Upload Image in a container - Swift 4

Hi, I’m trying to upload an image to a database stored in a FileMaker Server with Swift, using FileMaker 17 API, but I can’t make it work, while in POSTMAN everything works.

This is the code I implemented:

func insertImage(completion: @escaping (Error?)->()) {

        let image = UIImage(named: "adriana.jpg")

        let data = image?.jpegData(compressionQuality: 1)! as! NSData

        let boundary = generateBoundaryString()

        let fullData = photoDataToFormData(data: data, boundary: boundary, fileName: "adriana.jpg")

        let url = baseURL.appendingPathComponent("/layouts/LayContact/records/12/containers/picture/1")

        print("URL \(url)")

        var request = URLRequest(url: url)

        request.httpMethod = "POST"

        guard let tokenGuard = self.token else { return }

        request.addValue("Bearer \(tokenGuard)", forHTTPHeaderField: "Authorization")

        request.setValue("multipart/form-data; boundary=" + boundary,

                         forHTTPHeaderField: "Content-Type")

        request.setValue(String(fullData.length), forHTTPHeaderField: "Content-Length")

        request.httpBody = fullData as Data

        request.httpShouldHandleCookies = false

        let config = URLSessionConfiguration.default

        let urlSession = URLSession(configuration: config, delegate: self, delegateQueue: nil)

        urlSession.dataTask(with: request) { data, _, error in

            guard   let data  = data, error == nil,

                let json  = try? JSONSerialization.jsonObject(with: data) as! [String: Any],

                let _  = json["response"] as? [String: Any],

                let messages  = json["messages"] as? [[String: Any]],

                let message      = messages[0]["message"] as? String

                else {

                    debugPrint("error!")

                    completion(error)

                    return

            }

            if message == "OK" {

                completion(nil)

            } else {

                completion(error)

                print(message)

            }

            }.resume()

    }

    private func generateBoundaryString() -> String {

        return "Boundary-\(NSUUID().uuidString)"

    }

    func photoDataToFormData(data:NSData,boundary:String,fileName:String) -> NSData {

        var fullData = NSMutableData()

        // 1 - Boundary should start with --

        let lineOne = "--" + boundary + "\r\n"

        fullData.append(lineOne.data(

            using: String.Encoding.utf8,

            allowLossyConversion: false)!)

        // 2

        let lineTwo = "Content-Disposition: form-data; name=\"image\"; filename=\"" + fileName + "\"\r\n"

        NSLog(lineTwo)

        fullData.append(lineTwo.data(

            using: String.Encoding.utf8,

            allowLossyConversion: false)!)

        // 3

        let lineThree = "Content-Type: image/jpg\r\n\r\n"

        fullData.append(lineThree.data(

            using: String.Encoding.utf8,

            allowLossyConversion: false)!)

        // 4

        fullData.append(data as Data)

        // 5

        let lineFive = "\r\n"

        fullData.append(lineFive.data(

            using: String.Encoding.utf8,

            allowLossyConversion: false)!)

        // 6 - The end. Notice -- at the start and at the end

        let lineSix = "--" + boundary + "--\r\n"

        fullData.append(lineSix.data(

            using: String.Encoding.utf8,

            allowLossyConversion: false)!)

        return fullData

    }

And I am getting the error:

Upload payload must contain a part named 'upload'.

Does anyone know how to fix this problem?

Thanks