NSURLRequestFileInfo.h

#import <Foundation/Foundation.h>

@interface NSURLRequestFileInfo : NSObject
@property NSData *data;
@property NSString *name;
@property NSString *key;
+ (NSURLRequestFileInfo *)fileInfoWithData:(NSData *)data key:(NSString *)key andName:(NSString *)name;
@end

@interface NSURLRequest (FileAdditions)

+ (NSMutableURLRequest *)fileUploadRequestWithURL:(NSURL *)url withFiles:(NSArray *)files variables:(NSDictionary *)variables;

@end

NSURLRequestFileInfo.m

#import "NSURLRequest+FileAdditions.h"

@implementation NSURLRequestFileInfo
+ (NSURLRequestFileInfo *)fileInfoWithData:(NSData *)data key:(NSString *)key andName:(NSString *)name{
	NSURLRequestFileInfo *info = [[NSURLRequestFileInfo alloc] init];
	info.data = data;
	info.name = name;
	info.key = key;
	return info;
}
@end

@implementation NSURLRequest (FileAdditions)

+ (NSMutableURLRequest *)fileUploadRequestWithURL:(NSURL *)url withFiles:(NSArray *)files variables:(NSDictionary *)variables{
	NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:url];
	[urlRequest setHTTPMethod:@"POST"];
	
	NSMutableData *postData = [NSMutableData data];
	NSString *myboundary = @"14737809831466499882746641449";
	NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",myboundary];
	[urlRequest addValue:contentType forHTTPHeaderField: @"Content-Type"];
	
	for(NSURLRequestFileInfo *fileInfo in files){
		[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", myboundary] dataUsingEncoding:NSUTF8StringEncoding]];
		[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", fileInfo.key, fileInfo.name] dataUsingEncoding:NSUTF8StringEncoding]];
		[postData appendData:[@"Content-Type: application/octet-stream\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
		[postData appendData:[NSData dataWithData:fileInfo.data]];
	}
	
	if(variables.count > 0){
		for(NSString *key in variables){
			NSString *parameterValue = [variables objectForKey:key];
			[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",myboundary] dataUsingEncoding:NSUTF8StringEncoding]];
			[postData appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n%@",key,parameterValue] dataUsingEncoding:NSUTF8StringEncoding]];
		}
	}else{
		[postData appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",myboundary] dataUsingEncoding:NSUTF8StringEncoding]];
	}
	
	NSString *postLength = [NSString stringWithFormat:@"%lu",(unsigned long)postData.length];
	[urlRequest setValue:postLength forHTTPHeaderField:@"Content-Length"];
	[urlRequest setHTTPBody:postData];
	
	return urlRequest;
}

@end