Java tutorial
/* * 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. * * Contributions from 2013-2017 where performed either by US government * employees, or under US Veterans Health Administration contracts. * * US Veterans Health Administration contributions by government employees * are work of the U.S. Government and are not subject to copyright * protection in the United States. Portions contributed by government * employees are USGovWork (17USC 105). Not subject to copyright. * * Contribution by contractors to the US Veterans Health Administration * during this period are contractually contributed under the * Apache License, Version 2.0. * * See: https://www.usa.gov/government-works * * Contributions prior to 2013: * * Copyright (C) International Health Terminology Standards Development Organisation. * Licensed under the Apache License, Version 2.0. * */ package sh.isaac.provider.sync.git.gitblit.utils; //~--- JDK imports ------------------------------------------------------------ import java.io.IOException; import java.net.URL; import java.net.URLConnection; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.charset.Charset; import java.util.Arrays; import java.util.Base64; //~--- non-JDK imports -------------------------------------------------------- import org.apache.commons.lang3.ArrayUtils; //~--- classes ---------------------------------------------------------------- /** * Utility class for establishing HTTP/HTTPS connections. * * */ public class ConnectionUtils { /** The Constant CHARSET. */ static final String CHARSET; //~--- static initializers ------------------------------------------------- static { CHARSET = "UTF-8"; // Disable Java 7 SNI checks // http://stackoverflow.com/questions/7615645/ssl-handshake-alert-unrecognized-name-error-since-upgrade-to-java-1-7-0 System.setProperty("jsse.enableSNIExtension", "false"); } //~--- methods ------------------------------------------------------------- /** * Open connection. * * @param url the url * @param username the username * @param password the password * @return the URL connection * @throws IOException Signals that an I/O exception has occurred. */ public static URLConnection openConnection(String url, String username, char[] password) throws IOException { final URL urlObject = new URL(url); final URLConnection conn = urlObject.openConnection(); setAuthorization(conn, username, password); conn.setUseCaches(false); conn.setDoOutput(true); return conn; } /** * Open read connection. * * @param url the url * @param username the username * @param password the password * @return the URL connection * @throws IOException Signals that an I/O exception has occurred. */ public static URLConnection openReadConnection(String url, String username, char[] password) throws IOException { final URLConnection conn = openConnection(url, username, password); conn.setRequestProperty("Accept-Charset", ConnectionUtils.CHARSET); return conn; } /** * To bytes. * * @param chars the chars * @return the byte[] */ private static byte[] toBytes(char[] chars) { final CharBuffer charBuffer = CharBuffer.wrap(chars); final ByteBuffer byteBuffer = Charset.forName("UTF-8").encode(charBuffer); final byte[] bytes = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit()); Arrays.fill(charBuffer.array(), '\u0000'); // clear sensitive data Arrays.fill(byteBuffer.array(), (byte) 0); // clear sensitive data return bytes; } //~--- set methods --------------------------------------------------------- /** * Set authorization. * * @param conn the conn * @param username the username * @param password the password */ public static void setAuthorization(URLConnection conn, String username, char[] password) { if (!StringUtils.isEmpty(username) && ((password != null) && (password.length > 0))) { conn.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString( toBytes(ArrayUtils.addAll(new String(username + ":").toCharArray(), password)))); } } }