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.portlet.blogs.action;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.servlet.ServletResponseUtil;
020    import com.liferay.portal.kernel.util.ContentTypes;
021    import com.liferay.portal.kernel.util.GetterUtil;
022    import com.liferay.portal.kernel.util.HttpUtil;
023    import com.liferay.portal.kernel.util.ParamUtil;
024    import com.liferay.portal.kernel.util.StringBundler;
025    import com.liferay.portal.kernel.util.StringPool;
026    import com.liferay.portal.kernel.util.Validator;
027    import com.liferay.portal.kernel.workflow.WorkflowConstants;
028    import com.liferay.portal.security.auth.PrincipalException;
029    import com.liferay.portal.service.ServiceContext;
030    import com.liferay.portal.service.ServiceContextFactory;
031    import com.liferay.portal.service.UserLocalServiceUtil;
032    import com.liferay.portal.struts.ActionConstants;
033    import com.liferay.portal.struts.PortletAction;
034    import com.liferay.portal.theme.ThemeDisplay;
035    import com.liferay.portal.util.Portal;
036    import com.liferay.portal.util.PortalUtil;
037    import com.liferay.portal.util.WebKeys;
038    import com.liferay.portlet.PortletPreferencesFactoryUtil;
039    import com.liferay.portlet.blogs.NoSuchEntryException;
040    import com.liferay.portlet.blogs.model.BlogsEntry;
041    import com.liferay.portlet.blogs.util.LinkbackConsumerUtil;
042    import com.liferay.portlet.messageboards.model.MBMessage;
043    import com.liferay.portlet.messageboards.model.MBMessageDisplay;
044    import com.liferay.portlet.messageboards.model.MBThread;
045    import com.liferay.portlet.messageboards.service.MBMessageLocalServiceUtil;
046    
047    import javax.portlet.ActionRequest;
048    import javax.portlet.ActionResponse;
049    import javax.portlet.PortletConfig;
050    import javax.portlet.PortletPreferences;
051    
052    import javax.servlet.http.HttpServletRequest;
053    import javax.servlet.http.HttpServletResponse;
054    
055    import org.apache.struts.action.ActionForm;
056    import org.apache.struts.action.ActionMapping;
057    
058    /**
059     * @author Alexander Chow
060     */
061    public class TrackbackAction extends PortletAction {
062    
063            @Override
064            public void processAction(
065                            ActionMapping mapping, ActionForm form, PortletConfig portletConfig,
066                            ActionRequest actionRequest, ActionResponse actionResponse)
067                    throws Exception {
068    
069                    try {
070                            addTrackback(actionRequest, actionResponse);
071                    }
072                    catch (NoSuchEntryException nsee) {
073                            if (_log.isWarnEnabled()) {
074                                    _log.warn(nsee, nsee);
075                            }
076                    }
077                    catch (Exception e) {
078                            _log.error(e, e);
079                    }
080    
081                    setForward(actionRequest, ActionConstants.COMMON_NULL);
082            }
083    
084            protected void addTrackback(
085                            ActionRequest actionRequest, ActionResponse actionResponse)
086                    throws Exception {
087    
088                    ThemeDisplay themeDisplay = (ThemeDisplay)actionRequest.getAttribute(
089                            WebKeys.THEME_DISPLAY);
090    
091                    String title = ParamUtil.getString(actionRequest, "title");
092                    String excerpt = ParamUtil.getString(actionRequest, "excerpt");
093                    String url = ParamUtil.getString(actionRequest, "url");
094                    String blogName = ParamUtil.getString(actionRequest, "blog_name");
095    
096                    if (!isCommentsEnabled(actionRequest)) {
097                            sendError(
098                                    actionRequest, actionResponse,
099                                    "Comments have been disabled for this blog entry.");
100    
101                            return;
102                    }
103    
104                    if (Validator.isNull(url)) {
105                            sendError(
106                                    actionRequest, actionResponse,
107                                    "Trackback requires a valid permanent URL.");
108    
109                            return;
110                    }
111    
112                    HttpServletRequest request = PortalUtil.getHttpServletRequest(
113                            actionRequest);
114    
115                    String remoteIp = request.getRemoteAddr();
116    
117                    String trackbackIp = HttpUtil.getIpAddress(url);
118    
119                    if (!remoteIp.equals(trackbackIp)) {
120                            sendError(
121                                    actionRequest, actionResponse,
122                                    "Remote IP " + remoteIp +
123                                            " does not match trackback URL's IP " + trackbackIp + ".");
124    
125                            return;
126                    }
127    
128                    try {
129                            ActionUtil.getEntry(actionRequest);
130                    }
131                    catch (PrincipalException pe) {
132                            sendError(
133                                    actionRequest, actionResponse,
134                                    "Blog entry must have guest view permissions to enable " +
135                                            "trackbacks.");
136    
137                            return;
138                    }
139    
140                    BlogsEntry entry = (BlogsEntry)actionRequest.getAttribute(
141                            WebKeys.BLOGS_ENTRY);
142    
143                    if (!entry.isAllowTrackbacks()) {
144                            sendError(
145                                    actionRequest, actionResponse,
146                                    "Trackbacks are not enabled on this blog entry.");
147    
148                            return;
149                    }
150    
151                    long userId = UserLocalServiceUtil.getDefaultUserId(
152                            themeDisplay.getCompanyId());
153                    long groupId = entry.getGroupId();
154                    String className = BlogsEntry.class.getName();
155                    long classPK = entry.getEntryId();
156    
157                    MBMessageDisplay messageDisplay =
158                            MBMessageLocalServiceUtil.getDiscussionMessageDisplay(
159                                    userId, groupId, className, classPK,
160                                    WorkflowConstants.STATUS_APPROVED);
161    
162                    MBThread thread = messageDisplay.getThread();
163    
164                    long threadId = thread.getThreadId();
165                    long parentMessageId = thread.getRootMessageId();
166                    String body =
167                            "[...] " + excerpt + " [...] [url=" + url + "]" +
168                                    themeDisplay.translate("read-more") + "[/url]";
169    
170                    ServiceContext serviceContext = ServiceContextFactory.getInstance(
171                            MBMessage.class.getName(), actionRequest);
172    
173                    MBMessage message = MBMessageLocalServiceUtil.addDiscussionMessage(
174                            userId, blogName, groupId, className, classPK, threadId,
175                            parentMessageId, title, body, serviceContext);
176    
177                    String entryURL =
178                            PortalUtil.getLayoutFullURL(themeDisplay) +
179                                    Portal.FRIENDLY_URL_SEPARATOR + "blogs/" + entry.getUrlTitle();
180    
181                    LinkbackConsumerUtil.addNewTrackback(
182                            message.getMessageId(), url, entryURL);
183    
184                    sendSuccess(actionRequest, actionResponse);
185            }
186    
187            @Override
188            protected boolean isCheckMethodOnProcessAction() {
189                    return _CHECK_METHOD_ON_PROCESS_ACTION;
190            }
191    
192            protected boolean isCommentsEnabled(ActionRequest actionRequest)
193                    throws Exception {
194    
195                    PortletPreferences preferences = actionRequest.getPreferences();
196    
197                    String portletResource = ParamUtil.getString(
198                            actionRequest, "portletResource");
199    
200                    if (Validator.isNotNull(portletResource)) {
201                            preferences = PortletPreferencesFactoryUtil.getPortletSetup(
202                                    actionRequest, portletResource);
203                    }
204    
205                    return GetterUtil.getBoolean(
206                            preferences.getValue("enableComments", null), true);
207            }
208    
209            protected void sendError(
210                            ActionRequest actionRequest, ActionResponse actionResponse,
211                            String msg)
212                    throws Exception {
213    
214                    sendResponse(actionRequest, actionResponse, msg, false);
215            }
216    
217            protected void sendResponse(
218                            ActionRequest actionRequest, ActionResponse actionResponse,
219                            String msg, boolean success)
220                    throws Exception {
221    
222                    StringBundler sb = new StringBundler(7);
223    
224                    sb.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
225                    sb.append("<response>");
226    
227                    if (success) {
228                            sb.append("<error>0</error>");
229                    }
230                    else {
231                            sb.append("<error>1</error>");
232                            sb.append("<message>");
233                            sb.append(msg);
234                            sb.append("</message>");
235                    }
236    
237                    sb.append("</response>");
238    
239                    HttpServletRequest request = PortalUtil.getHttpServletRequest(
240                            actionRequest);
241                    HttpServletResponse response = PortalUtil.getHttpServletResponse(
242                            actionResponse);
243    
244                    ServletResponseUtil.sendFile(
245                            request, response, null, sb.toString().getBytes(StringPool.UTF8),
246                            ContentTypes.TEXT_XML_UTF8);
247            }
248    
249            protected void sendSuccess(
250                            ActionRequest actionRequest, ActionResponse actionResponse)
251                    throws Exception {
252    
253                    sendResponse(actionRequest, actionResponse, null, true);
254            }
255    
256            private static final boolean _CHECK_METHOD_ON_PROCESS_ACTION = false;
257    
258            private static Log _log = LogFactoryUtil.getLog(TrackbackAction.class);
259    
260    }