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            @Override
045            public void check(HttpServletRequest request) throws CaptchaException {
046                    _initialize();
047    
048                    _captcha.check(request);
049            }
050    
051            @Override
052            public void check(PortletRequest portletRequest) throws CaptchaException {
053                    _initialize();
054    
055                    _captcha.check(portletRequest);
056            }
057    
058            @Override
059            public String getTaglibPath() {
060                    _initialize();
061    
062                    return _captcha.getTaglibPath();
063            }
064    
065            @Override
066            public boolean isEnabled(HttpServletRequest request)
067                    throws CaptchaException {
068    
069                    _initialize();
070    
071                    return _captcha.isEnabled(request);
072            }
073    
074            @Override
075            public boolean isEnabled(PortletRequest portletRequest)
076                    throws CaptchaException {
077    
078                    _initialize();
079    
080                    return _captcha.isEnabled(portletRequest);
081            }
082    
083            @Override
084            public void serveImage(
085                            HttpServletRequest request, HttpServletResponse response)
086                    throws IOException {
087    
088                    _initialize();
089    
090                    _captcha.serveImage(request, response);
091            }
092    
093            @Override
094            public void serveImage(
095                            ResourceRequest resourceRequest, ResourceResponse resourceResponse)
096                    throws IOException {
097    
098                    _initialize();
099    
100                    _captcha.serveImage(resourceRequest, resourceResponse);
101            }
102    
103            public void setCaptcha(Captcha captcha) {
104                    _initialize();
105    
106                    if (captcha == null) {
107                            if (_log.isInfoEnabled()) {
108                                    _log.info(
109                                            "Restoring " + ClassUtil.getClassName(_originalCaptcha));
110                            }
111    
112                            _captcha = _originalCaptcha;
113                    }
114                    else {
115                            if (_log.isInfoEnabled()) {
116                                    _log.info("Setting " + ClassUtil.getClassName(captcha));
117                            }
118    
119                            _captcha = captcha;
120                    }
121            }
122    
123            private void _initialize() {
124                    if (_captcha != null) {
125                            return;
126                    }
127    
128                    synchronized (this) {
129                            if (_captcha != null) {
130                                    return;
131                            }
132    
133                            try {
134                                    String captchaClassName = PrefsPropsUtil.getString(
135                                            PropsKeys.CAPTCHA_ENGINE_IMPL,
136                                            PropsValues.CAPTCHA_ENGINE_IMPL);
137    
138                                    if (_log.isInfoEnabled()) {
139                                            _log.info("Initializing " + captchaClassName);
140                                    }
141    
142                                    _captcha = (Captcha)InstanceFactory.newInstance(
143                                            ClassLoaderUtil.getPortalClassLoader(), captchaClassName);
144    
145                                    _originalCaptcha = _captcha;
146                            }
147                            catch (Exception e) {
148                                    _log.error(e, e);
149                            }
150                    }
151            }
152    
153            private static Log _log = LogFactoryUtil.getLog(CaptchaImpl.class);
154    
155            private volatile Captcha _captcha;
156            private Captcha _originalCaptcha;
157    
158    }