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use std::fmt::{self, Display};
use std::str::FromStr;
use crate::Error;
use crate::{Cookie, Mime};
/// A header value.
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub struct HeaderValue {
inner: String,
}
impl HeaderValue {
/// Create a new `HeaderValue` from ASCII bytes.
///
/// # Error
///
/// This function will error if the string is not a valid ASCII.
pub fn from_ascii(bytes: &[u8]) -> Result<Self, Error> {
crate::ensure!(bytes.is_ascii(), "Bytes should be valid ASCII");
// This is permitted because ASCII is valid UTF-8, and we just checked that.
let string = unsafe { String::from_utf8_unchecked(bytes.to_vec()) };
Ok(Self { inner: string })
}
/// Converts a vector of bytes to a `HeaderValue` without checking that the string contains
/// valid ASCII.
///
/// # Safety
///
/// This function is unsafe because it does not check that the bytes passed to it are valid
/// ASCII. If this constraint is violated, it may cause memory
/// unsafety issues with future users of the HeaderValue, as the rest of the library assumes
/// that Strings are valid ASCII.
pub unsafe fn from_ascii_unchecked(bytes: Vec<u8>) -> Self {
let string = String::from_utf8_unchecked(bytes);
Self { inner: string }
}
/// Get the header value as a `&str`
pub fn as_str(&self) -> &str {
&self.inner
}
}
impl From<Mime> for HeaderValue {
fn from(mime: Mime) -> Self {
HeaderValue {
inner: format!("{}", mime),
}
}
}
impl From<Cookie<'_>> for HeaderValue {
fn from(cookie: Cookie<'_>) -> Self {
HeaderValue {
inner: cookie.to_string(),
}
}
}
impl From<&Mime> for HeaderValue {
fn from(mime: &Mime) -> Self {
HeaderValue {
inner: format!("{}", mime),
}
}
}
impl FromStr for HeaderValue {
type Err = Error;
/// Create a new `HeaderValue`.
///
/// This checks it's valid ASCII.
fn from_str(s: &str) -> Result<Self, Self::Err> {
crate::ensure!(s.is_ascii(), "String slice should be valid ASCII");
Ok(Self {
inner: String::from(s),
})
}
}
impl Display for HeaderValue {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.inner)
}
}