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//! Provides convenience traits and functions to build HTTP responses.
use std::convert::TryInto;
use cookie::Cookie;
use hyper::{HeaderMap, StatusCode, header, http};
use time::{Duration, OffsetDateTime};
use hyper::http::response::Builder;
/// Adds convenience methods to [`Builder`].
pub trait SputnikBuilder {
/// Sets the Content-Type.
fn content_type(self, mime: mime::Mime) -> Builder;
/// Appends the Set-Cookie header.
fn set_cookie(self, cookie: Cookie) -> Builder;
}
/// Creates a new builder with a given Location header and status code.
pub fn redirect(location: &str, code: StatusCode) -> Builder {
Builder::new().status(code).header(header::LOCATION, location)
}
impl SputnikBuilder for Builder {
fn content_type(mut self, mime: mime::Mime) -> Self {
self.headers_mut().map(|h| h.content_type(mime));
self
}
fn set_cookie(mut self, cookie: Cookie) -> Builder {
self.headers_mut().map(|h| h.set_cookie(cookie));
self
}
}
/// Constructs an expired cookie to delete a cookie.
pub fn delete_cookie(name: &str) -> Cookie {
let mut cookie = Cookie::new(name, "");
cookie.set_max_age(Duration::seconds(0));
cookie.set_expires(OffsetDateTime::now_utc() - Duration::days(365));
cookie
}
/// Adds convenience methods to [`HeaderMap`].
pub trait SputnikHeaders {
/// Sets the Content-Type.
fn content_type(&mut self, mime: mime::Mime);
/// Appends a Set-Cookie header.
fn set_cookie(&mut self, cookie: Cookie);
}
impl SputnikHeaders for HeaderMap {
fn content_type(&mut self, mime: mime::Mime) {
self.insert(header::CONTENT_TYPE, mime.to_string().try_into().unwrap());
}
fn set_cookie(&mut self, cookie: Cookie) {
self.append(header::SET_COOKIE, cookie.encoded().to_string().try_into().unwrap());
}
}
/// Adds a convenience method to consume a [`Builder`] with an empty body.
pub trait EmptyBuilder<B> {
/// Consume the builder with an empty body.
fn empty(self) -> http::Result<http::response::Response<B>>;
}
impl EmptyBuilder<hyper::Body> for Builder {
fn empty(self) -> http::Result<http::response::Response<hyper::Body>> {
self.body(hyper::Body::empty())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_set_cookie() {
let mut map = HeaderMap::new();
map.set_cookie(Cookie::new("some", "cookie"));
map.set_cookie(Cookie::new("some", "cookie"));
assert_eq!(map.len(), 2);
}
#[test]
fn test_content_type() {
let mut map = HeaderMap::new();
map.content_type(mime::TEXT_PLAIN);
map.content_type(mime::TEXT_HTML);
assert_eq!(map.len(), 1);
assert_eq!(map.get(header::CONTENT_TYPE).unwrap(), "text/html");
}
}
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