/*******************************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.olingo.odata2.core.servlet;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.http.HttpServletRequest;
import org.apache.olingo.odata2.api.batch.BatchException;
import org.apache.olingo.odata2.api.commons.HttpStatusCodes;
import org.apache.olingo.odata2.api.ep.EntityProvider;
import org.apache.olingo.odata2.api.ep.EntityProviderException;
import org.apache.olingo.odata2.api.exception.MessageReference;
import org.apache.olingo.odata2.api.exception.ODataApplicationException;
import org.apache.olingo.odata2.api.exception.ODataException;
import org.apache.olingo.odata2.api.exception.ODataHttpException;
import org.apache.olingo.odata2.api.exception.ODataMessageException;
import org.apache.olingo.odata2.api.processor.ODataErrorContext;
import org.apache.olingo.odata2.api.processor.ODataResponse;
import org.apache.olingo.odata2.core.commons.ContentType;
import org.apache.olingo.odata2.core.exception.MessageService;
import org.apache.olingo.odata2.core.exception.MessageService.Message;
import org.apache.olingo.odata2.core.exception.ODataRuntimeException;
/**
*
*/
public class ODataExceptionWrapper {
private static final String DOLLAR_FORMAT = "$format";
private static final String DOLLAR_FORMAT_JSON = "json";
private static final Locale DEFAULT_RESPONSE_LOCALE = Locale.ENGLISH;
private final ODataErrorContext errorContext = new ODataErrorContext();
private final String contentType;
private final Locale messageLocale;
private final URI requestUri;
private final Map<String, List<String>> httpRequestHeaders;
public ODataExceptionWrapper(final HttpServletRequest req) {
try {
requestUri = new URI(req.getRequestURI());
} catch (URISyntaxException e) {
throw new ODataRuntimeException(e);
}
httpRequestHeaders = RestUtil.extractHeaders(req);
Map<String, String> queryParameters = RestUtil.extractQueryParameters(req.getQueryString());
List<Locale> acceptableLanguages = RestUtil.extractAcceptableLanguage(req.getHeader("Accept-Language"));
List<String> acceptHeaders = RestUtil.extractAcceptHeaders(req.getHeader("Accept"));
contentType = getContentType(queryParameters, acceptHeaders).toContentTypeString();
messageLocale = MessageService.getSupportedLocale(getLanguages(acceptableLanguages), DEFAULT_RESPONSE_LOCALE);
}
public ODataResponse wrapInExceptionResponse(final Exception exception) {
try {
final Exception toHandleException = extractException(exception);
fillErrorContext(toHandleException);
if (toHandleException instanceof ODataApplicationException) {
enhanceContextWithApplicationException((ODataApplicationException) toHandleException);
} else if (toHandleException instanceof ODataMessageException) {
enhanceContextWithMessageException((ODataMessageException) toHandleException);
}
ODataResponse oDataResponse;
// if (callback != null) {
// oDataResponse = handleErrorCallback(callback);
// } else {
oDataResponse = EntityProvider.writeErrorDocument(errorContext);
// }
if (!oDataResponse.containsHeader(org.apache.olingo.odata2.api.commons.HttpHeaders.CONTENT_TYPE)) {
oDataResponse = ODataResponse.fromResponse(oDataResponse).contentHeader(contentType).build();
}
return oDataResponse;
} catch (Exception e) {
ODataResponse response = ODataResponse.entity("Exception during error handling occured!")
.contentHeader(ContentType.TEXT_PLAIN.toContentTypeString())
.status(HttpStatusCodes.INTERNAL_SERVER_ERROR).build();
return response;
}
}
private Exception extractException(final Exception exception) {
if (exception instanceof ODataException) {
ODataException odataException = (ODataException) exception;
if (odataException.isCausedByApplicationException()) {
return odataException.getApplicationExceptionCause();
} else if (odataException.isCausedByHttpException()) {
return odataException.getHttpExceptionCause();
} else if (odataException.isCausedByMessageException()) {
return odataException.getMessageExceptionCause();
}
}
return exception;
}
private void enhanceContextWithApplicationException(final ODataApplicationException toHandleException) {
errorContext.setHttpStatus(toHandleException.getHttpStatus());
errorContext.setErrorCode(toHandleException.getCode());
}
private void enhanceContextWithMessageException(final ODataMessageException toHandleException) {
errorContext.setErrorCode(toHandleException.getErrorCode());
MessageReference messageReference = toHandleException.getMessageReference();
Message localizedMessage = messageReference == null ? null : extractEntity(messageReference);
if (localizedMessage != null) {
errorContext.setMessage(localizedMessage.getText());
errorContext.setLocale(localizedMessage.getLocale());
}
if (toHandleException instanceof ODataHttpException) {
errorContext.setHttpStatus(((ODataHttpException) toHandleException).getHttpStatus());
} else if (toHandleException instanceof EntityProviderException) {
errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
} else if (toHandleException instanceof BatchException) {
errorContext.setHttpStatus(HttpStatusCodes.BAD_REQUEST);
}
}
private Message extractEntity(final MessageReference context) {
return MessageService.getMessage(messageLocale, context);
}
private List<Locale> getLanguages(final List<Locale> acceptableLanguages) {
if (acceptableLanguages.isEmpty()) {
return Arrays.asList(DEFAULT_RESPONSE_LOCALE);
}
return acceptableLanguages;
}
private ContentType getContentType(final Map<String, String> queryParameters, final List<String> acceptHeaders) {
ContentType contentType = getContentTypeByUriInfo(queryParameters);
if (contentType == null) {
contentType = getContentTypeByAcceptHeader(acceptHeaders);
}
return contentType;
}
private ContentType getContentTypeByUriInfo(final Map<String, String> queryParameters) {
ContentType contentType = null;
if (queryParameters != null) {
if (queryParameters.containsKey(DOLLAR_FORMAT)) {
String contentTypeString = queryParameters.get(DOLLAR_FORMAT);
if (DOLLAR_FORMAT_JSON.equals(contentTypeString)) {
contentType = ContentType.APPLICATION_JSON;
} else {
// Any format mentioned in the $format parameter other than json results in an application/xml content type
// for error messages due to the OData V2 Specification.
contentType = ContentType.APPLICATION_XML;
}
}
}
return contentType;
}
private ContentType getContentTypeByAcceptHeader(final List<String> acceptHeaders) {
for (String type : acceptHeaders) {
if (ContentType.isParseable(type)) {
ContentType convertedContentType = ContentType.create(type);
if (convertedContentType.isWildcard()
|| ContentType.APPLICATION_XML.equals(convertedContentType)
|| ContentType.APPLICATION_XML_CS_UTF_8.equals(convertedContentType)
|| ContentType.APPLICATION_ATOM_XML.equals(convertedContentType)
|| ContentType.APPLICATION_ATOM_XML_CS_UTF_8.equals(convertedContentType)) {
return ContentType.APPLICATION_XML;
} else if (ContentType.APPLICATION_JSON.equals(convertedContentType)
|| ContentType.APPLICATION_JSON_CS_UTF_8.equals(convertedContentType)) {
return ContentType.APPLICATION_JSON;
}
}
}
return ContentType.APPLICATION_XML;
}
private void fillErrorContext(final Exception exception) {
errorContext.setContentType(contentType);
errorContext.setException(exception);
errorContext.setHttpStatus(HttpStatusCodes.INTERNAL_SERVER_ERROR);
errorContext.setErrorCode(null);
errorContext.setMessage(exception.getMessage());
errorContext.setLocale(DEFAULT_RESPONSE_LOCALE);
errorContext.setRequestUri(requestUri);
if (httpRequestHeaders != null) {
for (Entry<String, List<String>> entry : httpRequestHeaders.entrySet()) {
errorContext.putRequestHeader(entry.getKey(), entry.getValue());
}
}
}
}