1 | package org.greenstone.gsdl3.core;
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2 |
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3 | import org.greenstone.util.GlobalProperties;
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4 | import org.greenstone.gsdl3.util.*;
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5 | import org.greenstone.gsdl3.action.*;
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6 | // XML classes
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7 | import org.w3c.dom.Node;
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8 | import org.w3c.dom.NodeList;
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9 | import org.w3c.dom.Document;
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10 | import org.w3c.dom.Element;
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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.util.HashMap;
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15 | import java.util.Enumeration;
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16 | import java.util.ArrayList;
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17 |
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18 | import org.apache.log4j.*;
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19 |
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20 | /**
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21 | * the most basic Receptionist, used for interface generation. Receives requests
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22 | * consisting of an xml representation of cgi args, and returns the page of
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23 | * data. The requests are processed by the appropriate action class
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24 | *
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25 | * @see Action
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26 | */
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27 | public class Receptionist implements ModuleInterface
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28 | {
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29 |
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30 | static Logger logger = Logger.getLogger(org.greenstone.gsdl3.core.Receptionist.class.getName());
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31 |
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32 | /** the set up variables */
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33 | protected HashMap<String, Comparable> config_params = null;
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34 | /** container Document to create XML Nodes */
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35 | protected Document doc = null;
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36 |
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37 | /** a converter class to parse XML and create Docs */
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38 | protected XMLConverter converter = null;
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39 |
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40 | /** the message router that the Receptionist and Actions will talk to */
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41 | protected ModuleInterface mr = null;
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42 |
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43 | /** the list of actions */
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44 | protected HashMap<String, Action> action_map = null;
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45 |
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46 | /** the list of params */
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47 | protected GSParams params = null;
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48 | protected Element language_list = null;
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49 |
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50 | /** the list of interfaces this is based on */
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51 | protected ArrayList<String> base_interfaces = null;
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52 |
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53 | public Receptionist()
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54 | {
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55 | this.converter = new XMLConverter();
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56 | this.doc = this.converter.newDOM();
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57 | this.action_map = new HashMap<String, Action>();
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58 | }
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59 |
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60 | public void cleanUp()
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61 | {
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62 | if (this.mr != null)
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63 | {
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64 | this.mr.cleanUp();
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65 | }
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66 | }
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67 |
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68 | public void setParams(GSParams params)
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69 | {
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70 | this.params = params;
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71 | }
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72 |
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73 | public void setConfigParams(HashMap<String, Comparable> params)
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74 | {
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75 | this.config_params = params;
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76 | }
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77 |
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78 | public HashMap<String, Comparable> getConfigParams()
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79 | {
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80 | return this.config_params;
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81 | }
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82 |
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83 | /**
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84 | * sets the message router - it should already be created and configured
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85 | * before being passed to the receptionist
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86 | */
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87 | public void setMessageRouter(ModuleInterface m)
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88 | {
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89 | this.mr = m;
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90 | }
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91 |
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92 | /**
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93 | * gets the message router
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94 | */
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95 | public ModuleInterface getMessageRouter()
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96 | {
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97 | return this.mr;
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98 | }
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99 |
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100 | /** configures the receptionist */
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101 | public boolean configure()
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102 | {
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103 |
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104 | if (this.config_params == null)
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105 | {
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106 | logger.error(" config variables must be set before calling configure");
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107 | return false;
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108 | }
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109 | if (this.mr == null)
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110 | {
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111 | logger.error(" message router must be set before calling configure");
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112 | return false;
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113 | }
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114 |
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115 | // find the config file containing a list of actions
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116 | File interface_config_file = new File(GSFile.interfaceConfigFile(GSFile.interfaceHome(GlobalProperties.getGSDL3Home(), (String) this.config_params.get(GSConstants.INTERFACE_NAME))));
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117 | if (!interface_config_file.exists())
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118 | {
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119 | logger.error(" interface config file: " + interface_config_file.getPath() + " not found!");
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120 | return false;
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121 | }
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122 |
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123 | Document config_doc = this.converter.getDOM(interface_config_file);
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124 | if (config_doc == null)
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125 | {
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126 | logger.error(" could not parse interface config file: " + interface_config_file.getPath());
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127 | return false;
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128 | }
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129 | Element config_elem = config_doc.getDocumentElement();
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130 | String base_interface = config_elem.getAttribute("baseInterface");
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131 | setUpBaseInterface(base_interface);
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132 | setUpInterfaceOptions(config_elem);
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133 |
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134 | // load up the actions
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135 | Element action_list = (Element) GSXML.getChildByTagName(config_elem, GSXML.ACTION_ELEM + GSXML.LIST_MODIFIER);
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136 | NodeList actions = action_list.getElementsByTagName(GSXML.ACTION_ELEM);
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137 |
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138 | for (int i = 0; i < actions.getLength(); i++)
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139 | {
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140 | Element action = (Element) actions.item(i);
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141 | String class_name = action.getAttribute("class");
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142 | String action_name = action.getAttribute("name");
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143 | Action ac = null;
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144 | try
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145 | {
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146 | ac = (Action) Class.forName("org.greenstone.gsdl3.action." + class_name).newInstance();
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147 | }
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148 | catch (Exception e)
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149 | {
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150 | logger.error(" couldn't load in action " + class_name);
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151 | e.printStackTrace();
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152 | continue;
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153 | }
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154 | ac.setConfigParams(this.config_params);
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155 | ac.setMessageRouter(this.mr);
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156 | ac.configure();
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157 | ac.addActionParameters(this.params);
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158 | this.action_map.put(action_name, ac);
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159 | }
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160 |
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161 | this.language_list = (Element) GSXML.getChildByTagName(config_elem, "languageList");
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162 | if (language_list == null)
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163 | {
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164 | logger.error(" didn't find a language list in the config file!!");
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165 | }
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166 |
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167 | return true;
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168 | }
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169 |
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170 | public String process(String xml_in)
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171 | {
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172 |
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173 | Node message_node = this.converter.getDOM(xml_in);
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174 | Node page = process(message_node);
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175 | return this.converter.getString(page);
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176 | }
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177 |
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178 | /**
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179 | * process - produce a page of data in response to a request if something
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180 | * goes wrong, it returns null - TODO: return a suitable message to the user
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181 | */
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182 | public Node process(Node message_node)
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183 | {
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184 | Element message = this.converter.nodeToElement(message_node);
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185 |
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186 | // get the request out of the message - assume that there is only one
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187 | Element request = (Element) GSXML.getChildByTagName(message, GSXML.REQUEST_ELEM);
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188 | if (request == null)
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189 | {
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190 | logger.error(" message had no request!");
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191 | return null;
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192 | }
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193 | // check the request type
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194 | String type = request.getAttribute(GSXML.TYPE_ATT); // returns "" if no att of this name
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195 | if (type.equals(GSXML.REQUEST_TYPE_SECURITY))
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196 | {
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197 | return this.mr.process(message);
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198 | }
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199 |
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200 | if (!type.equals(GSXML.REQUEST_TYPE_PAGE))
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201 | {
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202 | // now Receptionist forwards non-page requests straight to the MR, and returns the responses
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203 | logger.error(" request type is not '" + GSXML.REQUEST_TYPE_PAGE + "', but it is '" + type + "', so forwarding the message to the MR!");
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204 | // process the whole message - mr needs <message> tags, and
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205 | // in this case, there may be more than one request in the message
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206 | return this.mr.process(message);
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207 | }
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208 | // work out which action to pass to
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209 | String action = request.getAttribute(GSXML.ACTION_ATT);
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210 | if (action.equals(""))
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211 | {
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212 | logger.error(" no action specified in the request!");
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213 | return null;
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214 | }
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215 |
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216 | // find the appropriate action
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217 | Action a = this.action_map.get(action);
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218 |
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219 | String action_name = null;
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220 | if (a == null)
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221 | { // not in the map yet
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222 | // try to load a new action
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223 | try
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224 | {
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225 | action_name = action.substring(0, 1).toUpperCase() + action.substring(1) + "Action";
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226 | Action ac = (Action) Class.forName("org.greenstone.gsdl3.action." + action_name).newInstance();
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227 | ac.setConfigParams(this.config_params);
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228 | ac.setMessageRouter(this.mr);
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229 | ac.configure();
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230 | ac.addActionParameters(this.params);
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231 | this.action_map.put(action, ac);
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232 | a = ac;
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233 | }
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234 | catch (Exception e)
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235 | {
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236 |
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237 | logger.error(" a new action (" + action_name + ") was specified and it couldn't be created. Error message:" + e.getMessage());
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238 | return null;
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239 | }
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240 | }
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241 | // transform the request in some way -- does nothing!
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242 | preProcessRequest(request);
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243 | // set up the page
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244 | Element page = this.doc.createElement(GSXML.PAGE_ELEM);
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245 | page.setAttribute(GSXML.LANG_ATT, request.getAttribute(GSXML.LANG_ATT));
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246 | // just in case these namespaces end up in the page and we want to display the XML
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247 | page.setAttribute("xmlns:gsf", "http://www.greenstone.org/greenstone3/schema/ConfigFormat");
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248 | page.setAttribute("xmlns:xsl", "http://www.w3.org/1999/XSL/Transform");
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249 |
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250 | //logger.info(a+" mesa=" + this.converter.getPrettyString(message));
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251 | // get the page data from the action
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252 |
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253 | Node action_response = a.process(message);
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254 | boolean response_only = false;
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255 | Element param_list = (Element) GSXML.getChildByTagName(request, GSXML.PARAM_ELEM + GSXML.LIST_MODIFIER);
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256 | if (param_list != null)
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257 | {
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258 | Element param = GSXML.getNamedElement(param_list, GSXML.PARAM_ELEM, GSXML.NAME_ATT, "ro");
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259 | if (param != null)
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260 | {
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261 | String value = param.getAttribute("value");
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262 | if (value.equals("1"))
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263 | {
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264 | response_only = true;
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265 | }
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266 | }
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267 | }
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268 | if (response_only)
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269 | {
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270 | // only the response from the action is sent back
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271 | return action_response;
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272 | }
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273 |
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274 | // the request is part of the page
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275 | page.appendChild(GSXML.duplicateWithNewName(this.doc, request, GSXML.PAGE_REQUEST_ELEM, true));
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276 | // add the response too
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277 | Element page_response = GSXML.duplicateWithNewName(this.doc, (Element) GSXML.getChildByTagName(action_response, GSXML.RESPONSE_ELEM), GSXML.PAGE_RESPONSE_ELEM, true);
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278 | page.appendChild(page_response);
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279 |
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280 | //logger.info(" raw page="+this.converter.getString(page));
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281 | // transform the result in some way
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282 | //Element resulting_page = postProcessPage(page);
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283 |
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284 | Node resulting_page = postProcessPage(page);
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285 |
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286 | //logger.debug("receptionist returned response");
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287 | //logger.error("receptionist returned response");
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288 | //logger.debug(this.converter.getString(resulting_page));
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289 | //logger.error(this.converter.getString(resulting_page));
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290 | // logger.info("receptionist returned response");
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291 | // logger.info(this.converter.getString(resulting_page));
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292 | return resulting_page;
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293 | }
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294 |
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295 | protected boolean setUpBaseInterface(String base_interface)
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296 | {
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297 | if (base_interface == null || base_interface.equals(""))
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298 | {
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299 | // there was no base interface, the list remains null
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300 | return true;
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301 | }
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302 | // foreach base interface
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303 | while (!base_interface.equals(""))
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304 | {
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305 | // find the base interface config file
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306 | File base_interface_config_file = new File(GSFile.interfaceConfigFile(GSFile.interfaceHome(GlobalProperties.getGSDL3Home(), base_interface)));
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307 | if (!base_interface_config_file.exists())
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308 | {
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309 | logger.error(" base interface config file: " + base_interface_config_file.getPath() + " not found!");
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310 | return false;
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311 | }
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312 | // the interface name is valid, add it to the list
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313 | if (base_interfaces == null)
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314 | {
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315 | base_interfaces = new ArrayList<String>();
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316 | }
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317 | base_interfaces.add(base_interface);
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318 | // now see if this has a base interface
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319 | Document config_doc = this.converter.getDOM(base_interface_config_file);
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320 | if (config_doc == null)
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321 | {
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322 | logger.error(" could not parse base interface config file: " + base_interface_config_file.getPath());
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323 | return false;
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324 | }
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325 | Element config_elem = config_doc.getDocumentElement();
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326 | base_interface = config_elem.getAttribute("baseInterface");
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327 | }
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328 | return true;
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329 | }
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330 |
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331 | protected boolean setUpInterfaceOptions(Element config_elem)
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332 | {
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333 | Element option_list = (Element) GSXML.getChildByTagName(config_elem, "optionList");
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334 | if (option_list != null)
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335 | {
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336 | logger.debug("found an interface optionList");
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337 | // we set any options in the config params
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338 | NodeList options = option_list.getElementsByTagName("option");
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339 | for (int i = 0; i < options.getLength(); i++)
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340 | {
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341 | Element option = (Element) options.item(i);
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342 | String name = option.getAttribute(GSXML.NAME_ATT);
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343 | String value = option.getAttribute(GSXML.VALUE_ATT);
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344 | logger.debug("option: " + name + ", " + value);
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345 | if (!name.equals("") && !value.equals(""))
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346 | {
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347 | this.config_params.put(name, value);
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348 | }
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349 | }
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350 | }
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351 |
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352 | return true;
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353 | }
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354 |
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355 | protected void preProcessRequest(Element request)
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356 | {
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357 | return;
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358 | }
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359 |
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360 | protected Node postProcessPage(Element page)
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361 | {
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362 | return page;
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363 | }
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364 |
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365 | }
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