use ascii::AsciiString;
use error::Error;
use std::str::FromStr;
#[derive(Clone)]
pub struct Header {
line: AsciiString,
index: usize,
}
impl ::std::fmt::Debug for Header {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::result::Result<(), ::std::fmt::Error> {
write!(f, "{}", self.line)
}
}
impl Header {
pub fn new(name: &str, value: &str) -> Result<Self, Error> {
let line =
AsciiString::from_str(&format!("{}: {}", name, value)).map_err(|_| Error::BadHeader)?;
let index = name.len();
Ok(Header { line, index })
}
pub fn name(&self) -> &str {
&self.line.as_str()[0..self.index]
}
pub fn value(&self) -> &str {
&self.line.as_str()[self.index + 1..].trim()
}
pub fn is_name(&self, other: &str) -> bool {
self.name().eq_ignore_ascii_case(other)
}
}
pub fn get_header<'a, 'b>(headers: &'b Vec<Header>, name: &'a str) -> Option<&'b str> {
headers.iter().find(|h| h.is_name(name)).map(|h| h.value())
}
pub fn get_all_headers<'a, 'b>(headers: &'b Vec<Header>, name: &'a str) -> Vec<&'b str> {
headers
.iter()
.filter(|h| h.is_name(name))
.map(|h| h.value())
.collect()
}
pub fn has_header(headers: &Vec<Header>, name: &str) -> bool {
get_header(headers, name).is_some()
}
pub fn add_header(headers: &mut Vec<Header>, header: Header) {
if !header.name().to_lowercase().starts_with("x-") {
let name = header.name();
headers.retain(|h| h.name() != name);
}
headers.push(header);
}
impl FromStr for Header {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let line = AsciiString::from_str(s).map_err(|_| Error::BadHeader)?;
let index = s.find(":").ok_or_else(|| Error::BadHeader)?;
if index >= s.len() {
return Err(Error::BadHeader);
}
Ok(Header { line, index })
}
}