Java tutorial
/* ** ** Copyright 2014, Jules White ** ** */ package com.coursera.androidcapstone.dailyselfie.test; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF 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. */ import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.InetAddress; import java.net.InetSocketAddress; import java.net.Socket; import java.net.UnknownHostException; import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import java.util.zip.GZIPInputStream; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocket; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager; import org.apache.http.Header; import org.apache.http.HeaderElement; import org.apache.http.HttpEntity; import org.apache.http.HttpException; import org.apache.http.HttpRequest; import org.apache.http.HttpRequestInterceptor; import org.apache.http.HttpResponse; import org.apache.http.HttpResponseInterceptor; import org.apache.http.HttpVersion; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.HttpGet; import org.apache.http.conn.ClientConnectionManager; import org.apache.http.conn.ConnectTimeoutException; import org.apache.http.conn.scheme.LayeredSocketFactory; import org.apache.http.conn.scheme.PlainSocketFactory; import org.apache.http.conn.scheme.Scheme; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.conn.scheme.SocketFactory; import org.apache.http.entity.HttpEntityWrapper; import org.apache.http.impl.client.BasicCredentialsProvider; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.HttpContext; /** * Easy to use Http and Https client, that transparently adds gzip compression * and ignores all Https certificates. It can also be used for using credentials * in your connection. * * This class was created for Android applications, where the appropriate apache libraries * are already available. If you are developing for another platform, make sure * to add the httpclient, httpcore and commons-logging libs to your buildpath. * They can be downloaded from http://hc.apache.org/downloads.cgi * * <code><br/> EasyHttpClient client = new EasyHttpClient();<br/> System.out.println(client.get("https://encrypted.google.com/"));<br/> * </code> * * @author match2blue software development GmbH * @author Ren Fischer, Ulrich Scheller */ public class EasyHttpClient extends DefaultHttpClient { /** * Default http port */ private final static int HTTP_PORT = 80; /** * Default https port */ private final static int HTTPS_PORT = 443; protected int lastStatusCode; protected String lastReasonPhrase; /** * Default constructor that initializes gzip handling. It adds the * Accept-Encoding gzip flag and also decompresses the response from the server. */ public EasyHttpClient() { addRequestInterceptor(new HttpRequestInterceptor() { public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException { if (!request.containsHeader("Accept-Encoding")) { request.addHeader("Accept-Encoding", "gzip"); } } }); addResponseInterceptor(new HttpResponseInterceptor() { public void process(final HttpResponse response, final HttpContext context) throws HttpException, IOException { HttpEntity entity = response.getEntity(); Header ceheader = entity.getContentEncoding(); if (ceheader != null) { for (HeaderElement headerElement : ceheader.getElements()) { if (headerElement.getName().equalsIgnoreCase("gzip")) { response.setEntity(new GzipEntityWrapper(response.getEntity())); lastStatusCode = response.getStatusLine().getStatusCode(); lastReasonPhrase = response.getStatusLine().getReasonPhrase(); return; } } } } }); } /** * Constructor which handles credentials for the connection (only if username and password are set) * * @param username * @param password */ public EasyHttpClient(String username, String password) { if (username != null && password != null) { UsernamePasswordCredentials c = new UsernamePasswordCredentials(username, password); BasicCredentialsProvider cP = new BasicCredentialsProvider(); cP.setCredentials(AuthScope.ANY, c); setCredentialsProvider(cP); } } /** * Function that creates a ClientConnectionManager which can handle http and https. * In case of https self signed or invalid certificates will be accepted. */ @Override protected ClientConnectionManager createClientConnectionManager() { HttpParams params = new BasicHttpParams(); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, "utf-8"); params.setBooleanParameter("http.protocol.expect-continue", false); SchemeRegistry registry = new SchemeRegistry(); registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), HTTP_PORT)); registry.register(new Scheme("https", new EasySSLSocketFactory(), HTTPS_PORT)); ThreadSafeClientConnManager manager = new ThreadSafeClientConnManager(params, registry); return manager; } /** * Make a get request to the specified url * @param url * @return the response string, null if there was an error */ public String get(String url) { HttpGet getReq = new HttpGet(url); InputStream content = null; try { content = execute(getReq).getEntity().getContent(); ByteArrayOutputStream bout = new ByteArrayOutputStream(); byte[] buf = new byte[1024]; int len; while ((len = content.read(buf)) > 0) { bout.write(buf, 0, len); } content.close(); return bout.toString(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } public static void main(String[] args) { EasyHttpClient client = new EasyHttpClient(); System.out.println(client.get("https://encrypted.google.com/")); } } class GzipEntityWrapper extends HttpEntityWrapper { public GzipEntityWrapper(HttpEntity wrapped) { super(wrapped); } @Override public InputStream getContent() throws IOException, IllegalStateException { return new GZIPInputStream(wrappedEntity.getContent()); } } /** * This socket factory will create ssl socket that accepts self signed * certificate */ class EasySSLSocketFactory implements SocketFactory, LayeredSocketFactory { private SSLContext sslcontext = null; private static SSLContext createEasySSLContext() throws IOException { try { SSLContext context = SSLContext.getInstance("TLS"); context.init(null, new TrustManager[] { new TrivialTrustManager() }, null); return context; } catch (Exception e) { throw new IOException(e.getMessage()); } } private SSLContext getSSLContext() throws IOException { if (this.sslcontext == null) { this.sslcontext = createEasySSLContext(); } return this.sslcontext; } /** * @see org.apache.http.conn.scheme.SocketFactory#connectSocket(java.net.Socket, * java.lang.String, int, java.net.InetAddress, int, * org.apache.http.params.HttpParams) */ public Socket connectSocket(Socket sock, String host, int port, InetAddress localAddress, int localPort, HttpParams params) throws IOException, UnknownHostException, ConnectTimeoutException { int connTimeout = HttpConnectionParams.getConnectionTimeout(params); int soTimeout = HttpConnectionParams.getSoTimeout(params); InetSocketAddress remoteAddress = new InetSocketAddress(host, port); SSLSocket sslsock = (SSLSocket) ((sock != null) ? sock : createSocket()); if ((localAddress != null) || (localPort > 0)) { // we need to bind explicitly if (localPort < 0) { localPort = 0; // indicates "any" } InetSocketAddress isa = new InetSocketAddress(localAddress, localPort); sslsock.bind(isa); } sslsock.connect(remoteAddress, connTimeout); sslsock.setSoTimeout(soTimeout); return sslsock; } /** * @see org.apache.http.conn.scheme.SocketFactory#createSocket() */ public Socket createSocket() throws IOException { return getSSLContext().getSocketFactory().createSocket(); } /** * @see org.apache.http.conn.scheme.SocketFactory#isSecure(java.net.Socket) */ public boolean isSecure(Socket socket) throws IllegalArgumentException { return true; } /** * @see org.apache.http.conn.scheme.LayeredSocketFactory#createSocket(java.net.Socket, * java.lang.String, int, boolean) */ public Socket createSocket(Socket socket, String host, int port, boolean autoClose) throws IOException, UnknownHostException { return getSSLContext().getSocketFactory().createSocket(socket, host, port, autoClose); } // ------------------------------------------------------------------- // javadoc in org.apache.http.conn.scheme.SocketFactory says : // Both Object.equals() and Object.hashCode() must be overridden // for the correct operation of some connection managers // ------------------------------------------------------------------- public boolean equals(Object obj) { return ((obj != null) && obj.getClass() == this.getClass()); } public int hashCode() { return EasySSLSocketFactory.class.hashCode(); } } class TrivialTrustManager implements X509TrustManager { public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { } public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { } public X509Certificate[] getAcceptedIssuers() { return new X509Certificate[0]; } }