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Java example source code file (CookieUtil.java)

This example Java source code file (CookieUtil.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bitset, charsequence, cookieutil, deprecated, dquote, util, valid_cookie_name_octets, valid_cookie_value_octets

The CookieUtil.java Java example source code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.codec.http;

import java.util.BitSet;

/**
 * @deprecated Duplicate of package private ${@link io.netty.handler.codec.http.cookie.CookieUtil}
 */
@Deprecated
final class CookieUtil {

    private static final BitSet VALID_COOKIE_VALUE_OCTETS = validCookieValueOctets();

    private static final BitSet VALID_COOKIE_NAME_OCTETS = validCookieNameOctets(VALID_COOKIE_VALUE_OCTETS);

    // US-ASCII characters excluding CTLs, whitespace, DQUOTE, comma, semicolon, and backslash
    private static BitSet validCookieValueOctets() {
        BitSet bits = new BitSet(8);
        for (int i = 35; i < 127; i++) {
            // US-ASCII characters excluding CTLs (%x00-1F / %x7F)
            bits.set(i);
        }
        bits.set('"', false);  // exclude DQUOTE = %x22
        bits.set(',', false);  // exclude comma = %x2C
        bits.set(';', false);  // exclude semicolon = %x3B
        bits.set('\\', false); // exclude backslash = %x5C
        return bits;
    }

    //    token          = 1*<any CHAR except CTLs or separators>
    //    separators     = "(" | ")" | "<" | ">" | "@"
    //                   | "," | ";" | ":" | "\" | <">
    //                   | "/" | "[" | "]" | "?" | "="
    //                   | "{" | "}" | SP | HT
    private static BitSet validCookieNameOctets(BitSet validCookieValueOctets) {
        BitSet bits = new BitSet(8);
        bits.or(validCookieValueOctets);
        bits.set('(', false);
        bits.set(')', false);
        bits.set('<', false);
        bits.set('>', false);
        bits.set('@', false);
        bits.set(':', false);
        bits.set('/', false);
        bits.set('[', false);
        bits.set(']', false);
        bits.set('?', false);
        bits.set('=', false);
        bits.set('{', false);
        bits.set('}', false);
        bits.set(' ', false);
        bits.set('\t', false);
        return bits;
    }

    static int firstInvalidCookieNameOctet(CharSequence cs) {
        return firstInvalidOctet(cs, VALID_COOKIE_NAME_OCTETS);
    }

    static int firstInvalidCookieValueOctet(CharSequence cs) {
        return firstInvalidOctet(cs, VALID_COOKIE_VALUE_OCTETS);
    }

    static int firstInvalidOctet(CharSequence cs, BitSet bits) {
        for (int i = 0; i < cs.length(); i++) {
            char c = cs.charAt(i);
            if (!bits.get(c)) {
                return i;
            }
        }
        return -1;
    }

    static CharSequence unwrapValue(CharSequence cs) {
        final int len = cs.length();
        if (len > 0 && cs.charAt(0) == '"') {
            if (len >= 2 && cs.charAt(len - 1) == '"') {
                // properly balanced
                return len == 2 ? "" : cs.subSequence(1, len - 1);
            } else {
                return null;
            }
        }
        return cs;
    }

    private CookieUtil() {
        // Unused
    }
}

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