xitca_web/handler/types/
text.rs

1//! type extractor, responder and service for text
2
3use core::convert::Infallible;
4
5use crate::{
6    body::{BodyStream, ResponseBody},
7    context::WebContext,
8    error::{Error, forward_blank_bad_request},
9    handler::{FromRequest, Responder},
10    http::{WebResponse, const_header_value::TEXT_UTF8, header::CONTENT_TYPE},
11    service::Service,
12};
13
14impl<'a, 'r, C, B> FromRequest<'a, WebContext<'r, C, B>> for String
15where
16    B: BodyStream + Default,
17{
18    type Type<'b> = String;
19    type Error = Error;
20
21    #[inline]
22    async fn from_request(ctx: &'a WebContext<'r, C, B>) -> Result<Self, Self::Error> {
23        let vec = Vec::from_request(ctx).await?;
24        String::from_utf8(vec).map_err(Error::from_service)
25    }
26}
27
28forward_blank_bad_request!(std::string::FromUtf8Error);
29
30macro_rules! text_utf8 {
31    ($type: ty) => {
32        impl<'r, C, B> Responder<WebContext<'r, C, B>> for $type {
33            type Response = WebResponse;
34            type Error = Error;
35
36            #[inline]
37            async fn respond(self, ctx: WebContext<'r, C, B>) -> Result<Self::Response, Self::Error> {
38                Text(self).respond(ctx).await
39            }
40
41            #[inline]
42            fn map(self, res: Self::Response) -> Result<Self::Response, Self::Error> {
43                Responder::<WebContext<'r, C, B>>::map(Text(self), res)
44            }
45        }
46    };
47}
48
49text_utf8!(&'static str);
50text_utf8!(String);
51text_utf8!(Box<str>);
52text_utf8!(std::borrow::Cow<'static, str>);
53
54/// text responder and service type that would extend [`CONTENT_TYPE`] header with [`TEXT_UTF8`] value to [`WebResponse`].
55#[derive(Clone)]
56pub struct Text<T>(pub T);
57
58impl<'r, C, B, T> Responder<WebContext<'r, C, B>> for Text<T>
59where
60    T: Into<ResponseBody>,
61{
62    type Response = WebResponse;
63    type Error = Error;
64
65    async fn respond(self, ctx: WebContext<'r, C, B>) -> Result<Self::Response, Self::Error> {
66        let mut res = ctx.into_response(self.0.into());
67        res.headers_mut().insert(CONTENT_TYPE, TEXT_UTF8);
68        Ok(res)
69    }
70
71    fn map(self, res: Self::Response) -> Result<Self::Response, Self::Error> {
72        let mut res = res.map(|_| self.0.into());
73        res.headers_mut().insert(CONTENT_TYPE, TEXT_UTF8);
74        Ok(res)
75    }
76}
77
78impl<T> Service for Text<T>
79where
80    T: Clone,
81{
82    type Response = Self;
83    type Error = Infallible;
84
85    async fn call(&self, _: ()) -> Result<Self::Response, Self::Error> {
86        Ok(self.clone())
87    }
88}
89
90impl<'r, C, B, T> Service<WebContext<'r, C, B>> for Text<T>
91where
92    T: Into<ResponseBody> + Clone,
93{
94    type Response = WebResponse;
95    type Error = Error;
96
97    #[inline]
98    async fn call(&self, ctx: WebContext<'r, C, B>) -> Result<Self::Response, Self::Error> {
99        self.clone().respond(ctx).await
100    }
101}
xitca_web/handler/types/text.rs

xitca_web/handler/types/
text.rs
