publishing/org.argeo.publishing.ui/src/org/argeo/publishing/servlet/DbkServlet.java

   1 package org.argeo.publishing.servlet;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.ByteArrayOutputStream;
   5 import java.io.IOException;
   6 import java.io.InputStream;
   7 import java.net.URLDecoder;
   8 import java.nio.charset.StandardCharsets;
   9 import java.nio.file.Files;
  10 import java.nio.file.Paths;
  11 import java.util.Collections;
  12 import java.util.HashMap;
  13 import java.util.Map;
  14
  15 import javax.jcr.Node;
  16 import javax.jcr.Repository;
  17 import javax.jcr.RepositoryException;
  18 import javax.jcr.Session;
  19 import javax.jcr.nodetype.NodeType;
  20 import javax.servlet.ServletException;
  21 import javax.servlet.http.HttpServlet;
  22 import javax.servlet.http.HttpServletRequest;
  23 import javax.servlet.http.HttpServletResponse;
  24 import javax.xml.parsers.DocumentBuilder;
  25 import javax.xml.parsers.DocumentBuilderFactory;
  26 import javax.xml.transform.Result;
  27 import javax.xml.transform.Source;
  28 import javax.xml.transform.Templates;
  29 import javax.xml.transform.Transformer;
  30 import javax.xml.transform.TransformerConfigurationException;
  31 import javax.xml.transform.TransformerFactory;
  32 import javax.xml.transform.dom.DOMSource;
  33 import javax.xml.transform.stream.StreamResult;
  34 import javax.xml.transform.stream.StreamSource;
  35
  36 import org.apache.commons.io.IOUtils;
  37 import org.apache.xalan.processor.TransformerFactoryImpl;
  38 import org.argeo.cms.servlet.ServletAuthUtils;
  39 import org.argeo.cms.ui.CmsTheme;
  40 import org.argeo.docbook.DbkType;
  41 import org.argeo.docbook.DbkUtils;
  42 import org.argeo.jcr.Jcr;
  43 import org.argeo.jcr.JcrException;
  44 import org.argeo.jcr.JcrUtils;
  45 import org.w3c.dom.Document;
  46
  47 /**
  48  * A servlet transforming a dbk:* JCR node into HTML, using the DocBook XSL.
  49  */
  50 public class DbkServlet extends HttpServlet {
  51         private static final long serialVersionUID = 6906020513498289335L;
  52
  53         private Repository repository;
  54
  55         private DocumentBuilderFactory documentBuilderFactory;
  56         private TransformerFactory transformerFactory;
  57         private Templates docBoookTemplates;
  58
  59         private Map<String, CmsTheme> themes = Collections.synchronizedMap(new HashMap<>());
  60
  61         @Override
  62         protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  63
  64                 String pathInfo = req.getPathInfo();
  65                 if (pathInfo.startsWith("//"))
  66                         pathInfo = pathInfo.substring(1);
  67                 String path = URLDecoder.decode(pathInfo, StandardCharsets.UTF_8);
  68
  69                 if (path.toLowerCase().endsWith(".css")) {
  70                         path = path.substring(1);
  71                         int firstSlash = path.indexOf('/');
  72                         String themeId = path.substring(0, firstSlash);
  73                         String cssPath = path.substring(firstSlash);
  74                         CmsTheme cmsTheme = themes.get(themeId);
  75                         if (cmsTheme == null)
  76                                 throw new IllegalArgumentException("Theme " + themeId + " not found.");
  77                         resp.setContentType("text/css");
  78                         IOUtils.copy(cmsTheme.getResourceAsStream(cssPath), resp.getOutputStream());
  79                         return;
  80                 }
  81
  82                 if (path.toLowerCase().endsWith("/index.html")) {
  83                         path = path.substring(0, path.length() - "/index.html".length());
  84                 }
  85
  86                 Session session = null;
  87                 try {
  88                         session = ServletAuthUtils.doAs(() -> Jcr.login(repository, null), req);
  89                         Node node = session.getNode(path);
  90
  91                         if (node.hasNode(DbkType.article.get())) {
  92                                 Node dbkNode = node.getNode(DbkType.article.get());
  93                                 if (DbkUtils.isDbk(dbkNode)) {
  94                                         CmsTheme cmsTheme = null;
  95                                         String themeId = req.getParameter("themeId");
  96                                         if (themeId != null) {
  97                                                 cmsTheme = themes.get(themeId);
  98                                                 if (cmsTheme == null)
  99                                                         throw new IllegalArgumentException("Theme " + themeId + " not found.");
 100                                         }
 101
 102                                         // TODO customise DocBook so that it outputs UTF-8
 103                                         // see http://www.sagehill.net/docbookxsl/OutputEncoding.html
 104                                         resp.setContentType("text/html; charset=ISO-8859-1");
 105
 106                                         // TODO optimise with pipes, SAX, etc. ?
 107                                         byte[] arr;
 108                                         try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
 109                                                 session.exportDocumentView(dbkNode.getPath(), out, true, false);
 110                                                 arr = out.toByteArray();
 111 //                              System.out.println(new String(arr, StandardCharsets.UTF_8));
 112                                         } catch (RepositoryException e) {
 113                                                 throw new JcrException(e);
 114                                         }
 115
 116                                         try (InputStream in = new ByteArrayInputStream(arr);
 117 //                                      ByteArrayOutputStream out = new ByteArrayOutputStream();
 118                                         ) {
 119
 120                                                 Result xmlOutput = new StreamResult(resp.getOutputStream());
 121
 122                                                 DocumentBuilder docBuilder = documentBuilderFactory.newDocumentBuilder();
 123 //                              Document doc = docBuilder.parse(new File(
 124 //                                              System.getProperty("user.home") + "/dev/git/gpl/argeo-qa/doc/platform/argeo-platform.dbk.xml"));
 125                                                 Document doc = docBuilder.parse(in);
 126                                                 Source xmlInput = new DOMSource(doc);
 127
 128                                                 Transformer transformer = docBoookTemplates.newTransformer();
 129
 130                                                 // gather CSS
 131                                                 if (cmsTheme != null) {
 132                                                         StringBuilder sb = new StringBuilder();
 133                                                         for (String cssPath : cmsTheme.getWebCssPaths()) {
 134                                                                 sb.append(req.getContextPath()).append(req.getServletPath()).append('/');
 135                                                                 sb.append(themeId).append('/').append(cssPath).append(' ');
 136                                                         }
 137                                                         // FIXME make it more generic
 138                                                         sb.append("https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap")
 139                                                                         .append(' ');
 140                                                         sb.append(
 141                                                                         "https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,600;1,400&display=swap")
 142                                                                         .append(' ');
 143                                                         if (sb.length() > 0)
 144                                                                 transformer.setParameter("html.stylesheet", sb.toString());
 145                                                 }
 146                                                 transformer.transform(xmlInput, xmlOutput);
 147 //                              resp.getOutputStream().write(out.toByteArray());
 148                                         } catch (Exception e) {
 149                                                 throw new ServletException("Cannot transform " + path, e);
 150                                         }
 151                                 }
 152                         } else {
 153                                 if (node.isNodeType(NodeType.NT_FILE)) {// media download etc.
 154                                         String fileNameLowerCase = node.getName().toLowerCase();
 155                                         if (fileNameLowerCase.endsWith(".jpg") || fileNameLowerCase.endsWith(".jpeg")) {
 156                                                 resp.setContentType("image/jpeg");
 157                                         } else if (fileNameLowerCase.endsWith(".png")) {
 158                                                 resp.setContentType("image/png");
 159                                         } else if (fileNameLowerCase.endsWith(".gif")) {
 160                                                 resp.setContentType("image/gif");
 161                                         } else if (fileNameLowerCase.endsWith(".svg")) {
 162                                                 resp.setContentType("image/svg+xml");
 163                                         } else {
 164                                                 // TODO know more content types...
 165                                                 resp.setHeader("Content-Disposition", "attachment; filename=\"" + node.getName() + "\"");
 166                                         }
 167                                         IOUtils.copy(JcrUtils.getFileAsStream(node), resp.getOutputStream());
 168                                 } else {
 169                                         throw new IllegalArgumentException("Unsupported node " + node);
 170                                 }
 171                         }
 172                 } catch (RepositoryException e1) {
 173                         throw new JcrException(e1);
 174                 } finally {
 175                         Jcr.logout(session);
 176                 }
 177         }
 178
 179         @Override
 180         public void init() throws ServletException {
 181
 182                 // TODO improve configuration and provisioning of DocBook XSL
 183                 String xslBase = System.getProperty("argeo.docbook.xsl");
 184                 if (xslBase == null) {
 185                         String defaultXslBase = "/opt/docbook-xsl";
 186                         if (!Files.exists(Paths.get(defaultXslBase))) {
 187                                 throw new ServletException("System property argeo.docbook.xsl is not set and default location "
 188                                                 + defaultXslBase + " does not exist.");
 189                         } else {
 190                                 xslBase = defaultXslBase;
 191                         }
 192                 }
 193                 String xsl = xslBase + "/html/docbook.xsl";
 194
 195                 documentBuilderFactory = DocumentBuilderFactory.newInstance();
 196                 documentBuilderFactory.setXIncludeAware(true);
 197                 documentBuilderFactory.setNamespaceAware(true);
 198
 199                 // We must explicitly use the non-XSLTC transformer, as XSLTC is not working
 200                 // with DocBook stylesheets
 201                 transformerFactory = new TransformerFactoryImpl();
 202
 203                 Source xslSource = new StreamSource(xsl);
 204                 try {
 205                         docBoookTemplates = transformerFactory.newTemplates(xslSource);
 206                         if (docBoookTemplates == null)
 207                                 throw new ServletException("Could not instantiate XSL " + xsl);
 208                 } catch (TransformerConfigurationException e) {
 209                         throw new ServletException("Cannot instantiate XSL " + xsl, e);
 210                 }
 211         }
 212
 213         public void setRepository(Repository repository) {
 214                 this.repository = repository;
 215         }
 216
 217         public void addTheme(CmsTheme theme, Map<String, String> properties) {
 218                 themes.put(theme.getThemeId(), theme);
 219         }
 220
 221         public void removeTheme(CmsTheme theme, Map<String, String> properties) {
 222                 themes.remove(theme.getThemeId());
 223         }
 224
 225 }