de.kaffeeshare.server.NamespaceCheck.java Source code

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Here is the source code for de.kaffeeshare.server.NamespaceCheck.java

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/*******************************************************************************
 * Copyright 2013 Jens Breitbart, Daniel Klemm, Dennis Obermann
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package de.kaffeeshare.server;

import java.io.IOException;
import java.util.logging.Logger;

import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.labs.repackaged.org.json.JSONException;
import com.google.appengine.labs.repackaged.org.json.JSONObject;

import de.kaffeeshare.server.datastore.DatastoreManager;

/**
 * Namespace check service.
 */
public class NamespaceCheck extends HttpServlet {

    private static final long serialVersionUID = -4417846428551748172L;
    private static final String PARAM_NAMESPACE = "ns";

    private static final Logger log = Logger.getLogger(NamespaceCheck.class.getName());

    /**
     * Handle a post request.
     * @param req Request
     * @param resp Response
     * @throws ServletException, IOException
     */
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String namespace = req.getParameter(PARAM_NAMESPACE);
        resp.setContentType("text; charset=UTF-8");

        if (namespace != null) {
            JSONObject json = checkNamespace(namespace);
            if (json == null)
                return;
            resp.getWriter().append(json.toString());
        } else {
            log.warning("no namespace provided!");
            return;
        }
    }

    /**
     * Handle a get request.
     * @param req Request
     * @param resp Response
     * @throws ServletException, IOException
     */
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    private JSONObject checkNamespace(String namespace) {
        JSONObject json = new JSONObject();
        try {

            // By convention, all namespaces starting with "_" (underscore) are reserved for system use.
            if (namespace.charAt(0) == '_') {
                json.put("status", "error");
                return json;
            }

            // check if namespace is valid 
            try {
                DatastoreManager.setNamespace(namespace);
            } catch (Exception e) {
                json.put("status", "error");
                return json;
            }

            // check if email and jabber address are valid!
            // I believe a valid email address also a valid jabber address
            // so I only check for valid email address
            try {
                InternetAddress emailAddr = new InternetAddress(namespace + "@abc.com");
                emailAddr.validate();
            } catch (AddressException ex) {
                json.put("status", "error");
                return json;
            }

            // check if namespace is empty
            if (!DatastoreManager.getDatastore().isEmpty()) {
                json.put("status", "use");
                return json;
            }

            json.put("status", "success");
            return json;
        } catch (JSONException e) {
            log.warning("JSON exception @ namespace check");
            e.printStackTrace();
            return null;
        }
    }

}