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73 lines
2.7 KiB
Rust
73 lines
2.7 KiB
Rust
use time::{Date, OffsetDateTime, PrimitiveDateTime};
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/// Attempt to parse a `time` string as one of either RFC 1123, RFC 850, or asctime.
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pub(crate) fn parse_http_date(time: &str) -> Option<PrimitiveDateTime> {
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try_parse_rfc_1123(time)
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.or_else(|| try_parse_rfc_850(time))
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.or_else(|| try_parse_asctime(time))
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}
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/// Attempt to parse a `time` string as a RFC 1123 formatted date time string.
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///
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/// Eg: `Fri, 12 Feb 2021 00:14:29 GMT`
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fn try_parse_rfc_1123(time: &str) -> Option<PrimitiveDateTime> {
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time::parse(time, "%a, %d %b %Y %H:%M:%S").ok()
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}
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/// Attempt to parse a `time` string as a RFC 850 formatted date time string.
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///
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/// Eg: `Wednesday, 11-Jan-21 13:37:41 UTC`
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fn try_parse_rfc_850(time: &str) -> Option<PrimitiveDateTime> {
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let dt = PrimitiveDateTime::parse(time, "%A, %d-%b-%y %H:%M:%S").ok()?;
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// If the `time` string contains a two-digit year, then as per RFC 2616 § 19.3,
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// we consider the year as part of this century if it's within the next 50 years,
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// otherwise we consider as part of the previous century.
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let now = OffsetDateTime::now_utc();
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let century_start_year = (now.year() / 100) * 100;
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let mut expanded_year = century_start_year + dt.year();
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if expanded_year > now.year() + 50 {
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expanded_year -= 100;
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}
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let date = Date::try_from_ymd(expanded_year, dt.month(), dt.day()).ok()?;
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Some(PrimitiveDateTime::new(date, dt.time()))
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}
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/// Attempt to parse a `time` string using ANSI C's `asctime` format.
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///
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/// Eg: `Wed Feb 13 15:46:11 2013`
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fn try_parse_asctime(time: &str) -> Option<PrimitiveDateTime> {
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time::parse(time, "%a %b %_d %H:%M:%S %Y").ok()
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}
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#[cfg(test)]
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mod tests {
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use time::{date, time};
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use super::*;
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#[test]
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fn test_rfc_850_year_shift() {
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let date = try_parse_rfc_850("Friday, 19-Nov-82 16:14:55 EST").unwrap();
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assert_eq!(date, date!(1982 - 11 - 19).with_time(time!(16:14:55)));
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let date = try_parse_rfc_850("Wednesday, 11-Jan-62 13:37:41 EST").unwrap();
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assert_eq!(date, date!(2062 - 01 - 11).with_time(time!(13:37:41)));
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let date = try_parse_rfc_850("Wednesday, 11-Jan-21 13:37:41 EST").unwrap();
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assert_eq!(date, date!(2021 - 01 - 11).with_time(time!(13:37:41)));
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let date = try_parse_rfc_850("Wednesday, 11-Jan-23 13:37:41 EST").unwrap();
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assert_eq!(date, date!(2023 - 01 - 11).with_time(time!(13:37:41)));
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let date = try_parse_rfc_850("Wednesday, 11-Jan-99 13:37:41 EST").unwrap();
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assert_eq!(date, date!(1999 - 01 - 11).with_time(time!(13:37:41)));
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let date = try_parse_rfc_850("Wednesday, 11-Jan-00 13:37:41 EST").unwrap();
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assert_eq!(date, date!(2000 - 01 - 11).with_time(time!(13:37:41)));
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}
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}
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