org.springframework.web.ErrorResponse Maven / Gradle / Ivy
/*
* Copyright 2002-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web;
import java.net.URI;
import java.util.Locale;
import java.util.function.Consumer;
import org.springframework.context.MessageSource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.ProblemDetail;
import org.springframework.lang.Nullable;
/**
* Representation of a complete RFC 7807 error response including status,
* headers, and an RFC 7807 formatted {@link ProblemDetail} body. Allows any
* exception to expose HTTP error response information.
*
* {@link ErrorResponseException} is a default implementation of this
* interface and a convenient base class for other exceptions to use.
*
*
{@code ErrorResponse} is supported as a return value from
* {@code @ExceptionHandler} methods that render directly to the response, e.g.
* by being marked {@code @ResponseBody}, or declared in an
* {@code @RestController} or {@code RestControllerAdvice} class.
*
* @author Rossen Stoyanchev
* @since 6.0
* @see ErrorResponseException
*/
public interface ErrorResponse {
/**
* Return the HTTP status code to use for the response.
*/
HttpStatusCode getStatusCode();
/**
* Return headers to use for the response.
*/
default HttpHeaders getHeaders() {
return HttpHeaders.EMPTY;
}
/**
* Return the body for the response, formatted as an RFC 7807
* {@link ProblemDetail} whose {@link ProblemDetail#getStatus() status}
* should match the response status.
*
Note: The returned {@code ProblemDetail} may be
* updated before the response is rendered, e.g. via
* {@link #updateAndGetBody(MessageSource, Locale)}. Therefore, implementing
* methods should use an instance field, and should not re-create the
* {@code ProblemDetail} on every call, nor use a static variable.
*/
ProblemDetail getBody();
/**
* Return a code to use to resolve the problem "detail" for this exception
* through a {@link MessageSource}.
*
By default this is initialized via
* {@link #getDefaultDetailMessageCode(Class, String)}.
*/
default String getDetailMessageCode() {
return getDefaultDetailMessageCode(getClass(), null);
}
/**
* Return arguments to use along with a {@link #getDetailMessageCode()
* message code} to resolve the problem "detail" for this exception
* through a {@link MessageSource}. The arguments are expanded
* into placeholders of the message value, e.g. "Invalid content type {0}".
*/
@Nullable
default Object[] getDetailMessageArguments() {
return null;
}
/**
* Variant of {@link #getDetailMessageArguments()} that uses the given
* {@link MessageSource} for resolving the message argument values.
*
This is useful for example to expand message codes from validation errors.
*
The default implementation delegates to {@link #getDetailMessageArguments()},
* ignoring the supplied {@code MessageSource} and {@code Locale}.
* @param messageSource the {@code MessageSource} to use for the lookup
* @param locale the {@code Locale} to use for the lookup
*/
@Nullable
default Object[] getDetailMessageArguments(MessageSource messageSource, Locale locale) {
return getDetailMessageArguments();
}
/**
* Return a code to use to resolve the problem "title" for this exception
* through a {@link MessageSource}.
*
By default this is initialized via {@link #getDefaultTitleMessageCode(Class)}.
*/
default String getTitleMessageCode() {
return getDefaultTitleMessageCode(getClass());
}
/**
* Resolve the {@link #getDetailMessageCode() detailMessageCode} and the
* {@link #getTitleMessageCode() titleMessageCode} through the given
* {@link MessageSource}, and if found, update the "detail" and "title"
* fields respectively.
* @param messageSource the {@code MessageSource} to use for the lookup
* @param locale the {@code Locale} to use for the lookup
*/
default ProblemDetail updateAndGetBody(@Nullable MessageSource messageSource, Locale locale) {
if (messageSource != null) {
Object[] arguments = getDetailMessageArguments(messageSource, locale);
String detail = messageSource.getMessage(getDetailMessageCode(), arguments, null, locale);
if (detail != null) {
getBody().setDetail(detail);
}
String title = messageSource.getMessage(getTitleMessageCode(), null, null, locale);
if (title != null) {
getBody().setTitle(title);
}
}
return getBody();
}
/**
* Build a message code for the "detail" field, for the given exception type.
* @param exceptionType the exception type associated with the problem
* @param suffix an optional suffix, e.g. for exceptions that may have multiple
* error message with different arguments
* @return {@code "problemDetail."} followed by the fully qualified
* {@link Class#getName() class name} and an optional suffix
*/
static String getDefaultDetailMessageCode(Class exceptionType, @Nullable String suffix) {
return "problemDetail." + exceptionType.getName() + (suffix != null ? "." + suffix : "");
}
/**
* Build a message code for the "title" field, for the given exception type.
* @param exceptionType the exception type associated with the problem
* @return {@code "problemDetail.title."} followed by the fully qualified
* {@link Class#getName() class name}
*/
static String getDefaultTitleMessageCode(Class exceptionType) {
return "problemDetail.title." + exceptionType.getName();
}
/**
* Static factory method to build an instance via
* {@link #builder(Throwable, HttpStatusCode, String)}.
*/
static ErrorResponse create(Throwable ex, HttpStatusCode statusCode, String detail) {
return builder(ex, statusCode, detail).build();
}
/**
* Return a builder to create an {@code ErrorResponse} instance.
* @param ex the underlying exception that lead to the error response;
* mainly to derive default values for the
* {@linkplain #getDetailMessageCode() detail message code} and for the
* {@linkplain #getTitleMessageCode() title message code}.
* @param statusCode the status code to set in the response
* @param detail the default value for the
* {@link ProblemDetail#setDetail(String) detail} field, unless overridden
* by a {@link MessageSource} lookup with {@link #getDetailMessageCode()}
*/
static Builder builder(Throwable ex, HttpStatusCode statusCode, String detail) {
return new DefaultErrorResponseBuilder(ex, statusCode, detail);
}
/**
* Builder for an {@code ErrorResponse}.
*/
interface Builder {
/**
* Add the given header value(s) under the given name.
* @param headerName the header name
* @param headerValues the header value(s)
* @return the same builder instance
* @see HttpHeaders#add(String, String)
*/
Builder header(String headerName, String... headerValues);
/**
* Manipulate this response's headers with the given consumer. This is
* useful to {@linkplain HttpHeaders#set(String, String) overwrite} or
* {@linkplain HttpHeaders#remove(Object) remove} existing values, or
* use any other {@link HttpHeaders} methods.
* @param headersConsumer a function that consumes the {@code HttpHeaders}
* @return the same builder instance
*/
Builder headers(Consumer headersConsumer);
/**
* Set the underlying {@link ProblemDetail#setDetail(String) detail}.
* @return the same builder instance
*/
Builder detail(String detail);
/**
* Customize the {@link MessageSource} code for looking up the value for
* the underlying {@link #detail(String) detail}.
* By default, this is set to
* {@link ErrorResponse#getDefaultDetailMessageCode(Class, String)} with the
* associated Exception type.
* @param messageCode the message code to use
* @return the same builder instance
* @see ErrorResponse#getDetailMessageCode()
*/
Builder detailMessageCode(String messageCode);
/**
* Set the arguments to provide to the {@link MessageSource} lookup for
* {@link #detailMessageCode(String)}.
* @param messageArguments the arguments to provide
* @return the same builder instance
* @see ErrorResponse#getDetailMessageArguments()
*/
Builder detailMessageArguments(Object... messageArguments);
/**
* Set the underlying {@link ProblemDetail#setType(URI) type} field.
* @return the same builder instance
*/
Builder type(URI type);
/**
* Set the underlying {@link ProblemDetail#setTitle(String) title} field.
* @return the same builder instance
*/
Builder title(@Nullable String title);
/**
* Customize the {@link MessageSource} code for looking up the value for
* the underlying {@link ProblemDetail#setTitle(String) title}.
*
By default, set via
* {@link ErrorResponse#getDefaultTitleMessageCode(Class)} with the
* associated Exception type.
* @param messageCode the message code to use
* @return the same builder instance
* @see ErrorResponse#getTitleMessageCode()
*/
Builder titleMessageCode(String messageCode);
/**
* Set the underlying {@link ProblemDetail#setInstance(URI) instance} field.
* @return the same builder instance
*/
Builder instance(@Nullable URI instance);
/**
* Set a "dynamic" {@link ProblemDetail#setProperty(String, Object)
* property} on the underlying {@code ProblemDetail}.
* @return the same builder instance
*/
Builder property(String name, @Nullable Object value);
/**
* Build the {@code ErrorResponse} instance.
*/
ErrorResponse build();
/**
* Build the {@code ErrorResponse} instance and also resolve the "detail"
* and "title" through the given {@link MessageSource}. Effectively a
* shortcut for calling {@link #build()} and then
* {@link ErrorResponse#updateAndGetBody(MessageSource, Locale)}.
* @since 6.0.3
*/
default ErrorResponse build(@Nullable MessageSource messageSource, Locale locale) {
ErrorResponse response = build();
response.updateAndGetBody(messageSource, locale);
return response;
}
}
}