org.ktunaxa.referral.server.mvc.ProxyController.java Source code

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Here is the source code for org.ktunaxa.referral.server.mvc.ProxyController.java

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/*
 * Ktunaxa Referral Management System.
 *
 * Copyright (C) see version control system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.ktunaxa.referral.server.mvc;

import java.io.IOException;
import java.net.URLDecoder;
import java.util.Enumeration;

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

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.lang.NotImplementedException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @author Jan De Moerloose
 */
@Controller("/proxy/**")
public class ProxyController {

    @SuppressWarnings("unchecked")
    @RequestMapping(value = "/proxy")
    public final void proxyAjaxCall(@RequestParam(required = true, value = "url") String url,
            HttpServletRequest request, HttpServletResponse response) throws IOException {

        // URL needs to be url decoded
        url = URLDecoder.decode(url, "utf-8");

        HttpClient client = new HttpClient();
        try {

            HttpMethod method = null;

            // Split this according to the type of request
            if ("GET".equals(request.getMethod())) {

                method = new GetMethod(url);
                NameValuePair[] pairs = new NameValuePair[request.getParameterMap().size()];
                int i = 0;
                for (Object name : request.getParameterMap().keySet()) {
                    pairs[i++] = new NameValuePair((String) name, request.getParameter((String) name));
                }
                method.setQueryString(pairs);

            } else if ("POST".equals(request.getMethod())) {

                method = new PostMethod(url);

                // Set any eventual parameters that came with our original
                // request (POST params, for instance)
                Enumeration paramNames = request.getParameterNames();
                while (paramNames.hasMoreElements()) {

                    String paramName = (String) paramNames.nextElement();
                    ((PostMethod) method).setParameter(paramName, request.getParameter(paramName));
                }

            } else {

                throw new NotImplementedException("This proxy only supports GET and POST methods.");
            }

            // Execute the method
            client.executeMethod(method);

            // Set the content type, as it comes from the server
            Header[] headers = method.getResponseHeaders();
            for (Header header : headers) {

                if (header.getName().equalsIgnoreCase("Content-Type")) {

                    response.setContentType(header.getValue());
                }
            }

            // Write the body, flush and close
            response.getOutputStream().write(method.getResponseBody());

        } catch (HttpException e) {

            // log.error("Oops, something went wrong in the HTTP proxy", null, e);
            response.getOutputStream().write(e.toString().getBytes("UTF-8"));
            throw e;

        } catch (IOException e) {

            e.printStackTrace();
            response.getOutputStream().write(e.toString().getBytes("UTF-8"));
            throw e;
        }
    }
}