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/*
* Copyright Stalwart Labs Ltd. See the COPYING
* file at the top-level directory of this distribution.
*
* Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
* option. This file may not be copied, modified, or distributed
* except according to those terms.
*/
use std::{
io::{self, Write},
time::SystemTime,
};
pub static DOW: &[&str] = &["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
pub static MONTH: &[&str] = &[
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
];
use super::Header;
/// RFC5322 Date header
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct Date {
pub date: i64,
}
impl Date {
/// Create a new Date header from a timestamp.
pub fn new(date: i64) -> Self {
Self { date }
}
/// Create a new Date header using the current time.
pub fn now() -> Self {
Self {
date: SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.map(|d| d.as_secs())
.unwrap_or(0) as i64,
}
}
/// Returns an RFC822 date.
pub fn to_rfc822(&self) -> String {
let (z, seconds) = ((self.date / 86400) + 719468, self.date % 86400);
let era: i64 = (if z >= 0 { z } else { z - 146096 }) / 146097;
let doe: u64 = (z - era * 146097) as u64; // [0, 146096]
let yoe: u64 = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; // [0, 399]
let y: i64 = (yoe as i64) + era * 400;
let doy: u64 = doe - (365 * yoe + yoe / 4 - yoe / 100); // [0, 365]
let mp = (5 * doy + 2) / 153; // [0, 11]
let d: u64 = doy - (153 * mp + 2) / 5 + 1; // [1, 31]
let m: u64 = if mp < 10 { mp + 3 } else { mp - 9 }; // [1, 12]
let (h, mn, s) = (seconds / 3600, (seconds / 60) % 60, seconds % 60);
format!(
"{}, {} {} {:04} {:02}:{:02}:{:02} +0000", //{}{:02}{:02}",
DOW[(((self.date as f64 / 86400.0).floor() as i64 + 4).rem_euclid(7)) as usize],
d,
MONTH.get(m.saturating_sub(1) as usize).unwrap_or(&""),
(y + i64::from(m <= 2)),
h,
mn,
s,
/*if self.tz_before_gmt && (self.tz_hour > 0 || self.tz_minute > 0) {
"-"
} else {
"+"
},
self.tz_hour,
self.tz_minute*/
)
}
}
impl From<i64> for Date {
fn from(datetime: i64) -> Self {
Date::new(datetime)
}
}
impl From<u64> for Date {
fn from(datetime: u64) -> Self {
Date::new(datetime as i64)
}
}
impl Header for Date {
fn write_header(&self, mut output: impl Write, _bytes_written: usize) -> io::Result<usize> {
output.write_all(self.to_rfc822().as_bytes())?;
output.write_all(b"\r\n")?;
Ok(0)
}
}