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/**
* 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.cxf.jaxrs.impl;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import org.apache.cxf.common.util.StringUtils;
import org.apache.cxf.jaxrs.ext.RequestHandler;
import org.apache.cxf.jaxrs.model.ProviderInfo;
import org.apache.cxf.jaxrs.model.wadl.WadlGenerator;
import org.apache.cxf.jaxrs.provider.ProviderFactory;
import org.apache.cxf.jaxrs.utils.HttpUtils;
import org.apache.cxf.message.Message;
public class RequestPreprocessor {
private static final String ACCEPT_QUERY = "_type";
private static final String CTYPE_QUERY = "_ctype";
private static final String METHOD_QUERY = "_method";
private static final String METHOD_HEADER = "X-HTTP-Method-Override";
private static final String SCHEMA_EXTENSION = ".xsd";
private static final String WADL_EXTENSION = ".wadl";
private static final Map SHORTCUTS;
static {
SHORTCUTS = new HashMap();
SHORTCUTS.put("json", "application/json");
SHORTCUTS.put("text", "text/*");
SHORTCUTS.put("xml", "application/xml");
SHORTCUTS.put("atom", "application/atom+xml");
SHORTCUTS.put("html", "text/html");
SHORTCUTS.put("wadl", "application/vnd.sun.wadl+xml");
// more to come
}
private Map languageMappings;
private Map extensionMappings;
public RequestPreprocessor() {
this(null, null);
}
public RequestPreprocessor(Map languageMappings,
Map extensionMappings) {
this.languageMappings =
languageMappings == null ? Collections.emptyMap() : languageMappings;
this.extensionMappings =
extensionMappings == null ? Collections.emptyMap() : extensionMappings;
}
public String preprocess(Message m, UriInfo u) {
handleExtensionMappings(m, u);
handleLanguageMappings(m, u);
MultivaluedMap queries = u.getQueryParameters();
handleTypeQuery(m, queries);
handleCType(m, queries);
handleMethod(m, queries, new HttpHeadersImpl(m));
Response r = checkMetadataRequest(m, u);
if (r != null) {
m.getExchange().put(Response.class, r);
}
return new UriInfoImpl(m, null).getPath();
}
private void handleLanguageMappings(Message m, UriInfo uriInfo) {
String path = uriInfo.getPath(false);
for (Map.Entry entry : languageMappings.entrySet()) {
if (path.endsWith("." + entry.getKey())) {
updateAcceptLanguageHeader(m, entry.getValue().toString());
updatePath(m, path, entry.getKey().toString());
break;
}
}
}
private void handleExtensionMappings(Message m, UriInfo uriInfo) {
String path = uriInfo.getPath(false);
for (Map.Entry entry : extensionMappings.entrySet()) {
String key = entry.getKey().toString();
if (path.endsWith("." + key)) {
updateAcceptTypeHeader(m, entry.getValue().toString());
updatePath(m, path, key);
if ("wadl".equals(key)) {
// the path has been updated and Accept was not necessarily set to
// WADL type (xml or json or html - other options)
String query = (String)m.get(Message.QUERY_STRING);
if (StringUtils.isEmpty(query)) {
query = WadlGenerator.WADL_QUERY;
} else if (!query.contains(WadlGenerator.WADL_QUERY)) {
query += "&" + WadlGenerator.WADL_QUERY;
}
m.put(Message.QUERY_STRING, query);
}
break;
}
}
}
@SuppressWarnings("unchecked")
private void updateAcceptLanguageHeader(Message m, String anotherValue) {
List acceptLanguage =
((Map>)m.get(Message.PROTOCOL_HEADERS)).get(HttpHeaders.ACCEPT_LANGUAGE);
if (acceptLanguage == null) {
acceptLanguage = new ArrayList();
}
acceptLanguage.add(anotherValue);
((Map>)m.get(Message.PROTOCOL_HEADERS))
.put(HttpHeaders.ACCEPT_LANGUAGE, acceptLanguage);
}
private void updatePath(Message m, String path, String suffix) {
String newPath = path.substring(0, path.length() - (suffix.length() + 1));
HttpUtils.updatePath(m, newPath);
}
private void handleMethod(Message m,
MultivaluedMap queries,
HttpHeaders headers) {
String method = queries.getFirst(METHOD_QUERY);
if (method == null) {
List values = headers.getRequestHeader(METHOD_HEADER);
if (values.size() == 1) {
method = values.get(0);
}
}
if (method != null) {
m.put(Message.HTTP_REQUEST_METHOD, method);
}
}
private void handleTypeQuery(Message m, MultivaluedMap queries) {
String type = queries.getFirst(ACCEPT_QUERY);
if (type != null) {
if (SHORTCUTS.containsKey(type)) {
type = SHORTCUTS.get(type);
}
updateAcceptTypeHeader(m, type);
}
}
private void handleCType(Message m, MultivaluedMap queries) {
String type = queries.getFirst(CTYPE_QUERY);
if (type != null) {
if (SHORTCUTS.containsKey(type)) {
type = SHORTCUTS.get(type);
}
m.put(Message.CONTENT_TYPE, type);
}
}
@SuppressWarnings("unchecked")
private void updateAcceptTypeHeader(Message m, String acceptValue) {
m.put(Message.ACCEPT_CONTENT_TYPE, acceptValue);
((Map>)m.get(Message.PROTOCOL_HEADERS))
.put(HttpHeaders.ACCEPT, Collections.singletonList(acceptValue));
}
/*
* TODO : looks like QueryHandler is well suited for the purpose of serving
* wadl/wsdl2 root requests with URIs which can not be used for selecting
* ClassResourceInfo which is where RequestFilters invoked after the resource class
* has been selected are handy. Consider implementing this method as part of the QueryHandler,
* we will need to save the list of ClassResourceInfos on the EndpointInfo though
*/
public Response checkMetadataRequest(Message m, UriInfo ui) {
String originalRequestURI = (String)m.get(Message.REQUEST_URI);
String query = (String)m.get(Message.QUERY_STRING);
if (query != null && query.contains(WadlGenerator.WADL_QUERY)) {
String requestURI = getValueWithoutSlash(originalRequestURI);
String baseAddress = getValueWithoutSlash(HttpUtils.getBaseAddress(m));
if (baseAddress.equals(requestURI)) {
return handleMetadataRequest(m);
}
} else if (originalRequestURI != null && (originalRequestURI.endsWith(SCHEMA_EXTENSION)
|| originalRequestURI.endsWith(WADL_EXTENSION))) {
// trying WADLGenerator which may be caching schema resources won't
// interfere with custom schema handlers if any
return handleMetadataRequest(m);
}
return null;
}
private Response handleMetadataRequest(Message m) {
List> shs = ProviderFactory.getInstance(m).getRequestHandlers();
// this is actually being tested by ProviderFactory unit tests but just in case
// WadlGenerator, the custom or default one, must be the first one
if (shs.size() > 0 && shs.get(0).getProvider() instanceof WadlGenerator) {
return shs.get(0).getProvider().handleRequest(m, null);
} else {
return null;
}
}
private static String getValueWithoutSlash(String value) {
return value.endsWith("/") ? value.substring(0, value.length() - 1) : value;
}
}
