Java tutorial
package com.github.dockerjava.jaxrs.connector; /* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2010-2014 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * http://glassfish.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ import java.io.BufferedInputStream; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.Closeable; import java.io.FilterInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.URI; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.concurrent.Future; import java.util.concurrent.atomic.AtomicLong; import java.util.logging.Level; import java.util.logging.Logger; import javax.ws.rs.ProcessingException; import javax.ws.rs.core.Configuration; import javax.ws.rs.core.HttpHeaders; import javax.ws.rs.core.MultivaluedMap; import javax.ws.rs.core.Response; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocketFactory; import org.glassfish.jersey.SslConfigurator; import org.glassfish.jersey.apache.connector.ApacheClientProperties; import org.glassfish.jersey.apache.connector.LocalizationMessages; import org.glassfish.jersey.client.ClientProperties; import org.glassfish.jersey.client.ClientRequest; import org.glassfish.jersey.client.ClientResponse; import org.glassfish.jersey.client.RequestEntityProcessing; import org.glassfish.jersey.client.spi.AsyncConnectorCallback; import org.glassfish.jersey.client.spi.Connector; import org.glassfish.jersey.internal.util.PropertiesHelper; import org.glassfish.jersey.message.internal.HeaderUtils; import org.glassfish.jersey.message.internal.OutboundMessageContext; import org.glassfish.jersey.message.internal.ReaderWriter; import org.glassfish.jersey.message.internal.Statuses; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpHost; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.client.AuthCache; import org.apache.http.client.CookieStore; import org.apache.http.client.CredentialsProvider; import org.apache.http.client.HttpClient; import org.apache.http.client.config.CookieSpecs; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.client.methods.RequestBuilder; import org.apache.http.client.protocol.HttpClientContext; import org.apache.http.config.ConnectionConfig; import org.apache.http.config.Registry; import org.apache.http.config.RegistryBuilder; import org.apache.http.conn.HttpClientConnectionManager; import org.apache.http.conn.ManagedHttpClientConnection; import org.apache.http.conn.routing.HttpRoute; import org.apache.http.conn.socket.ConnectionSocketFactory; import org.apache.http.conn.socket.LayeredConnectionSocketFactory; import org.apache.http.conn.socket.PlainConnectionSocketFactory; import org.apache.http.conn.ssl.SSLConnectionSocketFactory; import org.apache.http.conn.ssl.SSLContexts; import org.apache.http.conn.ssl.X509HostnameVerifier; import org.apache.http.entity.AbstractHttpEntity; import org.apache.http.entity.BufferedHttpEntity; import org.apache.http.entity.ContentLengthStrategy; import org.apache.http.impl.auth.BasicScheme; import org.apache.http.impl.client.BasicAuthCache; import org.apache.http.impl.client.BasicCookieStore; import org.apache.http.impl.client.BasicCredentialsProvider; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.conn.DefaultManagedHttpClientConnection; import org.apache.http.impl.conn.ManagedHttpClientConnectionFactory; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.apache.http.impl.io.ChunkedOutputStream; import org.apache.http.io.SessionOutputBuffer; import org.apache.http.util.TextUtils; import org.apache.http.util.VersionInfo; import jersey.repackaged.com.google.common.util.concurrent.MoreExecutors; /** * A {@link Connector} that utilizes the Apache HTTP Client to send and receive * HTTP request and responses. * <p/> * The following properties are only supported at construction of this class: * <ul> * <li>{@link ApacheClientProperties#CONNECTION_MANAGER}</li> * <li>{@link ApacheClientProperties#REQUEST_CONFIG}</li> * <li>{@link ApacheClientProperties#CREDENTIALS_PROVIDER}</li> * <li>{@link ApacheClientProperties#DISABLE_COOKIES}</li> * <li>{@link ClientProperties#PROXY_URI}</li> * <li>{@link ClientProperties#PROXY_USERNAME}</li> * <li>{@link ClientProperties#PROXY_PASSWORD}</li> * <li>{@link ClientProperties#REQUEST_ENTITY_PROCESSING} - default value is {@link RequestEntityProcessing#CHUNKED}</li> * <li>{@link ApacheClientProperties#PREEMPTIVE_BASIC_AUTHENTICATION}</li> * <li>{@link ApacheClientProperties#SSL_CONFIG}</li> * </ul> * <p> * This connector uses {@link RequestEntityProcessing#CHUNKED chunked encoding} as a default setting. This can * be overridden by the {@link ClientProperties#REQUEST_ENTITY_PROCESSING}. By default the * {@link ClientProperties#CHUNKED_ENCODING_SIZE} property is only supported by using default connection manager. If custom * connection manager needs to be used then chunked encoding size can be set by providing a custom * {@link org.apache.http.HttpClientConnection} (via custom {@link org.apache.http.impl.conn.ManagedHttpClientConnectionFactory}) * and overriding {@code createOutputStream} method. * </p> * <p> * Using of authorization is dependent on the chunk encoding setting. If the entity * buffering is enabled, the entity is buffered and authorization can be performed * automatically in response to a 401 by sending the request again. When entity buffering * is disabled (chunked encoding is used) then the property * {@link org.glassfish.jersey.apache.connector.ApacheClientProperties#PREEMPTIVE_BASIC_AUTHENTICATION} must * be set to {@code true}. * </p> * <p> * If a {@link org.glassfish.jersey.client.ClientResponse} is obtained and an * entity is not read from the response then * {@link org.glassfish.jersey.client.ClientResponse#close()} MUST be called * after processing the response to release connection-based resources. * </p> * <p> * Client operations are thread safe, the HTTP connection may * be shared between different threads. * </p> * <p> * If a response entity is obtained that is an instance of {@link Closeable} * then the instance MUST be closed after processing the entity to release * connection-based resources. * </p> * <p> * The following methods are currently supported: HEAD, GET, POST, PUT, DELETE, OPTIONS, PATCH and TRACE. * </p> * * @author jorgeluisw@mac.com * @author Paul Sandoz (paul.sandoz at oracle.com) * @author Pavel Bucek (pavel.bucek at oracle.com) * @author Arul Dhesiaseelan (aruld at acm.org) * @see ApacheClientProperties#CONNECTION_MANAGER */ class ApacheConnector implements Connector { private final static Logger LOGGER = Logger.getLogger(ApacheConnector.class.getName()); private static final VersionInfo vi; private static final String release; static { vi = VersionInfo.loadVersionInfo("org.apache.http.client", HttpClientBuilder.class.getClassLoader()); release = (vi != null) ? vi.getRelease() : VersionInfo.UNAVAILABLE; } private final CloseableHttpClient client; private final CookieStore cookieStore; private final boolean preemptiveBasicAuth; private final RequestConfig requestConfig; /** * Create the new Apache HTTP Client connector. * * @param config client configuration. */ ApacheConnector(Configuration config) { Object reqConfig = null; if (config != null) { final Object connectionManager = config.getProperties().get(ApacheClientProperties.CONNECTION_MANAGER); if (connectionManager != null) { if (!(connectionManager instanceof HttpClientConnectionManager)) { LOGGER.log(Level.WARNING, LocalizationMessages.IGNORING_VALUE_OF_PROPERTY( ApacheClientProperties.CONNECTION_MANAGER, connectionManager.getClass().getName(), HttpClientConnectionManager.class.getName())); } } reqConfig = config.getProperties().get(ApacheClientProperties.REQUEST_CONFIG); if (reqConfig != null) { if (!(reqConfig instanceof RequestConfig)) { LOGGER.log(Level.WARNING, LocalizationMessages.IGNORING_VALUE_OF_PROPERTY(ApacheClientProperties.REQUEST_CONFIG, reqConfig.getClass().getName(), RequestConfig.class.getName())); reqConfig = null; } } } final SSLContext sslContext = getSslContext(config); final HttpClientBuilder clientBuilder = HttpClientBuilder.create(); clientBuilder.setConnectionManager(getConnectionManager(config, sslContext)); clientBuilder.setSslcontext(sslContext); final RequestConfig.Builder requestConfigBuilder = RequestConfig.custom(); int connectTimeout = 0; int socketTimeout = 0; boolean ignoreCookies = false; if (config != null) { connectTimeout = ClientProperties.getValue(config.getProperties(), ClientProperties.CONNECT_TIMEOUT, 0); socketTimeout = ClientProperties.getValue(config.getProperties(), ClientProperties.READ_TIMEOUT, 0); ignoreCookies = PropertiesHelper.isProperty(config.getProperties(), ApacheClientProperties.DISABLE_COOKIES); final Object credentialsProvider = config.getProperty(ApacheClientProperties.CREDENTIALS_PROVIDER); if (credentialsProvider != null && (credentialsProvider instanceof CredentialsProvider)) { clientBuilder.setDefaultCredentialsProvider((CredentialsProvider) credentialsProvider); } Object proxyUri; proxyUri = config.getProperty(ClientProperties.PROXY_URI); if (proxyUri != null) { final URI u = getProxyUri(proxyUri); final HttpHost proxy = new HttpHost(u.getHost(), u.getPort(), u.getScheme()); String userName; userName = ClientProperties.getValue(config.getProperties(), ClientProperties.PROXY_USERNAME, String.class); if (userName != null) { String password; password = ClientProperties.getValue(config.getProperties(), ClientProperties.PROXY_PASSWORD, String.class); if (password != null) { final CredentialsProvider credsProvider = new BasicCredentialsProvider(); credsProvider.setCredentials(new AuthScope(u.getHost(), u.getPort()), new UsernamePasswordCredentials(userName, password)); clientBuilder.setDefaultCredentialsProvider(credsProvider); } } clientBuilder.setProxy(proxy); } final Boolean preemptiveBasicAuthProperty = (Boolean) config.getProperties() .get(ApacheClientProperties.PREEMPTIVE_BASIC_AUTHENTICATION); this.preemptiveBasicAuth = (preemptiveBasicAuthProperty != null) ? preemptiveBasicAuthProperty : false; } else { this.preemptiveBasicAuth = false; } if (reqConfig != null) { RequestConfig.Builder reqConfigBuilder = RequestConfig.copy((RequestConfig) reqConfig); if (connectTimeout > 0) { reqConfigBuilder.setConnectTimeout(connectTimeout); } if (socketTimeout > 0) { reqConfigBuilder.setSocketTimeout(socketTimeout); } if (ignoreCookies) { reqConfigBuilder.setCookieSpec(CookieSpecs.IGNORE_COOKIES); } requestConfig = reqConfigBuilder.build(); } else { requestConfigBuilder.setConnectTimeout(connectTimeout); requestConfigBuilder.setSocketTimeout(socketTimeout); if (ignoreCookies) { requestConfigBuilder.setCookieSpec(CookieSpecs.IGNORE_COOKIES); } requestConfig = requestConfigBuilder.build(); } if (requestConfig.getCookieSpec() == null || !requestConfig.getCookieSpec().equals(CookieSpecs.IGNORE_COOKIES)) { this.cookieStore = new BasicCookieStore(); clientBuilder.setDefaultCookieStore(cookieStore); } else { this.cookieStore = null; } clientBuilder.setDefaultRequestConfig(requestConfig); this.client = clientBuilder.build(); } private SSLContext getSslContext(final Configuration config) { final SslConfigurator sslConfigurator = ApacheClientProperties.getValue(config.getProperties(), ApacheClientProperties.SSL_CONFIG, SslConfigurator.class); return sslConfigurator != null ? sslConfigurator.createSSLContext() : null; } HttpClientConnectionManager getConnectionManager(final Configuration config, final SSLContext sslContext) { final Object cmObject = config.getProperties().get(ApacheClientProperties.CONNECTION_MANAGER); // Connection manager from configuration. if (cmObject != null) { if (cmObject instanceof HttpClientConnectionManager) { return (HttpClientConnectionManager) cmObject; } else { LOGGER.log(Level.WARNING, LocalizationMessages.IGNORING_VALUE_OF_PROPERTY(ApacheClientProperties.CONNECTION_MANAGER, cmObject.getClass().getName(), HttpClientConnectionManager.class.getName())); } } // Create custom connection manager. return createConnectionManager(config, sslContext, null, false); } private HttpClientConnectionManager createConnectionManager(final Configuration config, final SSLContext sslContext, X509HostnameVerifier hostnameVerifier, final boolean useSystemProperties) { final String[] supportedProtocols = useSystemProperties ? split(System.getProperty("https.protocols")) : null; final String[] supportedCipherSuites = useSystemProperties ? split(System.getProperty("https.cipherSuites")) : null; if (hostnameVerifier == null) { hostnameVerifier = SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER; } final LayeredConnectionSocketFactory sslSocketFactory; if (sslContext != null) { sslSocketFactory = new SSLConnectionSocketFactory(sslContext, supportedProtocols, supportedCipherSuites, hostnameVerifier); } else { if (useSystemProperties) { sslSocketFactory = new SSLConnectionSocketFactory((SSLSocketFactory) SSLSocketFactory.getDefault(), supportedProtocols, supportedCipherSuites, hostnameVerifier); } else { sslSocketFactory = new SSLConnectionSocketFactory(SSLContexts.createDefault(), hostnameVerifier); } } final Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create() .register("http", PlainConnectionSocketFactory.getSocketFactory()) .register("https", sslSocketFactory).build(); final Integer chunkSize = ClientProperties.getValue(config.getProperties(), ClientProperties.CHUNKED_ENCODING_SIZE, 4096, Integer.class); final PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager( registry, new ConnectionFactory(chunkSize)); if (useSystemProperties) { String s = System.getProperty("http.keepAlive", "true"); if ("true".equalsIgnoreCase(s)) { s = System.getProperty("http.maxConnections", "5"); final int max = Integer.parseInt(s); connectionManager.setDefaultMaxPerRoute(max); connectionManager.setMaxTotal(2 * max); } } return connectionManager; } private static String[] split(final String s) { if (TextUtils.isBlank(s)) { return null; } return s.split(" *, *"); } /** * Get the {@link HttpClient}. * * @return the {@link HttpClient}. */ public HttpClient getHttpClient() { return client; } /** * Get the {@link CookieStore}. * * @return the {@link CookieStore} instance or {@code null} when {@value ApacheClientProperties#DISABLE_COOKIES} set to * {@code true}. */ public CookieStore getCookieStore() { return cookieStore; } private static URI getProxyUri(final Object proxy) { if (proxy instanceof URI) { return (URI) proxy; } else if (proxy instanceof String) { return URI.create((String) proxy); } else { throw new ProcessingException(LocalizationMessages.WRONG_PROXY_URI_TYPE(ClientProperties.PROXY_URI)); } } @Override public ClientResponse apply(final ClientRequest clientRequest) throws ProcessingException { final HttpUriRequest request = getUriHttpRequest(clientRequest); final Map<String, String> clientHeadersSnapshot = writeOutBoundHeaders(clientRequest.getHeaders(), request); try { final CloseableHttpResponse response; final HttpClientContext context = HttpClientContext.create(); if (preemptiveBasicAuth) { final AuthCache authCache = new BasicAuthCache(); final BasicScheme basicScheme = new BasicScheme(); authCache.put(getHost(request), basicScheme); context.setAuthCache(authCache); } response = client.execute(getHost(request), request, context); HeaderUtils.checkHeaderChanges(clientHeadersSnapshot, clientRequest.getHeaders(), this.getClass().getName()); final Response.StatusType status = response.getStatusLine().getReasonPhrase() == null ? Statuses.from(response.getStatusLine().getStatusCode()) : Statuses.from(response.getStatusLine().getStatusCode(), response.getStatusLine().getReasonPhrase()); final ClientResponse responseContext = new ApacheConnectorClientResponse(status, clientRequest, response); final List<URI> redirectLocations = context.getRedirectLocations(); if (redirectLocations != null && !redirectLocations.isEmpty()) { responseContext.setResolvedRequestUri(redirectLocations.get(redirectLocations.size() - 1)); } final Header[] respHeaders = response.getAllHeaders(); final MultivaluedMap<String, String> headers = responseContext.getHeaders(); for (final Header header : respHeaders) { final String headerName = header.getName(); List<String> list = headers.get(headerName); if (list == null) { list = new ArrayList<String>(); } list.add(header.getValue()); headers.put(headerName, list); } final HttpEntity entity = response.getEntity(); if (entity != null) { if (headers.get(HttpHeaders.CONTENT_LENGTH) == null) { headers.add(HttpHeaders.CONTENT_LENGTH, String.valueOf(entity.getContentLength())); } final Header contentEncoding = entity.getContentEncoding(); if (headers.get(HttpHeaders.CONTENT_ENCODING) == null && contentEncoding != null) { headers.add(HttpHeaders.CONTENT_ENCODING, contentEncoding.getValue()); } } try { responseContext.setEntityStream(new HttpClientResponseInputStream(response)); } catch (final IOException e) { LOGGER.log(Level.SEVERE, null, e); } return responseContext; } catch (final Exception e) { throw new ProcessingException(e); } } @Override public Future<?> apply(final ClientRequest request, final AsyncConnectorCallback callback) { return MoreExecutors.sameThreadExecutor().submit(new Runnable() { @Override public void run() { try { callback.response(apply(request)); } catch (final ProcessingException ex) { callback.failure(ex); } catch (final Throwable t) { callback.failure(t); } } }); } @Override public String getName() { return "Apache HttpClient " + release; } @Override public void close() { try { client.close(); } catch (final IOException e) { throw new ProcessingException(LocalizationMessages.FAILED_TO_STOP_CLIENT(), e); } } private HttpHost getHost(final HttpUriRequest request) { return new HttpHost(request.getURI().getHost(), request.getURI().getPort(), request.getURI().getScheme()); } private HttpUriRequest getUriHttpRequest(final ClientRequest clientRequest) { final Boolean redirectsEnabled = clientRequest.resolveProperty(ClientProperties.FOLLOW_REDIRECTS, requestConfig.isRedirectsEnabled()); final RequestConfig config = RequestConfig.copy(requestConfig).setRedirectsEnabled(redirectsEnabled) .build(); final Boolean bufferingEnabled = clientRequest.resolveProperty(ClientProperties.REQUEST_ENTITY_PROCESSING, RequestEntityProcessing.class) == RequestEntityProcessing.BUFFERED; final HttpEntity entity = getHttpEntity(clientRequest, bufferingEnabled); return RequestBuilder.create(clientRequest.getMethod()).setUri(clientRequest.getUri()).setConfig(config) .setEntity(entity).build(); } private HttpEntity getHttpEntity(final ClientRequest clientRequest, final boolean bufferingEnabled) { final Object entity = clientRequest.getEntity(); if (entity == null) { return null; } final AbstractHttpEntity httpEntity = new AbstractHttpEntity() { @Override public boolean isRepeatable() { return false; } @Override public long getContentLength() { return -1; } @Override public InputStream getContent() throws IOException, IllegalStateException { if (bufferingEnabled) { final ByteArrayOutputStream buffer = new ByteArrayOutputStream(512); writeTo(buffer); return new ByteArrayInputStream(buffer.toByteArray()); } else { return null; } } @Override public void writeTo(final OutputStream outputStream) throws IOException { clientRequest.setStreamProvider(new OutboundMessageContext.StreamProvider() { @Override public OutputStream getOutputStream(final int contentLength) throws IOException { return outputStream; } }); clientRequest.writeEntity(); } @Override public boolean isStreaming() { return false; } }; if (bufferingEnabled) { try { return new BufferedHttpEntity(httpEntity); } catch (final IOException e) { throw new ProcessingException(LocalizationMessages.ERROR_BUFFERING_ENTITY(), e); } } else { return httpEntity; } } private static Map<String, String> writeOutBoundHeaders(final MultivaluedMap<String, Object> headers, final HttpUriRequest request) { Map<String, String> stringHeaders = HeaderUtils.asStringHeadersSingleValue(headers); for (Map.Entry<String, String> e : stringHeaders.entrySet()) { request.addHeader(e.getKey(), e.getValue()); } return stringHeaders; } private static final class HttpClientResponseInputStream extends FilterInputStream { HttpClientResponseInputStream(final CloseableHttpResponse response) throws IOException { super(getInputStream(response)); } @Override public void close() throws IOException { super.close(); } } private static InputStream getInputStream(final CloseableHttpResponse response) throws IOException { if (response.getEntity() == null) { return new ByteArrayInputStream(new byte[0]); } else { final InputStream i = response.getEntity().getContent(); if (i.markSupported()) { return i; } return new BufferedInputStream(i, ReaderWriter.BUFFER_SIZE); } } private static class ConnectionFactory extends ManagedHttpClientConnectionFactory { private static final AtomicLong COUNTER = new AtomicLong(); private final int chunkSize; private ConnectionFactory(final int chunkSize) { this.chunkSize = chunkSize; } @Override public ManagedHttpClientConnection create(final HttpRoute route, final ConnectionConfig config) { final String id = "http-outgoing-" + Long.toString(COUNTER.getAndIncrement()); return new HttpClientConnection(id, config.getBufferSize(), chunkSize); } } private static class HttpClientConnection extends DefaultManagedHttpClientConnection { private final int chunkSize; private HttpClientConnection(final String id, final int buffersize, final int chunkSize) { super(id, buffersize); this.chunkSize = chunkSize; } @Override protected OutputStream createOutputStream(final long len, final SessionOutputBuffer outbuffer) { if (len == ContentLengthStrategy.CHUNKED) { return new ChunkedOutputStream(chunkSize, outbuffer); } return super.createOutputStream(len, outbuffer); } } }