org.codehaus.groovy.grails.plugins.springsecurity.RedirectUtils.java Source code

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Here is the source code for org.codehaus.groovy.grails.plugins.springsecurity.RedirectUtils.java

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/* Copyright 2006-2009 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 org.codehaus.groovy.grails.plugins.springsecurity;

import java.io.IOException;

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

import org.springframework.security.util.PortResolver;
import org.springframework.security.util.PortResolverImpl;

/**
 * Fixes <a href='http://jira.codehaus.org/browse/GRAILSPLUGINS-273'>this redirect bug</a>.
 * @author Tsuyoshi Yamamoto
 */
public final class RedirectUtils {

    private static final PortResolver RESOLVER = new PortResolverImpl();

    private RedirectUtils() {
        // static only
    }

    /**
     * Send a redirect.
     * @param request  the request
     * @param response  the response
     * @param url the target url to redirect to
     * @throws IOException  if there's a problem
     */
    public static void sendRedirect(final HttpServletRequest request, final HttpServletResponse response,
            final String url) throws IOException {

        String redirect = buildRedirectUrl(request, response, url);
        response.sendRedirect(response.encodeRedirectURL(redirect));
    }

    /**
     * Build a redirect url.
     * @param request  the request
     * @param response  the response
     * @param url the target url to redirect to
     * @return  the url
     */
    public static String buildRedirectUrl(final HttpServletRequest request, final HttpServletResponse response,
            final String url) {

        if (!url.startsWith("http://") && !url.startsWith("https://")) {
            String scheme = request.getScheme();
            int serverPort = RESOLVER.getServerPort(request);
            boolean inHttp = "http".equalsIgnoreCase(scheme);
            boolean inHttps = "https".equalsIgnoreCase(scheme);
            boolean includePort = !((inHttp && serverPort == 80) || (inHttps && serverPort == 443));
            String port = includePort ? ":" + serverPort : "";
            return scheme + "://" + request.getServerName() + port + request.getContextPath() + url;
        }

        return url;
    }
}