org.mocksy.rules.http.HttpProxyRule.java Source code

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Here is the source code for org.mocksy.rules.http.HttpProxyRule.java

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package org.mocksy.rules.http;

/*
 * Copyright 2009, PayPal
 *
 *  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.
 */

import java.io.UnsupportedEncodingException;
import java.net.ConnectException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.http.Header;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.mocksy.Request;
import org.mocksy.Response;
import org.mocksy.rules.Matcher;
import org.mocksy.rules.Rule;
import org.mocksy.server.http.HttpRequest;
import org.mocksy.server.http.HttpResponse;

public class HttpProxyRule implements Rule {
    private Collection<Matcher> matchers = new ArrayList<Matcher>();
    private String proxyUrl;

    public HttpProxyRule(String proxyUrl) {
        this.proxyUrl = proxyUrl;
        this.clear();
    }

    public void addMatcher(Matcher matcher) {
        this.matchers.add(matcher);
    }

    public boolean matches(Request request) {
        if (this.matchers.isEmpty())
            return false;
        for (Matcher matcher : this.matchers) {
            if (!matcher.matches(request))
                return false;
        }
        return true;
    }

    public void clear() {
        this.matchers.clear();
    }

    public String getProxyUrl() {
        return this.proxyUrl;
    }

    public Response process(Request request) throws Exception {
        if (!(request instanceof HttpRequest)) {
            throw new IllegalArgumentException("ProxyRule only works for HttpRequests");
        }
        HttpRequest httpRequest = (HttpRequest) request;
        HttpClient httpClient = new DefaultHttpClient();
        HttpRequestBase method = this.getProxyMethod(httpRequest.getServletRequest());
        // httpRequest.getServletRequest();
        HttpResponse response = null;
        try {
            org.apache.http.HttpResponse httpResp = httpClient.execute(method);

            response = new HttpResponse("proxied response", httpResp.getEntity().getContent());
            response.setStatusCode(httpResp.getStatusLine().getStatusCode());

            // Pass response headers back to the client
            Header[] headerArrayResponse = httpResp.getAllHeaders();
            for (Header header : headerArrayResponse) {
                response.setHeader(header.getName(), header.getValue());
            }
        } catch (ConnectException e) {
            response = new HttpResponse("connection failed",
                    "Proxied server at " + method.getURI() + " is unavailable.");
            response.setStatusCode(503);
        }

        return response;
    }

    public Collection<Matcher> getMatchers() {
        return this.matchers;
    }

    protected HttpRequestBase getProxyMethod(HttpServletRequest request) {
        String proxyUrl = this.proxyUrl;
        proxyUrl += request.getPathInfo();
        if (request.getQueryString() != null) {
            proxyUrl += "?" + request.getQueryString();
        }
        HttpRequestBase method = null;
        if ("GET".equals(request.getMethod())) {
            method = new HttpGet(proxyUrl);
            method.addHeader("Cache-Control", "no-cache");
            method.addHeader("Pragma", "no-cache");
        } else if ("POST".equals(request.getMethod())) {
            method = new HttpPost(proxyUrl);

            Map<String, String[]> paramMap = request.getParameterMap();
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            for (String paramName : paramMap.keySet()) {
                String[] values = paramMap.get(paramName);
                for (String value : values) {
                    NameValuePair param = new BasicNameValuePair(paramName, value);
                    params.add(param);
                }
            }

            try {
                ((HttpPost) method).setEntity(new UrlEncodedFormEntity(params));
            } catch (UnsupportedEncodingException e) {
                // don't worry, this won't happen
            }
        }

        Enumeration headers = request.getHeaderNames();
        while (headers.hasMoreElements()) {
            String header = (String) headers.nextElement();
            if ("If-Modified-Since".equals(header) || "Content-Length".equals(header)
                    || "Transfer-Encoding".equals(header))
                continue;
            Enumeration values = request.getHeaders(header);
            while (values.hasMoreElements()) {
                String value = (String) values.nextElement();
                method.addHeader(header, value);
            }
        }

        return method;
    }
}