org.openqa.selenium.remote.internal.ApacheHttpAsyncClient.java Source code

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// This is the modified version of the ApacheHttpClient in selenium-remote-driver.
//
// The following copyright is copied from original.
// ---
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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.openqa.selenium.remote.internal;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;
import org.openqa.selenium.WebDriverException;
import org.openqa.selenium.remote.http.HttpClient;
import org.openqa.selenium.remote.http.HttpMethod;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

import static com.google.common.base.Preconditions.*;
import static org.apache.http.protocol.HttpCoreContext.*;

/**
 * Replacement of ApacheHttpClient in selenium-remote-driver.
 */
public class ApacheHttpAsyncClient implements HttpClient {

    private static final int MAX_REDIRECTS = 10;

    private final URL url;
    private final HttpHost targetHost;
    private final CloseableHttpAsyncClient client;

    /**
     * Constructor.
     *
     * @param client client.
     * @param url url.
     */
    public ApacheHttpAsyncClient(CloseableHttpAsyncClient client, URL url) {
        this.client = checkNotNull(client, "null HttpClient");
        this.url = checkNotNull(url, "null URL");

        // Some machines claim "localhost.localdomain" is the same as "localhost".
        // This assumption is not always true.
        String host = url.getHost().replace(".localdomain", "");
        this.targetHost = new HttpHost(host, url.getPort(), url.getProtocol());
    }

    @Override
    public HttpResponse execute(HttpRequest request, boolean followRedirects) throws IOException {
        HttpContext context = createContext();

        String requestUrl = url.toExternalForm().replaceAll("/$", "") + request.getUri();
        HttpUriRequest httpMethod = createHttpUriRequest(request.getMethod(), requestUrl);
        for (String name : request.getHeaderNames()) {
            // Skip content length as it is implicitly set when the message entity is set below.
            if (!"Content-Length".equalsIgnoreCase(name)) {
                for (String value : request.getHeaders(name)) {
                    httpMethod.addHeader(name, value);
                }
            }
        }

        if (httpMethod instanceof HttpPost) {
            ((HttpPost) httpMethod).setEntity(new ByteArrayEntity(request.getContent()));
        }
        client.start(); // start if needed
        Future<org.apache.http.HttpResponse> future = client.execute(targetHost, httpMethod, context, null);
        try {
            org.apache.http.HttpResponse response = future.get();

            if (followRedirects) {
                response = followRedirects(client, context, response, /* redirect count */0);
            }
            return createResponse(response, context);
        } catch (InterruptedException | ExecutionException e) {
            throw new WebDriverException(e);
        }
    }

    /** Same implementation as {@link ApacheHttpClient#createResponse(org.apache.http.HttpResponse, HttpContext)} */
    private HttpResponse createResponse(org.apache.http.HttpResponse response, HttpContext context)
            throws IOException {
        HttpResponse internalResponse = new HttpResponse();

        internalResponse.setStatus(response.getStatusLine().getStatusCode());
        for (Header header : response.getAllHeaders()) {
            for (HeaderElement headerElement : header.getElements()) {
                internalResponse.addHeader(header.getName(), headerElement.getValue());
            }
        }

        HttpEntity entity = response.getEntity();
        if (entity != null) {
            try {
                internalResponse.setContent(EntityUtils.toByteArray(entity));
            } finally {
                EntityUtils.consume(entity);
            }
        }

        Object host = context.getAttribute(HTTP_TARGET_HOST);
        if (host instanceof HttpHost) {
            internalResponse.setTargetHost(((HttpHost) host).toURI());
        }

        return internalResponse;
    }

    /* (non-Javadoc)
     * @see ApacheHttpClient#createContext()
     */
    protected HttpContext createContext() {
        return new BasicHttpContext();
    }

    /* (non-Javadoc)
     * see ApacheHttpClient#createHttpUriRequest(HttpMethod, String)
     */
    private static HttpUriRequest createHttpUriRequest(HttpMethod method, String url) {
        switch (method) {
        case DELETE:
            return new HttpDelete(url);
        case GET:
            return new HttpGet(url);
        case POST:
            return new HttpPost(url);
        }
        throw new AssertionError("Unsupported method: " + method);
    }

    private org.apache.http.HttpResponse followRedirects(CloseableHttpAsyncClient client, HttpContext context,
            org.apache.http.HttpResponse response, int redirectCount) {
        if (!isRedirect(response)) {
            return response;
        }

        try {
            // Make sure that the previous connection is freed.
            HttpEntity httpEntity = response.getEntity();
            if (httpEntity != null) {
                EntityUtils.consume(httpEntity);
            }
        } catch (IOException e) {
            throw new WebDriverException(e);
        }

        if (redirectCount > MAX_REDIRECTS) {
            throw new WebDriverException("Maximum number of redirects exceeded. Aborting");
        }

        String location = response.getFirstHeader("location").getValue();
        URI uri;
        try {
            uri = buildUri(context, location);
        } catch (URISyntaxException e) {
            throw new WebDriverException(e);
        }
        HttpGet get = new HttpGet(uri);
        get.setHeader("Accept", "application/json; charset=utf-8");

        Future<org.apache.http.HttpResponse> future = client.execute(targetHost, get, context, null);
        try {
            org.apache.http.HttpResponse newResponse = future.get();
            return followRedirects(client, context, newResponse, redirectCount + 1);
        } catch (InterruptedException | ExecutionException e) {
            throw new WebDriverException(e);
        }
    }

    private URI buildUri(HttpContext context, String location) throws URISyntaxException {
        URI uri;
        uri = new URI(location);
        if (!uri.isAbsolute()) {
            HttpHost host = (HttpHost) context.getAttribute(HTTP_TARGET_HOST);
            uri = new URI(host.toURI() + location);
        }
        return uri;
    }

    private boolean isRedirect(org.apache.http.HttpResponse response) {
        int code = response.getStatusLine().getStatusCode();

        return (code == 301 || code == 302 || code == 303 || code == 307) && response.containsHeader("location");
    }

    @Override
    public void close() throws IOException {
        client.close();
    }
}