Play Framework/Scala example source code file (CookieDecoder.java)

This example Play Framework source code file (CookieDecoder.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Play Framework (and Scala) source code examples by using tags.

All credit for the original source code belongs to Play Framework; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Play Framework tags/keywords

arraylist, comma, cookie, cookiedecoder, core, deprecated, list, netty, numberformatexception, parseexception, play, play framework, set, string, utility, utils

The CookieDecoder.java Play Framework example source code

/*
 * Copyright 2012 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 play.core.netty.utils;

import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

/**
 * Decodes an HTTP header value into {@link Cookie}s.  This decoder can decode
 * the HTTP cookie version 0, 1, and 2.
 *
 * <pre>
 * {@link HttpRequest} req = ...;
 * String value = req.getHeader("Cookie");
 * Set<{@link Cookie}> cookies = new {@link CookieDecoder}().decode(value);
 * </pre>
 *
 * @see CookieEncoder
 *
 * @apiviz.stereotype utility
 * @apiviz.has        org.jboss.netty.handler.codec.http.Cookie oneway - - decodes
 */
public class CookieDecoder {

    private static final char COMMA = ',';

    /**
     * Creates a new decoder.
     */
    public CookieDecoder() {
    }

    /**
     * @deprecated Use {@link #CookieDecoder()} instead.
     */
    @Deprecated
    public CookieDecoder(@SuppressWarnings("unused") boolean lenient) {
    }

    /**
     * Decodes the specified HTTP header value into {@link Cookie}s.
     *
     * @return the decoded {@link Cookie}s
     */
    public Set<Cookie> decode(String header) {
        List<String> names = new ArrayList<String>(8);
        List<String> values = new ArrayList<String>(8);
        extractKeyValuePairs(header, names, values);

        if (names.isEmpty()) {
            return Collections.emptySet();
        }

        int i;
        int version = 0;

        // $Version is the only attribute that can appear before the actual
        // cookie name-value pair.
        if (names.get(0).equalsIgnoreCase(CookieHeaderNames.VERSION)) {
            try {
                version = Integer.parseInt(values.get(0));
            } catch (NumberFormatException e) {
                // Ignore.
            }
            i = 1;
        } else {
            i = 0;
        }

        if (names.size() <= i) {
            // There's a version attribute, but nothing more.
            return Collections.emptySet();
        }

        Set<Cookie> cookies = new TreeSet<Cookie>();
        for (; i < names.size(); i ++) {
            String name = names.get(i);
            String value = values.get(i);
            if (value == null) {
                value = "";
            }

            Cookie c = new DefaultCookie(name, value);

            boolean discard = false;
            boolean secure = false;
            boolean httpOnly = false;
            String comment = null;
            String commentURL = null;
            String domain = null;
            String path = null;
            int maxAge = Integer.MIN_VALUE;
            List<Integer> ports = new ArrayList<Integer>(2);

            for (int j = i + 1; j < names.size(); j++, i++) {
                name = names.get(j);
                value = values.get(j);

                if (CookieHeaderNames.DISCARD.equalsIgnoreCase(name)) {
                    discard = true;
                } else if (CookieHeaderNames.SECURE.equalsIgnoreCase(name)) {
                    secure = true;
                } else if (CookieHeaderNames.HTTPONLY.equalsIgnoreCase(name)) {
                   httpOnly = true;
                } else if (CookieHeaderNames.COMMENT.equalsIgnoreCase(name)) {
                    comment = value;
                } else if (CookieHeaderNames.COMMENTURL.equalsIgnoreCase(name)) {
                    commentURL = value;
                } else if (CookieHeaderNames.DOMAIN.equalsIgnoreCase(name)) {
                    domain = value;
                } else if (CookieHeaderNames.PATH.equalsIgnoreCase(name)) {
                    path = value;
                } else if (CookieHeaderNames.EXPIRES.equalsIgnoreCase(name)) {
                    try {
                        long maxAgeMillis =
                            HttpHeaderDateFormat.get().parse(value).getTime() -
                            System.currentTimeMillis();

                        maxAge = (int) (maxAgeMillis / 1000) +
                                 (maxAgeMillis % 1000 != 0? 1 : 0);

                    } catch (ParseException e) {
                        // Ignore.
                    }
                } else if (CookieHeaderNames.MAX_AGE.equalsIgnoreCase(name)) {
                    maxAge = Integer.parseInt(value);
                } else if (CookieHeaderNames.VERSION.equalsIgnoreCase(name)) {
                    version = Integer.parseInt(value);
                } else if (CookieHeaderNames.PORT.equalsIgnoreCase(name)) {
                    String[] portList = StringUtil.split(value, COMMA);
                    for (String s1: portList) {
                        try {
                            ports.add(Integer.valueOf(s1));
                        } catch (NumberFormatException e) {
                            // Ignore.
                        }
                    }
                } else {
                    break;
                }
            }

            c.setVersion(version);
            c.setMaxAge(maxAge);
            c.setPath(path);
            c.setDomain(domain);
            c.setSecure(secure);
            c.setHttpOnly(httpOnly);
            if (version > 0) {
                c.setComment(comment);
            }
            if (version > 1) {
                c.setCommentUrl(commentURL);
                c.setPorts(ports);
                c.setDiscard(discard);
            }

            cookies.add(c);
        }

        return cookies;
    }

    private static void extractKeyValuePairs(
            final String header, final List<String> names, final List<String> values) {

        final int headerLen  = header.length();
        loop: for (int i = 0;;) {

            // Skip spaces and separators.
            for (;;) {
                if (i == headerLen) {
                    break loop;
                }
                switch (header.charAt(i)) {
                case '\t': case '\n': case 0x0b: case '\f': case '\r':
                case ' ':  case ',':  case ';':
                    i ++;
                    continue;
                }
                break;
            }

            // Skip '$'.
            for (;;) {
                if (i == headerLen) {
                    break loop;
                }
                if (header.charAt(i) == '$') {
                    i ++;
                    continue;
                }
                break;
            }

            String name;
            String value;

            if (i == headerLen) {
                name = null;
                value = null;
            } else {
                int newNameStart = i;
                keyValLoop: for (;;) {
                    switch (header.charAt(i)) {
                    case ';':
                        // NAME; (no value till ';')
                        name = header.substring(newNameStart, i);
                        value = null;
                        break keyValLoop;
                    case '=':
                        // NAME=VALUE
                        name = header.substring(newNameStart, i);
                        i ++;
                        if (i == headerLen) {
                            // NAME= (empty value, i.e. nothing after '=')
                            value = "";
                            break keyValLoop;
                        }

                        int newValueStart = i;
                        char c = header.charAt(i);
                        if (c == '"' || c == '\'') {
                            // NAME="VALUE" or NAME='VALUE'
                            StringBuilder newValueBuf = new StringBuilder(header.length() - i);
                            final char q = c;
                            boolean hadBackslash = false;
                            i ++;
                            for (;;) {
                                if (i == headerLen) {
                                    value = newValueBuf.toString();
                                    break keyValLoop;
                                }
                                if (hadBackslash) {
                                    hadBackslash = false;
                                    c = header.charAt(i ++);
                                    switch (c) {
                                    case '\\': case '"': case '\'':
                                        // Escape last backslash.
                                        newValueBuf.setCharAt(newValueBuf.length() - 1, c);
                                        break;
                                    default:
                                        // Do not escape last backslash.
                                        newValueBuf.append(c);
                                    }
                                } else {
                                    c = header.charAt(i ++);
                                    if (c == q) {
                                        value = newValueBuf.toString();
                                        break keyValLoop;
                                    }
                                    newValueBuf.append(c);
                                    if (c == '\\') {
                                        hadBackslash = true;
                                    }
                                }
                            }
                        } else {
                            // NAME=VALUE;
                            int semiPos = header.indexOf(';', i);
                            if (semiPos > 0) {
                                value = header.substring(newValueStart, semiPos);
                                i = semiPos;
                            } else {
                                value = header.substring(newValueStart);
                                i = headerLen;
                            }
                        }
                        break keyValLoop;
                    default:
                        i ++;
                    }

                    if (i == headerLen) {
                        // NAME (no value till the end of string)
                        name = header.substring(newNameStart);
                        value = null;
                        break;
                    }
                }
            }

            names.add(name);
            values.add(value);
        }
    }
}