org.argeo.app.servlet.publish/src/org/argeo/app/servlet/publish/DbkServlet.java

   1 package org.argeo.app.servlet.publish;
   2
   3 import java.io.BufferedOutputStream;
   4 import java.io.ByteArrayInputStream;
   5 import java.io.ByteArrayOutputStream;
   6 import java.io.File;
   7 import java.io.FileOutputStream;
   8 import java.io.IOException;
   9 import java.io.InputStream;
  10 import java.io.OutputStream;
  11 import java.net.URI;
  12 import java.net.URLDecoder;
  13 import java.nio.charset.StandardCharsets;
  14 import java.nio.file.Files;
  15 import java.nio.file.Paths;
  16 import java.util.Collections;
  17 import java.util.HashMap;
  18 import java.util.Map;
  19
  20 import javax.jcr.Node;
  21 import javax.jcr.Repository;
  22 import javax.jcr.RepositoryException;
  23 import javax.jcr.Session;
  24 import javax.jcr.nodetype.NodeType;
  25 import javax.servlet.ServletException;
  26 import javax.servlet.http.HttpServlet;
  27 import javax.servlet.http.HttpServletRequest;
  28 import javax.servlet.http.HttpServletResponse;
  29 import javax.xml.parsers.DocumentBuilder;
  30 import javax.xml.parsers.DocumentBuilderFactory;
  31 import javax.xml.transform.Result;
  32 import javax.xml.transform.Source;
  33 import javax.xml.transform.Templates;
  34 import javax.xml.transform.Transformer;
  35 import javax.xml.transform.TransformerConfigurationException;
  36 import javax.xml.transform.TransformerFactory;
  37 import javax.xml.transform.dom.DOMSource;
  38 import javax.xml.transform.sax.SAXResult;
  39 import javax.xml.transform.stream.StreamResult;
  40 import javax.xml.transform.stream.StreamSource;
  41
  42 import org.apache.commons.io.IOUtils;
  43 import org.apache.fop.apps.Fop;
  44 import org.apache.fop.apps.FopFactory;
  45 import org.apache.xalan.processor.TransformerFactoryImpl;
  46 import org.argeo.api.cms.ux.CmsTheme;
  47 import org.argeo.app.docbook.DbkType;
  48 import org.argeo.app.docbook.DbkUtils;
  49 import org.argeo.cms.auth.RemoteAuthUtils;
  50 import org.argeo.cms.servlet.ServletHttpRequest;
  51 import org.argeo.jcr.Jcr;
  52 import org.argeo.jcr.JcrException;
  53 import org.argeo.jcr.JcrUtils;
  54 import org.w3c.dom.Document;
  55
  56 /**
  57  * A servlet transforming a dbk:* JCR node into HTML, using the DocBook XSL.
  58  */
  59 public class DbkServlet extends HttpServlet {
  60         private static final long serialVersionUID = 6906020513498289335L;
  61
  62         private Repository repository;
  63
  64         private DocumentBuilderFactory documentBuilderFactory;
  65         private TransformerFactory transformerFactory;
  66         private Templates docBoookHtmlTemplates;
  67
  68         // FOP
  69         private Templates docBoookFoTemplates;
  70
  71         private Map<String, CmsTheme> themes = Collections.synchronizedMap(new HashMap<>());
  72
  73         @Override
  74         protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  75
  76                 String pathInfo = req.getPathInfo();
  77                 if (pathInfo.startsWith("//"))
  78                         pathInfo = pathInfo.substring(1);
  79                 String path = URLDecoder.decode(pathInfo, StandardCharsets.UTF_8);
  80
  81                 if (path.toLowerCase().endsWith(".css")) {
  82                         path = path.substring(1);
  83                         int firstSlash = path.indexOf('/');
  84                         String themeId = path.substring(0, firstSlash);
  85                         String cssPath = path.substring(firstSlash);
  86                         CmsTheme cmsTheme = themes.get(themeId);
  87                         if (cmsTheme == null)
  88                                 throw new IllegalArgumentException("Theme " + themeId + " not found.");
  89                         resp.setContentType("text/css");
  90                         IOUtils.copy(cmsTheme.getResourceAsStream(cssPath), resp.getOutputStream());
  91                         return;
  92                 }
  93
  94                 if (path.toLowerCase().endsWith("/index.html")) {
  95                         path = path.substring(0, path.length() - "/index.html".length());
  96                 }
  97
  98                 boolean pdf = false;
  99                 if (path.toLowerCase().endsWith(".pdf")) {
 100                         pdf = true;
 101                         if (path.toLowerCase().endsWith("/index.pdf")) {
 102                                 path = path.substring(0, path.length() - "/index.pdf".length());
 103                         }
 104                 }
 105
 106                 Session session = null;
 107                 try {
 108                         session = RemoteAuthUtils.doAs(() -> Jcr.login(repository, null), new ServletHttpRequest(req));
 109                         Node node = session.getNode(path);
 110
 111                         if (node.hasNode(DbkType.article.get())) {
 112                                 Node dbkNode = node.getNode(DbkType.article.get());
 113                                 if (DbkUtils.isDbk(dbkNode)) {
 114                                         CmsTheme cmsTheme = null;
 115                                         String themeId = req.getParameter("themeId");
 116                                         if (themeId != null) {
 117                                                 cmsTheme = themes.get(themeId);
 118                                                 if (cmsTheme == null)
 119                                                         throw new IllegalArgumentException("Theme " + themeId + " not found.");
 120                                         }
 121
 122                                         // TODO customise DocBook so that it outputs UTF-8
 123                                         // see http://www.sagehill.net/docbookxsl/OutputEncoding.html
 124                                         resp.setContentType("text/html; charset=ISO-8859-1");
 125
 126                                         // TODO optimise with pipes, SAX, etc. ?
 127                                         byte[] arr;
 128                                         try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
 129                                                 session.exportDocumentView(dbkNode.getPath(), out, true, false);
 130                                                 arr = out.toByteArray();
 131                                         } catch (RepositoryException e) {
 132                                                 throw new JcrException(e);
 133                                         }
 134
 135                                         try (InputStream in = new ByteArrayInputStream(arr);) {
 136
 137                                                 DocumentBuilder docBuilder = documentBuilderFactory.newDocumentBuilder();
 138                                                 Document doc = docBuilder.parse(in);
 139                                                 Source xmlInput = new DOMSource(doc);
 140
 141                                                 if (pdf) {
 142                                                         //String baseUri = req.getRequestURI();
 143                                                         FopFactory fopFactory = FopFactory.newInstance(URI.create(req.getRequestURL().toString()));
 144                                                         resp.setContentType("application/pdf");
 145
 146 //                                                      // DocBook to FO
 147 //                                                      byte[] foBytes;
 148 //                                                      try (ByteArrayOutputStream out = new ByteArrayOutputStream();) {
 149 //                                                              Result xmlOutput = new StreamResult(out);
 150 //                                                              Transformer docBookTransformer = docBoookFoTemplates.newTransformer();
 151 //                                                              docBookTransformer.transform(xmlInput, xmlOutput);
 152 //                                                              foBytes = out.toByteArray();
 153 //                                                      }
 154 //
 155 //                                                      // FO to PDF
 156 //                                                      try (InputStream foIn = new ByteArrayInputStream(foBytes)) {
 157 //                                                              Fop fop = fopFactory.newFop("application/pdf", resp.getOutputStream());
 158 //                                                              Transformer fopTransformer = transformerFactory.newTransformer(); // identity
 159 //                                                              Source src = new StreamSource(foIn);
 160 //                                                              Result fopResult = new SAXResult(fop.getDefaultHandler());
 161 //                                                              fopTransformer.transform(src, fopResult);
 162 //                                                      }
 163 //
 164
 165                                                         Fop fop = fopFactory.newFop("application/pdf", resp.getOutputStream());
 166                                                         Transformer docBookTransformer = docBoookFoTemplates.newTransformer();
 167                                                         Result fopResult = new SAXResult(fop.getDefaultHandler());
 168                                                         docBookTransformer.transform(xmlInput, fopResult);
 169
 170                                                 } else {
 171                                                         Result xmlOutput = new StreamResult(resp.getOutputStream());
 172                                                         resp.setContentType("text/html");
 173                                                         Transformer docBookTransformer = docBoookHtmlTemplates.newTransformer();
 174
 175                                                         // gather CSS
 176                                                         if (cmsTheme != null) {
 177                                                                 StringBuilder sb = new StringBuilder();
 178                                                                 for (String cssPath : cmsTheme.getWebCssPaths()) {
 179                                                                         sb.append(req.getContextPath()).append(req.getServletPath()).append('/');
 180                                                                         sb.append(themeId).append('/').append(cssPath).append(' ');
 181                                                                 }
 182                                                                 // FIXME make it more generic
 183                                                                 sb.append("https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap")
 184                                                                                 .append(' ');
 185                                                                 sb.append(
 186                                                                                 "https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,300;0,400;0,600;1,400&display=swap")
 187                                                                                 .append(' ');
 188                                                                 if (sb.length() > 0)
 189                                                                         docBookTransformer.setParameter("html.stylesheet", sb.toString());
 190                                                         }
 191                                                         docBookTransformer.transform(xmlInput, xmlOutput);
 192                                                 }
 193 //                              resp.getOutputStream().write(out.toByteArray());
 194                                         } catch (Exception e) {
 195                                                 throw new ServletException("Cannot transform " + path, e);
 196                                         }
 197                                 }
 198                         } else {
 199                                 if (node.isNodeType(NodeType.NT_FILE)) {// media download etc.
 200                                         String fileNameLowerCase = node.getName().toLowerCase();
 201                                         if (fileNameLowerCase.endsWith(".jpg") || fileNameLowerCase.endsWith(".jpeg")) {
 202                                                 resp.setContentType("image/jpeg");
 203                                         } else if (fileNameLowerCase.endsWith(".png")) {
 204                                                 resp.setContentType("image/png");
 205                                         } else if (fileNameLowerCase.endsWith(".gif")) {
 206                                                 resp.setContentType("image/gif");
 207                                         } else if (fileNameLowerCase.endsWith(".svg")) {
 208                                                 resp.setContentType("image/svg+xml");
 209                                         } else {
 210                                                 // TODO know more content types...
 211                                                 resp.setHeader("Content-Disposition", "attachment; filename=\"" + node.getName() + "\"");
 212                                         }
 213                                         IOUtils.copy(JcrUtils.getFileAsStream(node), resp.getOutputStream());
 214                                 } else {
 215                                         throw new IllegalArgumentException("Unsupported node " + node);
 216                                 }
 217                         }
 218                 } catch (RepositoryException e1) {
 219                         throw new JcrException(e1);
 220                 } finally {
 221                         Jcr.logout(session);
 222                 }
 223         }
 224
 225         @Override
 226         public void init() throws ServletException {
 227
 228                 // TODO improve configuration and provisioning of DocBook XSL
 229                 String xslBase = System.getProperty("argeo.docbook.xsl");
 230                 if (xslBase == null) {
 231                         // We need namespace aware XSL!
 232                         // Fedora (sudo dnf install docbook5-style-xsl)
 233                         String defaultXslBase = "/usr/share/xml/docbook/stylesheet/docbook-xsl-ns/";
 234                         if (!Files.exists(Paths.get(defaultXslBase))) {
 235                                 defaultXslBase = "/opt/docbook-xsl";
 236                                 if (!Files.exists(Paths.get(defaultXslBase))) {
 237                                         throw new ServletException("System property argeo.docbook.xsl is not set and default location "
 238                                                         + defaultXslBase + " does not exist.");
 239                                 }
 240                         }
 241                         xslBase = defaultXslBase;
 242
 243                 }
 244
 245                 documentBuilderFactory = DocumentBuilderFactory.newInstance();
 246                 documentBuilderFactory.setXIncludeAware(true);
 247                 documentBuilderFactory.setNamespaceAware(true);
 248
 249                 // We must explicitly use the non-XSLTC transformer, as XSLTC is not working
 250                 // with DocBook stylesheets
 251                 transformerFactory = new TransformerFactoryImpl();
 252
 253                 String htmlXsl = xslBase + "/html/docbook.xsl";
 254                 docBoookHtmlTemplates = createDocBookTemplates(htmlXsl);
 255                 String foXsl = xslBase + "/fo/docbook.xsl";
 256                 docBoookFoTemplates = createDocBookTemplates(foXsl);
 257         }
 258
 259         protected Templates createDocBookTemplates(String xsl) {
 260                 try {
 261                         Source xslSource = new StreamSource(xsl);
 262                         Templates templates = transformerFactory.newTemplates(xslSource);
 263                         if (templates == null)
 264                                 throw new IllegalStateException("Could not instantiate XSL " + xsl);
 265                         return templates;
 266                 } catch (TransformerConfigurationException e) {
 267                         throw new IllegalStateException("Cannot instantiate XSL " + xsl, e);
 268                 }
 269
 270         }
 271
 272         public void setRepository(Repository repository) {
 273                 this.repository = repository;
 274         }
 275
 276         public void addTheme(CmsTheme theme, Map<String, String> properties) {
 277                 themes.put(theme.getThemeId(), theme);
 278         }
 279
 280         public void removeTheme(CmsTheme theme, Map<String, String> properties) {
 281                 themes.remove(theme.getThemeId());
 282         }
 283
 284         public static void main(String[] args) throws Exception {
 285                 // Step 1: Construct a FopFactory by specifying a reference to the configuration
 286                 // file
 287                 // (reuse if you plan to render multiple documents!)
 288                 FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI());
 289
 290                 // Step 2: Set up output stream.
 291                 // Note: Using BufferedOutputStream for performance reasons (helpful with
 292                 // FileOutputStreams).
 293                 OutputStream out = new BufferedOutputStream(new FileOutputStream(new File(
 294                                 System.getProperty("user.home") + "/dev/git/unstable/argeo-qa/doc/platform/argeo-platform-test.pdf")));
 295
 296                 try {
 297                         // Step 3: Construct fop with desired output format
 298                         Fop fop = fopFactory.newFop("application/pdf", out);
 299
 300                         // Step 4: Setup JAXP using identity transformer
 301                         TransformerFactory fopTransformerFactory = TransformerFactory.newInstance();
 302                         Transformer fopTransformer = fopTransformerFactory.newTransformer(); // identity transformer
 303
 304                         // Step 5: Setup input and output for XSLT transformation
 305                         // Setup input stream
 306                         Source src = new StreamSource(new File(
 307                                         System.getProperty("user.home") + "/dev/git/unstable/argeo-qa/doc/platform/argeo-platform.fo"));
 308
 309                         // Resulting SAX events (the generated FO) must be piped through to FOP
 310                         Result res = new SAXResult(fop.getDefaultHandler());
 311
 312                         // Step 6: Start XSLT transformation and FOP processing
 313                         fopTransformer.transform(src, res);
 314
 315                 } finally {
 316                         // Clean-up
 317                         out.close();
 318                 }
 319         }
 320 }