edu.slu.tpen.servlet.LoginServlet.java Source code

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Here is the source code for edu.slu.tpen.servlet.LoginServlet.java

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/*
 * Copyright 2013-2014 Saint Louis University. Licensed under the
 *   Educational Community 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.osedu.org/licenses/ECL-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 edu.slu.tpen.servlet;

import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import static edu.slu.util.ServletUtils.getBaseContentType;
import static edu.slu.util.ServletUtils.reportInternalError;
import user.User;

/**
 * Servlet to log into and log out of T-PEN.
 *
 * @author tarkvara
 */
public class LoginServlet extends HttpServlet {

    /**
     * Handles the HTTP <code>POST</code> method by logging in using the given credentials.  Credentials
     * should be specified as a JSON object in the request body.  There is also a deprecated way of passing
     * the credentials as query parameters.
     *
     * @param req servlet request
     * @param resp servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        try {
            String mail = null, password = null;
            if (req.getContentLength() > 0) {
                String contentType = getBaseContentType(req);
                if (contentType.equals("application/json")) {
                    ObjectMapper mapper = new ObjectMapper();
                    Map<String, String> creds = mapper.readValue(req.getInputStream(),
                            new TypeReference<Map<String, String>>() {
                            });
                    mail = creds.get("mail");
                    password = creds.get("password");
                }
            } else {
                // Deprecated approach where user-name and password are passed on the query string.
                mail = req.getParameter("uname");
                password = req.getParameter("password");
            }
            if (mail != null && password != null) {
                User u = new User(mail, password);
                if (u.getUID() > 0) {
                    HttpSession sess = req.getSession(true);
                    sess.setAttribute("UID", u.getUID());
                } else {
                    resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
                }
            } else if (mail == null && password == null) {
                // Passing null data indicates a logout.
                HttpSession sess = req.getSession(true);
                sess.removeAttribute("UID");
                resp.setStatus(HttpServletResponse.SC_NO_CONTENT);
            } else {
                // Only supplied one of user-id and password.
                resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            }
        } catch (NoSuchAlgorithmException ex) {
            reportInternalError(resp, ex);
        }
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "T-PEN Login Servlet";
    }
}