Merge pull request robbiehanson#583 from ChatSecure/XEP0352

Added Creation of elements for XEP-0352.

Author: ObjColumnist

Extensions/XEP-0352/NSXMLElement+XEP_0352.h

@@ -0,0 +1,9 @@
+
+#import "NSXMLElement+XMPP.h"
+
+@interface NSXMLElement (XEP0352)
+
++ (instancetype)indicateInactiveElement;
++ (instancetype)indicateActiveElement;
+
+@end

Extensions/XEP-0352/NSXMLElement+XEP_0352.m

@@ -0,0 +1,18 @@
+
+#import "NSXMLElement+XEP_0352.h"
+
+#define XMLNS_XMPP_CLIENT_STATE_INDICATION @"urn:xmpp:csi:0"
+
+@implementation NSXMLElement (XEP0352)
+
++ (instancetype)indicateActiveElement
+{
+    return [NSXMLElement elementWithName:@"active" xmlns:XMLNS_XMPP_CLIENT_STATE_INDICATION];
+}
+
++ (instancetype)indicateInactiveElement
+{
+    return [NSXMLElement elementWithName:@"inactive" xmlns:XMLNS_XMPP_CLIENT_STATE_INDICATION];
+}
+
+@end