Snippet of Network wrapper service using Alamofire upload (Swift 3)

network-upload-snnipet.swift

//Methods to be inside the network wrapper service
private class func _prepareRequest (_ strUrl: String, params: JSON?, method: String = Methods.GET) -> URLRequest {
	var signature = ""
	let url = URL(string: Config.API_URL + strUrl)!
	var urlRequest = URLRequest(url: url)

	urlRequest.httpMethod = method
	urlRequest.setValue("application/json", forHTTPHeaderField: "Content-Type")
	urlRequest.setValue(Config.APPID, forHTTPHeaderField: CustomHeaders.APP_ID)

	if SessionService.isLogged() {
		urlRequest.setValue(SessionService.getToken(), forHTTPHeaderField: CustomHeaders.USERTOKEN)
	}
	return urlRequest
}

class func UPLOAD(_ strURL: String, data:Data, success:@escaping (JSON) -> Void, failure:@escaping (NSError) -> Void) {
	let urlRequest = _prepareRequest(strURL, params: nil, method: Methods.POST)

	Alamofire.upload(multipartFormData: { 
		formData in
			formData.append(data, withName: "upload", fileName: "newTempPhoto.jpg", mimeType: "image/jpeg")
		},
		with: urlRequest,
		encodingCompletion: { encodingResult in
			switch encodingResult {
			  case .success(let upload, _, _):
				upload.responseJSON { responseObject in
				   let resJson = JSON(responseObject.result.value!)
				   if resJson["status"].bool != nil && resJson["status"].bool! {
					   success(resJson)
				   } else {
					   let errorCode = (resJson["token"]["CODE"].number != nil) ? resJson["token"]["CODE"].number as! Int : 999
					   failure(NSError(domain:Bundle.main.bundleIdentifier!, code:errorCode, userInfo:resJson.dictionaryObject))
				   }
				}
				break
			  case .failure(let error as NSError):
				failure(error)
				break
			  default:
				failure(NSError(domain:Bundle.main.bundleIdentifier!, code:999, userInfo:["error": "Unknown error"]))
			}
		}
	)
}


//method to be called from Viewcontroller
func uploadPhoto (_ image:UIImage) {
    if let data = UIImageJPEGRepresentation(image, 80) {

        NetworkService.UPLOAD("/v1/upload",
	      data: data,
	      success: { (JSONResponse) -> Void in
		  //success code  
		},
		failure: { (error) -> Void in
		    SwAlert.showAlert(
			NSLocalizedString("alert.error", comment: ""),
			message: NSLocalizedString("alert.generic_description", comment: ""),
			buttonTitle: NSLocalizedString("alert.button.ok", comment: "")
		    )
		})

    }
}