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use crate::headers::{HeaderName, HeaderValue, Headers, ToHeaderValues, LAST_MODIFIED};
use crate::utils::{fmt_http_date, parse_http_date};
use std::fmt::Debug;
use std::option;
use std::time::SystemTime;
#[derive(Debug, Ord, PartialOrd, Eq, PartialEq)]
pub struct LastModified {
instant: SystemTime,
}
impl LastModified {
pub fn new(instant: SystemTime) -> Self {
Self { instant }
}
pub fn modified(&self) -> SystemTime {
self.instant
}
pub fn from_headers(headers: impl AsRef<Headers>) -> crate::Result<Option<Self>> {
let headers = match headers.as_ref().get(LAST_MODIFIED) {
Some(headers) => headers,
None => return Ok(None),
};
let header = headers.iter().last().unwrap();
let instant = parse_http_date(header.as_str())?;
Ok(Some(Self { instant }))
}
pub fn apply(&self, mut headers: impl AsMut<Headers>) {
headers.as_mut().insert(LAST_MODIFIED, self.value());
}
pub fn name(&self) -> HeaderName {
LAST_MODIFIED
}
pub fn value(&self) -> HeaderValue {
let output = fmt_http_date(self.instant);
unsafe { HeaderValue::from_bytes_unchecked(output.into()) }
}
}
impl ToHeaderValues for LastModified {
type Iter = option::IntoIter<HeaderValue>;
fn to_header_values(&self) -> crate::Result<Self::Iter> {
Ok(self.value().to_header_values().unwrap())
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::headers::Headers;
use std::time::Duration;
#[test]
fn smoke() -> crate::Result<()> {
let time = SystemTime::now() + Duration::from_secs(5 * 60);
let last_modified = LastModified::new(time);
let mut headers = Headers::new();
last_modified.apply(&mut headers);
let last_modified = LastModified::from_headers(headers)?.unwrap();
let elapsed = time.duration_since(last_modified.modified())?;
assert_eq!(elapsed.as_secs(), 0);
Ok(())
}
#[test]
fn bad_request_on_parse_error() {
let mut headers = Headers::new();
headers.insert(LAST_MODIFIED, "<nori ate the tag. yum.>");
let err = LastModified::from_headers(headers).unwrap_err();
assert_eq!(err.status(), 400);
}
}