Add status and body_text methods to built-in rejections (#1612)

* Add `status` and `body_text` methods to built-in rejections

This should make it easier to customize a built-in rejection while
preserving either the status or body.

Fixes https://github.com/tokio-rs/axum/issues/1611

* changelog

axum-core/CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **added:** Add `body_text` and `status` methods to built-in rejections ([#1612])
+
+[#1612]: https://github.com/tokio-rs/axum/pull/1612
 
 # 0.3.0 (25. November, 2022)
 

axum-core/src/macros.rs

@@ -19,12 +19,21 @@ macro_rules! define_rejection {
             }
         }
 
+        impl $name {
+            /// Get the response body text used for this rejection.
+            pub fn body_text(&self) -> String {
+                format!(concat!($body, ": {}"), self.0).into()
+            }
+
+            /// Get the status code used for this rejection.
+            pub fn status(&self) -> http::StatusCode {
+                http::StatusCode::$status
+            }
+        }
+
         impl crate::response::IntoResponse for $name {
             fn into_response(self) -> $crate::response::Response {
-                (
+                (self.status(), self.body_text()).into_response()
-                    http::StatusCode::$status,
-                    format!(concat!($body, ": {}"), self.0)
-                ).into_response()
             }
         }
 
@@ -70,6 +79,26 @@ macro_rules! composite_rejection {
             }
         }
 
+        impl $name {
+            /// Get the response body text used for this rejection.
+            pub fn body_text(&self) -> String {
+                match self {
+                    $(
+                        Self::$variant(inner) => inner.body_text(),
+                    )+
+                }
+            }
+
+            /// Get the status code used for this rejection.
+            pub fn status(&self) -> http::StatusCode {
+                match self {
+                    $(
+                        Self::$variant(inner) => inner.status(),
+                    )+
+                }
+            }
+        }
+
         $(
             impl From<$variant> for $name {
                 fn from(inner: $variant) -> Self {

axum/CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **added:** Add `body_text` and `status` methods to built-in rejections ([#1612])
+
+[#1612]: https://github.com/tokio-rs/axum/pull/1612
 
 # 0.6.1 (29. November, 2022)
 

axum/src/extract/path/mod.rs

@@ -383,24 +383,39 @@ impl FailedToDeserializePathParams {
     pub fn into_kind(self) -> ErrorKind {
         self.0.kind
     }
-}
 
-impl IntoResponse for FailedToDeserializePathParams {
+    /// Get the response body text used for this rejection.
-    fn into_response(self) -> Response {
+    pub fn body_text(&self) -> String {
-        let (status, body) = match self.0.kind {
+        match self.0.kind {
             ErrorKind::Message(_)
             | ErrorKind::InvalidUtf8InPathParam { .. }
             | ErrorKind::ParseError { .. }
             | ErrorKind::ParseErrorAtIndex { .. }
-            | ErrorKind::ParseErrorAtKey { .. } => (
+            | ErrorKind::ParseErrorAtKey { .. } => format!("Invalid URL: {}", self.0.kind),
-                StatusCode::BAD_REQUEST,
-                format!("Invalid URL: {}", self.0.kind),
-            ),
             ErrorKind::WrongNumberOfParameters { .. } | ErrorKind::UnsupportedType { .. } => {
-                (StatusCode::INTERNAL_SERVER_ERROR, self.0.kind.to_string())
+                self.0.kind.to_string()
             }
-        };
+        }
-        (status, body).into_response()
+    }
+
+    /// Get the status code used for this rejection.
+    pub fn status(&self) -> StatusCode {
+        match self.0.kind {
+            ErrorKind::Message(_)
+            | ErrorKind::InvalidUtf8InPathParam { .. }
+            | ErrorKind::ParseError { .. }
+            | ErrorKind::ParseErrorAtIndex { .. }
+            | ErrorKind::ParseErrorAtKey { .. } => StatusCode::BAD_REQUEST,
+            ErrorKind::WrongNumberOfParameters { .. } | ErrorKind::UnsupportedType { .. } => {
+                StatusCode::INTERNAL_SERVER_ERROR
+            }
+        }
+    }
+}
+
+impl IntoResponse for FailedToDeserializePathParams {
+    fn into_response(self) -> Response {
+        (self.status(), self.body_text()).into_response()
     }
 }
 

axum/src/macros.rs

@@ -59,7 +59,19 @@ macro_rules! define_rejection {
 
         impl $crate::response::IntoResponse for $name {
             fn into_response(self) -> $crate::response::Response {
-                (http::StatusCode::$status, $body).into_response()
+                (self.status(), $body).into_response()
+            }
+        }
+
+        impl $name {
+            /// Get the response body text used for this rejection.
+            pub fn body_text(&self) -> String {
+                $body.into()
+            }
+
+            /// Get the status code used for this rejection.
+            pub fn status(&self) -> http::StatusCode {
+                http::StatusCode::$status
             }
         }
 
@@ -99,10 +111,19 @@ macro_rules! define_rejection {
 
         impl crate::response::IntoResponse for $name {
             fn into_response(self) -> $crate::response::Response {
-                (
+                (self.status(), self.body_text()).into_response()
-                    http::StatusCode::$status,
+            }
-                    format!(concat!($body, ": {}"), self.0),
+        }
-                ).into_response()
+
+        impl $name {
+            /// Get the response body text used for this rejection.
+            pub fn body_text(&self) -> String {
+                format!(concat!($body, ": {}"), self.0).into()
+            }
+
+            /// Get the status code used for this rejection.
+            pub fn status(&self) -> http::StatusCode {
+                http::StatusCode::$status
             }
         }
 
@@ -148,6 +169,26 @@ macro_rules! composite_rejection {
             }
         }
 
+        impl $name {
+            /// Get the response body text used for this rejection.
+            pub fn body_text(&self) -> String {
+                match self {
+                    $(
+                        Self::$variant(inner) => inner.body_text(),
+                    )+
+                }
+            }
+
+            /// Get the status code used for this rejection.
+            pub fn status(&self) -> http::StatusCode {
+                match self {
+                    $(
+                        Self::$variant(inner) => inner.status(),
+                    )+
+                }
+            }
+        }
+
         $(
             impl From<$variant> for $name {
                 fn from(inner: $variant) -> Self {