Simple password authentication

gistfile1.m

-(void)checkPassword {
	[[MSAPIController sharedAPIController] authenticateWithPassword:self.passField.text
						 onComplete:^(BOOL success, NSInteger statusCode) {
							 if(success) {
								 [self proceed];
							 } else {
								 [self loginFailed];
							 }
						 }];
}				 
-(void)authenticateWithPassword:(NSString*)password
		onComplete:(void(^)(BOOL success, NSInteger statusCode))onComplete {
	
	// Setup the session
	NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
	sessionConfiguration.HTTPAdditionalHeaders = @{ @"Content-Type"  : @"application/x-www-form-urlencoded; charset=utf-8" };
	
	// Create the session
	NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];
	
	NSURL *url = [NSURL URLWithString:kMSAuthenticationURL];
	NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
	request.HTTPMethod = @"POST";
	request.HTTPBody = [[NSString stringWithFormat:@"pass=%@",password] dataUsingEncoding:NSUTF8StringEncoding];
	
	[[session dataTaskWithRequest:request
				completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
					dispatch_async(dispatch_get_main_queue(), ^{
					
						if([response isKindOfClass:NSHTTPURLResponse.class]) {
							NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse*)response;
							if(urlResponse.statusCode == 200) {
								onComplete(YES, urlResponse.statusCode);
							} else {
								onComplete(NO, urlResponse.statusCode);
							}
							return;
						}
						onComplete(NO, 0);
						
						[session invalidateAndCancel];
					});
				}] resume];
}