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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
//! Rejections
//!
//! Part of the power of the [`Filter`](../trait.Filter.html) system is being able to
//! reject a request from a filter chain. This allows for filters to be
//! combined with `or`, so that if one side of the chain finds that a request
//! doesn't fulfill its requirements, the other side can try to process
//! the request.
//!
//! Many of the built-in [`filters`](../filters) will automatically reject
//! the request with an appropriate rejection. However, you can also build
//! new custom [`Filter`](../trait.Filter.html)s and still want other routes to be
//! matchable in the case a predicate doesn't hold.
//!
//! As a request is processed by a Filter chain, the rejections are accumulated into
//! a list contained by the [`Rejection`](struct.Rejection.html) type. Rejections from
//! filters can be handled using [`Filter::recover`](../trait.Filter.html#method.recover).
//! This is a convenient way to map rejections into a [`Reply`](../reply/trait.Reply.html).
//!
//! For a more complete example see the
//! [Rejection Example](https://github.com/seanmonstar/warp/blob/master/examples/rejections.rs)
//! from the repository.
//!
//! # Example
//!
//! ```
//! use warp::{reply, Reply, Filter, reject, Rejection, http::StatusCode};
//!
//! #[derive(Debug)]
//! struct InvalidParameter;
//!
//! impl reject::Reject for InvalidParameter {}
//!
//! // Custom rejection handler that maps rejections into responses.
//! async fn handle_rejection(err: Rejection) -> Result<impl Reply, std::convert::Infallible> {
//! if err.is_not_found() {
//! Ok(reply::with_status("NOT_FOUND", StatusCode::NOT_FOUND))
//! } else if let Some(e) = err.find::<InvalidParameter>() {
//! Ok(reply::with_status("BAD_REQUEST", StatusCode::BAD_REQUEST))
//! } else {
//! eprintln!("unhandled rejection: {:?}", err);
//! Ok(reply::with_status("INTERNAL_SERVER_ERROR", StatusCode::INTERNAL_SERVER_ERROR))
//! }
//! }
//!
//!
//! // Filter on `/:id`, but reject with InvalidParameter if the `id` is `0`.
//! // Recover from this rejection using a custom rejection handler.
//! let route = warp::path::param()
//! .and_then(|id: u32| async move {
//! if id == 0 {
//! Err(warp::reject::custom(InvalidParameter))
//! } else {
//! Ok("id is valid")
//! }
//! })
//! .recover(handle_rejection);
//! ```
use std::any::Any;
use std::convert::Infallible;
use std::error::Error as StdError;
use std::fmt;
use http::{
header::{HeaderValue, CONTENT_TYPE},
StatusCode,
};
use hyper::Body;
pub(crate) use self::sealed::{CombineRejection, IsReject};
/// Rejects a request with `404 Not Found`.
#[inline]
pub fn reject() -> Rejection {
not_found()
}
/// Rejects a request with `404 Not Found`.
#[inline]
pub fn not_found() -> Rejection {
Rejection {
reason: Reason::NotFound,
}
}
// 400 Bad Request
#[inline]
pub(crate) fn invalid_query() -> Rejection {
known(InvalidQuery { _p: () })
}
// 400 Bad Request
#[inline]
pub(crate) fn missing_header(name: &'static str) -> Rejection {
known(MissingHeader { name })
}
// 400 Bad Request
#[inline]
pub(crate) fn invalid_header(name: &'static str) -> Rejection {
known(InvalidHeader { name })
}
// 400 Bad Request
#[inline]
pub(crate) fn missing_cookie(name: &'static str) -> Rejection {
known(MissingCookie { name })
}
// 405 Method Not Allowed
#[inline]
pub(crate) fn method_not_allowed() -> Rejection {
known(MethodNotAllowed { _p: () })
}
// 411 Length Required
#[inline]
pub(crate) fn length_required() -> Rejection {
known(LengthRequired { _p: () })
}
// 413 Payload Too Large
#[inline]
pub(crate) fn payload_too_large() -> Rejection {
known(PayloadTooLarge { _p: () })
}
// 415 Unsupported Media Type
//
// Used by the body filters if the request payload content-type doesn't match
// what can be deserialized.
#[inline]
pub(crate) fn unsupported_media_type() -> Rejection {
known(UnsupportedMediaType { _p: () })
}
/// Rejects a request with a custom cause.
///
/// A [`recover`][] filter should convert this `Rejection` into a `Reply`,
/// or else this will be returned as a `500 Internal Server Error`.
///
/// [`recover`]: ../trait.Filter.html#method.recover
pub fn custom<T: Reject>(err: T) -> Rejection {
Rejection::custom(Box::new(err))
}
/// Protect against re-rejecting a rejection.
///
/// ```compile_fail
/// fn with(r: warp::Rejection) {
/// let _wat = warp::reject::custom(r);
/// }
/// ```
fn __reject_custom_compilefail() {}
/// A marker trait to ensure proper types are used for custom rejections.
///
/// Can be converted into Rejection.
///
/// # Example
///
/// ```
/// use warp::{Filter, reject::Reject};
///
/// #[derive(Debug)]
/// struct RateLimited;
///
/// impl Reject for RateLimited {}
///
/// let route = warp::any().and_then(|| async {
/// Err::<(), _>(warp::reject::custom(RateLimited))
/// });
/// ```
// Require `Sized` for now to prevent passing a `Box<dyn Reject>`, since we
// would be double-boxing it, and the downcasting wouldn't work as expected.
pub trait Reject: fmt::Debug + Sized + Send + Sync + 'static {}
trait Cause: fmt::Debug + Send + Sync + 'static {
fn as_any(&self) -> &dyn Any;
}
impl<T> Cause for T
where
T: fmt::Debug + Send + Sync + 'static,
{
fn as_any(&self) -> &dyn Any {
self
}
}
impl dyn Cause {
fn downcast_ref<T: Any>(&self) -> Option<&T> {
self.as_any().downcast_ref::<T>()
}
}
pub(crate) fn known<T: Into<Known>>(err: T) -> Rejection {
Rejection::known(err.into())
}
/// Rejection of a request by a [`Filter`](crate::Filter).
///
/// See the [`reject`](module@crate::reject) documentation for more.
pub struct Rejection {
reason: Reason,
}
enum Reason {
NotFound,
Other(Box<Rejections>),
}
enum Rejections {
Known(Known),
Custom(Box<dyn Cause>),
Combined(Box<Rejections>, Box<Rejections>),
}
macro_rules! enum_known {
($($(#[$attr:meta])* $var:ident($ty:path),)+) => (
pub(crate) enum Known {
$(
$(#[$attr])*
$var($ty),
)+
}
impl Known {
fn inner_as_any(&self) -> &dyn Any {
match *self {
$(
$(#[$attr])*
Known::$var(ref t) => t,
)+
}
}
}
impl fmt::Debug for Known {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
$(
$(#[$attr])*
Known::$var(ref t) => t.fmt(f),
)+
}
}
}
impl fmt::Display for Known {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
$(
$(#[$attr])*
Known::$var(ref t) => t.fmt(f),
)+
}
}
}
$(
#[doc(hidden)]
$(#[$attr])*
impl From<$ty> for Known {
fn from(ty: $ty) -> Known {
Known::$var(ty)
}
}
)+
);
}
enum_known! {
MethodNotAllowed(MethodNotAllowed),
InvalidHeader(InvalidHeader),
MissingHeader(MissingHeader),
MissingCookie(MissingCookie),
InvalidQuery(InvalidQuery),
LengthRequired(LengthRequired),
PayloadTooLarge(PayloadTooLarge),
UnsupportedMediaType(UnsupportedMediaType),
FileOpenError(crate::fs::FileOpenError),
FilePermissionError(crate::fs::FilePermissionError),
BodyReadError(crate::body::BodyReadError),
BodyDeserializeError(crate::body::BodyDeserializeError),
CorsForbidden(crate::cors::CorsForbidden),
#[cfg(feature = "websocket")]
MissingConnectionUpgrade(crate::ws::MissingConnectionUpgrade),
MissingExtension(crate::ext::MissingExtension),
BodyConsumedMultipleTimes(crate::body::BodyConsumedMultipleTimes),
}
impl Rejection {
fn known(known: Known) -> Self {
Rejection {
reason: Reason::Other(Box::new(Rejections::Known(known))),
}
}
fn custom(other: Box<dyn Cause>) -> Self {
Rejection {
reason: Reason::Other(Box::new(Rejections::Custom(other))),
}
}
/// Searches this `Rejection` for a specific cause.
///
/// A `Rejection` will accumulate causes over a `Filter` chain. This method
/// can search through them and return the first cause of this type.
///
/// # Example
///
/// ```
/// #[derive(Debug)]
/// struct Nope;
///
/// impl warp::reject::Reject for Nope {}
///
/// let reject = warp::reject::custom(Nope);
///
/// if let Some(nope) = reject.find::<Nope>() {
/// println!("found it: {:?}", nope);
/// }
/// ```
pub fn find<T: 'static>(&self) -> Option<&T> {
if let Reason::Other(ref rejections) = self.reason {
return rejections.find();
}
None
}
/// Returns true if this Rejection was made via `warp::reject::not_found`.
///
/// # Example
///
/// ```
/// let rejection = warp::reject();
///
/// assert!(rejection.is_not_found());
/// ```
pub fn is_not_found(&self) -> bool {
matches!(self.reason, Reason::NotFound)
}
}
impl<T: Reject> From<T> for Rejection {
#[inline]
fn from(err: T) -> Rejection {
custom(err)
}
}
impl From<Infallible> for Rejection {
#[inline]
fn from(infallible: Infallible) -> Rejection {
match infallible {}
}
}
impl IsReject for Infallible {
fn status(&self) -> StatusCode {
match *self {}
}
fn into_response(&self) -> crate::reply::Response {
match *self {}
}
}
impl IsReject for Rejection {
fn status(&self) -> StatusCode {
match self.reason {
Reason::NotFound => StatusCode::NOT_FOUND,
Reason::Other(ref other) => other.status(),
}
}
fn into_response(&self) -> crate::reply::Response {
match self.reason {
Reason::NotFound => {
let mut res = http::Response::default();
*res.status_mut() = StatusCode::NOT_FOUND;
res
}
Reason::Other(ref other) => other.into_response(),
}
}
}
impl fmt::Debug for Rejection {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("Rejection").field(&self.reason).finish()
}
}
impl fmt::Debug for Reason {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self {
Reason::NotFound => f.write_str("NotFound"),
Reason::Other(ref other) => match **other {
Rejections::Known(ref e) => fmt::Debug::fmt(e, f),
Rejections::Custom(ref e) => fmt::Debug::fmt(e, f),
Rejections::Combined(ref a, ref b) => {
let mut list = f.debug_list();
a.debug_list(&mut list);
b.debug_list(&mut list);
list.finish()
}
},
}
}
}
// ===== Rejections =====
impl Rejections {
fn status(&self) -> StatusCode {
match *self {
Rejections::Known(ref k) => match *k {
Known::MethodNotAllowed(_) => StatusCode::METHOD_NOT_ALLOWED,
Known::InvalidHeader(_)
| Known::MissingHeader(_)
| Known::MissingCookie(_)
| Known::InvalidQuery(_)
| Known::BodyReadError(_)
| Known::BodyDeserializeError(_) => StatusCode::BAD_REQUEST,
#[cfg(feature = "websocket")]
Known::MissingConnectionUpgrade(_) => StatusCode::BAD_REQUEST,
Known::LengthRequired(_) => StatusCode::LENGTH_REQUIRED,
Known::PayloadTooLarge(_) => StatusCode::PAYLOAD_TOO_LARGE,
Known::UnsupportedMediaType(_) => StatusCode::UNSUPPORTED_MEDIA_TYPE,
Known::FilePermissionError(_) | Known::CorsForbidden(_) => StatusCode::FORBIDDEN,
Known::FileOpenError(_)
| Known::MissingExtension(_)
| Known::BodyConsumedMultipleTimes(_) => StatusCode::INTERNAL_SERVER_ERROR,
},
Rejections::Custom(..) => StatusCode::INTERNAL_SERVER_ERROR,
Rejections::Combined(..) => self.preferred().status(),
}
}
fn into_response(&self) -> crate::reply::Response {
match *self {
Rejections::Known(ref e) => {
let mut res = http::Response::new(Body::from(e.to_string()));
*res.status_mut() = self.status();
res.headers_mut().insert(
CONTENT_TYPE,
HeaderValue::from_static("text/plain; charset=utf-8"),
);
res
}
Rejections::Custom(ref e) => {
tracing::error!(
"unhandled custom rejection, returning 500 response: {:?}",
e
);
let body = format!("Unhandled rejection: {:?}", e);
let mut res = http::Response::new(Body::from(body));
*res.status_mut() = self.status();
res.headers_mut().insert(
CONTENT_TYPE,
HeaderValue::from_static("text/plain; charset=utf-8"),
);
res
}
Rejections::Combined(..) => self.preferred().into_response(),
}
}
fn find<T: 'static>(&self) -> Option<&T> {
match *self {
Rejections::Known(ref e) => e.inner_as_any().downcast_ref(),
Rejections::Custom(ref e) => e.downcast_ref(),
Rejections::Combined(ref a, ref b) => a.find().or_else(|| b.find()),
}
}
fn debug_list(&self, f: &mut fmt::DebugList<'_, '_>) {
match *self {
Rejections::Known(ref e) => {
f.entry(e);
}
Rejections::Custom(ref e) => {
f.entry(e);
}
Rejections::Combined(ref a, ref b) => {
a.debug_list(f);
b.debug_list(f);
}
}
}
fn preferred(&self) -> &Rejections {
match self {
Rejections::Known(_) | Rejections::Custom(_) => self,
Rejections::Combined(a, b) => {
let a = a.preferred();
let b = b.preferred();
// Now both a and b are known or custom, so it is safe
// to get status
// Compare status codes, with this priority:
// - NOT_FOUND is lowest
// - METHOD_NOT_ALLOWED is second
// - if one status code is greater than the other
// - otherwise, prefer A...
match (a.status(), b.status()) {
(_, StatusCode::NOT_FOUND) => a,
(StatusCode::NOT_FOUND, _) => b,
(_, StatusCode::METHOD_NOT_ALLOWED) => a,
(StatusCode::METHOD_NOT_ALLOWED, _) => b,
(sa, sb) if sa < sb => b,
_ => a,
}
}
}
}
}
unit_error! {
/// Invalid query
pub InvalidQuery: "Invalid query string"
}
unit_error! {
/// HTTP method not allowed
pub MethodNotAllowed: "HTTP method not allowed"
}
unit_error! {
/// A content-length header is required
pub LengthRequired: "A content-length header is required"
}
unit_error! {
/// The request payload is too large
pub PayloadTooLarge: "The request payload is too large"
}
unit_error! {
/// The request's content-type is not supported
pub UnsupportedMediaType: "The request's content-type is not supported"
}
/// Missing request header
#[derive(Debug)]
pub struct MissingHeader {
name: &'static str,
}
impl MissingHeader {
/// Retrieve the name of the header that was missing
pub fn name(&self) -> &str {
self.name
}
}
impl fmt::Display for MissingHeader {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Missing request header {:?}", self.name)
}
}
impl StdError for MissingHeader {}
/// Invalid request header
#[derive(Debug)]
pub struct InvalidHeader {
name: &'static str,
}
impl InvalidHeader {
/// Retrieve the name of the header that was invalid
pub fn name(&self) -> &str {
self.name
}
}
impl fmt::Display for InvalidHeader {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Invalid request header {:?}", self.name)
}
}
impl StdError for InvalidHeader {}
/// Missing cookie
#[derive(Debug)]
pub struct MissingCookie {
name: &'static str,
}
impl MissingCookie {
/// Retrieve the name of the cookie that was missing
pub fn name(&self) -> &str {
self.name
}
}
impl fmt::Display for MissingCookie {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Missing request cookie {:?}", self.name)
}
}
impl StdError for MissingCookie {}
mod sealed {
use super::{Reason, Rejection, Rejections};
use http::StatusCode;
use std::convert::Infallible;
use std::fmt;
// This sealed trait exists to allow Filters to return either `Rejection`
// or `!`. There are no other types that make sense, and so it is sealed.
pub trait IsReject: fmt::Debug + Send + Sync {
fn status(&self) -> StatusCode;
fn into_response(&self) -> crate::reply::Response;
}
fn _assert_object_safe() {
fn _assert(_: &dyn IsReject) {}
}
// This weird trait is to allow optimizations of propagating when a
// rejection can *never* happen (currently with the `Never` type,
// eventually to be replaced with `!`).
//
// Using this trait means the `Never` gets propagated to chained filters,
// allowing LLVM to eliminate more code paths. Without it, such as just
// requiring that `Rejection::from(Never)` were used in those filters,
// would mean that links later in the chain may assume a rejection *could*
// happen, and no longer eliminate those branches.
pub trait CombineRejection<E>: Send + Sized {
/// The type that should be returned when only 1 of the two
/// "rejections" occurs.
///
/// # For example:
///
/// `warp::any().and(warp::path("foo"))` has the following steps:
///
/// 1. Since this is `and`, only **one** of the rejections will occur,
/// and as soon as it does, it will be returned.
/// 2. `warp::any()` rejects with `Never`. So, it will never return `Never`.
/// 3. `warp::path()` rejects with `Rejection`. It may return `Rejection`.
///
/// Thus, if the above filter rejects, it will definitely be `Rejection`.
type One: IsReject + From<Self> + From<E> + Into<Rejection>;
/// The type that should be returned when both rejections occur,
/// and need to be combined.
type Combined: IsReject;
fn combine(self, other: E) -> Self::Combined;
}
impl CombineRejection<Rejection> for Rejection {
type One = Rejection;
type Combined = Rejection;
fn combine(self, other: Rejection) -> Self::Combined {
let reason = match (self.reason, other.reason) {
(Reason::Other(left), Reason::Other(right)) => {
Reason::Other(Box::new(Rejections::Combined(left, right)))
}
(Reason::Other(other), Reason::NotFound)
| (Reason::NotFound, Reason::Other(other)) => {
// ignore the NotFound
Reason::Other(other)
}
(Reason::NotFound, Reason::NotFound) => Reason::NotFound,
};
Rejection { reason }
}
}
impl CombineRejection<Infallible> for Rejection {
type One = Rejection;
type Combined = Infallible;
fn combine(self, other: Infallible) -> Self::Combined {
match other {}
}
}
impl CombineRejection<Rejection> for Infallible {
type One = Rejection;
type Combined = Infallible;
fn combine(self, _: Rejection) -> Self::Combined {
match self {}
}
}
impl CombineRejection<Infallible> for Infallible {
type One = Infallible;
type Combined = Infallible;
fn combine(self, _: Infallible) -> Self::Combined {
match self {}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[derive(Debug, PartialEq)]
struct Left;
#[derive(Debug, PartialEq)]
struct Right;
impl Reject for Left {}
impl Reject for Right {}
#[test]
fn rejection_status() {
assert_eq!(not_found().status(), StatusCode::NOT_FOUND);
assert_eq!(
method_not_allowed().status(),
StatusCode::METHOD_NOT_ALLOWED
);
assert_eq!(length_required().status(), StatusCode::LENGTH_REQUIRED);
assert_eq!(payload_too_large().status(), StatusCode::PAYLOAD_TOO_LARGE);
assert_eq!(
unsupported_media_type().status(),
StatusCode::UNSUPPORTED_MEDIA_TYPE
);
assert_eq!(custom(Left).status(), StatusCode::INTERNAL_SERVER_ERROR);
}
#[tokio::test]
async fn combine_rejection_causes_with_some_left_and_none_right() {
let left = custom(Left);
let right = not_found();
let reject = left.combine(right);
let resp = reject.into_response();
assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert_eq!(
response_body_string(resp).await,
"Unhandled rejection: Left"
)
}
#[tokio::test]
async fn combine_rejection_causes_with_none_left_and_some_right() {
let left = not_found();
let right = custom(Right);
let reject = left.combine(right);
let resp = reject.into_response();
assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert_eq!(
response_body_string(resp).await,
"Unhandled rejection: Right"
)
}
#[tokio::test]
async fn unhandled_customs() {
let reject = not_found().combine(custom(Right));
let resp = reject.into_response();
assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert_eq!(
response_body_string(resp).await,
"Unhandled rejection: Right"
);
// There's no real way to determine which is worse, since both are a 500,
// so pick the first one.
let reject = custom(Left).combine(custom(Right));
let resp = reject.into_response();
assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert_eq!(
response_body_string(resp).await,
"Unhandled rejection: Left"
);
// With many rejections, custom still is top priority.
let reject = not_found()
.combine(not_found())
.combine(not_found())
.combine(custom(Right))
.combine(not_found());
let resp = reject.into_response();
assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert_eq!(
response_body_string(resp).await,
"Unhandled rejection: Right"
);
}
async fn response_body_string(resp: crate::reply::Response) -> String {
let (_, body) = resp.into_parts();
let body_bytes = hyper::body::to_bytes(body).await.expect("failed concat");
String::from_utf8_lossy(&body_bytes).to_string()
}
#[test]
fn find_cause() {
let rej = custom(Left);
assert_eq!(rej.find::<Left>(), Some(&Left));
let rej = rej.combine(method_not_allowed());
assert_eq!(rej.find::<Left>(), Some(&Left));
assert!(rej.find::<MethodNotAllowed>().is_some(), "MethodNotAllowed");
}
#[test]
fn size_of_rejection() {
assert_eq!(
::std::mem::size_of::<Rejection>(),
::std::mem::size_of::<usize>(),
);
}
#[derive(Debug)]
struct X(#[allow(unused)] u32);
impl Reject for X {}
fn combine_n<F, R>(n: u32, new_reject: F) -> Rejection
where
F: Fn(u32) -> R,
R: Reject,
{
let mut rej = not_found();
for i in 0..n {
rej = rej.combine(custom(new_reject(i)));
}
rej
}
#[test]
fn test_debug() {
let rej = combine_n(3, X);
let s = format!("{:?}", rej);
assert_eq!(s, "Rejection([X(0), X(1), X(2)])");
}
#[test]
fn convert_big_rejections_into_response() {
let mut rejections = Rejections::Custom(Box::new(std::io::Error::from_raw_os_error(100)));
for _ in 0..50 {
rejections = Rejections::Combined(
Box::new(Rejections::Known(Known::MethodNotAllowed(
MethodNotAllowed { _p: () },
))),
Box::new(rejections),
);
}
let reason = Reason::Other(Box::new(rejections));
let rejection = Rejection { reason };
assert_eq!(
StatusCode::INTERNAL_SERVER_ERROR,
rejection.into_response().status()
);
}
}