001    /**
002     * Copyright (c) 2000-2012 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.util.ClassUtil;
022    import com.liferay.portal.kernel.util.InstanceFactory;
023    import com.liferay.portal.kernel.util.PropsKeys;
024    import com.liferay.portal.util.ClassLoaderUtil;
025    import com.liferay.portal.util.PrefsPropsUtil;
026    import com.liferay.portal.util.PropsValues;
027    
028    import java.io.IOException;
029    
030    import javax.portlet.PortletRequest;
031    import javax.portlet.ResourceRequest;
032    import javax.portlet.ResourceResponse;
033    
034    import javax.servlet.http.HttpServletRequest;
035    import javax.servlet.http.HttpServletResponse;
036    
037    /**
038     * @author Brian Wing Shun Chan
039     */
040    public class CaptchaImpl implements Captcha {
041    
042            public void check(HttpServletRequest request) throws CaptchaException {
043                    _initialize();
044    
045                    _captcha.check(request);
046            }
047    
048            public void check(PortletRequest portletRequest) throws CaptchaException {
049                    _initialize();
050    
051                    _captcha.check(portletRequest);
052            }
053    
054            public String getTaglibPath() {
055                    _initialize();
056    
057                    return _captcha.getTaglibPath();
058            }
059    
060            public boolean isEnabled(HttpServletRequest request)
061                    throws CaptchaException {
062    
063                    _initialize();
064    
065                    return _captcha.isEnabled(request);
066            }
067    
068            public boolean isEnabled(PortletRequest portletRequest)
069                    throws CaptchaException {
070    
071                    _initialize();
072    
073                    return _captcha.isEnabled(portletRequest);
074            }
075    
076            public void serveImage(
077                            HttpServletRequest request, HttpServletResponse response)
078                    throws IOException {
079    
080                    _initialize();
081    
082                    _captcha.serveImage(request, response);
083            }
084    
085            public void serveImage(
086                            ResourceRequest resourceRequest, ResourceResponse resourceResponse)
087                    throws IOException {
088    
089                    _initialize();
090    
091                    _captcha.serveImage(resourceRequest, resourceResponse);
092            }
093    
094            public void setCaptcha(Captcha captcha) {
095                    _initialize();
096    
097                    if (captcha == null) {
098                            if (_log.isInfoEnabled()) {
099                                    _log.info(
100                                            "Restoring " + ClassUtil.getClassName(_originalCaptcha));
101                            }
102    
103                            _captcha = _originalCaptcha;
104                    }
105                    else {
106                            if (_log.isInfoEnabled()) {
107                                    _log.info("Setting " + ClassUtil.getClassName(captcha));
108                            }
109    
110                            _captcha = captcha;
111                    }
112            }
113    
114            private void _initialize() {
115                    if (_captcha != null) {
116                            return;
117                    }
118    
119                    synchronized (this) {
120                            if (_captcha != null) {
121                                    return;
122                            }
123    
124                            try {
125                                    String captchaClassName = PrefsPropsUtil.getString(
126                                            PropsKeys.CAPTCHA_ENGINE_IMPL,
127                                            PropsValues.CAPTCHA_ENGINE_IMPL);
128    
129                                    if (_log.isInfoEnabled()) {
130                                            _log.info("Initializing " + captchaClassName);
131                                    }
132    
133                                    _captcha = (Captcha)InstanceFactory.newInstance(
134                                            ClassLoaderUtil.getPortalClassLoader(), captchaClassName);
135    
136                                    _originalCaptcha = _captcha;
137                            }
138                            catch (Exception e) {
139                                    _log.error(e, e);
140                            }
141                    }
142            }
143    
144            private static Log _log = LogFactoryUtil.getLog(CaptchaImpl.class);
145    
146            private volatile Captcha _captcha;
147            private Captcha _originalCaptcha;
148    
149    }