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use std::ascii::AsciiExt;
use std::str;
use Request;
use Response;
pub fn apply(request: &Request, response: Response) -> Response {
if !response_is_text(&response) {
return response;
}
if response.headers.iter().any(|&(ref key, _)| key.eq_ignore_ascii_case("Content-Encoding")) {
return response;
}
let mut response = Some(response);
for encoding in accepted_content_encodings(request) {
if gzip(encoding, &mut response) {
return response.take().unwrap();
}
if encoding.eq_ignore_ascii_case("identity") {
return response.take().unwrap();
}
}
response.take().unwrap()
}
fn response_is_text(response: &Response) -> bool {
response.headers.iter().any(|&(ref key, ref value)| {
if !key.eq_ignore_ascii_case("Content-Type") {
return false;
}
value.starts_with("text/") || value.contains("javascript") || value.contains("json") ||
value.contains("xml")
})
}
pub fn accepted_content_encodings(request: &Request) -> AcceptedContentEncodingsIter {
let elems = request.header("Accept-Encoding").unwrap_or("").split(',');
AcceptedContentEncodingsIter { elements: elems }
}
pub struct AcceptedContentEncodingsIter<'a> {
elements: str::Split<'a, char>
}
impl<'a> Iterator for AcceptedContentEncodingsIter<'a> {
type Item = &'a str;
#[inline]
fn next(&mut self) -> Option<&'a str> {
loop {
match self.elements.next() {
None => return None,
Some(e) => {
let e = e.trim();
if !e.is_empty() {
return Some(e);
}
}
}
}
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
let (_, max) = self.elements.size_hint();
(0, max)
}
}
#[cfg(feature = "gzip")]
fn gzip(e: &str, response: &mut Option<Response>) -> bool {
use ResponseBody;
use std::mem;
use flate2::Compression;
use flate2::read::GzEncoder;
if !e.eq_ignore_ascii_case("gzip") {
return false;
}
let mut response = response.as_mut().unwrap();
response.headers.push(("Content-Encoding".into(), "gzip".into()));
let previous_body = mem::replace(&mut response.data, ResponseBody::empty());
let (raw_data, _) = previous_body.into_reader_and_size();
response.data = ResponseBody::from_reader(GzEncoder::new(raw_data, Compression::Default));
true
}
#[cfg(not(feature = "gzip"))]
#[inline]
fn gzip(e: &str, response: &mut Option<Response>) -> bool {
false
}
#[cfg(test)]
mod tests {
use Request;
use content_encoding;
#[test]
fn no_req_encodings() {
let request = Request::fake_http("GET", "/", vec![], vec![]);
assert_eq!(content_encoding::accepted_content_encodings(&request).count(), 0);
}
#[test]
fn empty_req_encodings() {
let request = {
let h = vec![("Accept-Encoding".to_owned(), "".to_owned())];
Request::fake_http("GET", "/", h, vec![])
};
assert_eq!(content_encoding::accepted_content_encodings(&request).count(), 0);
}
#[test]
fn one_req_encoding() {
let request = {
let h = vec![("Accept-Encoding".to_owned(), "foo".to_owned())];
Request::fake_http("GET", "/", h, vec![])
};
let mut list = content_encoding::accepted_content_encodings(&request);
assert_eq!(list.next().unwrap(), "foo");
assert_eq!(list.next(), None);
}
#[test]
fn multi_req_encoding() {
let request = {
let h = vec![("Accept-Encoding".to_owned(), "foo, bar".to_owned())];
Request::fake_http("GET", "/", h, vec![])
};
let mut list = content_encoding::accepted_content_encodings(&request);
assert_eq!(list.next().unwrap(), "foo");
assert_eq!(list.next().unwrap(), "bar");
assert_eq!(list.next(), None);
}
}