Upload an image using Twitter Fabric

upload.m

    [[Twitter sharedInstance] logInWithCompletion:^(TWTRSession *session, NSError *error){
        // Ensure the auth worked
        if (session) {
            NSLog(@"Twitter Session %@ / %@ found", session.authToken, session.authTokenSecret);
        } else {
            NSLog(@"Login error: %@", error);
        }
        
        // Get a random image
        UIImage *corgiImage = [UIImage imageNamed:@"Corgis_Small.jpeg"];
        NSData *corgiData = UIImageJPEGRepresentation(corgiImage, 0.9);
        NSString *corgiString = [corgiData base64EncodedStringWithOptions:0];
        
        NSString *mediaEndpoint = @"https://upload.twitter.com/1.1/media/upload.json";
        
        NSError *requestError;
        TWTRAPIClient *client = [[Twitter sharedInstance] APIClient];
        // Build the POST request with the image data in the body
        NSURLRequest *request = [client URLRequestWithMethod:@"POST" URL:mediaEndpoint parameters:@{@"media":corgiString} error:&requestError];
        if (request) {
            [[[Twitter sharedInstance] APIClient] sendTwitterRequest:request completion:^(NSURLResponse *urlResponse, NSData *data, NSError *connectionError) {
                if (data) {
                     NSError *parsingError;
                     // Grab the JSON response
                     NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&parsingError];
                     if (!responseJSON) {
                         NSLog(@"Parsing error: %@", parsingError);
                     } else {
                         // Valid JSON here
                         NSLog(@"Response: %@", responseJSON);
                     }
                } else {
                    NSLog(@"Connection error: %@", connectionError);
                }
                }];
        } else {
            NSLog(@"Request generation error: %@", requestError);
        }
        
    }];