com.github.tomakehurst.wiremock.http.ProxyResponseRenderer.java Source code

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Here is the source code for com.github.tomakehurst.wiremock.http.ProxyResponseRenderer.java

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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.http;

import com.github.tomakehurst.wiremock.common.KeyStoreSettings;
import com.github.tomakehurst.wiremock.common.ProxySettings;
import com.google.common.collect.ImmutableList;
import org.apache.http.*;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.*;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.ByteArrayEntity;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.LinkedList;
import java.util.List;

import static com.github.tomakehurst.wiremock.common.HttpClientUtils.getEntityAsByteArrayAndCloseStream;
import static com.github.tomakehurst.wiremock.common.LocalNotifier.notifier;
import static com.github.tomakehurst.wiremock.http.RequestMethod.DELETE;
import static com.github.tomakehurst.wiremock.http.RequestMethod.GET;
import static com.github.tomakehurst.wiremock.http.RequestMethod.HEAD;
import static com.github.tomakehurst.wiremock.http.RequestMethod.OPTIONS;
import static com.github.tomakehurst.wiremock.http.RequestMethod.POST;
import static com.github.tomakehurst.wiremock.http.RequestMethod.PUT;
import static com.github.tomakehurst.wiremock.http.RequestMethod.PATCH;
import static com.github.tomakehurst.wiremock.http.RequestMethod.TRACE;
import static com.github.tomakehurst.wiremock.http.Response.response;

public class ProxyResponseRenderer implements ResponseRenderer {

    private static final int MINUTES = 1000 * 60;
    private static final String TRANSFER_ENCODING = "transfer-encoding";
    private static final String CONTENT_LENGTH = "content-length";
    private static final String HOST_HEADER = "host";

    private final HttpClient client;
    private final boolean preserveHostHeader;
    private final String hostHeaderValue;

    public ProxyResponseRenderer(ProxySettings proxySettings, KeyStoreSettings trustStoreSettings,
            boolean preserveHostHeader, String hostHeaderValue) {
        client = HttpClientFactory.createClient(1000, 5 * MINUTES, proxySettings, trustStoreSettings);

        this.preserveHostHeader = preserveHostHeader;
        this.hostHeaderValue = hostHeaderValue;
    }

    public ProxyResponseRenderer() {
        this(ProxySettings.NO_PROXY, KeyStoreSettings.NO_STORE, false, null);
    }

    @Override
    public Response render(ResponseDefinition responseDefinition) {
        HttpUriRequest httpRequest = getHttpRequestFor(responseDefinition);
        addRequestHeaders(httpRequest, responseDefinition);

        try {
            addBodyIfPostPutOrPatch(httpRequest, responseDefinition);
            HttpResponse httpResponse = client.execute(httpRequest);

            return response().status(httpResponse.getStatusLine().getStatusCode())
                    .headers(headersFrom(httpResponse, responseDefinition))
                    .body(getEntityAsByteArrayAndCloseStream(httpResponse)).fromProxy(true).build();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private HttpHeaders headersFrom(HttpResponse httpResponse, ResponseDefinition responseDefinition) {
        List<HttpHeader> httpHeaders = new LinkedList<HttpHeader>();
        for (Header header : httpResponse.getAllHeaders()) {
            httpHeaders.add(new HttpHeader(header.getName(), header.getValue()));
        }

        if (responseDefinition.getHeaders() != null) {
            httpHeaders.addAll(responseDefinition.getHeaders().all());
        }

        return new HttpHeaders(httpHeaders);
    }

    public static HttpUriRequest getHttpRequestFor(ResponseDefinition response) {
        final RequestMethod method = response.getOriginalRequest().getMethod();
        final String url = response.getProxyUrl();
        return HttpClientFactory.getHttpRequestFor(method, url);
    }

    private void addRequestHeaders(HttpRequest httpRequest, ResponseDefinition response) {
        Request originalRequest = response.getOriginalRequest();
        for (String key : originalRequest.getAllHeaderKeys()) {
            if (headerShouldBeTransferred(key)) {
                if (!HOST_HEADER.equalsIgnoreCase(key) || preserveHostHeader) {
                    List<String> values = originalRequest.header(key).values();
                    for (String value : values) {
                        httpRequest.addHeader(key, value);
                    }
                } else {
                    if (hostHeaderValue != null) {
                        httpRequest.addHeader(key, hostHeaderValue);
                    } else if (response.getProxyBaseUrl() != null) {
                        httpRequest.addHeader(key, URI.create(response.getProxyBaseUrl()).getAuthority());
                    }
                }
            }
        }

        if (response.getAdditionalProxyRequestHeaders() != null) {
            for (String key : response.getAdditionalProxyRequestHeaders().keys()) {
                httpRequest.setHeader(key, response.getAdditionalProxyRequestHeaders().getHeader(key).firstValue());
            }
        }
    }

    private static boolean headerShouldBeTransferred(String key) {
        return !ImmutableList.of(CONTENT_LENGTH, TRANSFER_ENCODING, "connection").contains(key.toLowerCase());
    }

    private static void addBodyIfPostPutOrPatch(HttpRequest httpRequest, ResponseDefinition response)
            throws UnsupportedEncodingException {
        Request originalRequest = response.getOriginalRequest();
        if (originalRequest.getMethod().isOneOf(PUT, POST, PATCH)) {
            HttpEntityEnclosingRequest requestWithEntity = (HttpEntityEnclosingRequest) httpRequest;
            requestWithEntity.setEntity(buildEntityFrom(originalRequest));
        }
    }

    private static HttpEntity buildEntityFrom(Request originalRequest) {
        ContentTypeHeader contentTypeHeader = originalRequest.contentTypeHeader().or("text/plain");
        ContentType contentType = ContentType.create(contentTypeHeader.mimeTypePart(),
                contentTypeHeader.encodingPart().or("utf-8"));

        if (originalRequest.containsHeader(TRANSFER_ENCODING)
                && originalRequest.header(TRANSFER_ENCODING).firstValue().equals("chunked")) {
            return new InputStreamEntity(new ByteArrayInputStream(originalRequest.getBody()), -1, contentType);
        }

        return new ByteArrayEntity(originalRequest.getBody());
    }

}