org.springframework.boot.autoconfigure.web.servlet.error.AbstractErrorController Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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.boot.autoconfigure.web.servlet.error;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.util.Assert;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.ModelAndView;
/**
* Abstract base class for error {@link Controller @Controller} implementations.
*
* @author Dave Syer
* @author Phillip Webb
* @since 1.3.0
* @see ErrorAttributes
*/
public abstract class AbstractErrorController implements ErrorController {
private final ErrorAttributes errorAttributes;
private final List errorViewResolvers;
public AbstractErrorController(ErrorAttributes errorAttributes) {
this(errorAttributes, null);
}
public AbstractErrorController(ErrorAttributes errorAttributes, List errorViewResolvers) {
Assert.notNull(errorAttributes, "ErrorAttributes must not be null");
this.errorAttributes = errorAttributes;
this.errorViewResolvers = sortErrorViewResolvers(errorViewResolvers);
}
private List sortErrorViewResolvers(List resolvers) {
List sorted = new ArrayList<>();
if (resolvers != null) {
sorted.addAll(resolvers);
AnnotationAwareOrderComparator.sortIfNecessary(sorted);
}
return sorted;
}
protected Map getErrorAttributes(HttpServletRequest request, boolean includeStackTrace) {
WebRequest webRequest = new ServletWebRequest(request);
return this.errorAttributes.getErrorAttributes(webRequest, includeStackTrace);
}
protected boolean getTraceParameter(HttpServletRequest request) {
String parameter = request.getParameter("trace");
if (parameter == null) {
return false;
}
return !"false".equalsIgnoreCase(parameter);
}
protected HttpStatus getStatus(HttpServletRequest request) {
Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");
if (statusCode == null) {
return HttpStatus.INTERNAL_SERVER_ERROR;
}
try {
return HttpStatus.valueOf(statusCode);
}
catch (Exception ex) {
return HttpStatus.INTERNAL_SERVER_ERROR;
}
}
/**
* Resolve any specific error views. By default this method delegates to
* {@link ErrorViewResolver ErrorViewResolvers}.
* @param request the request
* @param response the response
* @param status the HTTP status
* @param model the suggested model
* @return a specific {@link ModelAndView} or {@code null} if the default should be
* used
* @since 1.4.0
*/
protected ModelAndView resolveErrorView(HttpServletRequest request, HttpServletResponse response, HttpStatus status,
Map model) {
for (ErrorViewResolver resolver : this.errorViewResolvers) {
ModelAndView modelAndView = resolver.resolveErrorView(request, status, model);
if (modelAndView != null) {
return modelAndView;
}
}
return null;
}
}