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Pyfisch
2016-10-02 22:29:41 +02:00
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.gitignore
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target
Cargo.lock
Cargo.toml
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[package]
name = "httpdate"
version = "0.1.0"
authors = ["Pyfisch <pyfisch@gmail.com>"]
license = "MIT/Apache-2.0"
description = "HTTP date parsing and formatting"
keywords = ["http", "date", "time", "simple", "timestamp"]
[dependencies]
LICENSE-APACHE
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LICENSE-MIT
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Copyright (c) 2016 Pyfisch
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src/datetime.rs
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use std::fmt::{self, Display, Formatter};
use std::str::FromStr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
#[derive(Debug)]
pub struct DateTime {
/// 0...59
sec: u8,
/// 0...59
min: u8,
/// 0...23
hour: u8,
/// 1...31
day: u8,
/// 1...12
mon: u8,
/// 1000...9999
year: u16,
/// 1...7
wday: u8,
}
impl From<SystemTime> for DateTime {
fn from(v: SystemTime) -> DateTime {
let secs_since_epoch = v.duration_since(UNIX_EPOCH).unwrap().as_secs();
let mut days = secs_since_epoch / 86400;
let wday = ((days + 3) % 7) + 1;
let secs_of_day = secs_since_epoch % 86400;
let mut year = 1970;
loop {
let ydays = if is_leap_year(year) {
366
} else {
365
};
if days >= ydays {
days -= ydays;
year += 1;
} else {
break;
}
}
let mut months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if is_leap_year(year) {
months[1] += 1;
}
let mut mon = 0;
for mon_len in months.iter() {
mon += 1;
if days < *mon_len {
break;
}
days -= *mon_len;
}
let mday = days + 1;
DateTime {
sec: (secs_of_day % 60) as u8,
min: ((secs_of_day % 3600) / 60) as u8,
hour: (secs_of_day / 3600) as u8,
day: mday as u8,
mon: mon as u8,
year: year,
wday: wday as u8,
}
}
}
impl From<DateTime> for SystemTime {
fn from(v: DateTime) -> SystemTime {
let leap_years = ((v.year - 1) - 1968) / 4
- ((v.year - 1) - 1900) / 100
+ ((v.year - 1) - 1600) / 400;
let mut ydays = match v.mon {
1 => 0,
2 => 31,
3 => 59,
4 => 90,
5 => 120,
6 => 151,
7 => 181,
8 => 212,
9 => 243,
10 => 273,
11 => 304,
12 => 334,
_ => unreachable!(),
} + v.day as u64 - 1;
if is_leap_year(v.year) && v.mon > 2 {
ydays += 1;
}
let days = (v.year as u64 - 1970) * 365 + leap_years as u64 + ydays;
UNIX_EPOCH + Duration::from_secs(v.sec as u64
+ v.min as u64 * 60
+ v.hour as u64 * 3600
+ days * 86400)
}
}
impl FromStr for DateTime {
type Err = ();
fn from_str(s: &str) -> Result<DateTime, ()> {
let s = s.trim();
parse_imf_fixdate(s)
.or_else(|_| parse_rfc850_date(s))
.or_else(|_| parse_asctime(s))
}
}
impl Display for DateTime {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{wday}, {day:02} {mon} {year} {hour:02}:{min:02}:{sec:02} GMT",
sec=self.sec,
min=self.min,
hour=self.hour,
day=self.day,
mon=match self.mon {
1 => "Jan",
2 => "Feb",
3 => "Mar",
4 => "Apr",
5 => "Mai",
6 => "Jun",
7 => "Jul",
8 => "Aug",
9 => "Sep",
10 => "Oct",
11 => "Nov",
12 => "Dec",
_ => unreachable!(),
},
year=self.year,
wday=match self.wday {
1 => "Mon",
2 => "Tue",
3 => "Wed",
4 => "Thu",
5 => "Fri",
6 => "Sat",
7 => "Sun",
_ => unreachable!(),
},
)
}
}
fn parse_imf_fixdate(s: &str) -> Result<DateTime, ()> {
if s.len() != 29 || &s[25..] != " GMT" {
return Err(())
}
Ok(DateTime {
sec: try!(s[23..25].parse().map_err(|_| ())),
min: try!(s[20..22].parse().map_err(|_| ())),
hour: try!(s[17..19].parse().map_err(|_| ())),
day: try!(s[5..7].parse().map_err(|_| ())),
mon: match &s[7..12] {
" Jan " => 1,
" Feb " => 2,
" Mar " => 3,
" Apr " => 4,
" Mai " => 5,
" Jun " => 6,
" Jul " => 7,
" Aug " => 8,
" Sep " => 9,
" Oct " => 10,
" Nov " => 11,
" Dec " => 12,
_ => return Err(()),
},
year: try!(s[12..16].parse().map_err(|_| ())),
wday: match &s[..5] {
"Mon, " => 1,
"Tue, " => 2,
"Wed, " => 3,
"Thu, " => 4,
"Fri, " => 5,
"Sat, " => 6,
"Sun, " => 7,
_ => return Err(()),
},
})
}
fn parse_rfc850_date(s: &str) -> Result<DateTime, ()> {
if !s.ends_with(" GMT") {
return Err(())
}
let (wday, s) = if s.starts_with("Monday, ") { (1, &s[8..]) }
else if s.starts_with("Tuesday, ") { (2, &s[9..]) }
else if s.starts_with("Wednesday, ") { (3, &s[11..]) }
else if s.starts_with("Thursday, ") { (4, &s[10..]) }
else if s.starts_with("Friday, ") { (5, &s[8..]) }
else if s.starts_with("Saturday, ") { (6, &s[10..]) }
else if s.starts_with("Sunday, ") { (7, &s[8..]) }
else { return Err(()); };
if s.len() != 22 {
return Err(())
}
let mut year = try!(s[7..9].parse::<u16>().map_err(|_| ()));
if year < 80 {
year += 2000;
} else {
year += 1900;
}
Ok(DateTime {
sec: try!(s[16..18].parse().map_err(|_| ())),
min: try!(s[13..15].parse().map_err(|_| ())),
hour: try!(s[10..12].parse().map_err(|_| ())),
day: try!(s[0..2].parse().map_err(|_| ())),
mon: match &s[2..7] {
"-Jan-" => 1,
"-Feb-" => 2,
"-Mar-" => 3,
"-Apr-" => 4,
"-Mai-" => 5,
"-Jun-" => 6,
"-Jul-" => 7,
"-Aug-" => 8,
"-Sep-" => 9,
"-Oct-" => 10,
"-Nov-" => 11,
"-Dec-" => 12,
_ => return Err(()),
},
year: year,
wday: wday,
})
}
fn parse_asctime(s: &str) -> Result<DateTime, ()> {
if s.len() != 24 {
return Err(())
}
Ok(DateTime {
sec: try!(s[17..19].parse().map_err(|_| ())),
min: try!(s[14..16].parse().map_err(|_| ())),
hour: try!(s[11..13].parse().map_err(|_| ())),
day: try!(s[8..10].trim_left().parse().map_err(|_| ())),
mon: match &s[4..8] {
"Jan " => 1,
"Feb " => 2,
"Mar " => 3,
"Apr " => 4,
"Mai " => 5,
"Jun " => 6,
"Jul " => 7,
"Aug " => 8,
"Sep " => 9,
"Oct " => 10,
"Nov " => 11,
"Dec " => 12,
_ => return Err(()),
},
year: try!(s[20..24].parse().map_err(|_| ())),
wday: match &s[0..4] {
"Mon " => 1,
"Tue " => 2,
"Wed " => 3,
"Thu " => 4,
"Fri " => 5,
"Sat " => 6,
"Sun " => 7,
_ => return Err(()),
},
})
}
fn is_leap_year(y: u16) -> bool {
y % 4 == 0 && (!(y % 100 == 0) || y % 400 == 0)
}
src/lib.rs
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//! Date and time utils for HTTP.
//!
//! Multiple HTTP header fields store timestamps.
//! For example a response created on May 15, 2015 may contain the header
//! `Date: Fri, 15 May 2015 15:34:21 GMT`. Since the timestamp does not
//! contain any timezone or leap second information it is equvivalent to
//! writing 1431696861 Unix time. Rust’s `SystemTime` is used to store
//! these timestamps.
//!
//! This crate provides two public functions:
//! * `parse_http_date` to parse a HTTP datetime string to a system time
//! * `fmt_http_date` to format a system time to a IMF-fixdate
use std::time::SystemTime;
use datetime::DateTime;
mod datetime;
/// Parse a date from an HTTP header field.
///
/// Supports the preferred IMF-fixdate and the legacy RFC 805 and
/// ascdate formats. Two digit years are mapped to dates between
/// 1980 and 2079.
pub fn parse_http_date(s: &str) -> Result<SystemTime, ()> {
s.parse::<DateTime>().map(|d| d.into())
}
/// Format a date to be used in a HTTP header field.
pub fn fmt_http_date(d: SystemTime) -> String {
format!("{}", DateTime::from(d))
}
#[cfg(test)]
mod tests {
use std::time::{Duration, UNIX_EPOCH};
use super::{parse_http_date, fmt_http_date};
#[test]
fn test_rfc_example() {
let d = UNIX_EPOCH + Duration::from_secs(784111777);
assert_eq!(d, parse_http_date("Sun, 06 Nov 1994 08:49:37 GMT").unwrap());
assert_eq!(d, parse_http_date("Sunday, 06-Nov-94 08:49:37 GMT").unwrap());
assert_eq!(d, parse_http_date("Sun Nov 6 08:49:37 1994").unwrap());
}
#[test]
fn test2() {
let d = UNIX_EPOCH + Duration::from_secs(1475419451);
assert_eq!(d, parse_http_date("Sun, 02 Oct 2016 14:44:11 GMT").unwrap());
}
#[test]
fn test3() {
let mut d = UNIX_EPOCH;
assert_eq!(d, parse_http_date("Thu, 01 Jan 1970 00:00:00 GMT").unwrap());
d += Duration::from_secs(3600);
assert_eq!(d, parse_http_date("Thu, 01 Jan 1970 01:00:00 GMT").unwrap());
d += Duration::from_secs(86400);
assert_eq!(d, parse_http_date("Fri, 02 Jan 1970 01:00:00 GMT").unwrap());
d += Duration::from_secs(2592000);
assert_eq!(d, parse_http_date("Sun, 01 Feb 1970 01:00:00 GMT").unwrap());
d += Duration::from_secs(2592000);
assert_eq!(d, parse_http_date("Tue, 03 Mar 1970 01:00:00 GMT").unwrap());
d += Duration::from_secs(31536005);
assert_eq!(d, parse_http_date("Wed, 03 Mar 1971 01:00:05 GMT").unwrap());
d += Duration::from_secs(15552000);
assert_eq!(d, parse_http_date("Mon, 30 Aug 1971 01:00:05 GMT").unwrap());
d += Duration::from_secs(6048000);
assert_eq!(d, parse_http_date("Mon, 08 Nov 1971 01:00:05 GMT").unwrap());
d += Duration::from_secs(864000000);
assert_eq!(d, parse_http_date("Fri, 26 Mar 1999 01:00:05 GMT").unwrap());
}
#[test]
fn test_fmt() {
let d = UNIX_EPOCH;
assert_eq!(fmt_http_date(d), "Thu, 01 Jan 1970 00:00:00 GMT");
let d = UNIX_EPOCH + Duration::from_secs(1475419451);
assert_eq!(fmt_http_date(d), "Sun, 02 Oct 2016 14:44:11 GMT");
}
}