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	/*
	* Copyright (c) 1994, 2021, 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.www;
	import jdk.internal.util.StaticProperty;

	import java.io.*;
	import java.net.FileNameMap;
	import java.util.Hashtable;
	import java.util.Enumeration;
	import java.util.Properties;
	import java.util.StringTokenizer;

	@SuppressWarnings("removal")
	public class MimeTable implements FileNameMap {
	/** Keyed by content type, returns MimeEntries */
	private Hashtable<String, MimeEntry> entries
	= new Hashtable<String, MimeEntry>();

	/** Keyed by file extension (with the .), returns MimeEntries */
	private Hashtable<String, MimeEntry> extensionMap
	= new Hashtable<String, MimeEntry>();

	// Will be reset if in the platform-specific data file
	private static String tempFileTemplate;

	static {
	java.security.AccessController.doPrivileged(
	new java.security.PrivilegedAction<Void>() {
	public Void run() {
	tempFileTemplate =
	System.getProperty("content.types.temp.file.template",
	"/tmp/%s");

	mailcapLocations = new String[] {
	System.getProperty("user.mailcap"),
	StaticProperty.userHome() + "/.mailcap",
	"/etc/mailcap",
	"/usr/etc/mailcap",
	"/usr/local/etc/mailcap",
	};
	return null;
	}
	});
	}


	private static final String filePreamble = "sun.net.www MIME content-types table";
	private static final String fileMagic = "#" + filePreamble;

	MimeTable() {
	load();
	}

	private static class DefaultInstanceHolder {
	static final MimeTable defaultInstance = getDefaultInstance();

	static MimeTable getDefaultInstance() {
	return java.security.AccessController.doPrivileged(
	new java.security.PrivilegedAction<MimeTable>() {
	public MimeTable run() {
	MimeTable instance = new MimeTable();
	URLConnection.setFileNameMap(instance);
	return instance;
	}
	});
	}
	}

	/**
	* Get the single instance of this class. First use will load the
	* table from a data file.
	*/
	public static MimeTable getDefaultTable() {
	return DefaultInstanceHolder.defaultInstance;
	}

	/**
	*
	*/
	public static FileNameMap loadTable() {
	MimeTable mt = getDefaultTable();
	return (FileNameMap)mt;
	}

	public synchronized int getSize() {
	return entries.size();
	}

	public synchronized String getContentTypeFor(String fileName) {
	MimeEntry entry = findByFileName(fileName);
	if (entry != null) {
	return entry.getType();
	} else {
	return null;
	}
	}

	public synchronized void add(MimeEntry m) {
	entries.put(m.getType(), m);

	String exts[] = m.getExtensions();
	if (exts == null) {
	return;
	}

	for (int i = 0; i < exts.length; i++) {
	extensionMap.put(exts[i], m);
	}
	}

	public synchronized MimeEntry remove(String type) {
	MimeEntry entry = entries.get(type);
	return remove(entry);
	}

	public synchronized MimeEntry remove(MimeEntry entry) {
	String[] extensionKeys = entry.getExtensions();
	if (extensionKeys != null) {
	for (int i = 0; i < extensionKeys.length; i++) {
	extensionMap.remove(extensionKeys[i]);
	}
	}

	return entries.remove(entry.getType());
	}

	public synchronized MimeEntry find(String type) {
	MimeEntry entry = entries.get(type);
	if (entry == null) {
	// try a wildcard lookup
	Enumeration<MimeEntry> e = entries.elements();
	while (e.hasMoreElements()) {
	MimeEntry wild = e.nextElement();
	if (wild.matches(type)) {
	return wild;
	}
	}
	}

	return entry;
	}

	/**
	* Locate a MimeEntry by the file extension that has been associated
	* with it. Parses general file names, and URLs.
	*/
	public MimeEntry findByFileName(String fname) {
	String ext = "";

	int i = fname.lastIndexOf('#');

	if (i > 0) {
	fname = fname.substring(0, i - 1);
	}

	i = fname.lastIndexOf('.');
	// REMIND: OS specific delimters appear here
	i = Math.max(i, fname.lastIndexOf('/'));
	i = Math.max(i, fname.lastIndexOf('?'));

	if (i != -1 && fname.charAt(i) == '.') {
	ext = fname.substring(i).toLowerCase();
	}

	return findByExt(ext);
	}

	/**
	* Locate a MimeEntry by the file extension that has been associated
	* with it.
	*/
	public synchronized MimeEntry findByExt(String fileExtension) {
	return extensionMap.get(fileExtension);
	}

	public synchronized MimeEntry findByDescription(String description) {
	Enumeration<MimeEntry> e = elements();
	while (e.hasMoreElements()) {
	MimeEntry entry = e.nextElement();
	if (description.equals(entry.getDescription())) {
	return entry;
	}
	}

	// We failed, now try treating description as type
	return find(description);
	}

	String getTempFileTemplate() {
	return tempFileTemplate;
	}

	public synchronized Enumeration<MimeEntry> elements() {
	return entries.elements();
	}

	// For backward compatibility -- mailcap format files
	// This is not currently used, but may in the future when we add ability
	// to read BOTH the properties format and the mailcap format.
	protected static String[] mailcapLocations;

	public synchronized void load() {
	Properties entries = new Properties();
	File file = null;
	InputStream in;

	// First try to load the user-specific table, if it exists
	String userTablePath = System.getProperty("content.types.user.table");
	if (userTablePath != null && (file = new File(userTablePath)).exists()) {
	try {
	in = new FileInputStream(file);
	} catch (FileNotFoundException e) {
	System.err.println("Warning: " + file.getPath()
	+ " mime table not found.");
	return;
	}
	} else {
	in = MimeTable.class.getResourceAsStream("content-types.properties");
	if (in == null)
	throw new InternalError("default mime table not found");
	}

	try (BufferedInputStream bin = new BufferedInputStream(in)) {
	entries.load(bin);
	} catch (IOException e) {
	System.err.println("Warning: " + e.getMessage());
	}
	parse(entries);
	}

	void parse(Properties entries) {
	// first, strip out the platform-specific temp file template
	String tempFileTemplate = (String)entries.get("temp.file.template");
	if (tempFileTemplate != null) {
	entries.remove("temp.file.template");
	MimeTable.tempFileTemplate = tempFileTemplate;
	}

	// now, parse the mime-type spec's
	Enumeration<?> types = entries.propertyNames();
	while (types.hasMoreElements()) {
	String type = (String)types.nextElement();
	String attrs = entries.getProperty(type);
	parse(type, attrs);
	}
	}

	//
	// Table format:
	//
	// <entry> ::= <table_tag> \| <type_entry>
	//
	// <table_tag> ::= <table_format_version> \| <temp_file_template>
	//
	// <type_entry> ::= <type_subtype_pair> '=' <type_attrs_list>
	//
	// <type_subtype_pair> ::= <type> '/' <subtype>
	//
	// <type_attrs_list> ::= <attr_value_pair> [ ';' <attr_value_pair> ]*
	// \| [ <attr_value_pair> ]+
	//
	// <attr_value_pair> ::= <attr_name> '=' <attr_value>
	//
	// <attr_name> ::= 'description' \| 'action' \| 'application'
	// \| 'file_extensions' \| 'icon'
	//
	// <attr_value> ::= <legal_char>*
	//
	// Embedded ';' in an <attr_value> are quoted with leading '\' .
	//
	// Interpretation of <attr_value> depends on the <attr_name> it is
	// associated with.
	//

	void parse(String type, String attrs) {
	MimeEntry newEntry = new MimeEntry(type);

	// REMIND handle embedded ';' and '\|' and literal '"'
	StringTokenizer tokenizer = new StringTokenizer(attrs, ";");
	while (tokenizer.hasMoreTokens()) {
	String pair = tokenizer.nextToken();
	parse(pair, newEntry);
	}

	add(newEntry);
	}

	void parse(String pair, MimeEntry entry) {
	// REMIND add exception handling...
	String name = null;
	String value = null;

	boolean gotName = false;
	StringTokenizer tokenizer = new StringTokenizer(pair, "=");
	while (tokenizer.hasMoreTokens()) {
	if (gotName) {
	value = tokenizer.nextToken().trim();
	}
	else {
	name = tokenizer.nextToken().trim();
	gotName = true;
	}
	}

	fill(entry, name, value);
	}

	void fill(MimeEntry entry, String name, String value) {
	if ("description".equalsIgnoreCase(name)) {
	entry.setDescription(value);
	}
	else if ("action".equalsIgnoreCase(name)) {
	entry.setAction(getActionCode(value));
	}
	else if ("application".equalsIgnoreCase(name)) {
	entry.setCommand(value);
	}
	else if ("icon".equalsIgnoreCase(name)) {
	entry.setImageFileName(value);
	}
	else if ("file_extensions".equalsIgnoreCase(name)) {
	entry.setExtensions(value);
	}

	// else illegal name exception
	}

	String[] getExtensions(String list) {
	StringTokenizer tokenizer = new StringTokenizer(list, ",");
	int n = tokenizer.countTokens();
	String[] extensions = new String[n];
	for (int i = 0; i < n; i++) {
	extensions[i] = tokenizer.nextToken();
	}

	return extensions;
	}

	int getActionCode(String action) {
	for (int i = 0; i < MimeEntry.actionKeywords.length; i++) {
	if (action.equalsIgnoreCase(MimeEntry.actionKeywords[i])) {
	return i;
	}
	}

	return MimeEntry.UNKNOWN;
	}

	public Properties getAsProperties() {
	Properties properties = new Properties();
	Enumeration<MimeEntry> e = elements();
	while (e.hasMoreElements()) {
	MimeEntry entry = e.nextElement();
	properties.put(entry.getType(), entry.toProperty());
	}

	return properties;
	}

	protected boolean saveAsProperties(File file) {
	FileOutputStream os = null;
	try {
	os = new FileOutputStream(file);
	Properties properties = getAsProperties();
	properties.put("temp.file.template", tempFileTemplate);
	String tag;
	// Perform the property security check for user.name
	SecurityManager sm = System.getSecurityManager();
	if (sm != null) {
	sm.checkPropertyAccess("user.name");
	}
	String user = StaticProperty.userName();
	if (user != null) {
	tag = "; customized for " + user;
	properties.store(os, filePreamble + tag);
	}
	else {
	properties.store(os, filePreamble);
	}
	}
	catch (IOException e) {
	e.printStackTrace();
	return false;
	}
	finally {
	if (os != null) {
	try { os.close(); } catch (IOException e) {}
	}
	}

	return true;
	}
	/*
	* Debugging utilities
	*
	public void list(PrintStream out) {
	Enumeration keys = entries.keys();
	while (keys.hasMoreElements()) {
	String key = (String)keys.nextElement();
	MimeEntry entry = (MimeEntry)entries.get(key);
	out.println(key + ": " + entry);
	}
	}

	public static void main(String[] args) {
	MimeTable testTable = MimeTable.getDefaultTable();

	Enumeration e = testTable.elements();
	while (e.hasMoreElements()) {
	MimeEntry entry = (MimeEntry)e.nextElement();
	System.out.println(entry);
	}

	testTable.save(File.separator + "tmp" +
	File.separator + "mime_table.save");
	}
	*/
	}

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