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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.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.ws.rs.core.CacheControl;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
import org.apache.cxf.message.Message;
import org.apache.cxf.phase.PhaseInterceptorChain;
public class CacheControlHeaderProvider implements HeaderDelegate {
public static final String CACHE_CONTROL_SEPARATOR_PROPERTY =
"org.apache.cxf.http.cache-control.separator";
private static final String DEFAULT_SEPARATOR = ",";
private static final String COMPLEX_HEADER_EXPRESSION =
"(([\\w-]+=\"[^\"]*\")|([\\w-]+=[\\w]+)|([\\w-]+))";
private static final Pattern COMPLEX_HEADER_PATTERN =
Pattern.compile(COMPLEX_HEADER_EXPRESSION);
private static final String PUBLIC = "public";
private static final String PRIVATE = "private";
private static final String NO_CACHE = "no-cache";
private static final String NO_STORE = "no-store";
private static final String NO_TRANSFORM = "no-transform";
private static final String MUST_REVALIDATE = "must-revalidate";
private static final String PROXY_REVALIDATE = "proxy-revalidate";
private static final String MAX_AGE = "max-age";
private static final String SMAX_AGE = "s-maxage";
public CacheControl fromString(String c) {
boolean isPrivate = false;
List privateFields = new ArrayList();
boolean noCache = false;
List noCacheFields = new ArrayList();
boolean noStore = false;
boolean noTransform = false;
boolean mustRevalidate = false;
boolean proxyRevalidate = false;
int maxAge = -1;
int sMaxAge = -1;
Map extensions = new HashMap();
String[] tokens = getTokens(c);
for (String rawToken : tokens) {
String token = rawToken.trim();
if (token.startsWith(MAX_AGE)) {
maxAge = Integer.parseInt(token.substring(MAX_AGE.length() + 1));
} else if (token.startsWith(SMAX_AGE)) {
sMaxAge = Integer.parseInt(token.substring(SMAX_AGE.length() + 1));
} else if (token.startsWith(PUBLIC)) {
// ignore
} else if (token.startsWith(NO_STORE)) {
noStore = true;
} else if (token.startsWith(NO_TRANSFORM)) {
noTransform = true;
} else if (token.startsWith(MUST_REVALIDATE)) {
mustRevalidate = true;
} else if (token.startsWith(PROXY_REVALIDATE)) {
proxyRevalidate = true;
} else if (token.startsWith(PRIVATE)) {
isPrivate = true;
addFields(privateFields, token);
} else if (token.startsWith(NO_CACHE)) {
noCache = true;
addFields(noCacheFields, token);
} else {
String[] extPair = token.split("=");
String value = extPair.length == 2 ? extPair[1] : "";
extensions.put(extPair[0], value);
}
}
CacheControl cc = new CacheControl();
cc.setMaxAge(maxAge);
cc.setSMaxAge(sMaxAge);
cc.setPrivate(isPrivate);
cc.getPrivateFields().addAll(privateFields);
cc.setMustRevalidate(mustRevalidate);
cc.setProxyRevalidate(proxyRevalidate);
cc.setNoCache(noCache);
cc.getNoCacheFields().addAll(noCacheFields);
cc.setNoStore(noStore);
cc.setNoTransform(noTransform);
cc.getCacheExtension().putAll(extensions);
return cc;
}
private String[] getTokens(String c) {
if (c.contains("\"")) {
List values = new ArrayList(4);
Matcher m = COMPLEX_HEADER_PATTERN.matcher(c);
while (m.find()) {
String val = m.group().trim();
if (val.length() > 0) {
values.add(val);
}
}
return values.toArray(new String[]{});
} else {
String separator = getSeparator();
return c.split(separator);
}
}
public String toString(CacheControl c) {
String separator = getSeparator();
StringBuilder sb = new StringBuilder();
if (c.isPrivate()) {
sb.append(PRIVATE);
handleFields(c.getPrivateFields(), sb);
sb.append(separator);
}
if (c.isNoCache()) {
sb.append(NO_CACHE);
handleFields(c.getNoCacheFields(), sb);
sb.append(separator);
}
if (c.isNoStore()) {
sb.append(NO_STORE).append(separator);
}
if (c.isNoTransform()) {
sb.append(NO_TRANSFORM).append(separator);
}
if (c.isMustRevalidate()) {
sb.append(MUST_REVALIDATE).append(separator);
}
if (c.isProxyRevalidate()) {
sb.append(PROXY_REVALIDATE).append(separator);
}
if (c.getMaxAge() != -1) {
sb.append(MAX_AGE).append('=').append(c.getMaxAge()).append(separator);
}
if (c.getSMaxAge() != -1) {
sb.append(SMAX_AGE).append('=').append(c.getSMaxAge()).append(separator);
}
Map exts = c.getCacheExtension();
for (Map.Entry entry : exts.entrySet()) {
sb.append(entry.getKey());
String v = entry.getValue();
if (v != null) {
sb.append("=");
if (v.indexOf(' ') != -1) {
sb.append('\"').append(v).append('\"');
} else {
sb.append(v);
}
}
sb.append(separator);
}
String s = sb.toString();
return s.endsWith(separator) ? s.substring(0, s.length() - 1) : s;
}
private static void addFields(List fields, String token) {
int i = token.indexOf('=');
if (i != -1) {
String f = i == token.length() + 1 ? "" : token.substring(i + 1);
if (f.length() < 2 || !f.startsWith("\"") || !f.endsWith("\"")) {
return;
} else {
f = f.length() == 2 ? "" : f.substring(1, f.length() - 1);
if (f.length() > 0) {
String[] values = f.split(",");
for (String v : values) {
fields.add(v.trim());
}
}
}
}
}
private static void handleFields(List fields, StringBuilder sb) {
if (fields.isEmpty()) {
return;
}
sb.append('=');
sb.append('\"');
for (Iterator it = fields.iterator(); it.hasNext();) {
sb.append(it.next());
if (it.hasNext()) {
sb.append(',');
}
}
sb.append('\"');
}
protected String getSeparator() {
String separator = DEFAULT_SEPARATOR;
Message message = getCurrentMessage();
if (message != null) {
Object sepProperty = message.getContextualProperty(CACHE_CONTROL_SEPARATOR_PROPERTY);
if (sepProperty != null) {
separator = sepProperty.toString();
}
}
return separator;
}
protected Message getCurrentMessage() {
return PhaseInterceptorChain.getCurrentMessage();
}
}