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118 lines
3.5 KiB
Rust
118 lines
3.5 KiB
Rust
use std::fmt::{self, Display, Write};
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use super::{
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from_one_raw_str, EntityTag, Header, HeaderName, HeaderValue, HttpDate, InvalidHeaderValue,
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TryIntoHeaderValue, Writer,
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};
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use crate::{error::ParseError, http::header, HttpMessage};
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/// `If-Range` header, defined
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/// in [RFC 7233 §3.2](https://datatracker.ietf.org/doc/html/rfc7233#section-3.2)
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///
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/// If a client has a partial copy of a representation and wishes to have
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/// an up-to-date copy of the entire representation, it could use the
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/// Range header field with a conditional GET (using either or both of
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/// If-Unmodified-Since and If-Match.) However, if the precondition
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/// fails because the representation has been modified, the client would
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/// then have to make a second request to obtain the entire current
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/// representation.
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///
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/// The `If-Range` header field allows a client to \"short-circuit\" the
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/// second request. Informally, its meaning is as follows: if the
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/// representation is unchanged, send me the part(s) that I am requesting
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/// in Range; otherwise, send me the entire representation.
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///
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/// # ABNF
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/// ```plain
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/// If-Range = entity-tag / HTTP-date
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/// ```
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///
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/// # Example Values
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///
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/// * `Sat, 29 Oct 1994 19:43:31 GMT`
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/// * `\"xyzzy\"`
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///
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/// # Examples
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/// ```
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/// use actix_web::HttpResponse;
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/// use actix_web::http::header::{EntityTag, IfRange};
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///
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/// let mut builder = HttpResponse::Ok();
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/// builder.insert_header(
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/// IfRange::EntityTag(
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/// EntityTag::new(false, "abc".to_owned())
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/// )
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/// );
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/// ```
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///
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/// ```
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/// use std::time::{Duration, SystemTime};
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/// use actix_web::{http::header::IfRange, HttpResponse};
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///
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/// let mut builder = HttpResponse::Ok();
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/// let fetched = SystemTime::now() - Duration::from_secs(60 * 60 * 24);
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/// builder.insert_header(
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/// IfRange::Date(fetched.into())
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/// );
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/// ```
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#[derive(Clone, Debug, PartialEq, Eq)]
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pub enum IfRange {
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/// The entity-tag the client has of the resource.
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EntityTag(EntityTag),
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/// The date when the client retrieved the resource.
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Date(HttpDate),
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}
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impl Header for IfRange {
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fn name() -> HeaderName {
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header::IF_RANGE
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}
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#[inline]
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fn parse<T>(msg: &T) -> Result<Self, ParseError>
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where
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T: HttpMessage,
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{
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let etag: Result<EntityTag, _> = from_one_raw_str(msg.headers().get(&header::IF_RANGE));
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if let Ok(etag) = etag {
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return Ok(IfRange::EntityTag(etag));
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}
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let date: Result<HttpDate, _> = from_one_raw_str(msg.headers().get(&header::IF_RANGE));
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if let Ok(date) = date {
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return Ok(IfRange::Date(date));
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}
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Err(ParseError::Header)
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}
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}
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impl Display for IfRange {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match *self {
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IfRange::EntityTag(ref x) => Display::fmt(x, f),
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IfRange::Date(ref x) => Display::fmt(x, f),
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}
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}
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}
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impl TryIntoHeaderValue for IfRange {
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type Error = InvalidHeaderValue;
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fn try_into_value(self) -> Result<HeaderValue, Self::Error> {
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let mut writer = Writer::new();
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let _ = write!(&mut writer, "{}", self);
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HeaderValue::from_maybe_shared(writer.take())
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}
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}
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#[cfg(test)]
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mod test_parse_and_format {
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use std::str;
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use super::IfRange as HeaderField;
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use crate::http::header::*;
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crate::http::header::common_header_test!(test1, vec![b"Sat, 29 Oct 1994 19:43:31 GMT"]);
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crate::http::header::common_header_test!(test2, vec![b"\"abc\""]);
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crate::http::header::common_header_test!(test3, vec![b"this-is-invalid"], None::<IfRange>);
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}
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