1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

// Some of the functions in this file are unused when disabling certain features
#![allow(dead_code)]

use std::time::SystemTime;
use time::{OffsetDateTime, Time};

/// Truncates the subseconds from the given `SystemTime` to zero.
pub(crate) fn truncate_subsecs(time: SystemTime) -> SystemTime {
    let date_time = OffsetDateTime::from(time);
    let time = date_time.time();
    date_time
        .replace_time(
            Time::from_hms(time.hour(), time.minute(), time.second()).expect("was already a time"),
        )
        .into()
}

/// Formats a `SystemTime` in `YYYYMMDD` format.
pub(crate) fn format_date(time: SystemTime) -> String {
    let time = OffsetDateTime::from(time);
    format!(
        "{:04}{:02}{:02}",
        time.year(),
        u8::from(time.month()),
        time.day()
    )
}

/// Formats a `SystemTime` in `YYYYMMDD'T'HHMMSS'Z'` format.
pub(crate) fn format_date_time(time: SystemTime) -> String {
    let time = OffsetDateTime::from(time);
    format!(
        "{:04}{:02}{:02}T{:02}{:02}{:02}Z",
        time.year(),
        u8::from(time.month()),
        time.day(),
        time.hour(),
        time.minute(),
        time.second()
    )
}

/// Parse functions that are only needed for unit tests.
#[cfg(test)]
pub(crate) mod test_parsers {
    use std::{borrow::Cow, error::Error, fmt, time::SystemTime};
    use time::format_description;
    use time::{Date, PrimitiveDateTime, Time};

    const DATE_TIME_FORMAT: &str = "[year][month][day]T[hour][minute][second]Z";
    const DATE_FORMAT: &str = "[year][month][day]";

    /// Parses `YYYYMMDD'T'HHMMSS'Z'` formatted dates into a `SystemTime`.
    pub(crate) fn parse_date_time(date_time_str: &str) -> Result<SystemTime, ParseError> {
        let date_time = PrimitiveDateTime::parse(
            date_time_str,
            &format_description::parse(DATE_TIME_FORMAT).unwrap(),
        )
        .map_err(|err| ParseError(err.to_string().into()))?
        .assume_utc();
        Ok(date_time.into())
    }

    /// Parses `YYYYMMDD` formatted dates into a `SystemTime`.
    pub(crate) fn parse_date(date_str: &str) -> Result<SystemTime, ParseError> {
        let date_time = PrimitiveDateTime::new(
            Date::parse(date_str, &format_description::parse(DATE_FORMAT).unwrap())
                .map_err(|err| ParseError(err.to_string().into()))?,
            Time::from_hms(0, 0, 0).unwrap(),
        )
        .assume_utc();
        Ok(date_time.into())
    }

    #[derive(Debug)]
    pub(crate) struct ParseError(Cow<'static, str>);

    impl fmt::Display for ParseError {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            write!(f, "failed to parse time: {}", self.0)
        }
    }

    impl Error for ParseError {}
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::date_time::test_parsers::{parse_date, parse_date_time};
    use time::format_description::well_known::Rfc3339;

    // TODO(https://github.com/awslabs/smithy-rs/issues/1857)
    #[cfg(not(any(target_arch = "powerpc", target_arch = "x86")))]
    #[test]
    fn date_format() {
        let time: SystemTime = OffsetDateTime::parse("2039-02-04T23:01:09.104Z", &Rfc3339)
            .unwrap()
            .into();
        assert_eq!("20390204", format_date(time));
        let time: SystemTime = OffsetDateTime::parse("0100-01-02T00:00:00.000Z", &Rfc3339)
            .unwrap()
            .into();
        assert_eq!("01000102", format_date(time));
    }

    // TODO(https://github.com/awslabs/smithy-rs/issues/1857)
    #[cfg(not(any(target_arch = "powerpc", target_arch = "x86")))]
    #[test]
    fn date_time_format() {
        let time: SystemTime = OffsetDateTime::parse("2039-02-04T23:01:09.104Z", &Rfc3339)
            .unwrap()
            .into();
        assert_eq!("20390204T230109Z", format_date_time(time));
        let time: SystemTime = OffsetDateTime::parse("0100-01-02T00:00:00.000Z", &Rfc3339)
            .unwrap()
            .into();
        assert_eq!("01000102T000000Z", format_date_time(time));
    }

    #[test]
    fn date_time_roundtrip() {
        let time = parse_date_time("20150830T123600Z").unwrap();
        assert_eq!("20150830T123600Z", format_date_time(time));
    }

    #[test]
    fn date_roundtrip() {
        let time = parse_date("20150830").unwrap();
        assert_eq!("20150830", format_date(time));
    }

    // TODO(https://github.com/awslabs/smithy-rs/issues/1857)
    #[cfg(not(any(target_arch = "powerpc", target_arch = "x86")))]
    #[test]
    fn test_truncate_subsecs() {
        let time: SystemTime = OffsetDateTime::parse("2039-02-04T23:01:09.104Z", &Rfc3339)
            .unwrap()
            .into();
        let expected: SystemTime = OffsetDateTime::parse("2039-02-04T23:01:09.000Z", &Rfc3339)
            .unwrap()
            .into();
        assert_eq!(expected, truncate_subsecs(time));
    }
}