#pragma mark - UIWebViewDelegate

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

    NSLog(@"%@", request);

    if([  [[request URL] description] rangeOfString:@"access_token="].location != NSNotFound){

        AVAccessToken *accsessToken = [[AVAccessToken alloc] init];

        NSString *query = [[request URL] description];

        NSArray *array = [query componentsSeparatedByString:@"#"];

        if([array count] > 1){
            query = [array lastObject];
        }

        NSArray *pairs = [query componentsSeparatedByString:@"&"];

        for(NSString *pair in pairs){

            NSArray *comp = [pair componentsSeparatedByString:@"="];

            if([[comp firstObject] isEqualToString:@"access_token"]){

                accsessToken.token = [comp lastObject];
            }else if([[comp firstObject] isEqualToString:@"user_id"]){

                accsessToken.userID = [comp lastObject];
            }else if([[comp firstObject] isEqualToString:@"expires_in"]){

                NSTimeInterval interval = [[comp lastObject] doubleValue];

                accsessToken.expirationDate = [NSDate dateWithTimeIntervalSinceNow:interval];
            }
        }

        self.webView.delegate = nil;

        if(self.completionBlock){
            self.completionBlock(accsessToken);
        }

        [self dismissViewControllerAnimated:YES completion:nil];

        return NO;
    }

    return YES;
}