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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
//! For path segment extractor documentation, see [`Path`].

use std::sync::Arc;

use actix_router::PathDeserializer;
use actix_utils::future::{ready, Ready};
use derive_more::{AsRef, Deref, DerefMut, Display, From};
use serde::de;

use crate::{
    dev::Payload,
    error::{Error, ErrorNotFound, PathError},
    web::Data,
    FromRequest, HttpRequest,
};

/// Extract typed data from request path segments.
///
/// Use [`PathConfig`] to configure extraction option.
///
/// Unlike, [`HttpRequest::match_info`], this extractor will fully percent-decode dynamic segments,
/// including `/`, `%`, and `+`.
///
/// # Examples
/// ```
/// use actix_web::{get, web};
///
/// // extract path info from "/{name}/{count}/index.html" into tuple
/// // {name}  - deserialize a String
/// // {count} - deserialize a u32
/// #[get("/{name}/{count}/index.html")]
/// async fn index(path: web::Path<(String, u32)>) -> String {
///     let (name, count) = path.into_inner();
///     format!("Welcome {}! {}", name, count)
/// }
/// ```
///
/// Path segments also can be deserialized into any type that implements [`serde::Deserialize`].
/// Path segment labels will be matched with struct field names.
///
/// ```
/// use actix_web::{get, web};
/// use serde::Deserialize;
///
/// #[derive(Deserialize)]
/// struct Info {
///     name: String,
/// }
///
/// // extract `Info` from a path using serde
/// #[get("/{name}")]
/// async fn index(info: web::Path<Info>) -> String {
///     format!("Welcome {}!", info.name)
/// }
/// ```
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Deref, DerefMut, AsRef, Display, From)]
pub struct Path<T>(T);

impl<T> Path<T> {
    /// Unwrap into inner `T` value.
    pub fn into_inner(self) -> T {
        self.0
    }
}

/// See [here](#Examples) for example of usage as an extractor.
impl<T> FromRequest for Path<T>
where
    T: de::DeserializeOwned,
{
    type Error = Error;
    type Future = Ready<Result<Self, Self::Error>>;

    #[inline]
    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
        let error_handler = req
            .app_data::<PathConfig>()
            .or_else(|| req.app_data::<Data<PathConfig>>().map(Data::get_ref))
            .and_then(|c| c.err_handler.clone());

        ready(
            de::Deserialize::deserialize(PathDeserializer::new(req.match_info()))
                .map(Path)
                .map_err(move |err| {
                    log::debug!(
                        "Failed during Path extractor deserialization. \
                         Request path: {:?}",
                        req.path()
                    );

                    if let Some(error_handler) = error_handler {
                        let e = PathError::Deserialize(err);
                        (error_handler)(e, req)
                    } else {
                        ErrorNotFound(err)
                    }
                }),
        )
    }
}

/// Path extractor configuration
///
/// ```
/// use actix_web::web::PathConfig;
/// use actix_web::{error, web, App, FromRequest, HttpResponse};
/// use serde::Deserialize;
///
/// #[derive(Deserialize, Debug)]
/// enum Folder {
///     #[serde(rename = "inbox")]
///     Inbox,
///
///     #[serde(rename = "outbox")]
///     Outbox,
/// }
///
/// // deserialize `Info` from request's path
/// async fn index(folder: web::Path<Folder>) -> String {
///     format!("Selected folder: {:?}!", folder)
/// }
///
/// let app = App::new().service(
///     web::resource("/messages/{folder}")
///         .app_data(PathConfig::default().error_handler(|err, req| {
///             error::InternalError::from_response(
///                 err,
///                 HttpResponse::Conflict().into(),
///             )
///             .into()
///         }))
///         .route(web::post().to(index)),
/// );
/// ```
#[derive(Clone, Default)]
pub struct PathConfig {
    #[allow(clippy::type_complexity)]
    err_handler: Option<Arc<dyn Fn(PathError, &HttpRequest) -> Error + Send + Sync>>,
}

impl PathConfig {
    /// Set custom error handler.
    pub fn error_handler<F>(mut self, f: F) -> Self
    where
        F: Fn(PathError, &HttpRequest) -> Error + Send + Sync + 'static,
    {
        self.err_handler = Some(Arc::new(f));
        self
    }
}

#[cfg(test)]
mod tests {
    use actix_router::ResourceDef;
    use derive_more::Display;
    use serde::Deserialize;

    use super::*;
    use crate::test::TestRequest;
    use crate::{error, http, HttpResponse};

    #[derive(Deserialize, Debug, Display)]
    #[display(fmt = "MyStruct({}, {})", key, value)]
    struct MyStruct {
        key: String,
        value: String,
    }

    #[derive(Deserialize)]
    struct Test2 {
        key: String,
        value: u32,
    }

    #[actix_rt::test]
    async fn test_extract_path_single() {
        let resource = ResourceDef::new("/{value}/");

        let mut req = TestRequest::with_uri("/32/").to_srv_request();
        resource.capture_match_info(req.match_info_mut());

        let (req, mut pl) = req.into_parts();
        assert_eq!(*Path::<i8>::from_request(&req, &mut pl).await.unwrap(), 32);
        assert!(Path::<MyStruct>::from_request(&req, &mut pl).await.is_err());
    }

    #[allow(clippy::let_unit_value)]
    #[actix_rt::test]
    async fn test_tuple_extract() {
        let resource = ResourceDef::new("/{key}/{value}/");

        let mut req = TestRequest::with_uri("/name/user1/?id=test").to_srv_request();
        resource.capture_match_info(req.match_info_mut());

        let (req, mut pl) = req.into_parts();
        let (Path(res),) = <(Path<(String, String)>,)>::from_request(&req, &mut pl)
            .await
            .unwrap();
        assert_eq!(res.0, "name");
        assert_eq!(res.1, "user1");

        let (Path(a), Path(b)) =
            <(Path<(String, String)>, Path<(String, String)>)>::from_request(&req, &mut pl)
                .await
                .unwrap();
        assert_eq!(a.0, "name");
        assert_eq!(a.1, "user1");
        assert_eq!(b.0, "name");
        assert_eq!(b.1, "user1");

        let () = <()>::from_request(&req, &mut pl).await.unwrap();
    }

    #[actix_rt::test]
    async fn test_request_extract() {
        let mut req = TestRequest::with_uri("/name/user1/?id=test").to_srv_request();

        let resource = ResourceDef::new("/{key}/{value}/");
        resource.capture_match_info(req.match_info_mut());

        let (req, mut pl) = req.into_parts();
        let mut s = Path::<MyStruct>::from_request(&req, &mut pl).await.unwrap();
        assert_eq!(s.key, "name");
        assert_eq!(s.value, "user1");
        s.value = "user2".to_string();
        assert_eq!(s.value, "user2");
        assert_eq!(
            format!("{}, {:?}", s, s),
            "MyStruct(name, user2), Path(MyStruct { key: \"name\", value: \"user2\" })"
        );
        let s = s.into_inner();
        assert_eq!(s.value, "user2");

        let Path(s) = Path::<(String, String)>::from_request(&req, &mut pl)
            .await
            .unwrap();
        assert_eq!(s.0, "name");
        assert_eq!(s.1, "user1");

        let mut req = TestRequest::with_uri("/name/32/").to_srv_request();
        let resource = ResourceDef::new("/{key}/{value}/");
        resource.capture_match_info(req.match_info_mut());

        let (req, mut pl) = req.into_parts();
        let s = Path::<Test2>::from_request(&req, &mut pl).await.unwrap();
        assert_eq!(s.as_ref().key, "name");
        assert_eq!(s.value, 32);

        let Path(s) = Path::<(String, u8)>::from_request(&req, &mut pl)
            .await
            .unwrap();
        assert_eq!(s.0, "name");
        assert_eq!(s.1, 32);

        let res = Path::<Vec<String>>::from_request(&req, &mut pl)
            .await
            .unwrap();
        assert_eq!(res[0], "name".to_owned());
        assert_eq!(res[1], "32".to_owned());
    }

    #[actix_rt::test]
    async fn paths_decoded() {
        let resource = ResourceDef::new("/{key}/{value}");
        let mut req = TestRequest::with_uri("/na%2Bme/us%2Fer%254%32").to_srv_request();
        resource.capture_match_info(req.match_info_mut());

        let (req, mut pl) = req.into_parts();
        let path_items = Path::<MyStruct>::from_request(&req, &mut pl).await.unwrap();
        assert_eq!(path_items.key, "na+me");
        assert_eq!(path_items.value, "us/er%42");
        assert_eq!(req.match_info().as_str(), "/na%2Bme/us%2Fer%2542");
    }

    #[actix_rt::test]
    async fn test_custom_err_handler() {
        let (req, mut pl) = TestRequest::with_uri("/name/user1/")
            .app_data(PathConfig::default().error_handler(|err, _| {
                error::InternalError::from_response(err, HttpResponse::Conflict().finish())
                    .into()
            }))
            .to_http_parts();

        let s = Path::<(usize,)>::from_request(&req, &mut pl)
            .await
            .unwrap_err();
        let res = HttpResponse::from_error(s);

        assert_eq!(res.status(), http::StatusCode::CONFLICT);
    }
}