DateUtils.java
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.
*/
package io.undertow.util;
import io.undertow.UndertowOptions;
import io.undertow.server.HttpServerExchange;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
/**
* Utility for parsing and generating dates
*
* @author Stuart Douglas
*/
public class DateUtils {
private static final Locale LOCALE_US = Locale.US;
private static final TimeZone GMT_ZONE = TimeZone.getTimeZone("GMT");
private static final String RFC1123_PATTERN = "EEE, dd MMM yyyy HH:mm:ss z";
private static final AtomicReference<String> cachedDateString = new AtomicReference<>();
/**
* Thread local cache of this date format. This is technically a small memory leak, however
* in practice it is fine, as it will only be used by server threads.
* <p>
* This is the most common date format, which is why we cache it.
*/
private static final ThreadLocal<SimpleDateFormat> RFC1123_PATTERN_FORMAT = new ThreadLocal<SimpleDateFormat>() {
@Override
protected SimpleDateFormat initialValue() {
SimpleDateFormat df = new SimpleDateFormat(RFC1123_PATTERN, LOCALE_US);
return df;
}
};
/**
* Invalidates the current date
*/
private static final Runnable INVALIDATE_TASK = new Runnable() {
@Override
public void run() {
cachedDateString.set(null);
}
};
private static final String RFC1036_PATTERN = "EEEEEEEEE, dd-MMM-yy HH:mm:ss z";
private static final String ASCITIME_PATTERN = "EEE MMM d HH:mm:ss yyyyy";
private static final String OLD_COOKIE_PATTERN = "EEE, dd-MMM-yyyy HH:mm:ss z";
private static final String COMMON_LOG_PATTERN = "[dd/MMM/yyyy:HH:mm:ss Z]";
private static final ThreadLocal<SimpleDateFormat> COMMON_LOG_PATTERN_FORMAT = new ThreadLocal<SimpleDateFormat>() {
@Override
protected SimpleDateFormat initialValue() {
SimpleDateFormat df = new SimpleDateFormat(COMMON_LOG_PATTERN, LOCALE_US);
return df;
}
};
private static final ThreadLocal<SimpleDateFormat> OLD_COOKIE_FORMAT = new ThreadLocal<SimpleDateFormat>() {
@Override
protected SimpleDateFormat initialValue() {
SimpleDateFormat df = new SimpleDateFormat(OLD_COOKIE_PATTERN, LOCALE_US);
df.setTimeZone(GMT_ZONE);
return df;
}
};
/**
* Converts a date to a format suitable for use in a HTTP request
*
* @param date The date
* @return The RFC-1123 formatted date
*/
public static String toDateString(final Date date) {
SimpleDateFormat df = RFC1123_PATTERN_FORMAT.get();
//we always need to set the time zone
//because date format is stupid, and calling parse() can mutate the timezone
//see UNDERTOW-458
df.setTimeZone(GMT_ZONE);
return df.format(date);
}
public static String toOldCookieDateString(final Date date) {
return OLD_COOKIE_FORMAT.get().format(date);
}
public static String toCommonLogFormat(final Date date) {
return COMMON_LOG_PATTERN_FORMAT.get().format(date);
}
/**
* Attempts to pass a HTTP date.
*
* @param date The date to parse
* @return The parsed date, or null if parsing failed
*/
public static Date parseDate(final String date) {
/*
IE9 sends a superflous lenght parameter after date in the
If-Modified-Since header, which needs to be stripped before
parsing.
*/
final int semicolonIndex = date.indexOf(';');
final String trimmedDate = semicolonIndex >= 0 ? date.substring(0, semicolonIndex) : date;
ParsePosition pp = new ParsePosition(0);
SimpleDateFormat dateFormat = RFC1123_PATTERN_FORMAT.get();
dateFormat.setTimeZone(GMT_ZONE);
Date val = dateFormat.parse(trimmedDate, pp);
if (val != null && pp.getIndex() == trimmedDate.length()) {
return val;
}
pp = new ParsePosition(0);
dateFormat = new SimpleDateFormat(RFC1036_PATTERN, LOCALE_US);
dateFormat.setTimeZone(GMT_ZONE);
val = dateFormat.parse(trimmedDate, pp);
if (val != null && pp.getIndex() == trimmedDate.length()) {
return val;
}
pp = new ParsePosition(0);
dateFormat = new SimpleDateFormat(ASCITIME_PATTERN, LOCALE_US);
dateFormat.setTimeZone(GMT_ZONE);
val = dateFormat.parse(trimmedDate, pp);
if (val != null && pp.getIndex() == trimmedDate.length()) {
return val;
}
pp = new ParsePosition(0);
dateFormat = new SimpleDateFormat(OLD_COOKIE_PATTERN, LOCALE_US);
dateFormat.setTimeZone(GMT_ZONE);
val = dateFormat.parse(trimmedDate, pp);
if (val != null && pp.getIndex() == trimmedDate.length()) {
return val;
}
return null;
}
/**
* Handles the if-modified-since header. returns true if the request should proceed, false otherwise
*
* @param exchange the exchange
* @param lastModified The last modified date
* @return
*/
public static boolean handleIfModifiedSince(final HttpServerExchange exchange, final Date lastModified) {
return handleIfModifiedSince(exchange.getRequestHeaders().getFirst(Headers.IF_MODIFIED_SINCE), lastModified);
}
/**
* Handles the if-modified-since header. returns true if the request should proceed, false otherwise
*
* @param modifiedSince the modified since date
* @param lastModified The last modified date
* @return
*/
public static boolean handleIfModifiedSince(final String modifiedSince, final Date lastModified) {
if (lastModified == null) {
return true;
}
if (modifiedSince == null) {
return true;
}
Date modDate = parseDate(modifiedSince);
if (modDate == null) {
return true;
}
return lastModified.getTime() > (modDate.getTime() + 999); //UNDERTOW-341 +999 as there is no millisecond part in the if-modified-since
}
/**
* Handles the if-unmodified-since header. returns true if the request should proceed, false otherwise
*
* @param exchange the exchange
* @param lastModified The last modified date
* @return
*/
public static boolean handleIfUnmodifiedSince(final HttpServerExchange exchange, final Date lastModified) {
return handleIfUnmodifiedSince(exchange.getRequestHeaders().getFirst(Headers.IF_UNMODIFIED_SINCE), lastModified);
}
/**
* Handles the if-unmodified-since header. returns true if the request should proceed, false otherwise
*
* @param modifiedSince the if unmodified since date
* @param lastModified The last modified date
* @return
*/
public static boolean handleIfUnmodifiedSince(final String modifiedSince, final Date lastModified) {
if (lastModified == null) {
return true;
}
if (modifiedSince == null) {
return true;
}
Date modDate = parseDate(modifiedSince);
if (modDate == null) {
return true;
}
return lastModified.getTime() < (modDate.getTime() + 999); //UNDERTOW-341 +999 as there is no millisecond part in the if-unmodified-since
}
public static void addDateHeaderIfRequired(HttpServerExchange exchange) {
HeaderMap responseHeaders = exchange.getResponseHeaders();
if (exchange.getConnection().getUndertowOptions().get(UndertowOptions.ALWAYS_SET_DATE, true) && !responseHeaders.contains(Headers.DATE)) {
String dateString = getCurrentDateTime(exchange);
responseHeaders.put(Headers.DATE, dateString);
}
}
public static String getCurrentDateTime(HttpServerExchange exchange) {
String dateString = cachedDateString.get();
if (dateString == null) {
//set the time and register a timer to invalidate it
//note that this is racey, it does not matter if multiple threads do this
//the perf cost of synchronizing would be more than the perf cost of multiple threads running it
long realTime = System.currentTimeMillis();
long mod = realTime % 1000;
long toGo = 1000 - mod;
dateString = DateUtils.toDateString(new Date(realTime));
if (cachedDateString.compareAndSet(null, dateString)) {
WorkerUtils.executeAfter(exchange.getIoThread(), INVALIDATE_TASK, toGo, TimeUnit.MILLISECONDS);
}
}
return dateString;
}
private DateUtils() {
}
}