private Dictionary <string, string> ConvertJsonRequestToDictionary(HttpListenerRequest request)
{
string json;
Dictionary <string, string> clientRequest;
// try to retrieve JSON object from body of the request
// if error occurs return null
try
{
// access body (POST) of the message using stream
using (Stream body = request.InputStream)
{
using (StreamReader reader = new StreamReader(body, request.ContentEncoding))
{
json = reader.ReadToEnd();
clientRequest = JsonConvert.DeserializeObject <Dictionary <string, string> >(json);
Console.WriteLine("Json successfully loaded from body");
return(clientRequest);
}
}
}
catch
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Mobile,
"HttpServer",
"ConvertJsonRequestToDictionary",
"Error - Converting POST to json object, check json is correctly formated.",
"");
ApplicationErrorLog.logError(error);
return(null);
}
}
public Boolean SaveImageAsFile()
{
Byte[] imagebytes = null;
try
{
imagebytes = Convert.FromBase64String(ImageURI);
}
catch
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Server,
"Image",
"SaveImageAsFile",
"Failed Coverting image uri to bytes",
ImageName + " - URI failed to convert to bytes");
ApplicationErrorLog.logError(error);
return(false);
}
// if bytes is not null then try and write the image file
if (imagebytes != null)
{
string imageFullSavePath = DEFAULT_PATH + KioskNetworkID + BLUETOOTH_FOLDER + ImageName;
try
{
// write file to share folder using kiosk ID
using (var img = new FileStream(imageFullSavePath, FileMode.Create))
{
img.Write(imagebytes, 0, imagebytes.Length);
img.Flush(); // clear write buffer so it does not effect next file creation
return(true);
}
}
catch
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Server,
"Image",
"SaveImageAsFile",
"Failed writing image file",
"Failed writing image file to path: " + imageFullSavePath);
return(false);
}
}
else
{
return(false);
}
}
// processes the clients request
private void ProccessRequest(IAsyncResult result)
{
Dictionary <string, string> clientRequest;
List <string> responseData = new List <string>();
HttpListenerContext context;
HttpListener httpListener = (HttpListener)result.AsyncState;
context = httpListener.EndGetContext(result);
// convert body request (JSON object) to dictionary
clientRequest = ConvertJsonRequestToDictionary(context.Request);
// if client request is not null, continue to process the request
if (clientRequest != null)
{
string actionKeyValue;
// try and get value from action key and check action required
if (clientRequest.TryGetValue(ACTION_KEY, out actionKeyValue))
{
if (actionKeyValue == ACTION_REQUESTING_KIOSKS)
{
ProccessAvailableKiosksRequest(context.Response);
}
else if (actionKeyValue == ACTION_SENDING_IMAGE)
{
// proccess image request type and send response
ProcessImageUploadRequest(clientRequest, context.Response);
}
else if (actionKeyValue == ACTION_REQUEST_FOUND_SERVER)
{
SendResponse(context.Response, true, RequestType.FoundServer, null);
}
else
{
SendResponse(context.Response, true, RequestType.FoundServer, null);
}
}
// if no action key provided by mobile app log error
else
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Mobile,
"HttpServer",
"DetermainRequestAction",
"No action Key in json",
"Client failed to provided 'action' key");
ApplicationErrorLog.logError(error);
// send response - invaild request
// send response error
responseData.Add(ERROR_ACTION_KEY);
SendResponse(context.Response, false, RequestType.ImageUpload, responseData);
}
}
else
{
Console.WriteLine();
}
}
private void ProcessImageUploadRequest(Dictionary <string, string> clientRequest, HttpListenerResponse responseObj)
{
string imageUriKeyValue;
string kioskKeyValue;
string imageFilenameKeyValue;
Boolean imageUriFound = false;
Boolean imageNameFound = false;
Boolean kioskNumberFound = false;
Boolean imageCreated;
List <string> responseData = new List <string>();
// check request has image uri
if (clientRequest.TryGetValue(IMAGE_URI_KEY, out imageUriKeyValue))
{
imageUriFound = true;
}
else
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Mobile,
"HttpServer",
"DetermainRequestAction",
"No '" + IMAGE_URI_KEY + "' key in json",
"Client failed to provid '" + IMAGE_URI_KEY + "' key");
ApplicationErrorLog.logError(error);
// add error to response data
responseData.Add(ERROR_IMAGE_URI);
}
// check request has kiosk number key
if (clientRequest.TryGetValue(KIOSK_KEY, out kioskKeyValue))
{
kioskNumberFound = true;
}
else
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Mobile,
"HttpServer",
"DetermainRequestAction",
"No '" + KIOSK_KEY + "' key in json",
"Client failed to provid '" + KIOSK_KEY + "' key");
ApplicationErrorLog.logError(error);
// add error to response data
responseData.Add(ERROR_KIOSK_NUMBER);
}
// check request has image name
if (clientRequest.TryGetValue(IMAGE_NAME_KEY, out imageFilenameKeyValue))
{
imageNameFound = true;
}
else
{
ApplicationError error = new ApplicationError(
ErrorLocationEnum.Mobile,
"HttpServer",
"DetermainRequestAction",
"No '" + IMAGE_NAME_KEY + "' key in json",
"Client failed to provid '" + IMAGE_NAME_KEY + "' key");
ApplicationErrorLog.logError(error);
// add error to response data
responseData.Add(ERROR_NO_IMAGE_KEY);
}
// create image file if all keys where found - create image
if ((imageUriFound == true) && (kioskNumberFound == true) && (imageNameFound == true))
{
Image img = new Image(imageUriKeyValue, imageFilenameKeyValue, kioskKeyValue);
imageCreated = img.SaveImageAsFile();
// put failed image filename into firt index of the data array
responseData.Add(imageFilenameKeyValue);
if (imageCreated == false)
{
// send response to the client with fail to create image
SendResponse(responseObj, false, RequestType.ImageUpload, responseData);
}
// if created succcesfully, send success response
else
{
// send response to the client with success response
SendResponse(responseObj, true, RequestType.ImageUpload, responseData);
}
}
// if an error occurred on any required keys - send error message/s back to client
else
{
SendResponse(responseObj, false, RequestType.ImageUpload, responseData);
}
}