com.xinlei.core.app.cas.web.ProxyTicketSampleServlet.java Source code

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Here is the source code for com.xinlei.core.app.cas.web.ProxyTicketSampleServlet.java

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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 com.xinlei.core.app.cas.web;

import org.jasig.cas.client.ssl.HttpsURLConnectionFactory;
import org.jasig.cas.client.util.CommonUtils;
import org.springframework.security.cas.authentication.CasAuthenticationToken;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLEncoder;

/**
 * Created by xzhou on 8/24/2015.
 */
public final class ProxyTicketSampleServlet extends HttpServlet {
    /**
     * This is the URL that will be called and authenticate a proxy ticket.
     */
    private String targetUrl;

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // NOTE: The CasAuthenticationToken can also be obtained using
        // SecurityContextHolder.getContext().getAuthentication()
        final CasAuthenticationToken token = (CasAuthenticationToken) request.getUserPrincipal();
        // proxyTicket could be reused to make calls to to the CAS service even if the
        // target url differs
        final String proxyTicket = token.getAssertion().getPrincipal().getProxyTicketFor(targetUrl);

        // Make a remote call to ourselves. This is a bit silly, but it works well to
        // demonstrate how to use proxy tickets.
        final String serviceUrl = targetUrl + "?ticket=" + URLEncoder.encode(proxyTicket, "UTF-8");
        String proxyResponse = CommonUtils.getResponseFromServer(new URL(serviceUrl),
                new HttpsURLConnectionFactory(), "UTF-8");

        // modify the response and write it out to inform the user that it was obtained
        // using a proxy ticket.
        proxyResponse = proxyResponse.replaceFirst("Secure Page", "Secure Page using a Proxy Ticket");
        proxyResponse = proxyResponse.replaceFirst("<p>",
                "<p>This page is rendered by " + getClass().getSimpleName()
                        + " by making a remote call to the Secure Page using a proxy ticket (" + proxyTicket
                        + ") and inserts this message. ");
        response.setContentType("text/html;charset=UTF-8");
        final PrintWriter writer = response.getWriter();
        writer.write(proxyResponse);
    }

    /**
     * Initialize the target URL. It allows for the host to change based upon the
     * "cas.service.host" system property. If the property is not set, the default is
     * "localhost:8443".
     */
    @Override
    public void init() throws ServletException {
        super.init();
        String casServiceHost = "localhost";
        targetUrl = "https://" + casServiceHost + "/app2/secure/";
    }

    private static final long serialVersionUID = -7720161771819727775L;
}