multipart POST

gistfile1.m

+ (void)multipartPost:(NSString *)path postParams:(NSDictionary *)postParams success:(void (^)(id object))successHandler
              failure:(void (^)(NSHTTPURLResponse*, NSData*, NSError*))failureHandler NS_AVAILABLE(10_7, 5_0) {
    
    NSString *boundary = @"----------------------------ToOdOiPhOnEaPp";
    
    NSMutableURLRequest *request = [self postRequest:path];
    
    NSString *contentType = $S(@"multipart/form-data, boundary=%@", boundary);
    [request setValue:contentType forHTTPHeaderField:@"Content-type"];
    
    NSMutableData *postBody = [[NSMutableData alloc] init];
    
    for (NSString *key in postParams) {
        
        [postBody appendData:[$S(@"\r\n--%@\r\n", boundary) dataUsingEncoding:NSUTF8StringEncoding]];

        id value = [postParams objectForKey:key];
        
        if ([value isKindOfClass:[NSData class]]) {
            
            [postBody appendData:[$S(@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", key) dataUsingEncoding:NSUTF8StringEncoding]];
            [postBody appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
            [postBody appendData:value];
            
        } else {

            [postBody appendData:[$S(@"--%@\r\n", boundary) dataUsingEncoding:NSUTF8StringEncoding]];
            [postBody appendData:[$S(@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key) dataUsingEncoding:NSUTF8StringEncoding]];
            [postBody appendData:[value dataUsingEncoding:NSUTF8StringEncoding]];

        }
        
    }
    
    [postBody appendData:[$S(@"\r\n--%@--\r\n", boundary) dataUsingEncoding:NSUTF8StringEncoding]];
        
    [request setHTTPBody:postBody];
    
    [self sendAPIRequest:request success:successHandler failure:failureHandler];

}