NSUSL+bitly for easy synchronous url shortening (bit.ly SSL-API v3)

NSURL+Bitly.h

// Requires SBJSON, Uses my own percent escapeing, But cocoas will do for this task.
// All methods return nil on errors. 
@interface NSURL (Bitly)
  // Easy NSURL
  + (NSURL *) shortUrlWithString:(NSString *)string;

  // Easy URL String
  + (NSString *)shortAbsoluteURLStringWithString:(NSString *)string;

  // Returns full bitly response
  + (NSDictionary *)requestShortURLWithString:(NSString *)string
@end

NSURL+Bitly.m

#import "NSURL+Bitly.h"
#define kBitlyAccessToken @"ACCESS_TOKEN"
#define kBitlyFormat @"https://api-ssl.bitly.com/v3/shorten/?access_token=%@&longUrl=%@&format=json"

@implementation NSURL (Bitly)
+ (NSURL *)shortURLWithString:(NSString *)string
{
    NSString *urlString = [NSURL shortAbsoluteURLStringWithString:string];
    if (urlString) {
        return nil;
    }
    
    return [NSURL URLWithString:urlString];
}


+ (NSString *)shortAbsoluteURLStringWithString:(NSString *)string
{
    NSDictionary *info = [NSURL requestShortURLWithString:string];
    if ([[info objectForKey:@"status_code"] integerValue] != 200) {
        NSLog(@"Could not shorten url: %@", info);
        return nil;
    }
    
    NSString *urlString = [[info objectForKey:@"data"] objectForKey:@"url"];
    if (![urlString length]) {
        NSLog(@"Could not shorten url: No url found");
        return nil;
    }
    
    return urlString;
}


+ (NSDictionary *)requestShortURLWithString:(NSString *)string
{
    NSString *versionCheckURL = [NSString stringWithFormat:kBitlyFormat, kBitlyAccessToken, [string percentEscapeString]];
    NSURL *url = [NSURL URLWithString:versionCheckURL];
    NSError *loadError = nil;
    NSString *htmlData = [NSString stringWithContentsOfURL:url encoding:NSASCIIStringEncoding error:&loadError];
    if (!htmlData) {
        return nil;
    }
    SBJsonParser *parser = [[SBJsonParser alloc] init];
    NSDictionary *bitlyInfo = [parser objectWithString:htmlData error:nil];
    [parser release];
    
    return bitlyInfo;
}
@end