/*
* 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.tomcat.util.http;
import java.io.Serializable;
import java.text.FieldPosition;
import java.util.Date;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.DateTool;
import org.apache.tomcat.util.buf.MessageBytes;
/**
* Server-side cookie representation.
* Allows recycling and uses MessageBytes as low-level
* representation ( and thus the byte-> char conversion can be delayed
* until we know the charset ).
*
* Tomcat.core uses this recyclable object to represent cookies,
* and the facade will convert it to the external representation.
*/
public class ServerCookie implements Serializable {
protected static final boolean USE_V1_COOKIES =
!Boolean.valueOf(System.getProperty("org.apache.catalina.STRICT_SERVLET_COMPLIANCE", "false")).booleanValue();
// Version 0 (Netscape) attributes
private MessageBytes name=MessageBytes.newInstance();
private MessageBytes value=MessageBytes.newInstance();
// Expires - Not stored explicitly. Generated from Max-Age (see V1)
private MessageBytes path=MessageBytes.newInstance();
private MessageBytes domain=MessageBytes.newInstance();
private boolean secure;
// Version 1 (RFC2109) attributes
private MessageBytes comment=MessageBytes.newInstance();
private int maxAge = -1;
private int version = 0;
// Note: Servlet Spec =< 2.5 only refers to Netscape and RFC2109,
// not RFC2965
// Version 1 (RFC2965) attributes
// TODO Add support for CommentURL
// Discard - implied by maxAge <0
// TODO Add support for Port
public ServerCookie() {
}
public void recycle() {
path.recycle();
name.recycle();
value.recycle();
comment.recycle();
maxAge=-1;
path.recycle();
domain.recycle();
version=0;
secure=false;
}
public MessageBytes getComment() {
return comment;
}
public MessageBytes getDomain() {
return domain;
}
public void setMaxAge(int expiry) {
maxAge = expiry;
}
public int getMaxAge() {
return maxAge;
}
public MessageBytes getPath() {
return path;
}
public void setSecure(boolean flag) {
secure = flag;
}
public boolean getSecure() {
return secure;
}
public MessageBytes getName() {
return name;
}
public MessageBytes getValue() {
return value;
}
public int getVersion() {
return version;
}
public void setVersion(int v) {
version = v;
}
// -------------------- utils --------------------
public String toString() {
return "Cookie " + getName() + "=" + getValue() + " ; "
+ getVersion() + " " + getPath() + " " + getDomain();
}
private static final String tspecials = ",; ";
private static final String tspecials2 = "()<>@,;:\\\"/[]?={} \t";
/*
* Tests a string and returns true if the string counts as a
* reserved token in the Java language.
*
* @param value the <code>String</code> to be tested
*
* @return <code>true</code> if the <code>String</code> is a reserved
* token; <code>false</code> if it is not
*/
public static boolean isToken(String value) {
if( value==null) return true;
int len = value.length();
for (int i = 0; i < len; i++) {
char c = value.charAt(i);
if (tspecials.indexOf(c) != -1)
return false;
}
return true;
}
public static boolean containsCTL(String value, int version) {
if( value==null) return false;
int len = value.length();
for (int i = 0; i < len; i++) {
char c = value.charAt(i);
if (c < 0x20 || c >= 0x7f) {
if (c == 0x09)
continue; //allow horizontal tabs
return true;
}
}
return false;
}
public static boolean isToken2(String value) {
if( value==null) return true;
int len = value.length();
for (int i = 0; i < len; i++) {
char c = value.charAt(i);
if (tspecials2.indexOf(c) != -1)
return false;
}
return true;
}
/**
* @deprecated - Not used
*/
public static boolean checkName( String name ) {
if (!isToken(name)
|| name.equalsIgnoreCase("Comment") // rfc2019
|| name.equalsIgnoreCase("Discard") // rfc2965
|| name.equalsIgnoreCase("Domain") // rfc2019
|| name.equalsIgnoreCase("Expires") // Netscape
|| name.equalsIgnoreCase("Max-Age") // rfc2019
|| name.equalsIgnoreCase("Path") // rfc2019
|| name.equalsIgnoreCase("Secure") // rfc2019
|| name.equalsIgnoreCase("Version") // rfc2019
// TODO remaining RFC2965 attributes
) {
return false;
}
return true;
}
// -------------------- Cookie parsing tools
/**
* Return the header name to set the cookie, based on cookie version.
*/
public String getCookieHeaderName() {
return getCookieHeaderName(version);
}
/**
* Return the header name to set the cookie, based on cookie version.
*/
public static String getCookieHeaderName(int version) {
// TODO Re-enable logging when RFC2965 is implemented
// log( (version==1) ? "Set-Cookie2" : "Set-Cookie");
if (version == 1) {
// XXX RFC2965 not referenced in Servlet Spec
// Set-Cookie2 is not supported by Netscape 4, 6, IE 3, 5
// Set-Cookie2 is supported by Lynx and Opera
// Need to check on later IE and FF releases but for now...
// RFC2109
return "Set-Cookie";
// return "Set-Cookie2";
} else {
// Old Netscape
return "Set-Cookie";
}
}
private static final String ancientDate =
DateTool.formatOldCookie(new Date(10000));
// TODO RFC2965 fields also need to be passed
public static void appendCookieValue( StringBuffer headerBuf,
int version,
String name,
String value,
String path,
String domain,
String comment,
int maxAge,
boolean isSecure )
{
StringBuffer buf = new StringBuffer();
// Servlet implementation checks name
buf.append( name );
buf.append("=");
// Servlet implementation does not check anything else
version = maybeQuote2(version, buf, value);
// Add version 1 specific information
if (version == 1) {
// Version=1 ... required
buf.append ("; Version=1");
// Comment=comment
if ( comment!=null ) {
buf.append ("; Comment=");
maybeQuote2(version, buf, comment);
}
}
// Add domain information, if present
if (domain!=null) {
buf.append("; Domain=");
maybeQuote2(version, buf, domain);
}
// Max-Age=secs ... or use old "Expires" format
// TODO RFC2965 Discard
if (maxAge >= 0) {
if (version == 0) {
// Wdy, DD-Mon-YY HH:MM:SS GMT ( Expires Netscape format )
buf.append ("; Expires=");
// To expire immediately we need to set the time in past
if (maxAge == 0)
buf.append( ancientDate );
else
DateTool.formatOldCookie
(new Date( System.currentTimeMillis() +
maxAge *1000L), buf,
new FieldPosition(0));
} else {
buf.append ("; Max-Age=");
buf.append (maxAge);
}
}
// Path=path
if (path!=null) {
buf.append ("; Path=");
if (version > 0) {
// Don't quote the path for v0 cookies
maybeQuote2(version, buf, path);
} else {
buf.append(path);
}
}
// Secure
if (isSecure) {
buf.append ("; Secure");
}
headerBuf.append(buf);
}
/**
* @deprecated - Not used
*/
@Deprecated
public static void maybeQuote (int version, StringBuffer buf,String value) {
// special case - a \n or \r shouldn't happen in any case
if (isToken(value)) {
buf.append(value);
} else {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
}
}
public static boolean alreadyQuoted (String value) {
if (value==null || value.length()==0) return false;
return (value.charAt(0)=='\"' && value.charAt(value.length()-1)=='\"');
}
/**
* Quotes values using rules that vary depending on Cookie version.
* @param version
* @param buf
* @param value
*/
public static int maybeQuote2 (int version, StringBuffer buf, String value) {
if (value==null || value.length()==0) {
buf.append("\"\"");
}else if (containsCTL(value,version))
throw new IllegalArgumentException("Control character in cookie value, consider BASE64 encoding your value");
else if (alreadyQuoted(value)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,1,value.length()-1));
buf.append('"');
} else if (USE_V1_COOKIES && version==0 && !isToken2(value)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
version = 1;
} else if (version==0 && !isToken(value)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
} else if (version==1 && !isToken2(value)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
} else {
buf.append(value);
}
return version;
}
/**
* Escapes any double quotes in the given string.
*
* @param s the input string
* @param beginIndex start index inclusive
* @param endIndex exclusive
* @return The (possibly) escaped string
*/
private static String escapeDoubleQuotes(String s, int beginIndex, int endIndex) {
if (s == null || s.length() == 0 || s.indexOf('"') == -1) {
return s;
}
StringBuffer b = new StringBuffer();
for (int i = beginIndex; i < endIndex; i++) {
char c = s.charAt(i);
if (c == '\\' ) {
b.append(c);
//ignore the character after an escape, just append it
if (++i>=endIndex) throw new IllegalArgumentException("Invalid escape character in cookie value.");
b.append(s.charAt(i));
} else if (c == '"')
b.append('\\').append('"');
else
b.append(c);
}
return b.toString();
}
/**
* Unescapes any double quotes in the given cookie value.
*
* @param bc The cookie value to modify
*/
public static void unescapeDoubleQuotes(ByteChunk bc) {
if (bc == null || bc.getLength() == 0 || bc.indexOf('"', 0) == -1) {
return;
}
int src = bc.getStart();
int end = bc.getEnd();
int dest = src;
byte[] buffer = bc.getBuffer();
while (src < end) {
if (buffer[src] == '\\' && src < end && buffer[src+1] == '"') {
src++;
}
buffer[dest] = buffer[src];
dest ++;
src ++;
}
bc.setEnd(dest);
}
}