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	/*
	* Copyright (c) 2003, 2018 Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package sun.net.spi;

	import java.net.InetSocketAddress;
	import java.net.Proxy;
	import java.net.ProxySelector;
	import java.net.SocketAddress;
	import java.net.URI;
	import java.util.Collections;
	import java.util.List;
	import java.io.IOException;
	import java.security.AccessController;
	import java.security.PrivilegedAction;
	import java.util.StringJoiner;
	import java.util.regex.Pattern;
	import java.util.stream.Stream;
	import sun.net.NetProperties;
	import sun.net.SocksProxy;
	import static java.util.regex.Pattern.quote;
	import static java.util.stream.Collectors.collectingAndThen;
	import static java.util.stream.Collectors.toList;

	/**
	* Supports proxy settings using system properties This proxy selector
	* provides backward compatibility with the old http protocol handler
	* as far as how proxy is set
	*
	* Most of the implementation copied from the old http protocol handler
	*
	* Supports http/https/ftp.proxyHost, http/https/ftp.proxyPort,
	* proxyHost, proxyPort, and http/https/ftp.nonProxyHost, and socks.
	* NOTE: need to do gopher as well
	*/
	public class DefaultProxySelector extends ProxySelector {

	/**
	* This is where we define all the valid System Properties we have to
	* support for each given protocol.
	* The format of this 2 dimensional array is :
	* - 1 row per protocol (http, ftp, ...)
	* - 1st element of each row is the protocol name
	* - subsequent elements are prefixes for Host & Port properties
	* listed in order of priority.
	* Example:
	* {"ftp", "ftp.proxy", "ftpProxy", "proxy", "socksProxy"},
	* means for FTP we try in that oder:
	* + ftp.proxyHost & ftp.proxyPort
	* + ftpProxyHost & ftpProxyPort
	* + proxyHost & proxyPort
	* + socksProxyHost & socksProxyPort
	*
	* Note that the socksProxy should always be the last on the list
	*/
	static final String[][] props = {
	/*
	* protocol, Property prefix 1, Property prefix 2, ...
	*/
	{"http", "http.proxy", "proxy", "socksProxy"},
	{"https", "https.proxy", "proxy", "socksProxy"},
	{"ftp", "ftp.proxy", "ftpProxy", "proxy", "socksProxy"},
	{"gopher", "gopherProxy", "socksProxy"},
	{"socket", "socksProxy"}
	};

	private static final String SOCKS_PROXY_VERSION = "socksProxyVersion";

	private static boolean hasSystemProxies = false;

	private static final List<Proxy> NO_PROXY_LIST = List.of(Proxy.NO_PROXY);

	static {
	final String key = "java.net.useSystemProxies";
	Boolean b = AccessController.doPrivileged(
	new PrivilegedAction<Boolean>() {
	public Boolean run() {
	return NetProperties.getBoolean(key);
	}});
	if (b != null && b.booleanValue()) {
	java.security.AccessController.doPrivileged(
	new java.security.PrivilegedAction<Void>() {
	public Void run() {
	System.loadLibrary("net");
	return null;
	}
	});
	hasSystemProxies = init();
	}
	}

	public static int socksProxyVersion() {
	return AccessController.doPrivileged(
	new PrivilegedAction<Integer>() {
	@Override public Integer run() {
	return NetProperties.getInteger(SOCKS_PROXY_VERSION, 5);
	}
	});
	}

	/**
	* How to deal with "non proxy hosts":
	* since we do have to generate a pattern we don't want to do that if
	* it's not necessary. Therefore we do cache the result, on a per-protocol
	* basis, and change it only when the "source", i.e. the system property,
	* did change.
	*/

	static class NonProxyInfo {
	// Default value for nonProxyHosts, this provides backward compatibility
	// by excluding localhost and its litteral notations.
	static final String defStringVal = "localhost\|127.*\|[::1]\|0.0.0.0\|[::0]";

	String hostsSource;
	Pattern pattern;
	final String property;
	final String defaultVal;
	static NonProxyInfo ftpNonProxyInfo = new NonProxyInfo("ftp.nonProxyHosts", null, null, defStringVal);
	static NonProxyInfo httpNonProxyInfo = new NonProxyInfo("http.nonProxyHosts", null, null, defStringVal);
	static NonProxyInfo socksNonProxyInfo = new NonProxyInfo("socksNonProxyHosts", null, null, defStringVal);

	NonProxyInfo(String p, String s, Pattern pattern, String d) {
	property = p;
	hostsSource = s;
	this.pattern = pattern;
	defaultVal = d;
	}
	}


	/**
	* select() method. Where all the hard work is done.
	* Build a list of proxies depending on URI.
	* Since we're only providing compatibility with the system properties
	* from previous releases (see list above), that list will typically
	* contain one single proxy, default being NO_PROXY.
	* If we can get a system proxy it might contain more entries.
	*/
	public java.util.List<Proxy> select(URI uri) {
	if (uri == null) {
	throw new IllegalArgumentException("URI can't be null.");
	}
	String protocol = uri.getScheme();
	String host = uri.getHost();

	if (host == null) {
	// This is a hack to ensure backward compatibility in two
	// cases: 1. hostnames contain non-ascii characters,
	// internationalized domain names. in which case, URI will
	// return null, see BugID 4957669; 2. Some hostnames can
	// contain '_' chars even though it's not supposed to be
	// legal, in which case URI will return null for getHost,
	// but not for getAuthority() See BugID 4913253
	String auth = uri.getAuthority();
	if (auth != null) {
	int i;
	i = auth.indexOf('@');
	if (i >= 0) {
	auth = auth.substring(i+1);
	}
	i = auth.lastIndexOf(':');
	if (i >= 0) {
	auth = auth.substring(0,i);
	}
	host = auth;
	}
	}

	if (protocol == null \|\| host == null) {
	throw new IllegalArgumentException("protocol = "+protocol+" host = "+host);
	}

	NonProxyInfo pinfo = null;

	if ("http".equalsIgnoreCase(protocol)) {
	pinfo = NonProxyInfo.httpNonProxyInfo;
	} else if ("https".equalsIgnoreCase(protocol)) {
	// HTTPS uses the same property as HTTP, for backward
	// compatibility
	pinfo = NonProxyInfo.httpNonProxyInfo;
	} else if ("ftp".equalsIgnoreCase(protocol)) {
	pinfo = NonProxyInfo.ftpNonProxyInfo;
	} else if ("socket".equalsIgnoreCase(protocol)) {
	pinfo = NonProxyInfo.socksNonProxyInfo;
	}

	/**
	* Let's check the System properties for that protocol
	*/
	final String proto = protocol;
	final NonProxyInfo nprop = pinfo;
	final String urlhost = host.toLowerCase();

	/**
	* This is one big doPrivileged call, but we're trying to optimize
	* the code as much as possible. Since we're checking quite a few
	* System properties it does help having only 1 call to doPrivileged.
	* Be mindful what you do in here though!
	*/
	Proxy[] proxyArray = AccessController.doPrivileged(
	new PrivilegedAction<Proxy[]>() {
	public Proxy[] run() {
	int i, j;
	String phost = null;
	int pport = 0;
	String nphosts = null;
	InetSocketAddress saddr = null;

	// Then let's walk the list of protocols in our array
	for (i=0; i<props.length; i++) {
	if (props[i][0].equalsIgnoreCase(proto)) {
	for (j = 1; j < props[i].length; j++) {
	/* System.getProp() will give us an empty
	* String, "" for a defined but "empty"
	* property.
	*/
	phost = NetProperties.get(props[i][j]+"Host");
	if (phost != null && phost.length() != 0)
	break;
	}
	if (phost == null \|\| phost.length() == 0) {
	/**
	* No system property defined for that
	* protocol. Let's check System Proxy
	* settings (Gnome, MacOsX & Windows) if
	* we were instructed to.
	*/
	if (hasSystemProxies) {
	String sproto;
	if (proto.equalsIgnoreCase("socket"))
	sproto = "socks";
	else
	sproto = proto;
	return getSystemProxies(sproto, urlhost);
	}
	return null;
	}
	// If a Proxy Host is defined for that protocol
	// Let's get the NonProxyHosts property
	if (nprop != null) {
	nphosts = NetProperties.get(nprop.property);
	synchronized (nprop) {
	if (nphosts == null) {
	if (nprop.defaultVal != null) {
	nphosts = nprop.defaultVal;
	} else {
	nprop.hostsSource = null;
	nprop.pattern = null;
	}
	} else if (nphosts.length() != 0) {
	// add the required default patterns
	// but only if property no set. If it
	// is empty, leave empty.
	nphosts += "\|" + NonProxyInfo
	.defStringVal;
	}
	if (nphosts != null) {
	if (!nphosts.equals(nprop.hostsSource)) {
	nprop.pattern = toPattern(nphosts);
	nprop.hostsSource = nphosts;
	}
	}
	if (shouldNotUseProxyFor(nprop.pattern, urlhost)) {
	return null;
	}
	}
	}
	// We got a host, let's check for port

	pport = NetProperties.getInteger(props[i][j]+"Port", 0).intValue();
	if (pport == 0 && j < (props[i].length - 1)) {
	// Can't find a port with same prefix as Host
	// AND it's not a SOCKS proxy
	// Let's try the other prefixes for that proto
	for (int k = 1; k < (props[i].length - 1); k++) {
	if ((k != j) && (pport == 0))
	pport = NetProperties.getInteger(props[i][k]+"Port", 0).intValue();
	}
	}

	// Still couldn't find a port, let's use default
	if (pport == 0) {
	if (j == (props[i].length - 1)) // SOCKS
	pport = defaultPort("socket");
	else
	pport = defaultPort(proto);
	}
	// We did find a proxy definition.
	// Let's create the address, but don't resolve it
	// as this will be done at connection time
	saddr = InetSocketAddress.createUnresolved(phost, pport);
	// Socks is always the last on the list.
	if (j == (props[i].length - 1)) {
	return new Proxy[] {SocksProxy.create(saddr, socksProxyVersion())};
	}
	return new Proxy[] {new Proxy(Proxy.Type.HTTP, saddr)};
	}
	}
	return null;
	}});


	if (proxyArray != null) {
	// Remove duplicate entries, while preserving order.
	return Stream.of(proxyArray).distinct().collect(
	collectingAndThen(toList(), Collections::unmodifiableList));
	}

	// If no specific proxy was found, return a standard list containing
	// only one NO_PROXY entry.
	return NO_PROXY_LIST;
	}

	public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
	if (uri == null \|\| sa == null \|\| ioe == null) {
	throw new IllegalArgumentException("Arguments can't be null.");
	}
	// ignored
	}


	private int defaultPort(String protocol) {
	if ("http".equalsIgnoreCase(protocol)) {
	return 80;
	} else if ("https".equalsIgnoreCase(protocol)) {
	return 443;
	} else if ("ftp".equalsIgnoreCase(protocol)) {
	return 80;
	} else if ("socket".equalsIgnoreCase(protocol)) {
	return 1080;
	} else if ("gopher".equalsIgnoreCase(protocol)) {
	return 80;
	} else {
	return -1;
	}
	}

	private static native boolean init();
	private synchronized native Proxy[] getSystemProxies(String protocol, String host);

	/**
	* @return {@code true} if given this pattern for non-proxy hosts and this
	* urlhost the proxy should NOT be used to access this urlhost
	*/
	static boolean shouldNotUseProxyFor(Pattern pattern, String urlhost) {
	if (pattern == null \|\| urlhost.isEmpty())
	return false;
	boolean matches = pattern.matcher(urlhost).matches();
	return matches;
	}

	/**
	* @param mask non-null mask
	* @return {@link java.util.regex.Pattern} corresponding to this mask
	* or {@code null} in case mask should not match anything
	*/
	static Pattern toPattern(String mask) {
	boolean disjunctionEmpty = true;
	StringJoiner joiner = new StringJoiner("\|");
	for (String disjunct : mask.split("\\\|")) {
	if (disjunct.isEmpty())
	continue;
	disjunctionEmpty = false;
	String regex = disjunctToRegex(disjunct.toLowerCase());
	joiner.add(regex);
	}
	return disjunctionEmpty ? null : Pattern.compile(joiner.toString());
	}

	/**
	* @param disjunct non-null mask disjunct
	* @return java regex string corresponding to this mask
	*/
	static String disjunctToRegex(String disjunct) {
	String regex;
	if (disjunct.startsWith("") && disjunct.endsWith("")) {
	regex = "." + quote(disjunct.substring(1, disjunct.length() - 1)) + ".";
	} else if (disjunct.startsWith("*")) {
	regex = ".*" + quote(disjunct.substring(1));
	} else if (disjunct.endsWith("*")) {
	regex = quote(disjunct.substring(0, disjunct.length() - 1)) + ".*";
	} else {
	regex = quote(disjunct);
	}
	return regex;
	}
	}

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