root / src / gr / ebs / gss / server / TokenRetriever.java @ 1919e87f
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/*
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* Copyright 2008, 2009 Electronic Business Systems Ltd.
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*
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* This file is part of GSS.
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*
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* GSS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GSS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GSS. If not, see <http://www.gnu.org/licenses/>.
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*/
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package gr.ebs.gss.server; |
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import gr.ebs.gss.client.exceptions.ObjectNotFoundException; |
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import gr.ebs.gss.client.exceptions.RpcException; |
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import gr.ebs.gss.server.domain.User; |
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import java.io.IOException; |
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import java.io.PrintWriter; |
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import java.net.URLEncoder; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import org.apache.commons.codec.binary.Base64; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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/**
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* The servlet that handles authentication token retrieval.
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*
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* @author past
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*/
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public class TokenRetriever extends BaseServlet { |
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/**
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* The serial version UID of the class.
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*/
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private static final long serialVersionUID = 1L; |
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/**
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* The request parameter name for the nonce.
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*/
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private static final String NONCE_PARAM = "nonce"; |
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/**
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* The request parameter name for the user.
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*/
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private static final String USER_PARAM = "user"; |
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/**
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* The logger.
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*/
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private static Log logger = LogFactory.getLog(TokenRetriever.class); |
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@Override
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public void service(HttpServletRequest request, HttpServletResponse response) throws IOException { |
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String username = request.getParameter(USER_PARAM);
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String nonceEncoded = request.getParameter(NONCE_PARAM);
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User user = null;
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if (username == null) { |
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String error = "No username supplied"; |
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logger.info(error); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_FORBIDDEN, error); |
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return;
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} |
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if (nonceEncoded == null) { |
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String error = "No nonce supplied"; |
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logger.info(error); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_FORBIDDEN, error); |
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return;
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} |
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nonceEncoded = URLEncoder.encode(nonceEncoded, "US-ASCII"); |
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try {
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user = getService().findUser(username); |
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if (user == null) { |
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String error = "User was not found"; |
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logger.info(error); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_FORBIDDEN, error); |
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return;
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} |
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String nonce = user.getNonce();
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if (nonce == null || !nonce.equals(nonceEncoded)) |
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throw new ObjectNotFoundException("No match found"); |
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} catch (RpcException e) {
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String error = "An error occurred while communicating with the service"; |
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logger.error(error, e); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, error); |
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return;
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} catch (ObjectNotFoundException e) {
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logger.info(e.getMessage()); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_FORBIDDEN, e.getMessage()); |
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return;
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} |
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byte[] token = user.getAuthToken(); |
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if (token == null) { |
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String error = "Authentication token invalid"; |
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logger.error(error); |
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response.setContentType("text/html");
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response.sendError(HttpServletResponse.SC_UNAUTHORIZED, error); |
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return;
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} |
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user.setNonce(null);
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user.setNonceExpiryDate(null);
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String tokenEncoded = new String(Base64.encodeBase64(token), "US-ASCII"); |
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response.setContentType("text/plain");
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PrintWriter out = response.getWriter();
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out.println(tokenEncoded); |
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} |
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} |