1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173

use std::num::ParseIntError;

use headers::{ContentType, HeaderMapExt};
use http::StatusCode;
use hyper::Body;
use serde::Serialize;

pub type Response = http::Response<Body>;

pub struct Json<T>(pub T);

pub fn json<T: Serialize>(data: T) -> Json<T> {
    Json(data)
}

pub trait IntoResponse {
    fn into_response(self) -> Response;

    fn into_json_response(self) -> Response
    where
        Self: Sized,
    {
        let mut res = self.into_response();
        let headers = res.headers_mut();
        headers.typed_insert(ContentType::json());
        res
    }

    fn into_html_response(self) -> Response
    where
        Self: Sized,
    {
        let mut res = self.into_response();
        let headers = res.headers_mut();
        headers.typed_insert(ContentType::html());
        res
    }
}

impl IntoResponse for Response {
    fn into_response(self) -> Response {
        self
    }
}

impl IntoResponse for &'static str {
    fn into_response(self) -> Response {
        let mut res = Response::new(self.into());
        let headers = res.headers_mut();
        headers.typed_insert(ContentType::html());
        res
    }
}

impl IntoResponse for String {
    fn into_response(self) -> Response {
        let mut res = Response::new(self.into());
        let headers = res.headers_mut();
        headers.typed_insert(ContentType::html());
        res
    }
}

impl IntoResponse for StatusCode {
    fn into_response(self) -> Response {
        let mut res = Response::new(Body::empty());
        *res.status_mut() = self;
        res
    }
}

impl IntoResponse for () {
    fn into_response(self) -> Response {
        Response::new(Body::empty())
    }
}

impl IntoResponse for http::Error {
    fn into_response(self) -> Response {
        StatusCode::INTERNAL_SERVER_ERROR.into_response()
    }
}

impl IntoResponse for serde_json::Error {
    fn into_response(self) -> Response {
        StatusCode::INTERNAL_SERVER_ERROR.into_response()
    }
}

impl<T> IntoResponse for Json<T>
where
    T: Serialize,
{
    fn into_response(self) -> Response {
        match serde_json::to_vec(&self.0) {
            Ok(data) => {
                let mut res = Response::new(Body::from(data));
                let headers = res.headers_mut();
                headers.typed_insert(ContentType::json());
                res
            }
            Err(err) => (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()).into_response(),
        }
    }

    fn into_json_response(self) -> Response
    where
        Self: Sized,
    {
        self.into_response()
    }

    fn into_html_response(self) -> Response
    where
        Self: Sized,
    {
        #[cfg(feature = "tracing")]
        tracing::warn!("tried to return JSON as HTML response");
        self.into_response()
    }
}

impl<T, E> IntoResponse for Result<T, E>
where
    T: IntoResponse,
    E: IntoResponse,
{
    fn into_response(self) -> Response {
        match self {
            Ok(ok) => ok.into_response(),
            Err(err) => err.into_response(),
        }
    }
}

impl IntoResponse for ParseIntError {
    fn into_response(self) -> Response {
        StatusCode::BAD_REQUEST.into_response()
    }
}

impl<B> IntoResponse for (StatusCode, B)
where
    B: Into<Body>,
{
    fn into_response(self) -> Response {
        let mut res = Response::new(self.1.into());
        *res.status_mut() = self.0;
        let headers = res.headers_mut();
        headers.typed_insert(ContentType::text_utf8());
        res
    }
}

impl IntoResponse for Body {
    fn into_response(self) -> Response {
        Response::new(self)
    }
}

#[cfg(feature = "either")]
impl<L, R> IntoResponse for either::Either<L, R>
where
    L: IntoResponse,
    R: IntoResponse,
{
    fn into_response(self) -> Response {
        match self {
            either::Either::Left(l) => l.into_response(),
            either::Either::Right(r) => r.into_response(),
        }
    }
}