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
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
//! Basic binary and string payload extractors.

use std::{
    future::Future,
    pin::Pin,
    str,
    task::{Context, Poll},
};

use actix_http::error::{ErrorBadRequest, PayloadError};
use actix_utils::future::{ready, Either, Ready};
use bytes::{Bytes, BytesMut};
use encoding_rs::{Encoding, UTF_8};
use futures_core::{ready, stream::Stream};
use mime::Mime;

use crate::{dev, http::header, web, Error, FromRequest, HttpMessage, HttpRequest};

/// Extract a request's raw payload stream.
///
/// See [`PayloadConfig`] for important notes when using this advanced extractor.
///
/// # Examples
/// ```
/// use std::future::Future;
/// use futures_util::stream::StreamExt as _;
/// use actix_web::{post, web};
///
/// // `body: web::Payload` parameter extracts raw payload stream from request
/// #[post("/")]
/// async fn index(mut body: web::Payload) -> actix_web::Result<String> {
///     // for demonstration only; in a normal case use the `Bytes` extractor
///     // collect payload stream into a bytes object
///     let mut bytes = web::BytesMut::new();
///     while let Some(item) = body.next().await {
///         bytes.extend_from_slice(&item?);
///     }
///
///     Ok(format!("Request Body Bytes:\n{:?}", bytes))
/// }
/// ```
pub struct Payload(pub crate::dev::Payload);

impl Payload {
    /// Unwrap to inner Payload type.
    pub fn into_inner(self) -> crate::dev::Payload {
        self.0
    }
}

impl Stream for Payload {
    type Item = Result<Bytes, PayloadError>;

    #[inline]
    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        Pin::new(&mut self.0).poll_next(cx)
    }
}

/// See [here](#usage) for example of usage as an extractor.
impl FromRequest for Payload {
    type Config = PayloadConfig;
    type Error = Error;
    type Future = Ready<Result<Payload, Error>>;

    #[inline]
    fn from_request(_: &HttpRequest, payload: &mut dev::Payload) -> Self::Future {
        ready(Ok(Payload(payload.take())))
    }
}

/// Extract binary data from a request's payload.
///
/// Collects request payload stream into a [Bytes] instance.
///
/// Use [`PayloadConfig`] to configure extraction process.
///
/// # Examples
/// ```
/// use actix_web::{post, web};
///
/// /// extract binary data from request
/// #[post("/")]
/// async fn index(body: web::Bytes) -> String {
///     format!("Body {:?}!", body)
/// }
/// ```
impl FromRequest for Bytes {
    type Config = PayloadConfig;
    type Error = Error;
    type Future = Either<BytesExtractFut, Ready<Result<Bytes, Error>>>;

    #[inline]
    fn from_request(req: &HttpRequest, payload: &mut dev::Payload) -> Self::Future {
        // allow both Config and Data<Config>
        let cfg = PayloadConfig::from_req(req);

        if let Err(err) = cfg.check_mimetype(req) {
            return Either::right(ready(Err(err)));
        }

        Either::left(BytesExtractFut {
            body_fut: HttpMessageBody::new(req, payload).limit(cfg.limit),
        })
    }
}

/// Future for `Bytes` extractor.
pub struct BytesExtractFut {
    body_fut: HttpMessageBody,
}

impl<'a> Future for BytesExtractFut {
    type Output = Result<Bytes, Error>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        Pin::new(&mut self.body_fut).poll(cx).map_err(Into::into)
    }
}

/// Extract text information from a request's body.
///
/// Text extractor automatically decode body according to the request's charset.
///
/// [**PayloadConfig**](PayloadConfig) allows to configure
/// extraction process.
///
/// # Examples
/// ```
/// use actix_web::{post, web, FromRequest};
///
/// // extract text data from request
/// #[post("/")]
/// async fn index(text: String) -> String {
///     format!("Body {}!", text)
/// }
impl FromRequest for String {
    type Config = PayloadConfig;
    type Error = Error;
    type Future = Either<StringExtractFut, Ready<Result<String, Error>>>;

    #[inline]
    fn from_request(req: &HttpRequest, payload: &mut dev::Payload) -> Self::Future {
        let cfg = PayloadConfig::from_req(req);

        // check content-type
        if let Err(err) = cfg.check_mimetype(req) {
            return Either::right(ready(Err(err)));
        }

        // check charset
        let encoding = match req.encoding() {
            Ok(enc) => enc,
            Err(err) => return Either::right(ready(Err(err.into()))),
        };
        let limit = cfg.limit;
        let body_fut = HttpMessageBody::new(req, payload).limit(limit);

        Either::left(StringExtractFut { body_fut, encoding })
    }
}

/// Future for `String` extractor.
pub struct StringExtractFut {
    body_fut: HttpMessageBody,
    encoding: &'static Encoding,
}

impl<'a> Future for StringExtractFut {
    type Output = Result<String, Error>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        let encoding = self.encoding;

        Pin::new(&mut self.body_fut).poll(cx).map(|out| {
            let body = out?;
            bytes_to_string(body, encoding)
        })
    }
}

fn bytes_to_string(body: Bytes, encoding: &'static Encoding) -> Result<String, Error> {
    if encoding == UTF_8 {
        Ok(str::from_utf8(body.as_ref())
            .map_err(|_| ErrorBadRequest("Can not decode body"))?
            .to_owned())
    } else {
        Ok(encoding
            .decode_without_bom_handling_and_without_replacement(&body)
            .map(|s| s.into_owned())
            .ok_or_else(|| ErrorBadRequest("Can not decode body"))?)
    }
}

/// Configuration for request payloads.
///
/// Applies to the built-in `Bytes` and `String` extractors. Note that the `Payload` extractor does
/// not automatically check conformance with this configuration to allow more flexibility when
/// building extractors on top of `Payload`.
///
/// By default, the payload size limit is 256kB and there is no mime type condition.
///
/// To use this, add an instance of it to your app or service through one of the
/// `.app_data()` methods.
#[derive(Clone)]
pub struct PayloadConfig {
    limit: usize,
    mimetype: Option<Mime>,
}

impl PayloadConfig {
    /// Create new instance with a size limit (in bytes) and no mime type condition.
    pub fn new(limit: usize) -> Self {
        Self {
            limit,
            ..Default::default()
        }
    }

    /// Set maximum accepted payload size in bytes. The default limit is 256kB.
    pub fn limit(mut self, limit: usize) -> Self {
        self.limit = limit;
        self
    }

    /// Set required mime type of the request. By default mime type is not enforced.
    pub fn mimetype(mut self, mt: Mime) -> Self {
        self.mimetype = Some(mt);
        self
    }

    fn check_mimetype(&self, req: &HttpRequest) -> Result<(), Error> {
        // check content-type
        if let Some(ref mt) = self.mimetype {
            match req.mime_type() {
                Ok(Some(ref req_mt)) => {
                    if mt != req_mt {
                        return Err(ErrorBadRequest("Unexpected Content-Type"));
                    }
                }
                Ok(None) => {
                    return Err(ErrorBadRequest("Content-Type is expected"));
                }
                Err(err) => {
                    return Err(err.into());
                }
            }
        }
        Ok(())
    }

    /// Extract payload config from app data. Check both `T` and `Data<T>`, in that order, and fall
    /// back to the default payload config if neither is found.
    fn from_req(req: &HttpRequest) -> &Self {
        req.app_data::<Self>()
            .or_else(|| req.app_data::<web::Data<Self>>().map(|d| d.as_ref()))
            .unwrap_or(&DEFAULT_CONFIG)
    }
}

/// Allow shared refs used as defaults.
const DEFAULT_CONFIG: PayloadConfig = PayloadConfig {
    limit: DEFAULT_CONFIG_LIMIT,
    mimetype: None,
};

const DEFAULT_CONFIG_LIMIT: usize = 262_144; // 2^18 bytes (~256kB)

impl Default for PayloadConfig {
    fn default() -> Self {
        DEFAULT_CONFIG.clone()
    }
}

/// Future that resolves to a complete HTTP body payload.
///
/// By default only 256kB payload is accepted before `PayloadError::Overflow` is returned.
/// Use `MessageBody::limit()` method to change upper limit.
pub struct HttpMessageBody {
    limit: usize,
    length: Option<usize>,
    #[cfg(feature = "compress")]
    stream: dev::Decompress<dev::Payload>,
    #[cfg(not(feature = "compress"))]
    stream: dev::Payload,
    buf: BytesMut,
    err: Option<PayloadError>,
}

impl HttpMessageBody {
    /// Create `MessageBody` for request.
    #[allow(clippy::borrow_interior_mutable_const)]
    pub fn new(req: &HttpRequest, payload: &mut dev::Payload) -> HttpMessageBody {
        let mut length = None;
        let mut err = None;

        if let Some(l) = req.headers().get(&header::CONTENT_LENGTH) {
            match l.to_str() {
                Ok(s) => match s.parse::<usize>() {
                    Ok(l) => {
                        if l > DEFAULT_CONFIG_LIMIT {
                            err = Some(PayloadError::Overflow);
                        }
                        length = Some(l)
                    }
                    Err(_) => err = Some(PayloadError::UnknownLength),
                },
                Err(_) => err = Some(PayloadError::UnknownLength),
            }
        }

        #[cfg(feature = "compress")]
        let stream = dev::Decompress::from_headers(payload.take(), req.headers());
        #[cfg(not(feature = "compress"))]
        let stream = payload.take();

        HttpMessageBody {
            stream,
            limit: DEFAULT_CONFIG_LIMIT,
            length,
            buf: BytesMut::with_capacity(8192),
            err,
        }
    }

    /// Change max size of payload. By default max size is 256kB
    pub fn limit(mut self, limit: usize) -> Self {
        if let Some(l) = self.length {
            self.err = if l > limit {
                Some(PayloadError::Overflow)
            } else {
                None
            };
        }
        self.limit = limit;
        self
    }
}

impl Future for HttpMessageBody {
    type Output = Result<Bytes, PayloadError>;

    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        let this = self.get_mut();

        if let Some(err) = this.err.take() {
            return Poll::Ready(Err(err));
        }

        loop {
            let res = ready!(Pin::new(&mut this.stream).poll_next(cx));
            match res {
                Some(chunk) => {
                    let chunk = chunk?;
                    if this.buf.len() + chunk.len() > this.limit {
                        return Poll::Ready(Err(PayloadError::Overflow));
                    } else {
                        this.buf.extend_from_slice(&chunk);
                    }
                }
                None => return Poll::Ready(Ok(this.buf.split().freeze())),
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use bytes::Bytes;

    use super::*;
    use crate::http::{header, StatusCode};
    use crate::test::{call_service, init_service, TestRequest};
    use crate::{web, App, Responder};

    #[actix_rt::test]
    async fn test_payload_config() {
        let req = TestRequest::default().to_http_request();
        let cfg = PayloadConfig::default().mimetype(mime::APPLICATION_JSON);
        assert!(cfg.check_mimetype(&req).is_err());

        let req = TestRequest::default()
            .insert_header((header::CONTENT_TYPE, "application/x-www-form-urlencoded"))
            .to_http_request();
        assert!(cfg.check_mimetype(&req).is_err());

        let req = TestRequest::default()
            .insert_header((header::CONTENT_TYPE, "application/json"))
            .to_http_request();
        assert!(cfg.check_mimetype(&req).is_ok());
    }

    #[actix_rt::test]
    async fn test_config_recall_locations() {
        async fn bytes_handler(_: Bytes) -> impl Responder {
            "payload is probably json bytes"
        }

        async fn string_handler(_: String) -> impl Responder {
            "payload is probably json string"
        }

        let srv = init_service(
            App::new()
                .service(
                    web::resource("/bytes-app-data")
                        .app_data(PayloadConfig::default().mimetype(mime::APPLICATION_JSON))
                        .route(web::get().to(bytes_handler)),
                )
                .service(
                    web::resource("/bytes-data")
                        .data(PayloadConfig::default().mimetype(mime::APPLICATION_JSON))
                        .route(web::get().to(bytes_handler)),
                )
                .service(
                    web::resource("/string-app-data")
                        .app_data(PayloadConfig::default().mimetype(mime::APPLICATION_JSON))
                        .route(web::get().to(string_handler)),
                )
                .service(
                    web::resource("/string-data")
                        .data(PayloadConfig::default().mimetype(mime::APPLICATION_JSON))
                        .route(web::get().to(string_handler)),
                ),
        )
        .await;

        let req = TestRequest::with_uri("/bytes-app-data").to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);

        let req = TestRequest::with_uri("/bytes-data").to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);

        let req = TestRequest::with_uri("/string-app-data").to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);

        let req = TestRequest::with_uri("/string-data").to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);

        let req = TestRequest::with_uri("/bytes-app-data")
            .insert_header(header::ContentType(mime::APPLICATION_JSON))
            .to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::OK);

        let req = TestRequest::with_uri("/bytes-data")
            .insert_header(header::ContentType(mime::APPLICATION_JSON))
            .to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::OK);

        let req = TestRequest::with_uri("/string-app-data")
            .insert_header(header::ContentType(mime::APPLICATION_JSON))
            .to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::OK);

        let req = TestRequest::with_uri("/string-data")
            .insert_header(header::ContentType(mime::APPLICATION_JSON))
            .to_request();
        let resp = call_service(&srv, req).await;
        assert_eq!(resp.status(), StatusCode::OK);
    }

    #[actix_rt::test]
    async fn test_bytes() {
        let (req, mut pl) = TestRequest::default()
            .insert_header((header::CONTENT_LENGTH, "11"))
            .set_payload(Bytes::from_static(b"hello=world"))
            .to_http_parts();

        let s = Bytes::from_request(&req, &mut pl).await.unwrap();
        assert_eq!(s, Bytes::from_static(b"hello=world"));
    }

    #[actix_rt::test]
    async fn test_string() {
        let (req, mut pl) = TestRequest::default()
            .insert_header((header::CONTENT_LENGTH, "11"))
            .set_payload(Bytes::from_static(b"hello=world"))
            .to_http_parts();

        let s = String::from_request(&req, &mut pl).await.unwrap();
        assert_eq!(s, "hello=world");
    }

    #[actix_rt::test]
    async fn test_message_body() {
        let (req, mut pl) = TestRequest::default()
            .insert_header((header::CONTENT_LENGTH, "xxxx"))
            .to_srv_request()
            .into_parts();
        let res = HttpMessageBody::new(&req, &mut pl).await;
        match res.err().unwrap() {
            PayloadError::UnknownLength => {}
            _ => unreachable!("error"),
        }

        let (req, mut pl) = TestRequest::default()
            .insert_header((header::CONTENT_LENGTH, "1000000"))
            .to_srv_request()
            .into_parts();
        let res = HttpMessageBody::new(&req, &mut pl).await;
        match res.err().unwrap() {
            PayloadError::Overflow => {}
            _ => unreachable!("error"),
        }

        let (req, mut pl) = TestRequest::default()
            .set_payload(Bytes::from_static(b"test"))
            .to_http_parts();
        let res = HttpMessageBody::new(&req, &mut pl).await;
        assert_eq!(res.ok().unwrap(), Bytes::from_static(b"test"));

        let (req, mut pl) = TestRequest::default()
            .set_payload(Bytes::from_static(b"11111111111111"))
            .to_http_parts();
        let res = HttpMessageBody::new(&req, &mut pl).limit(5).await;
        match res.err().unwrap() {
            PayloadError::Overflow => {}
            _ => unreachable!("error"),
        }
    }
}