001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.captcha;
016    
017    import com.liferay.portal.kernel.captcha.Captcha;
018    import com.liferay.portal.kernel.captcha.CaptchaException;
019    import com.liferay.portal.kernel.log.Log;
020    import com.liferay.portal.kernel.log.LogFactoryUtil;
021    import com.liferay.portal.kernel.security.pacl.DoPrivileged;
022    import com.liferay.portal.kernel.util.ClassUtil;
023    import com.liferay.portal.kernel.util.InstanceFactory;
024    import com.liferay.portal.kernel.util.PropsKeys;
025    import com.liferay.portal.util.ClassLoaderUtil;
026    import com.liferay.portal.util.PrefsPropsUtil;
027    import com.liferay.portal.util.PropsValues;
028    
029    import java.io.IOException;
030    
031    import javax.portlet.PortletRequest;
032    import javax.portlet.ResourceRequest;
033    import javax.portlet.ResourceResponse;
034    
035    import javax.servlet.http.HttpServletRequest;
036    import javax.servlet.http.HttpServletResponse;
037    
038    /**
039     * @author Brian Wing Shun Chan
040     */
041    @DoPrivileged
042    public class CaptchaImpl implements Captcha {
043    
044            public void check(HttpServletRequest request) throws CaptchaException {
045                    _initialize();
046    
047                    _captcha.check(request);
048            }
049    
050            public void check(PortletRequest portletRequest) throws CaptchaException {
051                    _initialize();
052    
053                    _captcha.check(portletRequest);
054            }
055    
056            public String getTaglibPath() {
057                    _initialize();
058    
059                    return _captcha.getTaglibPath();
060            }
061    
062            public boolean isEnabled(HttpServletRequest request)
063                    throws CaptchaException {
064    
065                    _initialize();
066    
067                    return _captcha.isEnabled(request);
068            }
069    
070            public boolean isEnabled(PortletRequest portletRequest)
071                    throws CaptchaException {
072    
073                    _initialize();
074    
075                    return _captcha.isEnabled(portletRequest);
076            }
077    
078            public void serveImage(
079                            HttpServletRequest request, HttpServletResponse response)
080                    throws IOException {
081    
082                    _initialize();
083    
084                    _captcha.serveImage(request, response);
085            }
086    
087            public void serveImage(
088                            ResourceRequest resourceRequest, ResourceResponse resourceResponse)
089                    throws IOException {
090    
091                    _initialize();
092    
093                    _captcha.serveImage(resourceRequest, resourceResponse);
094            }
095    
096            public void setCaptcha(Captcha captcha) {
097                    _initialize();
098    
099                    if (captcha == null) {
100                            if (_log.isInfoEnabled()) {
101                                    _log.info(
102                                            "Restoring " + ClassUtil.getClassName(_originalCaptcha));
103                            }
104    
105                            _captcha = _originalCaptcha;
106                    }
107                    else {
108                            if (_log.isInfoEnabled()) {
109                                    _log.info("Setting " + ClassUtil.getClassName(captcha));
110                            }
111    
112                            _captcha = captcha;
113                    }
114            }
115    
116            private void _initialize() {
117                    if (_captcha != null) {
118                            return;
119                    }
120    
121                    synchronized (this) {
122                            if (_captcha != null) {
123                                    return;
124                            }
125    
126                            try {
127                                    String captchaClassName = PrefsPropsUtil.getString(
128                                            PropsKeys.CAPTCHA_ENGINE_IMPL,
129                                            PropsValues.CAPTCHA_ENGINE_IMPL);
130    
131                                    if (_log.isInfoEnabled()) {
132                                            _log.info("Initializing " + captchaClassName);
133                                    }
134    
135                                    _captcha = (Captcha)InstanceFactory.newInstance(
136                                            ClassLoaderUtil.getPortalClassLoader(), captchaClassName);
137    
138                                    _originalCaptcha = _captcha;
139                            }
140                            catch (Exception e) {
141                                    _log.error(e, e);
142                            }
143                    }
144            }
145    
146            private static Log _log = LogFactoryUtil.getLog(CaptchaImpl.class);
147    
148            private volatile Captcha _captcha;
149            private Captcha _originalCaptcha;
150    
151    }