Reverse OAuth for Twitter API via Parse.com

PFTwitterUtils+NativeTwitter.m

+ (void)twitterReverseAuthResponseReceived:(NSData *)responseData
{
    if (responseData) {
        NSString *responseStr = [[NSString alloc]
                                 initWithData:responseData
                                 encoding:NSUTF8StringEncoding];
        
        NSArray *parts = [responseStr componentsSeparatedByString:@"&"];
        
        if (parts.count == 4) {
            NSString *oauthToken        = [[parts objectAtIndex:0] stringByReplacingOccurrencesOfString:@"oauth_token=" withString:@""];
            NSString *oauthTokenSecret  = [[parts objectAtIndex:1] stringByReplacingOccurrencesOfString:@"oauth_token_secret=" withString:@""];
            NSString *userId            = [[parts objectAtIndex:2] stringByReplacingOccurrencesOfString:@"user_id=" withString:@""];
            NSString *screenName        = [[parts objectAtIndex:3] stringByReplacingOccurrencesOfString:@"screen_name=" withString:@""];
            NSLog(@"userId: %@", userId);
            NSLog(@"oauthToken: %@", oauthToken);
            NSLog(@"oauthTokenSecret: %@", oauthTokenSecret);
            NSLog(@"screenName: %@", screenName);
            [PFTwitterUtils logInWithTwitterId:userId
                                    screenName:screenName
                                     authToken:oauthToken
                               authTokenSecret:oauthTokenSecret
                                         block:^(PFUser *user, NSError *error) {
                                             if (!error) {
                                                 if (_nativeLogInSuccessBlock) {
                                                     dispatch_async(dispatch_get_main_queue(), ^{
                                                         _nativeLogInSuccessBlock(user, userId, error);
                                                     });
                                                 }
                                             }
                                             else {
                                                 [PFTwitterUtils twitterErrorOccurred:TwitterLogInErrorAuthenticationError];
                                             }
                                         }];
        }
        else {
            [PFTwitterUtils twitterErrorOccurred:TwitterLogInErrorAuthenticationError];
        }
    }
}