Uploading Image to Server

upload.swift

  static func uploadImage(image:UIImage,token:String, imageType:String, callback:((message:String?, error:String?)->Void))->NSURLSessionTask{
        
            var imageData = UIImagePNGRepresentation(image)
           
            var request = NSMutableURLRequest(URL: NSURL(string:APIKeys.url.rawValue)!)
            request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData

            var session = NSURLSession.sharedSession()            
            request.HTTPMethod = "POST"
            
            var boundary = NSString(format: "---------------------------14737809831466499882746641449")
            var contentType = NSString(format: "multipart/form-data; boundary=%@",boundary)
           
            request.addValue(contentType as String, forHTTPHeaderField: "Content-Type")
            
            var body = NSMutableData.alloc()
            
            // Add
            body.appendData(NSString(format: "\r\n--%@\r\n",boundary).dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(NSString(format:"Content-Disposition: form-data; name=\"add\"\r\n\r\n").dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData("Test".dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)

            // Image Internal Type, mime later 
            body.appendData(NSString(format: "\r\n--%@\r\n",boundary).dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(NSString(format:"Content-Disposition: form-data; name=\"content_type\"\r\n\r\n").dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(imageType.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)

            // Token
            body.appendData(NSString(format: "\r\n--%@\r\n",boundary).dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(NSString(format:"Content-Disposition: form-data; name=\"tok\"\r\n\r\n").dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(token.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: true)!)
 
          
            //Other fields
        
          
            body.appendData(NSString(format: "\r\n--%@\r\n", boundary).dataUsingEncoding(NSUTF8StringEncoding)!)


            body.appendData(NSString(format:"Content-Disposition: form-data; name=\"image\"; filename=\"img\(NSDate()).png\"\r\n").dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(NSString(format: "Content-Type: image/png\r\n\r\n").dataUsingEncoding(NSUTF8StringEncoding)!)
            body.appendData(imageData)
           
                
            body.appendData(NSString(format: "\r\n--%@\r\n", boundary).dataUsingEncoding(NSUTF8StringEncoding)!)
            request.HTTPBody = body
        
        
            //  session.uploadTaskWithRequest(request, fromData: body)
           // NSURLSessionUploadTask()
            let task = session.uploadTaskWithRequest(request, fromData: body, completionHandler: { (data, response, error) -> Void in
                  var returnString:String?
                if let data = data, string = NSString(data: data, encoding: NSUTF8StringEncoding) {
                    returnString = string as String
                }
                
                var errorText:String?
                if let error = error{
                    errorText = error.description
                }
                
                callback(message: returnString, error: errorText)
                

                })
            task.resume()
       
        return task
    }