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.PortletResponse;
033    
034    import javax.servlet.http.HttpServletRequest;
035    import javax.servlet.http.HttpServletResponse;
036    
037    /**
038     * @author Brian Wing Shun Chan
039     */
040    @DoPrivileged
041    public class CaptchaImpl implements Captcha {
042    
043            @Override
044            public void check(HttpServletRequest request) throws CaptchaException {
045                    _initialize();
046    
047                    _captcha.check(request);
048            }
049    
050            @Override
051            public void check(PortletRequest portletRequest) throws CaptchaException {
052                    _initialize();
053    
054                    _captcha.check(portletRequest);
055            }
056    
057            @Override
058            public String getTaglibPath() {
059                    _initialize();
060    
061                    return _captcha.getTaglibPath();
062            }
063    
064            @Override
065            public boolean isEnabled(HttpServletRequest request)
066                    throws CaptchaException {
067    
068                    _initialize();
069    
070                    return _captcha.isEnabled(request);
071            }
072    
073            @Override
074            public boolean isEnabled(PortletRequest portletRequest)
075                    throws CaptchaException {
076    
077                    _initialize();
078    
079                    return _captcha.isEnabled(portletRequest);
080            }
081    
082            @Override
083            public void serveImage(
084                            HttpServletRequest request, HttpServletResponse response)
085                    throws IOException {
086    
087                    _initialize();
088    
089                    _captcha.serveImage(request, response);
090            }
091    
092            @Override
093            public void serveImage(
094                            PortletRequest portletRequest, PortletResponse portletResponse)
095                    throws IOException {
096    
097                    _initialize();
098    
099                    _captcha.serveImage(portletRequest, portletResponse);
100            }
101    
102            public void setCaptcha(Captcha captcha) {
103                    _initialize();
104    
105                    if (captcha == null) {
106                            if (_log.isInfoEnabled()) {
107                                    _log.info(
108                                            "Restoring " + ClassUtil.getClassName(_originalCaptcha));
109                            }
110    
111                            _captcha = _originalCaptcha;
112                    }
113                    else {
114                            if (_log.isInfoEnabled()) {
115                                    _log.info("Setting " + ClassUtil.getClassName(captcha));
116                            }
117    
118                            _captcha = captcha;
119                    }
120            }
121    
122            private void _initialize() {
123                    if (_captcha != null) {
124                            return;
125                    }
126    
127                    synchronized (this) {
128                            if (_captcha != null) {
129                                    return;
130                            }
131    
132                            try {
133                                    String captchaClassName = PrefsPropsUtil.getString(
134                                            PropsKeys.CAPTCHA_ENGINE_IMPL,
135                                            PropsValues.CAPTCHA_ENGINE_IMPL);
136    
137                                    if (_log.isInfoEnabled()) {
138                                            _log.info("Initializing " + captchaClassName);
139                                    }
140    
141                                    _captcha = (Captcha)InstanceFactory.newInstance(
142                                            ClassLoaderUtil.getPortalClassLoader(), captchaClassName);
143    
144                                    _originalCaptcha = _captcha;
145                            }
146                            catch (Exception e) {
147                                    _log.error(e, e);
148                            }
149                    }
150            }
151    
152            private static Log _log = LogFactoryUtil.getLog(CaptchaImpl.class);
153    
154            private volatile Captcha _captcha;
155            private Captcha _originalCaptcha;
156    
157    }