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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192

use http::{HeaderMap, Method, Uri, Version};
use http_service::Body;
use route_recognizer::Params;
use serde::Deserialize;

use async_std::io::{self, prelude::*};
use async_std::task::{Context, Poll};

use std::pin::Pin;
use std::{str::FromStr, sync::Arc};

pin_project_lite::pin_project! {
    /// An HTTP request.
    ///
    /// The `Request` gives endpoints access to basic information about the incoming
    /// request, route parameters, and various ways of accessing the request's body.
    ///
    /// Requests also provide *extensions*, a type map primarily used for low-level
    /// communication between middleware and endpoints.
    #[derive(Debug)]
    pub struct Request<State> {
        state: Arc<State>,
        #[pin]
        request: http_service::Request,
        route_params: Params,
    }
}

impl<State> Request<State> {
    pub(crate) fn new(
        state: Arc<State>,
        request: http::Request<Body>,
        route_params: Params,
    ) -> Request<State> {
        Request {
            state,
            request,
            route_params,
        }
    }

    /// Access the request's HTTP method.
    pub fn method(&self) -> &Method {
        self.request.method()
    }

    /// Access the request's full URI method.
    pub fn uri(&self) -> &Uri {
        self.request.uri()
    }

    /// Access the request's HTTP version.
    pub fn version(&self) -> Version {
        self.request.version()
    }

    /// Access the request's headers.
    pub fn headers(&self) -> &HeaderMap {
        self.request.headers()
    }

    /// Get an HTTP header.
    pub fn header(&self, key: &'static str) -> Option<&'_ str> {
        self.request.headers().get(key).map(|h| h.to_str().unwrap())
    }

    /// Set an HTTP header.
    pub fn set_header(mut self, key: &'static str, value: impl AsRef<str>) -> Self {
        let value = value.as_ref().to_owned();
        self.request
            .headers_mut()
            .insert(key, value.parse().unwrap());
        self
    }

    /// Get a local value.
    pub fn local<T: Send + Sync + 'static>(&self) -> Option<&T> {
        self.request.extensions().get()
    }

    /// Set a local value.
    pub fn set_local<T: Send + Sync + 'static>(mut self, val: T) -> Self {
        self.request.extensions_mut().insert(val);
        self
    }

    ///  Access app-global state.
    pub fn state(&self) -> &State {
        &self.state
    }

    /// Extract and parse a route parameter by name.
    ///
    /// Returns the results of parsing the parameter according to the inferred
    /// output type `T`.
    ///
    /// The name should *not* include the leading `:` or the trailing `*` (if
    /// any).
    ///
    /// # Errors
    ///
    /// Yields an `Err` if the parameter was found but failed to parse as an
    /// instance of type `T`.
    ///
    /// # Panics
    ///
    /// Panic if `key` is not a parameter for the route.
    pub fn param<T: FromStr>(&self, key: &str) -> Result<T, T::Err> {
        self.route_params.find(key).unwrap().parse()
    }

    /// Reads the entire request body into a byte buffer.
    ///
    /// This method can be called after the body has already been read, but will
    /// produce an empty buffer.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    pub async fn body_bytes(&mut self) -> std::io::Result<Vec<u8>> {
        let mut buf = Vec::with_capacity(1024);
        self.request.body_mut().read_to_end(&mut buf).await?;
        Ok(buf)
    }

    /// Reads the entire request body into a string.
    ///
    /// This method can be called after the body has already been read, but will
    /// produce an empty buffer.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    ///
    /// If the body cannot be interpreted as valid UTF-8, an `Err` is returned.
    pub async fn body_string(&mut self) -> std::io::Result<String> {
        let body_bytes = self.body_bytes().await?;
        Ok(String::from_utf8(body_bytes).map_err(|_| std::io::ErrorKind::InvalidData)?)
    }

    /// Reads and deserialized the entire request body via json.
    ///
    /// # Errors
    ///
    /// Any I/O error encountered while reading the body is immediately returned
    /// as an `Err`.
    ///
    /// If the body cannot be interpreted as valid json for the target type `T`,
    /// an `Err` is returned.
    pub async fn body_json<T: serde::de::DeserializeOwned>(&mut self) -> std::io::Result<T> {
        let body_bytes = self.body_bytes().await?;
        Ok(serde_json::from_slice(&body_bytes).map_err(|_| std::io::ErrorKind::InvalidData)?)
    }

    /// Get the URL querystring.
    pub fn query<'de, T: Deserialize<'de>>(&'de self) -> Result<T, crate::Error> {
        let query = self.uri().query();
        if query.is_none() {
            return Err(crate::Error::from(http::StatusCode::BAD_REQUEST));
        }
        Ok(serde_qs::from_str(query.unwrap())
            .map_err(|_| crate::Error::from(http::StatusCode::BAD_REQUEST))?)
    }

    /// Parse the request body as a form.
    pub async fn body_form<T: serde::de::DeserializeOwned>(&mut self) -> io::Result<T> {
        let body = self
            .body_bytes()
            .await
            .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))?;
        let res = serde_qs::from_bytes(&body).map_err(|e| {
            std::io::Error::new(
                std::io::ErrorKind::Other,
                format!("could not decode form: {}", e),
            )
        })?;
        Ok(res)
    }
}

impl<State> Read for Request<State> {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<io::Result<usize>> {
        let mut this = self.project();
        Pin::new(this.request.body_mut()).poll_read(cx, buf)
    }
}