cn.vlabs.umt.ui.servlet.PublicKeyServlet.java Source code

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Here is the source code for cn.vlabs.umt.ui.servlet.PublicKeyServlet.java

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/*
 * Copyright (c) 2008-2013 Computer Network Information Center (CNIC), Chinese Academy of Sciences.
 *
 * 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 cn.vlabs.umt.ui.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import org.springframework.beans.factory.BeanFactory;

import cn.vlabs.umt.services.site.AppService;
import cn.vlabs.umt.services.site.Application;
import cn.vlabs.umt.ui.Attributes;

public class PublicKeyServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String keyString = request.getParameter("keyid");
        if (keyString == null) {
            wrongParameter(response);
            return;
        }
        try {
            AppService service = (AppService) factory.getBean("ApplicationService");
            int keyid = -1;
            String content;
            if ("umt".equals(keyString)) {
                Application app = service.getApplication("umt");
                keyid = app.getKeyid();
                content = app.getPublicKey();
            } else {
                keyid = Integer.parseInt(keyString);
                content = service.getPublicKey(keyid);
            }
            if (content != null) {
                response.setContentType("text/plain");
                response.setHeader("keyid", Integer.toString(keyid));
                PrintWriter out = response.getWriter();
                out.write(content);
                out.flush();
                out.close();
            } else {
                notFound(response);
            }
        } catch (NumberFormatException e) {
            wrongParameter(response);
            return;
        }
    }

    private void notFound(HttpServletResponse response) throws IOException {
        response.sendError(404);
    }

    private void wrongParameter(HttpServletResponse response) throws IOException {
        response.sendError(500);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

    public void init() throws ServletException {
        factory = (BeanFactory) getServletContext().getAttribute(Attributes.APPLICATION_CONTEXT_KEY);
    }

    private BeanFactory factory;
}