alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

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, illegalargumentexception, string, stringbuilder, util, valid_cookie_attribute_value_octets, 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.cookie;

import io.netty.handler.codec.http.HttpConstants;
import io.netty.util.internal.InternalThreadLocalMap;

import java.util.BitSet;

final class CookieUtil {

    private static final BitSet VALID_COOKIE_NAME_OCTETS = validCookieNameOctets();

    private static final BitSet VALID_COOKIE_VALUE_OCTETS = validCookieValueOctets();

    private static final BitSet VALID_COOKIE_ATTRIBUTE_VALUE_OCTETS = validCookieAttributeValueOctets();

    // token = 1*<any CHAR except CTLs or separators>
    // separators = "(" | ")" | "<" | ">" | "@"
    // | "," | ";" | ":" | "\" | <">
    // | "/" | "[" | "]" | "?" | "="
    // | "{" | "}" | SP | HT
    private static BitSet validCookieNameOctets() {
        BitSet bits = new BitSet();
        for (int i = 32; i < 127; i++) {
            bits.set(i);
        }
        int[] separators = new int[]
                { '(', ')', '<', '>', '@', ',', ';', ':', '\\', '"', '/', '[', ']', '?', '=', '{', '}', ' ', '\t' };
        for (int separator : separators) {
            bits.set(separator, false);
        }
        return bits;
    }

    // cookie-octet = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
    // US-ASCII characters excluding CTLs, whitespace, DQUOTE, comma, semicolon, and backslash
    private static BitSet validCookieValueOctets() {
        BitSet bits = new BitSet();
        bits.set(0x21);
        for (int i = 0x23; i <= 0x2B; i++) {
            bits.set(i);
        }
        for (int i = 0x2D; i <= 0x3A; i++) {
            bits.set(i);
        }
        for (int i = 0x3C; i <= 0x5B; i++) {
            bits.set(i);
        }
        for (int i = 0x5D; i <= 0x7E; i++) {
            bits.set(i);
        }
        return bits;
    }

    // path-value        = <any CHAR except CTLs or ";">
    private static BitSet validCookieAttributeValueOctets() {
        BitSet bits = new BitSet();
        for (int i = 32; i < 127; i++) {
            bits.set(i);
        }
        bits.set(';', false);
        return bits;
    }

    static StringBuilder stringBuilder() {
        return InternalThreadLocalMap.get().stringBuilder();
    }

    /**
     * @param buf a buffer where some cookies were maybe encoded
     * @return the buffer String without the trailing separator, or null if no cookie was appended.
     */
    static String stripTrailingSeparatorOrNull(StringBuilder buf) {
        return buf.length() == 0 ? null : stripTrailingSeparator(buf);
    }

    static String stripTrailingSeparator(StringBuilder buf) {
        if (buf.length() > 0) {
            buf.setLength(buf.length() - 2);
        }
        return buf.toString();
    }

    static void add(StringBuilder sb, String name, long val) {
        sb.append(name);
        sb.append((char) HttpConstants.EQUALS);
        sb.append(val);
        sb.append((char) HttpConstants.SEMICOLON);
        sb.append((char) HttpConstants.SP);
    }

    static void add(StringBuilder sb, String name, String val) {
        sb.append(name);
        sb.append((char) HttpConstants.EQUALS);
        sb.append(val);
        sb.append((char) HttpConstants.SEMICOLON);
        sb.append((char) HttpConstants.SP);
    }

    static void add(StringBuilder sb, String name) {
        sb.append(name);
        sb.append((char) HttpConstants.SEMICOLON);
        sb.append((char) HttpConstants.SP);
    }

    static void addQuoted(StringBuilder sb, String name, String val) {
        if (val == null) {
            val = "";
        }

        sb.append(name);
        sb.append((char) HttpConstants.EQUALS);
        sb.append((char) HttpConstants.DOUBLE_QUOTE);
        sb.append(val);
        sb.append((char) HttpConstants.DOUBLE_QUOTE);
        sb.append((char) HttpConstants.SEMICOLON);
        sb.append((char) HttpConstants.SP);
    }

    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;
    }

    static String validateAttributeValue(String name, String value) {
        if (value == null) {
            return null;
        }
        value = value.trim();
        if (value.isEmpty()) {
            return null;
        }
        int i = firstInvalidOctet(value, VALID_COOKIE_ATTRIBUTE_VALUE_OCTETS);
        if (i != -1) {
            throw new IllegalArgumentException(name + " contains the prohibited characters: " + value.charAt(i));
        }
        return value;
    }

    private CookieUtil() {
        // Unused
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java CookieUtil.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.