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use std::time::SystemTime;
use super::{ETag, LastModified};
use util::{EntityTag, HttpDate};
use HeaderValue;
#[derive(Clone, Debug, PartialEq)]
pub struct IfRange(IfRange_);
derive_header! {
IfRange(_),
name: IF_RANGE
}
impl IfRange {
pub fn etag(tag: ETag) -> IfRange {
IfRange(IfRange_::EntityTag(tag.0))
}
pub fn date(time: SystemTime) -> IfRange {
IfRange(IfRange_::Date(time.into()))
}
pub fn is_modified(&self, etag: Option<&ETag>, last_modified: Option<&LastModified>) -> bool {
match self.0 {
IfRange_::Date(since) => last_modified.map(|time| since < time.0).unwrap_or(true),
IfRange_::EntityTag(ref entity) => etag.map(|etag| !etag.0.strong_eq(entity)).unwrap_or(true),
}
}
}
#[derive(Clone, Debug, PartialEq)]
enum IfRange_ {
EntityTag(EntityTag),
Date(HttpDate),
}
impl ::util::TryFromValues for IfRange_ {
fn try_from_values<'i, I>(values: &mut I) -> Result<Self, ::Error>
where
I: Iterator<Item = &'i HeaderValue>,
{
values
.next()
.and_then(|val| {
if let Some(tag) = EntityTag::from_val(val) {
return Some(IfRange_::EntityTag(tag));
}
let date = HttpDate::from_val(val)?;
Some(IfRange_::Date(date))
})
.ok_or_else(::Error::invalid)
}
}
impl<'a> From<&'a IfRange_> for HeaderValue {
fn from(if_range: &'a IfRange_) -> HeaderValue {
match *if_range {
IfRange_::EntityTag(ref tag) => tag.into(),
IfRange_::Date(ref date) => date.into(),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_is_modified_etag() {
let etag = ETag::from_static("\"xyzzy\"");
let if_range = IfRange::etag(etag.clone());
assert!(!if_range.is_modified(Some(&etag), None));
let etag = ETag::from_static("W/\"xyzzy\"");
assert!(if_range.is_modified(Some(&etag), None));
}
}