mail_builder/headers/
date.rs

1/*
2 * Copyright Stalwart Labs Ltd. See the COPYING
3 * file at the top-level directory of this distribution.
4 *
5 * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
8 * option. This file may not be copied, modified, or distributed
9 * except according to those terms.
10 */
11
12use std::{
13    io::{self, Write},
14    time::SystemTime,
15};
16
17pub static DOW: &[&str] = &["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
18pub static MONTH: &[&str] = &[
19    "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
20];
21
22use super::Header;
23
24/// RFC5322 Date header
25#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
26pub struct Date {
27    pub date: i64,
28}
29
30impl Date {
31    /// Create a new Date header from a timestamp.
32    pub fn new(date: i64) -> Self {
33        Self {
34            date,
35        }
36    }
37
38    /// Create a new Date header using the current time.
39    pub fn now() -> Self {
40        Self {
41            date: SystemTime::now()
42                .duration_since(SystemTime::UNIX_EPOCH)
43                .map(|d| d.as_secs())
44                .unwrap_or(0) as i64,
45        }
46    }
47
48    /// Returns an RFC822 date.
49    pub fn to_rfc822(&self) -> String {
50        // Ported from http://howardhinnant.github.io/date_algorithms.html#civil_from_days
51        let (z, seconds) = ((self.date / 86400) + 719468, self.date % 86400);
52        let era: i64 = (if z >= 0 { z } else { z - 146096 }) / 146097;
53        let doe: u64 = (z - era * 146097) as u64; // [0, 146096]
54        let yoe: u64 = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; // [0, 399]
55        let y: i64 = (yoe as i64) + era * 400;
56        let doy: u64 = doe - (365 * yoe + yoe / 4 - yoe / 100); // [0, 365]
57        let mp = (5 * doy + 2) / 153; // [0, 11]
58        let d: u64 = doy - (153 * mp + 2) / 5 + 1; // [1, 31]
59        let m: u64 = if mp < 10 { mp + 3 } else { mp - 9 }; // [1, 12]
60        let (h, mn, s) = (seconds / 3600, (seconds / 60) % 60, seconds % 60);
61
62        format!(
63            "{}, {} {} {:04} {:02}:{:02}:{:02} +0000", //{}{:02}{:02}",
64            DOW[(((self.date as f64 / 86400.0).floor() as i64 + 4).rem_euclid(7)) as usize],
65            d,
66            MONTH.get(m.saturating_sub(1) as usize).unwrap_or(&""),
67            (y + i64::from(m <= 2)),
68            h,
69            mn,
70            s,
71            /*if self.tz_before_gmt && (self.tz_hour > 0 || self.tz_minute > 0) {
72                "-"
73            } else {
74                "+"
75            },
76            self.tz_hour,
77            self.tz_minute*/
78        )
79    }
80}
81
82impl From<i64> for Date {
83    fn from(datetime: i64) -> Self {
84        Date::new(datetime)
85    }
86}
87
88impl From<u64> for Date {
89    fn from(datetime: u64) -> Self {
90        Date::new(datetime as i64)
91    }
92}
93
94impl Header for Date {
95    fn write_header(&self, mut output: impl Write, _bytes_written: usize) -> io::Result<usize> {
96        output.write_all(self.to_rfc822().as_bytes())?;
97        output.write_all(b"\r\n")?;
98        Ok(0)
99    }
100}
mail_builder/headers/date.rs

mail_builder/headers/
date.rs
