bundles/org.simantics.debug.browser/src/org/simantics/debug/browser/servlet/ResourceBrowserServlet.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2016 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     THTH ry - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.debug.browser.servlet;\r
  13 \r
  14 import java.io.IOException;\r
  15 import java.io.PrintWriter;\r
  16 import java.net.URI;\r
  17 import java.net.URISyntaxException;\r
  18 \r
  19 import javax.servlet.ServletException;\r
  20 import javax.servlet.http.HttpServlet;\r
  21 import javax.servlet.http.HttpServletRequest;\r
  22 import javax.servlet.http.HttpServletResponse;\r
  23 \r
  24 import org.simantics.Simantics;\r
  25 import org.simantics.db.ReadGraph;\r
  26 import org.simantics.db.Resource;\r
  27 import org.simantics.db.Session;\r
  28 import org.simantics.db.common.request.Queries;\r
  29 import org.simantics.db.common.request.ReadRequest;\r
  30 import org.simantics.db.common.request.UnaryRead;\r
  31 import org.simantics.db.exception.DatabaseException;\r
  32 import org.simantics.db.exception.ResourceNotFoundException;\r
  33 import org.simantics.db.service.ClusteringSupport;\r
  34 import org.simantics.db.service.SerialisationSupport;\r
  35 import org.simantics.debug.browser.content.ResourceBrowserContent;\r
  36 \r
  37 public class ResourceBrowserServlet extends HttpServlet {\r
  38 \r
  39         private static final long serialVersionUID = -8253560202827865253L;\r
  40 \r
  41         @Override\r
  42         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r
  43                 response.setContentType("text/html; charset=utf-8");\r
  44                 response.setStatus(HttpServletResponse.SC_OK);\r
  45 \r
  46                 final PrintWriter writer = response.getWriter();\r
  47                 try {\r
  48                         Session session = Simantics.peekSession();\r
  49                         if (session == null) {\r
  50                                 writer.write("<html><body>No database session.</body></html>");\r
  51                                 return;\r
  52                         }\r
  53 \r
  54                         String requestedResource = request.getPathInfo();\r
  55                         if (requestedResource == null || requestedResource.equals("/")) {\r
  56                                 long rootId = session.getRootLibrary().getResourceId();\r
  57                                 //writer.write("<html><body>No resource requested. Try <a href=\"" + rootId + "\">database root</a>.</body></html>");\r
  58                                 response.sendRedirect("" + rootId);\r
  59                                 return;\r
  60                         }\r
  61 \r
  62                         // Skip '/' suffix\r
  63                         requestedResource = requestedResource.substring(1);\r
  64                         final long resource = parseLong(requestedResource);\r
  65 \r
  66                         if (resource != 0L) {\r
  67                                 session.syncRequest(new ReadRequest() {\r
  68                                         @Override\r
  69                                         public void run(ReadGraph graph) throws DatabaseException {\r
  70                                                 ResourceBrowserContent content = graph.syncRequest(new GetContent(resource));\r
  71                                                 content.toHtml(graph, writer);\r
  72                                         }\r
  73                                 });\r
  74                         } else {\r
  75                                 writer.write("<html><body>Resource not found: <em>");\r
  76                                 writer.write(requestedResource);\r
  77                                 writer.write("</em></body></html>");\r
  78                         }\r
  79                 } catch (Throwable e) {\r
  80                         writer.write("<html><body>Problem occurred while reading <em>");\r
  81                         writer.write(request.getPathInfo());\r
  82                         writer.write("</em>:<br/><pre>");\r
  83                         e.printStackTrace(writer);\r
  84                         writer.write("</pre></body></html>");\r
  85                 }\r
  86         }\r
  87         \r
  88         @Override\r
  89         protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r
  90             \r
  91             Resource foundResource = null;\r
  92             Session session = Simantics.getSession();\r
  93             \r
  94             String input = request.getParameter("resource-input");\r
  95             if (input != null && !input.isEmpty()) {\r
  96             // There's no harm in trimming out spaces from both ends of the input.\r
  97             input = input.trim();\r
  98             SerialisationSupport support = session.getService(SerialisationSupport.class);\r
  99             if (input.startsWith("$")) {\r
 100                 try {\r
 101                     foundResource = support.getResource(Long.parseLong(input.substring(1)));\r
 102                 } catch (NumberFormatException e) {\r
 103                     // Let's silently fail here for now and navigate to project resource in the end\r
 104                     //e.printStackTrace();\r
 105                 } catch (Exception e) {\r
 106                     // Let's silently fail here for now and navigate to project resource in the end\r
 107                     //e.printStackTrace();\r
 108                 }\r
 109             }\r
 110     \r
 111             if (foundResource == null) {\r
 112                 String[] parts = input.split("-");\r
 113                 if (parts.length == 1) {\r
 114                     try {\r
 115                         int resourceKey = Integer.parseInt(parts[0].trim());\r
 116                         foundResource = support.getResource(resourceKey);\r
 117                         // Some validation, not enough though\r
 118                         ClusteringSupport cs = session.getService(ClusteringSupport.class);\r
 119                         long cluster = cs.getCluster(foundResource);\r
 120                         if(cluster > 0) {\r
 121         //                    changeLocation(r);\r
 122                         }\r
 123                     } catch (NumberFormatException e1) {\r
 124                         // Ignore, may happen for crap input\r
 125                         // e1.printStackTrace();\r
 126                     } catch (Exception e1) {\r
 127                         // Let's silently fail here for now and navigate to project resource in the end\r
 128                         //e1.printStackTrace();\r
 129                     }\r
 130                 } else if (parts.length == 2) {\r
 131                     try {\r
 132                         int resourceIndex = Integer.parseInt(parts[1]);\r
 133                         long clusterId = Long.parseLong(parts[0]);\r
 134                         ClusteringSupport cs = session.getService(ClusteringSupport.class);\r
 135                         foundResource = cs.getResourceByIndexAndCluster(resourceIndex, clusterId);\r
 136                     } catch (NumberFormatException e1) {\r
 137                         // Let's silently fail here for now and navigate to project resource in the end\r
 138                         //e1.printStackTrace();\r
 139                     } catch (Exception e1) {\r
 140                         // Let's silently fail here for now and navigate to project resource in the end\r
 141                         //e1.printStackTrace();\r
 142                     }\r
 143                 }\r
 144             }\r
 145             if (foundResource == null) {\r
 146                 // Try to see if the input data is an URI reference\r
 147                 try {\r
 148                     // First check that the input really is a proper URI.\r
 149                     String uri = input;\r
 150                     if (!input.equals("http:/") && input.endsWith("/"))\r
 151                         uri = input.substring(0, input.length() - 1);\r
 152                     new URI(uri);\r
 153                     foundResource = session.syncRequest( Queries.resource( uri ) );\r
 154                 } catch (URISyntaxException e) {\r
 155                     // Ignore, this is not a proper URI at all.\r
 156                 } catch (ResourceNotFoundException e1) {\r
 157                     // Ok, this was an URI, but no resource was found.\r
 158                     // Let's silently fail here for now and navigate to project resource in the end\r
 159                     //e1.printStackTrace();\r
 160                 } catch (DatabaseException e1) {\r
 161                     // Let's silently fail here for now and navigate to project resource in the end\r
 162                     //e1.printStackTrace();\r
 163                 }\r
 164             }\r
 165             }\r
 166         \r
 167         if (foundResource != null) {\r
 168             response.sendRedirect("" + foundResource.getResourceId());\r
 169         } else {\r
 170             long rootId = session.getRootLibrary().getResourceId();\r
 171             response.sendRedirect("" + rootId);\r
 172         }\r
 173         return;\r
 174         }\r
 175 \r
 176         private static long parseLong(String s) {\r
 177                 try {\r
 178                         return Long.parseLong(s);\r
 179                 } catch (NumberFormatException e) {\r
 180                         return 0;\r
 181                 }\r
 182         }\r
 183 \r
 184         static class GetContent extends UnaryRead<Long, ResourceBrowserContent> {\r
 185                 public GetContent(long parameter) {\r
 186                         super(parameter);\r
 187                 }\r
 188 \r
 189                 @Override\r
 190                 public ResourceBrowserContent perform(ReadGraph graph) throws DatabaseException {\r
 191                         Resource r = graph.getService(SerialisationSupport.class).getResource(parameter);\r
 192                         return ResourceBrowserContent.createContentFor(graph, r);\r
 193                 }\r
 194         }\r
 195 \r
 196 }\r