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

use crate::headers::{HeaderName, HeaderValue, Headers, DATE};
use crate::utils::HttpDate;

use std::time::SystemTime;

/// The date and time at which the message originated.

///

/// # Specifications

///

/// - [RFC 7231, section 7.1.1.2: Date](https://tools.ietf.org/html/rfc7231#section-7.1.1.2)

///

/// # Examples

///

/// ```

/// # fn main() -> http_types::Result<()> {

/// #

/// use http_types::Response;

/// use http_types::other::Date;

///

/// use std::time::{Duration, SystemTime};

///

/// let now = SystemTime::now();

/// let date = Date::new(now);

///

/// let mut res = Response::new(200);

/// date.apply(&mut res);

///

/// let date = Date::from_headers(res)?.unwrap();

///

/// // Validate we're within 1 second accurate of the system time.

/// assert!(now.duration_since(date.into())? <= Duration::from_secs(1));

/// #

/// # Ok(()) }

/// ```

#[derive(Debug)]
pub struct Date {
    at: SystemTime,
}

impl Date {
    /// Create a new instance.

    pub fn new(at: SystemTime) -> Self {
        Self { at }
    }

    /// Create a new instance with the date set to now.

    pub fn now() -> Self {
        Self {
            at: SystemTime::now(),
        }
    }

    /// Create a new instance from headers.

    pub fn from_headers(headers: impl AsRef<Headers>) -> crate::Result<Option<Self>> {
        let headers = match headers.as_ref().get(DATE) {
            Some(headers) => headers,
            None => return Ok(None),
        };

        // If we successfully parsed the header then there's always at least one

        // entry. We want the last entry.

        let value = headers.iter().last().unwrap();
        let date: HttpDate = value
            .as_str()
            .trim()
            .parse()
            .map_err(|mut e: crate::Error| {
                e.set_status(400);
                e
            })?;
        let at = date.into();
        Ok(Some(Self { at }))
    }

    /// Sets the header.

    pub fn apply(&self, mut headers: impl AsMut<Headers>) {
        headers.as_mut().insert(self.name(), self.value());
    }

    /// Get the `HeaderName`.

    pub fn name(&self) -> HeaderName {
        DATE
    }

    /// Get the `HeaderValue`.

    pub fn value(&self) -> HeaderValue {
        let date: HttpDate = self.at.into();
        let output = format!("{}", date);

        // SAFETY: the internal string is validated to be ASCII.

        unsafe { HeaderValue::from_bytes_unchecked(output.into()) }
    }
}

impl From<Date> for SystemTime {
    fn from(date: Date) -> Self {
        date.at
    }
}

impl From<SystemTime> for Date {
    fn from(time: SystemTime) -> Self {
        Self { at: time }
    }
}

impl PartialEq<SystemTime> for Date {
    fn eq(&self, other: &SystemTime) -> bool {
        &self.at == other
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use crate::headers::Headers;
    use std::time::Duration;

    #[test]
    fn smoke() -> crate::Result<()> {
        let now = SystemTime::now();
        let date = Date::new(now);

        let mut headers = Headers::new();
        date.apply(&mut headers);

        let date = Date::from_headers(headers)?.unwrap();

        // Validate we're within 1 second accurate of the system time.

        assert!(now.duration_since(date.into())? <= Duration::from_secs(1));
        Ok(())
    }

    #[test]
    fn bad_request_on_parse_error() -> crate::Result<()> {
        let mut headers = Headers::new();
        headers.insert(DATE, "<nori ate the tag. yum.>");
        let err = Date::from_headers(headers).unwrap_err();
        assert_eq!(err.status(), 400);
        Ok(())
    }
}