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.documentlibrary.action;
016    
017    import com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream;
018    import com.liferay.portal.kernel.repository.model.FileEntry;
019    import com.liferay.portal.kernel.repository.model.FileVersion;
020    import com.liferay.portal.kernel.servlet.SessionErrors;
021    import com.liferay.portal.kernel.util.DiffResult;
022    import com.liferay.portal.kernel.util.DiffUtil;
023    import com.liferay.portal.kernel.util.HtmlUtil;
024    import com.liferay.portal.kernel.util.ParamUtil;
025    import com.liferay.portal.kernel.util.StringPool;
026    import com.liferay.portal.kernel.util.StringUtil;
027    import com.liferay.portal.security.auth.PrincipalException;
028    import com.liferay.portal.struts.PortletAction;
029    import com.liferay.portal.util.WebKeys;
030    import com.liferay.portlet.documentlibrary.NoSuchFileEntryException;
031    import com.liferay.portlet.documentlibrary.service.DLAppServiceUtil;
032    import com.liferay.portlet.documentlibrary.util.DLUtil;
033    import com.liferay.portlet.documentlibrary.util.DocumentConversionUtil;
034    
035    import java.io.FileInputStream;
036    import java.io.InputStream;
037    import java.io.InputStreamReader;
038    
039    import java.util.List;
040    
041    import javax.portlet.PortletConfig;
042    import javax.portlet.RenderRequest;
043    import javax.portlet.RenderResponse;
044    
045    import org.apache.struts.action.ActionForm;
046    import org.apache.struts.action.ActionForward;
047    import org.apache.struts.action.ActionMapping;
048    
049    /**
050     * @author Bruno Farache
051     */
052    public class CompareVersionsAction extends PortletAction {
053    
054            @Override
055            public ActionForward render(
056                            ActionMapping mapping, ActionForm form, PortletConfig portletConfig,
057                            RenderRequest renderRequest, RenderResponse renderResponse)
058                    throws Exception {
059    
060                    try {
061                            compareVersions(renderRequest);
062                    }
063                    catch (Exception e) {
064                            if (e instanceof NoSuchFileEntryException ||
065                                    e instanceof PrincipalException) {
066    
067                                    SessionErrors.add(renderRequest, e.getClass().getName());
068    
069                                    setForward(renderRequest, "portlet.document_library.error");
070                            }
071                            else {
072                                    throw e;
073                            }
074                    }
075    
076                    return mapping.findForward("portlet.document_library.compare_versions");
077            }
078    
079            protected void compareVersions(RenderRequest renderRequest)
080                    throws Exception {
081    
082                    long fileEntryId = ParamUtil.getLong(renderRequest, "fileEntryId");
083    
084                    String sourceVersion = ParamUtil.getString(
085                            renderRequest, "sourceVersion");
086                    String targetVersion = ParamUtil.getString(
087                            renderRequest, "targetVersion");
088    
089                    FileEntry fileEntry = DLAppServiceUtil.getFileEntry(fileEntryId);
090    
091                    String extension = fileEntry.getExtension();
092    
093                    FileVersion sourceFileVersion = fileEntry.getFileVersion(sourceVersion);
094    
095                    String sourceTitle = sourceFileVersion.getTitle();
096    
097                    FileVersion targetFileVersion = fileEntry.getFileVersion(targetVersion);
098    
099                    String targetTitle = targetFileVersion.getTitle();
100    
101                    InputStream sourceIs = fileEntry.getContentStream(sourceVersion);
102                    InputStream targetIs = fileEntry.getContentStream(targetVersion);
103    
104                    if (extension.equals("htm") || extension.equals("html") ||
105                            extension.equals("xml")) {
106    
107                            String escapedSource = HtmlUtil.escape(StringUtil.read(sourceIs));
108                            String escapedTarget = HtmlUtil.escape(StringUtil.read(targetIs));
109    
110                            sourceIs = new UnsyncByteArrayInputStream(
111                                    escapedSource.getBytes(StringPool.UTF8));
112                            targetIs = new UnsyncByteArrayInputStream(
113                                    escapedTarget.getBytes(StringPool.UTF8));
114                    }
115    
116                    if (DocumentConversionUtil.isEnabled() &&
117                            DocumentConversionUtil.isConvertBeforeCompare(extension)) {
118    
119                            String sourceTempFileId = DLUtil.getTempFileId(
120                                    fileEntryId, sourceVersion);
121                            String targetTempFileId = DLUtil.getTempFileId(
122                                    fileEntryId, targetVersion);
123    
124                            sourceIs = new FileInputStream(
125                                    DocumentConversionUtil.convert(
126                                            sourceTempFileId, sourceIs, extension, "txt"));
127                            targetIs = new FileInputStream(
128                                    DocumentConversionUtil.convert(
129                                            targetTempFileId, targetIs, extension, "txt"));
130                    }
131    
132                    List<DiffResult>[] diffResults = DiffUtil.diff(
133                            new InputStreamReader(sourceIs), new InputStreamReader(targetIs));
134    
135                    renderRequest.setAttribute(
136                            WebKeys.SOURCE_NAME,
137                            sourceTitle + StringPool.SPACE + sourceVersion);
138                    renderRequest.setAttribute(
139                            WebKeys.TARGET_NAME,
140                            targetTitle + StringPool.SPACE + targetVersion);
141                    renderRequest.setAttribute(WebKeys.DIFF_RESULTS, diffResults);
142            }
143    
144    }