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/*
* Copyright 2012-2018 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.web.servlet.error;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
/**
* Default implementation of {@link ErrorAttributes}. Provides the following attributes
* when possible:
*
*
timestamp - The time that the errors were extracted
*
status - The status code
*
error - The error reason
*
exception - The class name of the root exception (if configured)
*
message - The exception message
*
errors - Any {@link ObjectError}s from a {@link BindingResult} exception
*
trace - The exception stack trace
*
path - The URL path when the exception was raised
*
*
* @author Phillip Webb
* @author Dave Syer
* @author Stephane Nicoll
* @author Vedran Pavic
* @since 2.0.0
* @see ErrorAttributes
*/
@Order(Ordered.HIGHEST_PRECEDENCE)
public class DefaultErrorAttributes
implements ErrorAttributes, HandlerExceptionResolver, Ordered {
private static final String ERROR_ATTRIBUTE = DefaultErrorAttributes.class.getName()
+ ".ERROR";
private final boolean includeException;
/**
* Create a new {@link DefaultErrorAttributes} instance that does not include the
* "exception" attribute.
*/
public DefaultErrorAttributes() {
this(false);
}
/**
* Create a new {@link DefaultErrorAttributes} instance.
* @param includeException whether to include the "exception" attribute
*/
public DefaultErrorAttributes(boolean includeException) {
this.includeException = includeException;
}
@Override
public int getOrder() {
return Ordered.HIGHEST_PRECEDENCE;
}
@Override
public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex) {
storeErrorAttributes(request, ex);
return null;
}
private void storeErrorAttributes(HttpServletRequest request, Exception ex) {
request.setAttribute(ERROR_ATTRIBUTE, ex);
}
@Override
public Map getErrorAttributes(WebRequest webRequest,
boolean includeStackTrace) {
Map errorAttributes = new LinkedHashMap<>();
errorAttributes.put("timestamp", new Date());
addStatus(errorAttributes, webRequest);
addErrorDetails(errorAttributes, webRequest, includeStackTrace);
addPath(errorAttributes, webRequest);
return errorAttributes;
}
private void addStatus(Map errorAttributes,
RequestAttributes requestAttributes) {
Integer status = getAttribute(requestAttributes,
"javax.servlet.error.status_code");
if (status == null) {
errorAttributes.put("status", 999);
errorAttributes.put("error", "None");
return;
}
errorAttributes.put("status", status);
try {
errorAttributes.put("error", HttpStatus.valueOf(status).getReasonPhrase());
}
catch (Exception ex) {
// Unable to obtain a reason
errorAttributes.put("error", "Http Status " + status);
}
}
private void addErrorDetails(Map errorAttributes,
WebRequest webRequest, boolean includeStackTrace) {
Throwable error = getError(webRequest);
if (error != null) {
while (error instanceof ServletException && error.getCause() != null) {
error = ((ServletException) error).getCause();
}
if (this.includeException) {
errorAttributes.put("exception", error.getClass().getName());
}
addErrorMessage(errorAttributes, error);
if (includeStackTrace) {
addStackTrace(errorAttributes, error);
}
}
Object message = getAttribute(webRequest, "javax.servlet.error.message");
if ((!StringUtils.isEmpty(message) || errorAttributes.get("message") == null)
&& !(error instanceof BindingResult)) {
errorAttributes.put("message",
StringUtils.isEmpty(message) ? "No message available" : message);
}
}
private void addErrorMessage(Map errorAttributes, Throwable error) {
BindingResult result = extractBindingResult(error);
if (result == null) {
errorAttributes.put("message", error.getMessage());
return;
}
if (result.hasErrors()) {
errorAttributes.put("errors", result.getAllErrors());
errorAttributes.put("message",
"Validation failed for object='" + result.getObjectName()
+ "'. Error count: " + result.getErrorCount());
}
else {
errorAttributes.put("message", "No errors");
}
}
private BindingResult extractBindingResult(Throwable error) {
if (error instanceof BindingResult) {
return (BindingResult) error;
}
if (error instanceof MethodArgumentNotValidException) {
return ((MethodArgumentNotValidException) error).getBindingResult();
}
return null;
}
private void addStackTrace(Map errorAttributes, Throwable error) {
StringWriter stackTrace = new StringWriter();
error.printStackTrace(new PrintWriter(stackTrace));
stackTrace.flush();
errorAttributes.put("trace", stackTrace.toString());
}
private void addPath(Map errorAttributes,
RequestAttributes requestAttributes) {
String path = getAttribute(requestAttributes, "javax.servlet.error.request_uri");
if (path != null) {
errorAttributes.put("path", path);
}
}
@Override
public Throwable getError(WebRequest webRequest) {
Throwable exception = getAttribute(webRequest, ERROR_ATTRIBUTE);
if (exception == null) {
exception = getAttribute(webRequest, "javax.servlet.error.exception");
}
return exception;
}
@SuppressWarnings("unchecked")
private T getAttribute(RequestAttributes requestAttributes, String name) {
return (T) requestAttributes.getAttribute(name, RequestAttributes.SCOPE_REQUEST);
}
}
