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use std::{
fmt,
str::{self, FromStr},
};
use bytes::Bytes;
use http::header::HeaderValue;
use super::IterExt;
/// A value that is both a valid `HeaderValue` and `String`.
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub(crate) struct HeaderValueString {
/// Care must be taken to only set this value when it is also
/// a valid `String`, since `as_str` will convert to a `&str`
/// in an unchecked manner.
value: HeaderValue,
}
impl HeaderValueString {
pub(crate) fn from_val(val: &HeaderValue) -> Result<Self, ::Error> {
if val.to_str().is_ok() {
Ok(HeaderValueString { value: val.clone() })
} else {
Err(::Error::invalid())
}
}
pub(crate) fn from_string(src: String) -> Option<Self> {
// A valid `str` (the argument)...
let bytes = Bytes::from(src);
HeaderValue::from_maybe_shared(bytes)
.ok()
.map(|value| HeaderValueString { value })
}
pub(crate) fn from_static(src: &'static str) -> HeaderValueString {
// A valid `str` (the argument)...
HeaderValueString {
value: HeaderValue::from_static(src),
}
}
pub(crate) fn as_str(&self) -> &str {
// HeaderValueString is only created from HeaderValues
// that have validated they are also UTF-8 strings.
unsafe { str::from_utf8_unchecked(self.value.as_bytes()) }
}
}
impl fmt::Debug for HeaderValueString {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(self.as_str(), f)
}
}
impl fmt::Display for HeaderValueString {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self.as_str(), f)
}
}
impl super::TryFromValues for HeaderValueString {
fn try_from_values<'i, I>(values: &mut I) -> Result<Self, ::Error>
where
I: Iterator<Item = &'i HeaderValue>,
{
values
.just_one()
.map(HeaderValueString::from_val)
.unwrap_or_else(|| Err(::Error::invalid()))
}
}
impl<'a> From<&'a HeaderValueString> for HeaderValue {
fn from(src: &'a HeaderValueString) -> HeaderValue {
src.value.clone()
}
}
#[derive(Debug)]
pub(crate) struct FromStrError(());
impl FromStr for HeaderValueString {
type Err = FromStrError;
fn from_str(src: &str) -> Result<Self, Self::Err> {
// A valid `str` (the argument)...
src.parse()
.map(|value| HeaderValueString { value })
.map_err(|_| FromStrError(()))
}
}