1 | package org.greenstone.gsdl3.core;
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2 |
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3 | import org.greenstone.gsdl3.util.*;
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4 | import org.greenstone.gsdl3.action.*;
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5 | // XML classes
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6 | import org.w3c.dom.Node;
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7 | import org.w3c.dom.NodeList;
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8 | import org.w3c.dom.Document;
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9 | import org.w3c.dom.Element;
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10 | import org.xml.sax.InputSource;
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11 |
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12 | // other java classes
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13 | import java.io.File;
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14 | import java.io.StringWriter;
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15 | import java.io.FileReader;
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16 | import java.io.FileNotFoundException;
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17 | import java.util.HashMap;
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18 | import java.util.Enumeration;
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19 |
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20 | import javax.xml.parsers.*;
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21 | import javax.xml.transform.*;
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22 | import javax.xml.transform.dom.*;
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23 | import javax.xml.transform.stream.*;
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24 | import org.apache.log4j.*;
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25 | import org.apache.xerces.dom.*;
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26 | import org.apache.xerces.parsers.DOMParser;
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27 |
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28 | /** A receptionist that uses xslt to transform the page_data before returning it. . Receives requests consisting
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29 | * of an xml representation of cgi args, and returns the page of data - in
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30 | * html by default. The requests are processed by the appropriate action class
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31 | *
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32 | * @see Action
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33 | */
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34 | public class TransformingReceptionist extends Receptionist{
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35 |
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36 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.core.TransformingReceptionist.class.getName());
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37 |
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38 | /** The preprocess.xsl file is in a fixed location */
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39 | static final String preprocess_xsl_filename = GlobalProperties.getGSDL3Home() + File.separatorChar
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40 | + "ui" + File.separatorChar + "xslt" + File.separatorChar + "preProcess.xsl";
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41 |
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42 | /** the list of xslt to use for actions */
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43 | protected HashMap xslt_map = null;
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44 |
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45 | /** a transformer class to transform xml using xslt */
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46 | protected XMLTransformer transformer=null;
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47 |
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48 | protected TransformerFactory transformerFactory=null;
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49 | protected DOMParser parser = null;
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50 | public TransformingReceptionist() {
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51 | super();
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52 | this.xslt_map = new HashMap();
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53 | this.transformer = new XMLTransformer();
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54 | try {
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55 | transformerFactory = org.apache.xalan.processor.TransformerFactoryImpl.newInstance();
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56 | this.converter = new XMLConverter();
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57 | //transformerFactory.setURIResolver(new MyUriResolver()) ;
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58 |
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59 | parser = new DOMParser();
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60 | parser.setFeature("http://xml.org/sax/features/validation", false);
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61 | // don't try and load external DTD - no need if we are not validating, and may cause connection errors if a proxy is not set up.
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62 | parser.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
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63 | // a performance test showed that having this on lead to increased
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64 | // memory use for small-medium docs, and not much gain for large
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65 | // docs.
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66 | // http://www.sosnoski.com/opensrc/xmlbench/conclusions.html
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67 | parser.setFeature("http://apache.org/xml/features/dom/defer-node-expansion", false);
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68 | parser.setFeature("http://apache.org/xml/features/continue-after-fatal-error", true);
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69 | // setting a handler for when fatal errors, errors or warnings happen during xml parsing
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70 | // call XMLConverter's getParseErrorMessage() to get the errorstring that can be rendered as web page
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71 | this.parser.setErrorHandler(new XMLConverter.ParseErrorHandler());
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72 | }
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73 | catch (Exception e) {
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74 | e.printStackTrace();
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75 | }
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76 |
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77 | }
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78 |
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79 | /** configures the receptionist - overwrite this to set up the xslt map*/
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80 | public boolean configure() {
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81 |
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82 | if (this.config_params==null) {
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83 | logger.error(" config variables must be set before calling configure");
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84 | return false;
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85 | }
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86 | if (this.mr==null) {
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87 | logger.error(" message router must be set before calling configure");
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88 | return false;
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89 | }
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90 |
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91 | // find the config file containing a list of actions
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92 | File interface_config_file = new File(GSFile.interfaceConfigFile(GSFile.interfaceHome(GlobalProperties.getGSDL3Home(), (String)this.config_params.get(GSConstants.INTERFACE_NAME))));
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93 | if (!interface_config_file.exists()) {
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94 | logger.error(" interface config file: "+interface_config_file.getPath()+" not found!");
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95 | return false;
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96 | }
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97 | Document config_doc = this.converter.getDOM(interface_config_file, "utf-8");
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98 | if (config_doc == null) {
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99 | logger.error(" could not parse interface config file: "+interface_config_file.getPath());
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100 | return false;
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101 | }
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102 | Element config_elem = config_doc.getDocumentElement();
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103 | String base_interface = config_elem.getAttribute("baseInterface");
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104 | setUpBaseInterface(base_interface);
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105 | setUpInterfaceOptions(config_elem);
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106 |
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107 | Element action_list = (Element)GSXML.getChildByTagName(config_elem, GSXML.ACTION_ELEM+GSXML.LIST_MODIFIER);
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108 | NodeList actions = action_list.getElementsByTagName(GSXML.ACTION_ELEM);
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109 |
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110 | for (int i=0; i<actions.getLength(); i++) {
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111 | Element action = (Element) actions.item(i);
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112 | String class_name = action.getAttribute("class");
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113 | String action_name = action.getAttribute("name");
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114 | Action ac = null;
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115 | try {
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116 | ac = (Action)Class.forName("org.greenstone.gsdl3.action."+class_name).newInstance();
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117 | } catch (Exception e) {
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118 | logger.error(" couldn't load in action "+class_name);
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119 | e.printStackTrace();
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120 | continue;
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121 | }
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122 | ac.setConfigParams(this.config_params);
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123 | ac.setMessageRouter(this.mr);
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124 | ac.configure();
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125 | ac.getActionParameters(this.params);
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126 | this.action_map.put(action_name, ac);
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127 |
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128 | // now do the xslt map
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129 | String xslt = action.getAttribute("xslt");
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130 | if (!xslt.equals("")) {
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131 | this.xslt_map.put(action_name, xslt);
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132 | }
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133 | NodeList subactions = action.getElementsByTagName(GSXML.SUBACTION_ELEM);
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134 | for (int j=0; j<subactions.getLength(); j++) {
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135 | Element subaction = (Element)subactions.item(j);
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136 | String subname = subaction.getAttribute(GSXML.NAME_ATT);
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137 | String subxslt = subaction.getAttribute("xslt");
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138 |
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139 | String map_key = action_name+":"+subname;
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140 | logger.debug("adding in to xslt map, "+map_key+"->"+subxslt);
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141 | this.xslt_map.put(map_key, subxslt);
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142 | }
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143 | }
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144 | Element lang_list = (Element)GSXML.getChildByTagName(config_elem, "languageList");
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145 | if (lang_list == null) {
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146 | logger.error(" didn't find a language list in the config file!!");
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147 | } else {
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148 | this.language_list = (Element) this.doc.importNode(lang_list, true);
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149 | }
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150 |
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151 | return true;
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152 | }
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153 |
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154 |
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155 | protected Node postProcessPage(Element page) {
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156 | // might need to add some data to the page
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157 | addExtraInfo(page);
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158 | // transform the page using xslt
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159 | Node transformed_page = transformPage(page);
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160 |
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161 | return transformed_page;
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162 | }
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163 |
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164 | /** overwrite this to add any extra info that might be needed in the page before transformation */
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165 | protected void addExtraInfo(Element page) {}
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166 |
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167 | /** transform the page using xslt
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168 | * we need to get any format element out of the page and add it to the xslt
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169 | * before transforming */
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170 | protected Node transformPage(Element page) {
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171 |
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172 | logger.debug("page before transfomring:");
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173 | logger.debug(this.converter.getPrettyString(page));
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174 |
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175 | Element request = (Element)GSXML.getChildByTagName(page, GSXML.PAGE_REQUEST_ELEM);
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176 | String action = request.getAttribute(GSXML.ACTION_ATT);
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177 | String subaction = request.getAttribute(GSXML.SUBACTION_ATT);
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178 |
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179 | String output = request.getAttribute(GSXML.OUTPUT_ATT);
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180 | // we should choose how to transform the data based on output, eg diff
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181 | // choice for html, and wml??
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182 | // for now, if output=xml, we don't transform the page, we just return
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183 | // the page xml
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184 | if (output.equals("xml")) {
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185 | return page;
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186 | }
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187 |
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188 |
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189 | Element cgi_param_list = (Element)GSXML.getChildByTagName(request, GSXML.PARAM_ELEM+GSXML.LIST_MODIFIER);
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190 | String collection = "";
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191 | if (cgi_param_list != null) {
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192 | HashMap params = GSXML.extractParams(cgi_param_list, false);
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193 | collection = (String)params.get(GSParams.COLLECTION);
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194 | if (collection == null) collection = "";
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195 | }
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196 |
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197 | String xslt_file = getXSLTFileName(action, subaction, collection);
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198 | if (xslt_file==null) {
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199 | // returning file not found error page to indicate which file is missing
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200 | return fileNotFoundErrorPage(xslt_file);
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201 | }
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202 |
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203 | Document style_doc = this.converter.getDOM(new File(xslt_file), "UTF-8");
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204 | String errorPage = this.converter.getParseErrorMessage();
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205 | if(errorPage != null) {
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206 | return XMLTransformer.constructErrorXHTMLPage(
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207 | "Cannot parse the xslt file: " + xslt_file + "\n" + errorPage);
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208 | }
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209 | if (style_doc == null) {
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210 | logger.error(" cant parse the xslt file needed, so returning the original page!");
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211 | return page;
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212 | }
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213 |
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214 | // put the page into a document - this is necessary for xslt to get
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215 | // the paths right if you have paths relative to the document root
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216 | // eg /page.
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217 | Document doc = this.converter.newDOM();
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218 | doc.appendChild(doc.importNode(page, true));
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219 | Element page_response = (Element)GSXML.getChildByTagName(page, GSXML.PAGE_RESPONSE_ELEM);
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220 | Element format_elem = (Element)GSXML.getChildByTagName(page_response, GSXML.FORMAT_ELEM);
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221 | if (output.equals("formatelem")) {
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222 | return format_elem;
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223 | }
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224 | if (format_elem != null) {
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225 | //page_response.removeChild(format_elem);
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226 | logger.debug("format elem="+this.converter.getPrettyString(format_elem));
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227 | // need to transform the format info
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228 | String configStylesheet_file = GSFile.stylesheetFile(GlobalProperties.getGSDL3Home(), (String)this.config_params.get(GSConstants.SITE_NAME), collection, (String)this.config_params.get(GSConstants.INTERFACE_NAME), base_interfaces, "config_format.xsl");
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229 | Document configStylesheet_doc = this.converter.getDOM(new File(configStylesheet_file));
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230 | if (configStylesheet_doc != null) {
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231 | Document format_doc = this.converter.newDOM();
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232 | format_doc.appendChild(format_doc.importNode(format_elem, true));
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233 | Node result = this.transformer.transform(configStylesheet_doc, format_doc);
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234 |
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235 | // Since we started creating documents with DocTypes, we can end up with
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236 | // Document objects here. But we will be working with an Element instead,
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237 | // so we grab the DocumentElement() of the Document object in such a case.
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238 | Element new_format;
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239 | if(result.getNodeType() == Node.DOCUMENT_NODE) {
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240 | new_format = ((Document)result).getDocumentElement();
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241 | } else {
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242 | new_format = (Element)result;
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243 | }
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244 | logger.debug("new format elem="+this.converter.getPrettyString(new_format));
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245 | if (output.equals("newformat")) {
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246 | return new_format;
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247 | }
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248 |
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249 | // add extracted GSF statements in to the main stylesheet
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250 | GSXSLT.mergeStylesheets(style_doc, new_format);
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251 | //System.out.println("added extracted GSF statements into the main stylesheet") ;
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252 |
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253 | // add extracted GSF statements in to the debug test stylesheet
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254 | //GSXSLT.mergeStylesheets(oldStyle_doc, new_format);
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255 | } else {
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256 | logger.error(" couldn't parse the config_format stylesheet, adding the format info as is");
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257 | GSXSLT.mergeStylesheets(style_doc, format_elem);
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258 | // GSXSLT.mergeStylesheets(oldStyle_doc, format_elem);
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259 | }
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260 | logger.debug("the converted stylesheet is:");
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261 | logger.debug(this.converter.getPrettyString(style_doc.getDocumentElement()));
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262 | }
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263 | //for debug purposes only
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264 | Document oldStyle_doc = style_doc;
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265 |
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266 |
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267 | Document preprocessingXsl ;
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268 | try {
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269 | preprocessingXsl = getPreprocessDoc();
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270 | String errMsg = ((XMLConverter.ParseErrorHandler)parser.getErrorHandler()).getErrorMessage();
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271 | if(errMsg != null) {
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272 | return XMLTransformer.constructErrorXHTMLPage("error loading preprocess xslt file: "
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273 | + preprocess_xsl_filename + "\n" + errMsg);
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274 | }
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275 | } catch (java.io.FileNotFoundException e) {
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276 | return fileNotFoundErrorPage(e.getMessage());
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277 | } catch (Exception e) {
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278 | e.printStackTrace() ;
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279 | System.out.println("error loading preprocess xslt") ;
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280 | return XMLTransformer.constructErrorXHTMLPage("error loading preprocess xslt\n" + e.getMessage());
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281 | }
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282 |
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283 | Document libraryXsl = null;
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284 | try {
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285 | libraryXsl = getLibraryDoc() ;
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286 | String errMsg = ((XMLConverter.ParseErrorHandler)parser.getErrorHandler()).getErrorMessage();
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287 | if(errMsg != null) {
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288 | return XMLTransformer.constructErrorXHTMLPage("Error loading xslt file: "
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289 | + this.getLibraryXSLFilename() + "\n" + errMsg);
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290 | }
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291 | } catch (java.io.FileNotFoundException e) {
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292 | return fileNotFoundErrorPage(e.getMessage());
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293 | } catch (Exception e) {
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294 | e.printStackTrace() ;
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295 | System.out.println("error loading library xslt") ;
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296 | return XMLTransformer.constructErrorXHTMLPage("error loading library xslt\n" + e.getMessage()) ;
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297 | }
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298 |
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299 | // Combine the skin file and library variables/templates into one document.
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300 | // Please note: We dont just use xsl:import because the preprocessing stage
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301 | // needs to know what's available in the library.
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302 |
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303 | Document skinAndLibraryXsl = null ;
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304 | Document skinAndLibraryDoc = converter.newDOM();
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305 | try {
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306 |
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307 | skinAndLibraryXsl = converter.newDOM();
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308 | Element root = skinAndLibraryXsl.createElement("skinAndLibraryXsl") ;
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309 | skinAndLibraryXsl.appendChild(root) ;
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310 |
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311 | Element s = skinAndLibraryXsl.createElement("skinXsl") ;
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312 | s.appendChild(skinAndLibraryXsl.importNode(style_doc.getDocumentElement(), true)) ;
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313 | root.appendChild(s) ;
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314 |
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315 | Element l = skinAndLibraryXsl.createElement("libraryXsl") ;
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316 | Element libraryXsl_el = libraryXsl.getDocumentElement();
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317 | l.appendChild(skinAndLibraryXsl.importNode(libraryXsl_el, true)) ;
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318 | root.appendChild(l) ;
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319 | //System.out.println("Skin and Library XSL are now together") ;
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320 |
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321 |
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322 | //System.out.println("Pre-processing the skin file...") ;
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323 |
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324 | //pre-process the skin style sheet
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325 | //In other words, apply the preProcess.xsl to 'skinAndLibraryXsl' in order to
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326 | //expand all GS-Lib statements into complete XSL statements and also to create
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327 | //a valid xsl style sheet document.
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328 |
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329 | Transformer preProcessor = transformerFactory.newTransformer(new DOMSource(preprocessingXsl));
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330 | preProcessor.setErrorListener(new XMLTransformer.TransformErrorListener());
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331 | DOMResult result = new DOMResult();
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332 | result.setNode(skinAndLibraryDoc);
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333 | preProcessor.transform(new DOMSource(skinAndLibraryXsl), result);
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334 | //System.out.println("GS-Lib statements are now expanded") ;
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335 |
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336 | }
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337 | catch (TransformerException e) {
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338 | e.printStackTrace() ;
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339 | System.out.println("TransformerException while preprocessing the skin xslt") ;
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340 | return XMLTransformer.constructErrorXHTMLPage(e.getMessage()) ;
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341 | }
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342 | catch (Exception e) {
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343 | e.printStackTrace() ;
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344 | System.out.println("Error while preprocessing the skin xslt") ;
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345 | return XMLTransformer.constructErrorXHTMLPage(e.getMessage()) ;
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346 | }
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347 |
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348 | // there is a thing called a URIResolver which you can set for a
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349 | // transformer or transformer factory. may be able to use this
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350 | // instead of this absoluteIncludepaths hack
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351 |
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352 | GSXSLT.absoluteIncludePaths(skinAndLibraryDoc, GlobalProperties.getGSDL3Home(),
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353 | (String)this.config_params.get(GSConstants.SITE_NAME),
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354 | collection, (String)this.config_params.get(GSConstants.INTERFACE_NAME),
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355 | base_interfaces);
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356 |
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357 |
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358 | //Same but for the debug version when we want the do the transformation like we use to do
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359 | //without any gslib elements.
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360 | GSXSLT.absoluteIncludePaths(oldStyle_doc, GlobalProperties.getGSDL3Home(),
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361 | (String)this.config_params.get(GSConstants.SITE_NAME),
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362 | collection, (String)this.config_params.get(GSConstants.INTERFACE_NAME),
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363 | base_interfaces);
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364 |
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365 | //Send different stages of the skin xslt to the browser for debug purposes only
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366 | //using &o=skindoc or &o=skinandlib etc...
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367 | if (output.equals("skindoc")) {
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368 | return converter.getDOM(getStringFromDocument(style_doc));
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369 | }
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370 | if (output.equals("skinandlib")) {
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371 | return converter.getDOM(getStringFromDocument(skinAndLibraryXsl));
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372 | }
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373 | if (output.equals("skinandlibdoc")) {
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374 | return converter.getDOM(getStringFromDocument(skinAndLibraryDoc));
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375 | }
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376 | if (output.equals("oldskindoc")) {
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377 | return converter.getDOM(getStringFromDocument(oldStyle_doc));
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378 | }
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379 |
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380 | // DocType defaults in case the skin doesn't have an "xsl:output" element
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381 | String qualifiedName = "html";
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382 | String publicID = "-//W3C//DTD HTML 4.01 Transitional//EN";
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383 | String systemID = "http://www.w3.org/TR/html4/loose.dtd";
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384 |
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385 | // Try to get the system and public ID from the current skin xsl document
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386 | // otherwise keep the default values.
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387 | Element root = skinAndLibraryDoc.getDocumentElement();
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388 | NodeList nodes = root.getElementsByTagName("xsl:output");
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389 | // If there is at least one "xsl:output" command in the final xsl then...
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390 | if(nodes.getLength() != 0) {
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391 | // There should be only one element called xsl:output,
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392 | // but if this is not the case get the last one
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393 | Element xsl_output = (Element)nodes.item(nodes.getLength()-1);
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394 | if (xsl_output != null) {
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395 | // Qualified name will always be html even for xhtml pages
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396 | //String attrValue = xsl_output.getAttribute("method");
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397 | //qualifiedName = attrValue.equals("") ? qualifiedName : attrValue;
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398 |
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399 | String attrValue = xsl_output.getAttribute("doctype-system");
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400 | systemID = attrValue.equals("") ? systemID : attrValue;
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401 |
|
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402 | attrValue = xsl_output.getAttribute("doctype-public");
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403 | publicID = attrValue.equals("") ? publicID : attrValue;
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404 | }
|
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405 | }
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406 |
|
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407 | // We need to create an empty document with a predefined DocType,
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408 | // that will then be used for the transformation by the DOMResult
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409 | Document docWithDoctype = converter.newDOM(qualifiedName, publicID, systemID);
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410 |
|
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411 | //System.out.println(converter.getPrettyString(docWithDoctype));
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412 | //System.out.println("Doctype vals: " + qualifiedName + " " + publicID + " " + systemID) ;
|
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413 |
|
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414 | //System.out.println("Generate final HTML from current skin") ;
|
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415 | //Transformation of the XML message from the receptionist to HTML with doctype
|
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416 | return this.transformer.transform(skinAndLibraryDoc, doc, config_params, docWithDoctype);
|
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417 |
|
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418 |
|
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419 | // The line below will do the transformation like we use to do before having Skin++ implemented,
|
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420 | // it will not contain any GS-Lib statements expanded, and the result will not contain any doctype.
|
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421 |
|
---|
422 | //return (Element)this.transformer.transform(style_doc, doc, config_params);
|
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423 |
|
---|
424 | }
|
---|
425 |
|
---|
426 |
|
---|
427 | // method to convert Document to a proper XML string for debug purposes only
|
---|
428 | protected String getStringFromDocument(Document doc)
|
---|
429 | {
|
---|
430 | String content = "";
|
---|
431 | try
|
---|
432 | {
|
---|
433 | DOMSource domSource = new DOMSource(doc);
|
---|
434 | StringWriter writer = new StringWriter();
|
---|
435 | StreamResult result = new StreamResult(writer);
|
---|
436 | TransformerFactory tf = TransformerFactory.newInstance();
|
---|
437 | Transformer transformer = tf.newTransformer();
|
---|
438 | transformer.transform(domSource, result);
|
---|
439 | content = writer.toString();
|
---|
440 | System.out.println("Change the & to &Amp; for proper debug dispay") ;
|
---|
441 | content = content.replaceAll("&", "&");
|
---|
442 | writer.flush();
|
---|
443 | }
|
---|
444 | catch(TransformerException ex)
|
---|
445 | {
|
---|
446 | ex.printStackTrace();
|
---|
447 | return null;
|
---|
448 | }
|
---|
449 | return content;
|
---|
450 | }
|
---|
451 |
|
---|
452 |
|
---|
453 | protected Document getPreprocessDoc() throws Exception {
|
---|
454 |
|
---|
455 | File xslt_file = new File(preprocess_xsl_filename) ;
|
---|
456 |
|
---|
457 | FileReader reader = new FileReader(xslt_file);
|
---|
458 | InputSource xml_source = new InputSource(reader);
|
---|
459 | this.parser.parse(xml_source);
|
---|
460 | Document doc = this.parser.getDocument();
|
---|
461 |
|
---|
462 | return doc ;
|
---|
463 | }
|
---|
464 |
|
---|
465 | protected Document getLibraryDoc() throws Exception {
|
---|
466 | Document doc = null;
|
---|
467 | File xslt_file = new File(this.getLibraryXSLFilename()) ;
|
---|
468 |
|
---|
469 | FileReader reader = new FileReader(xslt_file);
|
---|
470 | InputSource xml_source = new InputSource(reader);
|
---|
471 | this.parser.parse(xml_source);
|
---|
472 |
|
---|
473 | doc = this.parser.getDocument();
|
---|
474 | return doc ;
|
---|
475 | }
|
---|
476 |
|
---|
477 | protected String getXSLTFileName(String action, String subaction,
|
---|
478 | String collection) {
|
---|
479 |
|
---|
480 | String name = null;
|
---|
481 | if (!subaction.equals("")) {
|
---|
482 | String key = action+":"+subaction;
|
---|
483 | name = (String) this.xslt_map.get(key);
|
---|
484 | }
|
---|
485 | // try the action by itself
|
---|
486 | if (name==null) {
|
---|
487 | name = (String) this.xslt_map.get(action);
|
---|
488 | }
|
---|
489 | // now find the absolute path
|
---|
490 | String stylesheet = GSFile.stylesheetFile(GlobalProperties.getGSDL3Home(), (String)this.config_params.get(GSConstants.SITE_NAME), collection, (String)this.config_params.get(GSConstants.INTERFACE_NAME), base_interfaces, name);
|
---|
491 | if (stylesheet==null) {
|
---|
492 | logger.info(" cant find stylesheet for "+name);
|
---|
493 | }
|
---|
494 | return stylesheet;
|
---|
495 | }
|
---|
496 |
|
---|
497 | // returns the library.xsl path of the library file that is applicable for the current interface
|
---|
498 | protected String getLibraryXSLFilename() {
|
---|
499 | return GSFile.xmlTransformDir(GSFile.interfaceHome(
|
---|
500 | GlobalProperties.getGSDL3Home(), (String)this.config_params.get(GSConstants.INTERFACE_NAME)))
|
---|
501 | + File.separatorChar + "library.xsl";
|
---|
502 | }
|
---|
503 |
|
---|
504 | // Call this when a FileNotFoundException could be thrown when loading an xsl (xml) file.
|
---|
505 | // Returns an error xhtml page indicating which xsl (or other xml) file is missing.
|
---|
506 | protected Document fileNotFoundErrorPage(String filenameMessage) {
|
---|
507 | String errorMessage = "ERROR missing file: " + filenameMessage;
|
---|
508 | Element errPage = XMLTransformer.constructErrorXHTMLPage(errorMessage);
|
---|
509 | logger.error(errorMessage);
|
---|
510 | System.err.println("****" + errorMessage);
|
---|
511 | return errPage.getOwnerDocument();
|
---|
512 | }
|
---|
513 | }
|
---|