herbie?</body>
+    //    </message>
+    
+    if ([message isAttentionMessage])
+	{
+        [multicastDelegate xmppAttention:self didReceiveAttentionHeadlineMessage:message];
+    }
+}
+
+
+#ifdef _XMPP_CAPABILITIES_H
+/**
+ * If an XMPPCapabilites instance is used we want to advertise our support for attention requests.
+ **/
+- (void)xmppCapabilities:(XMPPCapabilities *)sender collectingMyCapabilities:(NSXMLElement *)query
+{
+	// This method is invoked on the moduleQueue.
+	
+	if (respondsToQueries)
+	{
+		// <query xmlns="http://jabber.org/protocol/disco#info">
+		//   ...
+		//   <feature var="urn:xmpp:attention:0"/>
+		//   ...
+		// </query>
+		
+		NSXMLElement *feature = [NSXMLElement elementWithName:@"feature"];
+		[feature addAttributeWithName:@"var" stringValue:XMLNS_ATTENTION];
+		
+		[query addChild:feature];
+	}
+}
+#endif
+
+@end

Extensions/XEP-0224/XMPPMessage+XEP_0224.h

@@ -0,0 +1,8 @@
+#import "XMPPMessage.h"
+#define XMLNS_ATTENTION  @"urn:xmpp:attention:0"
+
+@interface XMPPMessage (XEP_0224) 
+- (BOOL)isHeadLineMessage;
+- (BOOL)isAttentionMessage;
+- (BOOL)isAttentionMessageWithBody;
+@end

Extensions/XEP-0224/XMPPMessage+XEP_0224.m

@@ -0,0 +1,24 @@
+#import "XMPPMessage+XEP_0224.h"
+#import "NSXMLElement+XMPP.h"
+
+@implementation XMPPMessage (XEP_0224)
+
+- (BOOL)isHeadLineMessage {
+    return [[[self attributeForName:@"type"] stringValue] isEqualToString:@"headline"];
+}
+
+- (BOOL)isAttentionMessage
+{
+	return  [self isHeadLineMessage] && [self elementForName:@"attention" xmlns:XMLNS_ATTENTION];
+}
+
+- (BOOL)isAttentionMessageWithBody
+{
+	if([self isAttentionMessage])
+	{
+		return [self isMessageWithBody];
+	}
+	return NO;
+}
+
+@end