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An HTTP library for Java that provides a lightweight server (currently) and client (eventually) both with a goal of high-performance and simplicity

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/*
 * Copyright (c) 2015-2022, FusionAuth, All Rights Reserved
 *
 * 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.fusionauth.http.util;

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.SignStyle;
import java.util.HashMap;
import java.util.Map;

import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.DAY_OF_WEEK;
import static java.time.temporal.ChronoField.HOUR_OF_DAY;
import static java.time.temporal.ChronoField.MINUTE_OF_HOUR;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.SECOND_OF_MINUTE;
import static java.time.temporal.ChronoField.YEAR;

/**
 * Tools for dates, all dates are parsed and formatted using an RFC 5322 compatible format.
 * 
 * https://datatracker.ietf.org/doc/html/rfc5322
 *
 * @author Brian Pontarelli
 */
public final class DateTools {
  public static final DateTimeFormatter RFC_5322_DATE_TIME;

  private DateTools() {
  }

  public static String format(ZonedDateTime value) {
    return value.format(DateTools.RFC_5322_DATE_TIME);
  }

  public static ZonedDateTime parse(String value) {
    try {
      return ZonedDateTime.parse(value, DateTools.RFC_5322_DATE_TIME);
    } catch (Exception e) {
      return null;
    }
  }

  static {
    Map dow = new HashMap<>();
    dow.put(1L, "Mon");
    dow.put(2L, "Tue");
    dow.put(3L, "Wed");
    dow.put(4L, "Thu");
    dow.put(5L, "Fri");
    dow.put(6L, "Sat");
    dow.put(7L, "Sun");
    Map moy = new HashMap<>();
    moy.put(1L, "Jan");
    moy.put(2L, "Feb");
    moy.put(3L, "Mar");
    moy.put(4L, "Apr");
    moy.put(5L, "May");
    moy.put(6L, "Jun");
    moy.put(7L, "Jul");
    moy.put(8L, "Aug");
    moy.put(9L, "Sep");
    moy.put(10L, "Oct");
    moy.put(11L, "Nov");
    moy.put(12L, "Dec");

    RFC_5322_DATE_TIME = new DateTimeFormatterBuilder()
        .parseCaseInsensitive()
        .parseLenient()
        .optionalStart()
        .appendText(DAY_OF_WEEK, dow)
        .appendLiteral(", ")
        .optionalEnd()
        .appendValue(DAY_OF_MONTH, 2, 2, SignStyle.NOT_NEGATIVE)
        .appendLiteral(' ')
        .appendText(MONTH_OF_YEAR, moy)
        .appendLiteral(' ')
        .appendValue(YEAR, 4)  // 2 digit year not handled
        .appendLiteral(' ')
        .appendValue(HOUR_OF_DAY, 2)
        .appendLiteral(':')
        .appendValue(MINUTE_OF_HOUR, 2)
        .optionalStart()
        .appendLiteral(':')
        .appendValue(SECOND_OF_MINUTE, 2)
        .optionalEnd()
        .appendLiteral(' ')
        .appendOffset("+HHMM", "GMT")  // should handle UT/Z/EST/EDT/CST/CDT/MST/MDT/PST/MDT
        .toFormatter();
  }
}