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com.firenio.baseio.codec.http11.CookieUtil Maven / Gradle / Ivy
/*
* Copyright 2015 The Baseio Project
*
* Licensed 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.firenio.baseio.codec.http11;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
public class CookieUtil {
private static final boolean ALWAYS_ADD_EXPIRES;
private static final String ancientDate;
private static final DateFormat OLD_COOKIE_PATTERN_FORMAT;
private static final boolean STRICT_SERVLET_COMPLIANCE;
private static final String tspecials = ",; ";
private static final String tspecials2 = "()<>@,;:\\\"/[]?={} \t";
private static final String tspecials2NoSlash = "()<>@,;:\\\"[]?={} \t";
static {
final String OLD_COOKIE_PATTERN = "EEE, dd-MMM-yyyy HH:mm:ss z";
OLD_COOKIE_PATTERN_FORMAT = new SimpleDateFormat(OLD_COOKIE_PATTERN, Locale.US);
OLD_COOKIE_PATTERN_FORMAT.setTimeZone(TimeZone.getTimeZone("GMT"));
ancientDate = OLD_COOKIE_PATTERN_FORMAT.format(new Date(10000));
STRICT_SERVLET_COMPLIANCE = false;
ALWAYS_ADD_EXPIRES = true;
}
private static boolean alreadyQuoted(String value) {
if (value == null || value.length() == 0) {
return false;
}
return (value.charAt(0) == '\"' && value.charAt(value.length() - 1) == '\"');
}
// TODO RFC2965 fields also need to be passed
public static void appendCookieValue(StringBuilder 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, true);
// 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) {
buf.append("; Max-Age=");
buf.append(maxAge);
}
// IE6, IE7 and possibly other browsers don't understand Max-Age.
// They do understand Expires, even with V1 cookies!
if (version == 0 || ALWAYS_ADD_EXPIRES) {
// 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 {
OLD_COOKIE_PATTERN_FORMAT.format(
new Date(System.currentTimeMillis() + maxAge * 1000L), buf,
new FieldPosition(0));
}
}
}
// Path=path
if (path != null) {
buf.append("; Path=");
if (version == 0) {
maybeQuote2(version, buf, path);
} else {
maybeQuote2(version, buf, path, CookieUtil.tspecials2NoSlash, false);
}
}
// Secure
if (isSecure) {
buf.append("; Secure");
}
headerBuf.append(buf);
}
private 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;
}
// -------------------- Cookie parsing tools
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();
}
private static boolean isToken(String value, String literals) {
String tspecials = (literals == null ? CookieUtil.tspecials : literals);
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;
}
private static boolean isToken2(String value, String literals) {
String tspecials2 = (literals == null ? CookieUtil.tspecials2 : literals);
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;
}
private static int maybeQuote2(int version, StringBuffer buf, String value) {
return maybeQuote2(version, buf, value, false);
}
private static int maybeQuote2(int version, StringBuffer buf, String value,
boolean allowVersionSwitch) {
return maybeQuote2(version, buf, value, null, allowVersionSwitch);
}
private static int maybeQuote2(int version, StringBuffer buf, String value, String literals,
boolean allowVersionSwitch) {
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 (allowVersionSwitch && (!STRICT_SERVLET_COMPLIANCE) && version == 0
&& !isToken2(value, literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value, 0, value.length()));
buf.append('"');
version = 1;
} else if (version == 0 && !isToken(value, literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value, 0, value.length()));
buf.append('"');
} else if (version == 1 && !isToken2(value, literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value, 0, value.length()));
buf.append('"');
} else {
buf.append(value);
}
return version;
}
}
