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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.http;
import java.time.Instant;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.thread.ThreadIdPool;
/**
* ThreadLocal Date formatters for HTTP style dates.
*/
public class DateGenerator
{
private static final TimeZone __GMT = TimeZone.getTimeZone("GMT");
static
{
__GMT.setID("GMT");
}
static final String[] DAYS =
{"Sat", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
static final String[] MONTHS =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", "Jan"};
private static final ThreadIdPool __dateGenerator = new ThreadIdPool<>();
public static final String __01Jan1970 = DateGenerator.formatDate(0);
/**
* Format HTTP date "EEE, dd MMM yyyy HH:mm:ss 'GMT'"
*
* @param date the date in milliseconds
* @return the formatted date
*/
public static String formatDate(long date)
{
return __dateGenerator.apply(DateGenerator::new, DateGenerator::doFormatDate, date);
}
/**
* Format HTTP date "EEE, dd MMM yyyy HH:mm:ss 'GMT'"
*
* @param instant the date/time instant
* @return the formatted date
*/
public static String formatDate(Instant instant)
{
return formatDate(instant.toEpochMilli());
}
private final StringBuilder buf = new StringBuilder(32);
private final GregorianCalendar gc = new GregorianCalendar(__GMT);
/**
* Format HTTP date "EEE, dd MMM yyyy HH:mm:ss 'GMT'"
*
* @param date the date in milliseconds
* @return the formatted date
*/
public String doFormatDate(long date)
{
buf.setLength(0);
gc.setTimeInMillis(date);
final int dayOfWeek = gc.get(Calendar.DAY_OF_WEEK);
final int dayOfMonth = gc.get(Calendar.DAY_OF_MONTH);
final int month = gc.get(Calendar.MONTH);
final int fullYear = gc.get(Calendar.YEAR);
final int century = fullYear / 100;
final int year = fullYear % 100;
final int hours = gc.get(Calendar.HOUR_OF_DAY);
final int minutes = gc.get(Calendar.MINUTE);
final int seconds = gc.get(Calendar.SECOND);
buf.append(DAYS[dayOfWeek]);
buf.append(',');
buf.append(' ');
StringUtil.append2digits(buf, dayOfMonth);
buf.append(' ');
buf.append(MONTHS[month]);
buf.append(' ');
StringUtil.append2digits(buf, century);
StringUtil.append2digits(buf, year);
buf.append(' ');
StringUtil.append2digits(buf, hours);
buf.append(':');
StringUtil.append2digits(buf, minutes);
buf.append(':');
StringUtil.append2digits(buf, seconds);
buf.append(" GMT");
return buf.toString();
}
/**
* Format "EEE, dd-MMM-yy HH:mm:ss 'GMT'" for cookies
*
* @param buf the buffer to format the date into
* @param date the date in milliseconds
*/
public void doFormatCookieDate(StringBuilder buf, long date)
{
gc.setTimeInMillis(date);
final int dayOfWeek = gc.get(Calendar.DAY_OF_WEEK);
final int dayOfMonth = gc.get(Calendar.DAY_OF_MONTH);
final int month = gc.get(Calendar.MONTH);
final int fullYear = gc.get(Calendar.YEAR);
final int year = fullYear % 10000;
final int epochSec = (int)((date / 1000) % (60 * 60 * 24));
final int seconds = epochSec % 60;
final int epoch = epochSec / 60;
final int minutes = epoch % 60;
final int hours = epoch / 60;
buf.append(DAYS[dayOfWeek]);
buf.append(',');
buf.append(' ');
StringUtil.append2digits(buf, dayOfMonth);
buf.append('-');
buf.append(MONTHS[month]);
buf.append('-');
StringUtil.append2digits(buf, year / 100);
StringUtil.append2digits(buf, year % 100);
buf.append(' ');
StringUtil.append2digits(buf, hours);
buf.append(':');
StringUtil.append2digits(buf, minutes);
buf.append(':');
StringUtil.append2digits(buf, seconds);
buf.append(" GMT");
}
}
