- Update

Extensions/XEP-0106/NSString+XEP_0106.h

@@ -0,0 +1,9 @@
+#import <Foundation/Foundation.h>
+
+@interface NSString (XEP_0106)
+
+- (NSString *)jidEscapedString;
+
+- (NSString *)jidUnescapedString;
+
+@end

Extensions/XEP-0106/NSString+XEP_0106.m

@@ -0,0 +1,57 @@
+#import "NSString+XEP_0106.h"
+
+@implementation NSString (XEP_0106)
+
+- (NSString *)jidEscapedString
+{
+	NSString *jidEscapedString = self;
+	
+	// XEP-0106: The character sequence \20 MUST NOT be the first or last character of an escaped node identifier.
+	jidEscapedString = [jidEscapedString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+	
+	// \ should only be escaped to \5c if it could be misinterpreted as an escape sequence, so we do this first.
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\5c" withString:@"\\5c5c"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\20" withString:@"\\5c\\20"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\40" withString:@"\\5c\\40"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\3e" withString:@"\\5c\\3e"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\3c" withString:@"\\5c\\3c"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\3a" withString:@"\\5c\\3a"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\2f" withString:@"\\5c\\2f"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\27" withString:@"\\5c\\27"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\26" withString:@"\\5c\\26"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\\22" withString:@"\\5c\\22"];
+	
+	// Escape the charachters
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@" " withString:@"\\20"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\"" withString:@"\\22"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"&" withString:@"\\26"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"\'" withString:@"\\27"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"/" withString:@"\\2f"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@":" withString:@"\\3a"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"<" withString:@"\\3c"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@">" withString:@"\\3e"];
+	jidEscapedString = [jidEscapedString stringByReplacingOccurrencesOfString:@"@" withString:@"\\40"];
+
+	return jidEscapedString;
+}
+
+- (NSString *)jidUnescapedString
+{
+	NSString *jidUnescapedString = self;
+	
+	//Unescape the charachters
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\20" withString:@" "];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\40" withString:@"@"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\3e" withString:@">"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\3c" withString:@"<" ];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\3a" withString:@":"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\2f" withString:@"/"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\27" withString:@"\'"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\26" withString:@"&"];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\22" withString:@"\""];
+	jidUnescapedString = [jidUnescapedString stringByReplacingOccurrencesOfString:@"\\5c" withString:@"\\"];
+
+	return jidUnescapedString;
+}
+
+@end