Multipart-form PUT request for image upload. NSURLSession, iOS 7

gistfile1.m

+(void)uploadUserPhoto:(UIImage *)image
               success:(void (^)(void))success
               failure:(FailureBlock)failure
{
    GTSessionManager * manager = [GTSessionManager manager];

    NSString* tmpFilename = [NSString stringWithFormat:@"%f", [NSDate timeIntervalSinceReferenceDate]];
    NSURL* tmpFileUrl = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:tmpFilename]];
    
    NSString * query = [NSString stringWithFormat:@"%@user?auth_token=%@",[manager.baseURL absoluteString],[[UserManager shared] authToken]];
    
    // Create a multipart form request.
    NSMutableURLRequest *multipartRequest = [[manager requestSerializer] multipartFormRequestWithMethod:@"PUT"
                                                                                              URLString:query
                                                                                             parameters:nil
                                                                              constructingBodyWithBlock:^(id<AFMultipartFormData> formData)
                                             {
                                                 [formData appendPartWithFileData:UIImagePNGRepresentation(image)
                                                                             name:@"photo"
                                                                         fileName:@"photo.png"
                                                                         mimeType:@"image/png"];
                                             } error:nil];
    
    [[manager requestSerializer] requestWithMultipartFormRequest:multipartRequest
                                    writingStreamContentsToFile:tmpFileUrl
                                               completionHandler:^(NSError *error) {
                    NSURLSessionUploadTask * task = [manager uploadTaskWithRequest:multipartRequest
                                              fromFile:tmpFileUrl
                                              progress:nil
                                     completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) {
                                         
                                         [[NSFileManager defaultManager] removeItemAtURL:tmpFileUrl error:nil];
                                         
                                         if (error) {
                                             if (failure)
                                             {
                                                 failure(error);
                                             }
                                         } else {
                                             if (success)
                                             {
                                                success();
                                             }
                                         }
                                     }];
                    
                    [task resume];
                }];
}