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utils.rs
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utils.rs
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use std::{fmt, str::FromStr};
use super::HeaderValue;
use crate::{error::ParseError, header::HTTP_VALUE};
/// Reads a comma-delimited raw header into a Vec.
#[inline]
pub fn from_comma_delimited<'a, I, T>(all: I) -> Result<Vec<T>, ParseError>
where
I: Iterator<Item = &'a HeaderValue> + 'a,
T: FromStr,
{
let mut result = Vec::new();
for h in all {
let s = h.to_str().map_err(|_| ParseError::Header)?;
result.extend(
s.split(',')
.filter_map(|x| match x.trim() {
"" => None,
y => Some(y),
})
.filter_map(|x| x.trim().parse().ok()),
)
}
Ok(result)
}
/// Reads a single string when parsing a header.
#[inline]
pub fn from_one_raw_str<T: FromStr>(val: Option<&HeaderValue>) -> Result<T, ParseError> {
if let Some(line) = val {
let line = line.to_str().map_err(|_| ParseError::Header)?;
if !line.is_empty() {
return T::from_str(line).or(Err(ParseError::Header));
}
}
Err(ParseError::Header)
}
/// Format an array into a comma-delimited string.
#[inline]
pub fn fmt_comma_delimited<T>(f: &mut fmt::Formatter<'_>, parts: &[T]) -> fmt::Result
where
T: fmt::Display,
{
let mut iter = parts.iter();
if let Some(part) = iter.next() {
fmt::Display::fmt(part, f)?;
}
for part in iter {
f.write_str(", ")?;
fmt::Display::fmt(part, f)?;
}
Ok(())
}
/// Percent encode a sequence of bytes with a character set defined in
/// <https://tools.ietf.org/html/rfc5987#section-3.2>
#[inline]
pub fn http_percent_encode(f: &mut fmt::Formatter<'_>, bytes: &[u8]) -> fmt::Result {
let encoded = percent_encoding::percent_encode(bytes, HTTP_VALUE);
fmt::Display::fmt(&encoded, f)
}