Image Upload to Rails 5 w/ Swift 3

ImageUploader.swift

//
//  ImageUploader.swift
//
//  Created by Paul McKellar on 10/9/16.
//  Copyright © 2016 Paul McKellar. All rights reserved.
//

import Foundation

class ImageUploader: NSObject {

    init(data: Data) {
        super.init()

        self.startProcess(data)

        return
    }

    func startProcess(_ data: Data) -> Void {

        let manqueue = OperationQueue.main

        let configuration = URLSessionConfiguration.ephemeral
        configuration.urlCache = nil
        configuration.httpCookieAcceptPolicy = .never
        configuration.httpCookieStorage = nil

        let session = URLSession(configuration: configuration, delegate:nil, delegateQueue: manqueue)

        let url = URL(string:"\(ApiRequest.URLBase)/api/v1/assets.json")!

        let request:NSMutableURLRequest = NSMutableURLRequest(url: url, cachePolicy: NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData, timeoutInterval: 15)

        let FORM_BOUNDARY:String = "Boundary-\(NSUUID().uuidString)"
        let multipartBoundary:String = "--\(FORM_BOUNDARY)"
        let endBoundary:String = "\(multipartBoundary)--"

        let body:NSMutableString = NSMutableString()

        body.appendFormat("%@\r\n",multipartBoundary)
        body.appendFormat("Content-Disposition: form-data; name=\"file\"; filename=\"o.png\"\r\n")
        body.appendFormat("Content-Type: image/png\r\n\r\n")
        let end:String = "\r\n\(endBoundary)"

        let requestData:NSMutableData = NSMutableData();
        requestData.append(body.data(using: String.Encoding.utf8.rawValue)!)
        requestData.append(data)
        requestData.append(end.data(using: String.Encoding.utf8)!)

        let content:String = "multipart/form-data; boundary=\(FORM_BOUNDARY)"
        request.setValue(content, forHTTPHeaderField: "Content-Type")
        request.setValue("\(requestData.length)", forHTTPHeaderField: "Content-Length")
        request.httpBody = requestData as Data
        request.httpMethod = "POST"

        let task = session.dataTask(with: request as URLRequest, completionHandler: {
            data, response, error in
            if error != nil {
                print("BLUR!!! \(error)")
            }
            else {
                print("BLUR!!! \(data)")
                print("BLUR!!! \(response)")
            }
        })
        task.resume()
    }

}

Hacked this together in 3 minutes.

This worked at least once, which is more than I can say for everything else on the internet.

Intended to be sparse/helpful. Can change delegate to self and not use closures.