net.anotheria.anosite.photoserver.presentation.upload.UploadServlet Maven / Gradle / Ivy

Go to download

package net.anotheria.anosite.photoserver.presentation.upload;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.anotheria.anoplass.api.APIException;
import net.anotheria.anoplass.api.APIFinder;
import net.anotheria.anosite.photoserver.api.upload.PhotoUploadAPI;
import net.anotheria.anosite.photoserver.api.upload.PhotoUploader;
import net.anotheria.anosite.photoserver.presentation.shared.BaseServlet;
import net.anotheria.util.StringUtils;

import org.json.simple.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This is a generic fileupload servlet. You need to extend it and implement the getFileReceiver-Method in order to do whatever is neccessary with the uploaded
 * file data.
 * 
 * On a GET request without parameters the servlet responses with a unique upload-id (json object {id: xxx }) which has to be present on a following POST
 * (multipart/form) request as parameter "id".
 * 
 * On a GET request with parameter "id" present passing a unique upload-id it responses with a json object giving the current status of the upload:
 * 
 * Example: {"progress":0..100%,"status":0,"data":null,"filename":"102702439_55cec15215.jpg","size":"54 kB"}
 * 
 * Description:
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * Attribute Description
progress How many percent of the file is uploaded 0..100%
status status of the fileupload:
 * 
 * 2: upload has not started yes
 * 1: upload in progress
 * 0: upload finished
 * -1: filesize to large error
 * -2: some undefined technical problems (e.g. status 500)
 * 
-3: file was rejected by FileReceiver (reason may be in attribute 'data')
 * 
-4: uploadId is invalid (maybe timeout?)
 * 
 * 
data filereceiver may pass data to client using this attribute. e.g. url of img-src or error-text
filename filename of the uploaded file, only present if status=0
size human readable size of file, only present if status=0
 * 
 * @author otoense
 * 
 */
public class UploadServlet extends BaseServlet {

	private static final long serialVersionUID = 1L;

	private static final Logger LOG = LoggerFactory.getLogger(UploadServlet.class);

	private static final PhotoUploadAPI photoUploadAPI = APIFinder.findAPI(PhotoUploadAPI.class);

	public static final String PARAM_UPLOADID = "id";

	/**
	 * {@link HttpServletRequest} parameter: photo
	 */
	public static final String PARAM_UPLOAD_USER_ID = "userId";

	@SuppressWarnings("unchecked")
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String uploadId = request.getParameter(PARAM_UPLOADID);
		String userId = request.getParameter(PARAM_UPLOAD_USER_ID);

		if (StringUtils.isEmpty(uploadId)) {
			PhotoUploader uploader;
			try {
				uploader = photoUploadAPI.createPhotoUploader(userId);
			} catch (APIException e) {
				LOG.warn("Can't create PhotoUploader", e);
				return;
			}
			JSONObject json = new JSONObject();
			json.put("id", uploader.getId());
			writeResponse(response, json.toJSONString());
			return;
		}

		PhotoUploader uploader = photoUploadAPI.getMyPhotoUploader(uploadId);
		writeResponse(response, uploader.getStatus().toJSONString());
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String uploadId = request.getParameter(PARAM_UPLOADID);

		if (uploadId == null || uploadId.length() == 0) {
			throw new ServletException("Invalid uploadId");
		}

		PhotoUploader uploader = photoUploadAPI.getMyPhotoUploader(uploadId);
		uploader.doUpload(request);
	}
}

*	Attribute	Description
progress	How many percent of the file is uploaded 0..100%
status	status of the fileupload: * * 2: upload has not started yes * 1: upload in progress * 0: upload finished * -1: filesize to large error * -2: some undefined technical problems (e.g. status 500) * -3: file was rejected by FileReceiver (reason may be in attribute 'data') * -4: uploadId is invalid (maybe timeout?) * *
data	filereceiver may pass data to client using this attribute. e.g. url of img-src or error-text
filename	filename of the uploaded file, only present if status=0
size	human readable size of file, only present if status=0