iOS Default User Agent

user_agent.m

#pragma mark get user agent

+ (NSString *)defaultUserAgentString
{
	@synchronized (self) {

		if (!defaultUserAgent) {

			NSBundle *bundle = [NSBundle bundleForClass:[self class]];

			// Attempt to find a name for this application
			NSString *appName = [bundle objectForInfoDictionaryKey:@"CFBundleDisplayName"];
			if (!appName) {
				appName = [bundle objectForInfoDictionaryKey:@"CFBundleName"];
			}

			NSData *latin1Data = [appName dataUsingEncoding:NSUTF8StringEncoding];
			appName = [[[NSString alloc] initWithData:latin1Data encoding:NSISOLatin1StringEncoding] autorelease];

			// If we couldn't find one, we'll give up (and ASIHTTPRequest will use the standard CFNetwork user agent)
			if (!appName) {
				return nil;
			}

			NSString *appVersion = nil;
			NSString *marketingVersionNumber = [bundle objectForInfoDictionaryKey:@"CFBundleShortVersionString"];
			NSString *developmentVersionNumber = [bundle objectForInfoDictionaryKey:@"CFBundleVersion"];
			if (marketingVersionNumber && developmentVersionNumber) {
				if ([marketingVersionNumber isEqualToString:developmentVersionNumber]) {
					appVersion = marketingVersionNumber;
				} else {
					appVersion = [NSString stringWithFormat:@"%@ rv:%@",marketingVersionNumber,developmentVersionNumber];
				}
			} else {
				appVersion = (marketingVersionNumber ? marketingVersionNumber : developmentVersionNumber);
			}

			NSString *deviceName;
			NSString *OSName;
			NSString *OSVersion;
			NSString *locale = [[NSLocale currentLocale] localeIdentifier];

			#if TARGET_OS_IPHONE
				UIDevice *device = [UIDevice currentDevice];
				deviceName = [device model];
				OSName = [device systemName];
				OSVersion = [device systemVersion];

			#else
				deviceName = @"Macintosh";
				OSName = @"Mac OS X";

				// From http://www.cocoadev.com/index.pl?DeterminingOSVersion
				// We won't bother to check for systems prior to 10.4, since ASIHTTPRequest only works on 10.5+
				OSErr err;
				SInt32 versionMajor, versionMinor, versionBugFix;
				err = Gestalt(gestaltSystemVersionMajor, &versionMajor);
				if (err != noErr) return nil;
				err = Gestalt(gestaltSystemVersionMinor, &versionMinor);
				if (err != noErr) return nil;
				err = Gestalt(gestaltSystemVersionBugFix, &versionBugFix);
				if (err != noErr) return nil;
				OSVersion = [NSString stringWithFormat:@"%u.%u.%u", versionMajor, versionMinor, versionBugFix];
			#endif

			// Takes the form "My Application 1.0 (Macintosh; Mac OS X 10.5.7; en_GB)"
			[self setDefaultUserAgentString:[NSString stringWithFormat:@"%@ %@ (%@; %@ %@; %@)", appName, appVersion, deviceName, OSName, OSVersion, locale]];	
		}
		return [[defaultUserAgent retain] autorelease];
	}
	return nil;
}