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pub use tsukuyomi_macros::Responder;
use {
bytes::{Buf, Bytes, IntoBuf},
crate::{
common::Never,
error::Error,
input::{body::RequestBody, Input},
},
either::Either,
futures::{Poll, Stream},
http::{header::HeaderMap, Response, StatusCode},
hyper::body::{Body, Payload},
serde::Serialize,
};
#[doc(hidden)]
pub mod internal {
use crate::{
error::Error,
input::Input,
output::{Responder, ResponseBody},
};
pub use http::Response;
#[inline]
pub fn respond_to<T>(t: T, input: &mut Input<'_>) -> Result<Response<ResponseBody>, Error>
where
T: Responder,
{
Responder::respond_to(t, input)
.map(|resp| resp.map(Into::into))
.map_err(Into::into)
}
}
#[derive(Debug, Default)]
pub struct ResponseBody(Body);
impl ResponseBody {
#[inline]
pub fn empty() -> Self {
Self::default()
}
pub fn wrap_stream<S>(stream: S) -> Self
where
S: Stream + Send + 'static,
S::Error: Into<Box<dyn std::error::Error + Send + Sync + 'static>>,
S::Item: IntoBuf,
{
ResponseBody(Body::wrap_stream(
stream.map(|chunk| chunk.into_buf().collect::<Bytes>()),
))
}
}
impl From<()> for ResponseBody {
fn from(_: ()) -> Self {
ResponseBody(Body::empty())
}
}
impl From<RequestBody> for ResponseBody {
fn from(body: RequestBody) -> Self {
ResponseBody(body.into_inner())
}
}
macro_rules! impl_response_body {
($($t:ty,)*) => {$(
impl From<$t> for ResponseBody {
fn from(body: $t) -> Self {
ResponseBody(Body::from(body))
}
}
)*};
}
impl_response_body! {
&'static str,
&'static [u8],
String,
Vec<u8>,
bytes::Bytes,
std::borrow::Cow<'static, str>,
std::borrow::Cow<'static, [u8]>,
hyper::Body,
}
impl Payload for ResponseBody {
type Data = <Body as Payload>::Data;
type Error = <Body as Payload>::Error;
#[inline]
#[cfg_attr(tarpaulin, skip)]
fn poll_data(&mut self) -> Poll<Option<Self::Data>, Self::Error> {
self.0.poll_data()
}
#[inline]
#[cfg_attr(tarpaulin, skip)]
fn poll_trailers(&mut self) -> Poll<Option<HeaderMap>, Self::Error> {
self.0.poll_trailers()
}
#[inline]
#[cfg_attr(tarpaulin, skip)]
fn is_end_stream(&self) -> bool {
self.0.is_end_stream()
}
#[inline]
#[cfg_attr(tarpaulin, skip)]
fn content_length(&self) -> Option<u64> {
self.0.content_length()
}
}
#[cfg(feature = "tower-middleware")]
mod tower {
use {super::*, tower_web::util::BufStream};
impl BufStream for ResponseBody {
type Item = hyper::Chunk;
type Error = hyper::Error;
#[inline]
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
BufStream::poll(&mut self.0)
}
fn size_hint(&self) -> tower_web::util::buf_stream::SizeHint {
self.0.size_hint()
}
}
}
pub type Output = ::http::Response<ResponseBody>;
pub trait Responder {
type Body: Into<ResponseBody>;
type Error: Into<Error>;
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error>;
}
impl<L, R> Responder for Either<L, R>
where
L: Responder,
R: Responder,
{
type Body = ResponseBody;
type Error = Error;
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
match self {
Either::Left(l) => l
.respond_to(input)
.map(|res| res.map(Into::into))
.map_err(Into::into),
Either::Right(r) => r
.respond_to(input)
.map(|res| res.map(Into::into))
.map_err(Into::into),
}
}
}
impl Responder for () {
type Body = ();
type Error = Never;
fn respond_to(self, _: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
let mut response = Response::new(());
*response.status_mut() = StatusCode::NO_CONTENT;
Ok(response)
}
}
impl<T> Responder for Option<T>
where
T: Responder,
{
type Body = ResponseBody;
type Error = Error;
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
self.ok_or_else(|| crate::error::not_found("None"))?
.respond_to(input)
.map(|response| response.map(Into::into))
.map_err(Into::into)
}
}
#[cfg_attr(feature = "cargo-clippy", allow(use_self))]
impl<T, E> Responder for Result<T, E>
where
T: Responder,
Error: From<E>,
{
type Body = ResponseBody;
type Error = Error;
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
self?
.respond_to(input)
.map(|response| response.map(Into::into))
.map_err(Into::into)
}
}
#[cfg_attr(feature = "cargo-clippy", allow(use_self))]
impl<T> Responder for Response<T>
where
T: Into<ResponseBody>,
{
type Body = T;
type Error = Never;
#[inline]
fn respond_to(self, _: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
Ok(self)
}
}
impl Responder for &'static str {
type Body = Self;
type Error = Never;
#[inline]
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
self::responder::plain(self, input)
}
}
impl Responder for String {
type Body = Self;
type Error = Never;
#[inline]
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
self::responder::plain(self, input)
}
}
impl Responder for serde_json::Value {
type Body = String;
type Error = Never;
fn respond_to(self, _: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
Ok(self::responder::make_response(
self.to_string(),
"application/json",
))
}
}
pub fn responder<F, T, E>(f: F) -> impl Responder
where
F: FnOnce(&mut Input<'_>) -> Result<Response<T>, E>,
T: Into<ResponseBody>,
E: Into<Error>,
{
#[allow(missing_debug_implementations)]
#[cfg_attr(feature = "cargo-clippy", allow(stutter))]
pub struct ResponderFn<F>(F);
impl<F, T, E> Responder for ResponderFn<F>
where
F: FnOnce(&mut Input<'_>) -> Result<Response<T>, E>,
T: Into<ResponseBody>,
E: Into<Error>,
{
type Body = T;
type Error = E;
#[inline]
fn respond_to(self, input: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
(self.0)(input)
}
}
ResponderFn(f)
}
#[inline]
pub fn json<T>(data: T) -> impl Responder
where
T: Serialize,
{
self::responder(move |input| self::responder::json(data, input))
}
#[inline]
pub fn json_pretty<T>(data: T) -> impl Responder
where
T: Serialize,
{
self::responder(move |input| self::responder::json_pretty(data, input))
}
#[inline]
pub fn html<T>(body: T) -> impl Responder
where
T: Into<ResponseBody>,
{
self::responder(move |input| self::responder::html(body, input))
}
#[allow(missing_docs)]
pub mod redirect {
use {
super::*,
http::{Response, StatusCode},
std::borrow::Cow,
};
#[derive(Debug, Clone)]
pub struct Redirect {
status: StatusCode,
location: Cow<'static, str>,
}
impl Redirect {
pub fn new<T>(status: StatusCode, location: T) -> Self
where
T: Into<Cow<'static, str>>,
{
Self {
status,
location: location.into(),
}
}
}
impl Responder for Redirect {
type Body = ();
type Error = Never;
#[inline]
fn respond_to(self, _: &mut Input<'_>) -> Result<Response<Self::Body>, Self::Error> {
Ok(Response::builder()
.status(self.status)
.header("location", &*self.location)
.body(())
.expect("should be a valid response"))
}
}
macro_rules! define_funcs {
($( $name:ident => $STATUS:ident, )*) => {$(
#[inline]
pub fn $name<T>(location: T) -> Redirect
where
T: Into<Cow<'static, str>>,
{
Redirect::new(StatusCode::$STATUS, location)
}
)*};
}
define_funcs! {
moved_permanently => MOVED_PERMANENTLY,
found => FOUND,
see_other => SEE_OTHER,
temporary_redirect => TEMPORARY_REDIRECT,
permanent_redirect => PERMANENT_REDIRECT,
to => MOVED_PERMANENTLY,
}
}
#[allow(missing_docs)]
pub mod responder {
use {
super::ResponseBody,
crate::{common::Never, error::Error, input::Input},
http::Response,
serde::Serialize,
};
#[inline]
pub fn json<T>(data: T, _: &mut Input<'_>) -> Result<Response<Vec<u8>>, Error>
where
T: Serialize,
{
serde_json::to_vec(&data)
.map(|body| self::make_response(body, "application/json"))
.map_err(crate::error::internal_server_error)
}
#[inline]
pub fn json_pretty<T>(data: T, _: &mut Input<'_>) -> Result<Response<Vec<u8>>, Error>
where
T: Serialize,
{
serde_json::to_vec_pretty(&data)
.map(|body| self::make_response(body, "application/json"))
.map_err(crate::error::internal_server_error)
}
#[inline]
pub fn html<T>(body: T, _: &mut Input<'_>) -> Result<Response<T>, Never>
where
T: Into<ResponseBody>,
{
Ok(self::make_response(body, "text/html"))
}
#[inline]
pub fn plain<T>(body: T, _: &mut Input<'_>) -> Result<Response<T>, Never>
where
T: Into<ResponseBody>,
{
Ok(self::make_response(body, "text/plain; charset=utf-8"))
}
pub(super) fn make_response<T>(body: T, content_type: &'static str) -> Response<T> {
let mut response = Response::new(body);
response.headers_mut().insert(
http::header::CONTENT_TYPE,
http::header::HeaderValue::from_static(content_type),
);
response
}
}