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com.facebook.presto.jdbc.internal.airlift.http.client.CacheControl Maven / Gradle / Ivy
/**
* 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 com.facebook.presto.jdbc.internal.airlift.http.client;
import com.facebook.presto.jdbc.internal.guava.base.Objects;
import com.facebook.presto.jdbc.internal.guava.base.Splitter;
import com.facebook.presto.jdbc.internal.guava.collect.ImmutableList;
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;
// This code was forked from Apache CXF CacheControl and CacheControlHeaderProvider
public class CacheControl
{
private static final String 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";
private int maxAge = -1;
private int sMaxAge = -1;
private boolean isPrivate = false;
private boolean noCache = false;
private boolean noStore = false;
private boolean noTransform = true;
private boolean mustRevalidate = false;
private boolean proxyRevalidate = false;
private Map cacheExtensions = null;
private List noCacheFields = null;
private List privateFields = null;
public CacheControl()
{
}
public Map getCacheExtension()
{
if (cacheExtensions == null) {
cacheExtensions = new HashMap<>();
}
return cacheExtensions;
}
public int getMaxAge()
{
return maxAge;
}
public List getNoCacheFields()
{
if (noCacheFields == null) {
noCacheFields = new ArrayList<>();
}
return noCacheFields;
}
public List getPrivateFields()
{
if (privateFields == null) {
privateFields = new ArrayList<>();
}
return privateFields;
}
public int getSMaxAge()
{
return sMaxAge;
}
public boolean isMustRevalidate()
{
return mustRevalidate;
}
public boolean isNoCache()
{
return noCache;
}
public boolean isNoStore()
{
return noStore;
}
public boolean isNoTransform()
{
return noTransform;
}
public boolean isPrivate()
{
return isPrivate;
}
public boolean isProxyRevalidate()
{
return proxyRevalidate;
}
public void setMaxAge(int maxAge)
{
this.maxAge = maxAge;
}
public void setMustRevalidate(boolean mustRevalidate)
{
this.mustRevalidate = mustRevalidate;
}
public void setNoCache(boolean noCache)
{
this.noCache = noCache;
}
public void setNoStore(boolean noStore)
{
this.noStore = noStore;
}
public void setNoTransform(boolean noTransform)
{
this.noTransform = noTransform;
}
public void setPrivate(boolean isPrivate)
{
this.isPrivate = isPrivate;
}
public void setProxyRevalidate(boolean proxyRevalidate)
{
this.proxyRevalidate = proxyRevalidate;
}
public void setSMaxAge(int sMaxAge)
{
this.sMaxAge = sMaxAge;
}
public static CacheControl valueOf(String string)
{
CacheControl cacheControl = new CacheControl();
// for some reason the default in cache control is true
cacheControl.setNoTransform(false);
List tokens = getTokens(string);
for (String rawToken : tokens) {
String token = rawToken.trim();
if (token.startsWith(MAX_AGE)) {
cacheControl.setMaxAge(Integer.parseInt(token.substring(MAX_AGE.length() + 1)));
}
else if (token.startsWith(SMAX_AGE)) {
cacheControl.setSMaxAge(Integer.parseInt(token.substring(SMAX_AGE.length() + 1)));
}
else if (token.startsWith(PUBLIC)) {
// ignore
}
else if (token.startsWith(NO_STORE)) {
cacheControl.setNoStore(true);
}
else if (token.startsWith(NO_TRANSFORM)) {
cacheControl.setNoTransform(true);
}
else if (token.startsWith(MUST_REVALIDATE)) {
cacheControl.setMustRevalidate(true);
}
else if (token.startsWith(PROXY_REVALIDATE)) {
cacheControl.setProxyRevalidate(true);
}
else if (token.startsWith(PRIVATE)) {
cacheControl.setPrivate(true);
addFields(cacheControl.getPrivateFields(), token);
}
else if (token.startsWith(NO_CACHE)) {
cacheControl.setNoCache(true);
addFields(cacheControl.getNoCacheFields(), token);
}
else {
List pair = ImmutableList.copyOf(Splitter.on("=").limit(2).split(token));
if (pair.size() == 2) {
cacheControl.getCacheExtension().put(pair.get(0), pair.get(1));
}
else {
cacheControl.getCacheExtension().put(pair.get(0), "");
}
}
}
return cacheControl;
}
public String toString()
{
StringBuilder buffer = new StringBuilder();
if (isPrivate()) {
buffer.append(PRIVATE);
handleFields(getPrivateFields(), buffer);
buffer.append(SEPARATOR);
}
if (isNoCache()) {
buffer.append(NO_CACHE);
handleFields(getNoCacheFields(), buffer);
buffer.append(SEPARATOR);
}
if (isNoStore()) {
buffer.append(NO_STORE).append(SEPARATOR);
}
if (isNoTransform()) {
buffer.append(NO_TRANSFORM).append(SEPARATOR);
}
if (isMustRevalidate()) {
buffer.append(MUST_REVALIDATE).append(SEPARATOR);
}
if (isProxyRevalidate()) {
buffer.append(PROXY_REVALIDATE).append(SEPARATOR);
}
if (getMaxAge() != -1) {
buffer.append(MAX_AGE).append('=').append(getMaxAge()).append(SEPARATOR);
}
if (getSMaxAge() != -1) {
buffer.append(SMAX_AGE).append('=').append(getSMaxAge()).append(SEPARATOR);
}
Map extension = getCacheExtension();
for (Map.Entry entry : extension.entrySet()) {
buffer.append(entry.getKey());
String value = entry.getValue();
if (value != null) {
buffer.append("=");
if (value.indexOf(' ') != -1) {
buffer.append('\"').append(value).append('\"');
}
else {
buffer.append(value);
}
}
buffer.append(SEPARATOR);
}
String string = buffer.toString();
if (string.endsWith(SEPARATOR)) {
string = string.substring(0, string.length() - 1);
}
return string;
}
private static void handleFields(List fields, StringBuilder buffer) {
if (fields.isEmpty()) {
return;
}
buffer.append('=');
buffer.append('\"');
for (Iterator it = fields.iterator(); it.hasNext();) {
buffer.append(it.next());
if (it.hasNext()) {
buffer.append(',');
}
}
buffer.append('\"');
}
private static List getTokens(String string)
{
if (string.contains("\"")) {
List values = new ArrayList<>(4);
Matcher m = COMPLEX_HEADER_PATTERN.matcher(string);
while (m.find()) {
String val = m.group().trim();
if (val.length() > 0) {
values.add(val);
}
}
return ImmutableList.copyOf(values);
}
else {
return ImmutableList.copyOf(Splitter.on(SEPARATOR).split(string));
}
}
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("\"")) {
f = f.length() == 2 ? "" : f.substring(1, f.length() - 1);
if (f.length() > 0) {
List values = ImmutableList.copyOf(Splitter.on(",").split(f));
for (String v : values) {
fields.add(v.trim());
}
}
}
}
}
@Override
public int hashCode()
{
return Objects.hashCode(maxAge,
sMaxAge,
isPrivate,
noCache,
noStore,
noTransform,
mustRevalidate,
proxyRevalidate,
cacheExtensions,
noCacheFields,
privateFields);
}
@Override
public boolean equals(Object obj)
{
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
CacheControl other = (CacheControl) obj;
return Objects.equal(this.maxAge, other.maxAge) &&
Objects.equal(this.sMaxAge, other.sMaxAge) &&
Objects.equal(this.isPrivate, other.isPrivate) &&
Objects.equal(this.noCache, other.noCache) &&
Objects.equal(this.noStore, other.noStore) &&
Objects.equal(this.noTransform, other.noTransform) &&
Objects.equal(this.mustRevalidate, other.mustRevalidate) &&
Objects.equal(this.proxyRevalidate, other.proxyRevalidate) &&
Objects.equal(this.cacheExtensions, other.cacheExtensions) &&
Objects.equal(this.noCacheFields, other.noCacheFields) &&
Objects.equal(this.privateFields, other.privateFields);
}
}
