1 | /*
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2 | * Created on Nov 22, 2004
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3 | * Copyright (C) Andrea Schweer, 2004
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4 | *
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5 | * This file is part of the Greenstone Alerting Service.
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6 | * Refer to the COPYING file in the base directory of this package
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7 | * for licensing information.
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8 | */
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9 | package org.greenstone.gsdlas;
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10 |
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11 | import java.lang.reflect.Method;
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12 | import java.net.URL;
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13 | import java.sql.SQLException;
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14 | import java.util.*;
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15 |
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16 | import javax.servlet.ServletConfig;
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17 | import javax.servlet.ServletException;
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18 | import javax.servlet.http.*;
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19 |
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20 | import org.apache.velocity.Template;
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21 | import org.apache.velocity.context.Context;
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22 | import org.apache.velocity.servlet.VelocityServlet;
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23 | import org.greenstone.gsdlas.database.DatabaseException;
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24 | import org.greenstone.gsdlas.profiles.Predicate;
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25 | import org.greenstone.gsdlas.profiles.Subscription;
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26 | import org.greenstone.gsdlas.users.UserManagementException;
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27 | import org.greenstone.gsdlas.users.UserManager;
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28 | import org.greenstone.gsdlas.util.ArrayHelper;
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29 |
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30 | /**
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31 | * @author schweer
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32 | *
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33 | * TODO To change the template for this generated type comment go to
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34 | * Window - Preferences - Java - Code Style - Code Templates
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35 | */
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36 | public class AlertingService extends VelocityServlet {
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37 |
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38 | /* (non-Javadoc)
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39 | * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
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40 | */
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41 | public void init(ServletConfig config) throws ServletException {
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42 | super.init(config);
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43 | System.out.println("reloading subs");
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44 | ProfileStore.getInstance().restoreFromDatabase();
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45 | try {
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46 | Set subs = ProfileStore.getInstance().getAllSubscriptionsFor("andrea");
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47 | System.out.println("reloaded " + subs.size() + " subs for andrea: ");
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48 | for (Iterator iter = subs.iterator(); iter.hasNext();) {
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49 | System.out.println(iter.next());
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50 | }
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51 | } catch (DatabaseException e) {
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52 | // TODO Auto-generated catch block
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53 | e.printStackTrace();
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54 | }
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55 | }
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56 | public static final String[] actions = new String[] {
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57 | "createSubscription",
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58 | "deleteSubscription",
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59 | "editSubscription",
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60 | "showEvents",
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61 | "showFeed",
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62 | "listSubscriptions",
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63 | "login",
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64 | "register",
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65 | "logout",
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66 | "showLoginForm",
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67 | "showRegistrationForm"
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68 | };
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69 |
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70 |
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71 | protected Template handleRequest(HttpServletRequest req,
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72 | HttpServletResponse res, Context context) {
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73 |
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74 | String action = req.getParameter(Constants.ACTION_PARAM);
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75 |
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76 | Map args = req.getParameterMap();
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77 |
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78 | if (action != null && action.equals("receiveEvent")) {
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79 | receiveEvent(args);
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80 | return null;
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81 | }
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82 |
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83 | args = normalise(args);
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84 |
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85 | if (action == null || !ArrayHelper.contains(actions, action)) {
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86 | String title = "Unknown action";
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87 | String message = "I don't know how to " + action;
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88 | String details = "The only actions I know are " + Arrays.toString(actions);
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89 | return showError(context, message, details);
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90 | }
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91 |
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92 | String templateString = "";
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93 |
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94 | try {
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95 | Method method = AlertingService.class.getDeclaredMethod(action, new Class[] {Map.class, Context.class});
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96 | templateString = (String) method.invoke(this, new Object[] {args, context});
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97 | } catch (Exception e) {
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98 | String message = "An error has occured, I couldn't do what you told me to do.";
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99 | String details = e.getMessage() + " (" + e.getClass().getName() + "); "
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100 | + e.getCause()
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101 | + " ; action is " + action;
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102 | return showError(context, message, details);
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103 | }
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104 |
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105 | Template template = null;
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106 | try {
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107 | template = getTemplate(templateString);
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108 | } catch (Exception e) {
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109 | // TODO Auto-generated catch block
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110 | e.printStackTrace();
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111 | try {
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112 | error((HttpServletRequest)context.get(REQUEST),
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113 | (HttpServletResponse)context.get(RESPONSE),
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114 | e);
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115 | } catch (Exception e2) {
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116 | // TODO Auto-generated catch block
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117 | e2.printStackTrace();
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118 | }
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119 | }
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120 | return template;
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121 | }
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122 |
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123 | /**
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124 | * @param arguments
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125 | * @param context
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126 | * @return the Velocity template to use
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127 | * @throws Exception
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128 | */
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129 | public String createSubscription(Map arguments, Context context) throws Exception {
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130 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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131 | if (!UserManager.getInstance().isLoggedIn(session)) {
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132 | session.setAttribute("next_action", "createSubscription");
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133 | return showLoginForm(arguments, context);
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134 | }
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135 | if (arguments.containsKey("next_page") && arguments.get("next_page").equals("finish")) {
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136 | arguments.putAll(getPageArgsFromSession(session));
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137 | arguments.put("username", session.getAttribute("username"));
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138 | ProfileStore.getInstance().createSubscription(arguments);
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139 | return listSubscriptions(arguments, context);
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140 | } else {
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141 | return showSubscriptionWizardPage(arguments, context, true);
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142 | }
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143 | }
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144 |
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145 | public String deleteSubscription(Map arguments, Context context) {
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146 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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147 | if (!UserManager.getInstance().isLoggedIn(session)) {
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148 | session.setAttribute("next_action", "deleteSubscription");
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149 | return showLoginForm(arguments, context);
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150 | }
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151 | String subscriptionID = (String) arguments.get("subscriptionID");
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152 | try {
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153 | ProfileStore.getInstance().deleteSubscription(subscriptionID);
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154 | } catch (DatabaseException e) {
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155 | // TODO Auto-generated catch block
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156 | e.printStackTrace();
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157 | } catch (SQLException e) {
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158 | // TODO Auto-generated catch block
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159 | e.printStackTrace();
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160 | }
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161 | return listSubscriptions(arguments, context);
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162 | }
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163 |
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164 | public String editSubscription(Map arguments, Context context) throws Exception {
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165 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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166 | if (!UserManager.getInstance().isLoggedIn(session)) {
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167 | session.setAttribute("next_action", "editSubscription");
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168 | return showLoginForm(arguments, context);
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169 | }
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170 | if (arguments.containsKey("next_page") && arguments.get("next_page").equals("finish")) {
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171 | ProfileStore.getInstance().changeSubscription(arguments, session);
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172 | return listSubscriptions(arguments, context);
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173 | } else {
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174 | return showSubscriptionWizardPage(arguments, context, false);
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175 | }
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176 | }
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177 |
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178 | public String showFeed(Map arguments, Context context) throws NumberFormatException, DatabaseException, SQLException {
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179 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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180 | if (!UserManager.getInstance().isLoggedIn(session)) {
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181 | session.setAttribute("next_action", "showFeed");
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182 | return showLoginForm(arguments, context);
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183 | }
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184 | String subscriptionID = (String) arguments.get("subscriptionID");
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185 | Integer subID = new Integer(subscriptionID);
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186 | Set events = EventStore.getInstance().getEvents(subID);
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187 | context.put("list", events);
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188 | context.put("subscription", ProfileStore.getInstance().getSubscription(subID.intValue()));
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189 | HttpServletResponse res = (HttpServletResponse) context.get(RESPONSE);
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190 | res.setContentType("text/xml");
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191 | return "feed.vm";
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192 | }
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193 |
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194 | public String showEvents(Map arguments, Context context) throws NumberFormatException, DatabaseException, SQLException {
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195 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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196 | if (!UserManager.getInstance().isLoggedIn(session)) {
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197 | session.setAttribute("next_action", "showEvents");
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198 | return showLoginForm(arguments, context);
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199 | }
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200 | String subscriptionID = (String) arguments.get("subscriptionID");
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201 | Integer subID = new Integer(subscriptionID);
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202 | Set events = EventStore.getInstance().getEvents(subID);
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203 | context.put("list", events);
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204 | context.put("subscription", ProfileStore.getInstance().getSubscription(subID.intValue()));
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205 | return "events.vm";
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206 | }
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207 |
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208 | public String showLoginForm(Map arguments, Context context) {
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209 | return "login.vm";
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210 | }
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211 |
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212 | public String showRegistrationForm(Map arguments, Context context) {
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213 | return "register.vm";
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214 | }
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215 |
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216 | public String listSubscriptions(Map arguments, Context context) {
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217 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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218 | if (!UserManager.getInstance().isLoggedIn(session)) {
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219 | session.setAttribute("next_action", "listSubscriptions");
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220 | return showLoginForm(arguments, context);
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221 | }
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222 | String username = (String) session.getAttribute("username");
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223 | context.put("title", "List of Subscriptions for " + username);
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224 | try {
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225 | Collection subscriptions = ProfileStore.getInstance().getAllSubscriptionsFor(username);
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226 | context.put("list", subscriptions);
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227 | return "list.vm";
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228 | } catch (DatabaseException de) {
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229 | context.put("message", "couldn't get list of subscriptions for " + username);
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230 | context.put("details", de.getMessage());
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231 | return "error.vm";
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232 | }
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233 | }
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234 |
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235 | public String login(Map arguments, Context context) throws Exception {
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236 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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237 | try {
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238 | UserManager.getInstance().loginUser(arguments, session);
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239 | } catch (UserManagementException e) {
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240 | context.put("error", Boolean.TRUE);
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241 | context.put("errormessage", e.getMessage());
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242 | return showLoginForm(arguments, context);
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243 | }
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244 | if (session.getAttribute("next_action") != null) {
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245 | String nextAction = (String) session.getAttribute("next_action");
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246 | Method method = AlertingService.class.getDeclaredMethod(nextAction, new Class[] {Map.class, Context.class});
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247 | return (String) method.invoke(this, new Object[] {arguments, context});
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248 | }
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249 | return listSubscriptions(arguments, context);
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250 | }
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251 |
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252 | public String register(Map arguments, Context context) throws Exception {
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253 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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254 | try {
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255 | UserManager.getInstance().createUser(arguments, session);
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256 | } catch (UserManagementException e) {
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257 | context.put("error", Boolean.TRUE);
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258 | context.put("errormessage", e.getMessage());
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259 | return showRegistrationForm(arguments, context);
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260 | }
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261 | return login(arguments, context);
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262 | }
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263 |
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264 | public String logout(Map arguments, Context context) {
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265 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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266 | Enumeration atts = session.getAttributeNames();
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267 | while (atts.hasMoreElements()) {
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268 | session.removeAttribute((String) atts.nextElement());
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269 | }
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270 | session.invalidate();
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271 | return "general.vm";
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272 | }
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273 |
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274 | public void receiveEvent(Map rawEvent) {
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275 | Map event = new TreeMap();
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276 | for (Iterator iter = rawEvent.keySet().iterator(); iter.hasNext();) {
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277 | String key = (String) iter.next();
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278 | if (key.equals("action")) continue; // we don't want this
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279 | String[] value = (String[]) rawEvent.get(key);
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280 | event.put(key, value[0]);
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281 | }
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282 | System.out.println("receiving event " + event);
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283 |
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284 | GreenstoneCommunicator gsComm = null;
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285 | try {
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286 | String hostID = (String) event.get(Constants.HOST_ID_FIELD);
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287 | gsComm = new GreenstoneCommunicator(new URL(hostID));
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288 | } catch (Exception e) {
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289 | System.err.println("Can't communicate to Greenstone: " + e.getMessage());
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290 | e.printStackTrace();
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291 | }
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292 |
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293 | Set matchedSubscriptions = ProfileStore.getInstance().filter(event, gsComm);
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294 |
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295 | try {
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296 | EventStore.getInstance().add(event, matchedSubscriptions);
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297 | Notifier.getInstance().sendNotifications(event, matchedSubscriptions);
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298 | } catch (Exception e) {
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299 | System.err.println("Couldn't save events: " + e.getMessage());
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300 | e.printStackTrace();
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301 | }
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302 | System.out.println(matchedSubscriptions.size() + " matching subscriptions: " + matchedSubscriptions);
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303 | }
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304 |
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305 | /**
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306 | * @param args
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307 | */
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308 | private Map normalise(Map args) {
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309 | Map result = new TreeMap();
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310 | for (Iterator iter = args.keySet().iterator(); iter.hasNext();) {
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311 | String key = (String) iter.next();
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312 | if (Predicate.isMultiValued(key) || key.equals("way")) {
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313 | // multi-valued attributes
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314 | String[] values = ((String[]) args.get(key));
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315 | result.put(key, Arrays.asList(values));
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316 | } else {
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317 | String firstValue = ((String[])args.get(key))[0];
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318 | result.put(key, firstValue);
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319 | }
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320 | }
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321 | return result;
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322 | }
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323 |
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324 | /**
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325 | * @param context
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326 | * @param message
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327 | * @param details
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328 | * @return
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329 | */
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330 | private Template showError(Context context, String message, String details) {
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331 | context.put("title", "Error");
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332 | context.put("message", message);
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333 | context.put("details", details);
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334 | try {
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335 | return getTemplate("error.vm");
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336 | } catch (Exception e) {
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337 | try {
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338 | super.error((HttpServletRequest)context.get("req"),
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339 | (HttpServletResponse)context.get("res"),
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340 | e);
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341 | } catch (Exception e2) {
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342 | e2.printStackTrace();
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343 | }
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344 | }
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345 | return null;
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346 | }
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347 |
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348 | /**
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349 | * @param arguments
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350 | * @param context
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351 | * @param create
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352 | * @return
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353 | * @throws Exception
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354 | */
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355 | private String showSubscriptionWizardPage(Map arguments, Context context, boolean create) throws Exception {
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356 | HttpSession session = ((HttpServletRequest)context.get(REQUEST)).getSession(true);
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357 | if (create) {
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358 | context.put(Constants.ACTION_PARAM, "createSubscription");
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359 | } else {
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360 | // prefill from existing subscription
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361 | context.put(Constants.ACTION_PARAM, "editSubscription");
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362 | String subscriptionID = (String) arguments.get("subscriptionID");
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363 | int subID = Integer.parseInt(subscriptionID);
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364 | prefillFromSubscription(session, subID);
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365 | }
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366 | if (!arguments.containsKey("current_page")) {
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367 | return "sub_type-details.vm";
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368 | }
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369 |
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370 | String currentPage = (String) arguments.get("current_page");
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371 | String direction = (String) arguments.get("next_page");
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372 |
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373 | if (arguments.containsKey(Constants.HOST_QUERY_FIELD)) {
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374 | String hostQuery = (String) arguments.get(Constants.HOST_QUERY_FIELD);
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375 | if (hostQuery != null && hostQuery.length() != 0)
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376 | arguments.remove(Constants.HOST_ID_FIELD);
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377 | }
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378 | if (arguments.containsKey(Constants.COLLECTION_QUERY_FIELD)) {
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379 | String collQuery = (String) arguments.get(Constants.COLLECTION_QUERY_FIELD);
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380 | if (collQuery != null && collQuery.length() != 0)
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381 | arguments.remove(Constants.COLLECTION_ID_FIELD);
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382 | }
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383 |
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384 | // save page arguments
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385 | savePageArgsToSession(currentPage, arguments, session);
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386 |
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387 | String nextPage = getNextPage(currentPage, direction);
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388 |
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389 | // fill prefill
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390 | context.put("prefill", getPageArgsFromSession(nextPage, session));
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391 |
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392 | // fill preview
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393 | context.put("preview", getPagePreview(nextPage, session));
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394 |
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395 | // get page-specific stuff
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396 | if (nextPage.equals("host")) {
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397 | String[] hostNames;
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398 | try {
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399 | GreenstoneCommunicator gsComm = new GreenstoneCommunicator();
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400 | hostNames = gsComm.getHostNames();
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401 | } catch (Exception e) {
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402 | hostNames = new String[] { "localhost" };
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403 | }
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404 | context.put("hostnames", hostNames);
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405 | session.setAttribute("hostnames", hostNames);
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406 | } else if (nextPage.equals("collection")) {
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407 | List hostNames = (List) arguments.get(Constants.HOST_ID_FIELD);
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408 | if (hostNames == null || hostNames.isEmpty()) {
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409 | hostNames = new Vector();
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410 | // no host names -> use host query
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411 | String[] hostsFromSession = (String[]) session.getAttribute("hostnames");
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412 | if (hostsFromSession == null || hostsFromSession.length == 0) {
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413 | try {
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414 | GreenstoneCommunicator gsComm = new GreenstoneCommunicator();
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415 | hostsFromSession = gsComm.getHostNames();
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416 | } catch (Exception e) {
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417 | hostsFromSession = new String[] { "localhost" };
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418 | }
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419 | }
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420 | String hostQuery = (String) arguments.get(Constants.HOST_QUERY_FIELD);
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421 | for (int i = 0; i < hostsFromSession.length; i++) {
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422 | if (hostsFromSession[i] != null && hostsFromSession[i].indexOf(hostQuery) >= 0) {
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423 | hostNames.add(hostsFromSession[i]);
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424 | }
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425 | }
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426 | }
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427 |
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428 | Map collNames = new TreeMap();
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429 | for (Iterator iter = hostNames.iterator(); iter.hasNext();) {
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430 | String host = (String) iter.next();
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431 | Set collNamesForHost = new TreeSet();
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432 | try {
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433 | URL url = new URL("http://" + host + ":8080/soap/servlet/rpcrouter");
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434 | GreenstoneCommunicator gsComm = new GreenstoneCommunicator(url);
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435 | collNamesForHost.addAll(Arrays.asList(gsComm.getCollectionNames()));
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436 | } catch (Exception e) {
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437 | // TODO Auto-generated catch block
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438 | e.printStackTrace();
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439 | }
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440 | collNames.put(host, collNamesForHost);
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441 | }
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442 | context.put("collectionnames", collNames);
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443 | context.put("hostnames", hostNames);
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444 | }
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445 |
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446 | return "sub_" + nextPage + ".vm";
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447 | }
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448 |
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449 | /**
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450 | * @param session
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451 | * @param subID
|
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452 | */
|
---|
453 | private void prefillFromSubscription(HttpSession session, int subID) {
|
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454 | Subscription sub = ProfileStore.getInstance().getSubscription(subID);
|
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455 | Map typeArgs = new HashMap();
|
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456 | // TODO really fill stuff
|
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457 | savePageArgsToSession("type-details", typeArgs, session);
|
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458 | Map hostArgs = new HashMap();
|
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459 | savePageArgsToSession("host", hostArgs, session);
|
---|
460 | Map collArgs = new HashMap();
|
---|
461 | savePageArgsToSession("collection", collArgs, session);
|
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462 | Map notificationArgs = new HashMap();
|
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463 | savePageArgsToSession("notification", notificationArgs, session);
|
---|
464 | }
|
---|
465 |
|
---|
466 | /**
|
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467 | * @param nextPage
|
---|
468 | * @param session
|
---|
469 | * @return
|
---|
470 | */
|
---|
471 | private Map getPagePreview(String nextPage, HttpSession session) {
|
---|
472 | Map preview = new TreeMap();
|
---|
473 | if (nextPage.equals("type-details")) {
|
---|
474 | return preview;
|
---|
475 | }
|
---|
476 | preview.putAll(getPageArgsFromSession("type-details", session));
|
---|
477 | if (nextPage.equals("host")) {
|
---|
478 | return preview;
|
---|
479 | }
|
---|
480 | preview.putAll(getPageArgsFromSession("host", session));
|
---|
481 | if (nextPage.equals("collection")) {
|
---|
482 | return preview;
|
---|
483 | }
|
---|
484 | preview.putAll(getPageArgsFromSession("collection", session));
|
---|
485 | return preview;
|
---|
486 | }
|
---|
487 |
|
---|
488 | /**
|
---|
489 | * @param currentPage
|
---|
490 | * @param direction
|
---|
491 | * @return
|
---|
492 | * @throws Exception
|
---|
493 | */
|
---|
494 | private String getNextPage(String currentPage, String direction) throws Exception {
|
---|
495 | String nextPage;
|
---|
496 | if (currentPage.equals("host") && direction.equals("back")) {
|
---|
497 | nextPage = "type-details";
|
---|
498 | } else if (currentPage.equals("type-details") || (currentPage.equals("collection") && direction.equals("back"))) {
|
---|
499 | nextPage = "host";
|
---|
500 | } else if (currentPage.equals("host") || (currentPage.equals("notification") && direction.equals("back"))) {
|
---|
501 | nextPage = "collection";
|
---|
502 | } else if (currentPage.equals("collection")) {
|
---|
503 | nextPage = "notification";
|
---|
504 | } else {
|
---|
505 | throw new Exception("unknown combination of currentPage=" + currentPage + " and nextPage=" + direction);
|
---|
506 | }
|
---|
507 | return nextPage;
|
---|
508 | }
|
---|
509 |
|
---|
510 | /**
|
---|
511 | * @param page
|
---|
512 | * @param session
|
---|
513 | * @return
|
---|
514 | */
|
---|
515 | private Map getPageArgsFromSession(String page, HttpSession session) {
|
---|
516 | Map pageArgs = (Map) session.getAttribute("page_args");
|
---|
517 | if (pageArgs == null || !pageArgs.containsKey(page))
|
---|
518 | return new TreeMap();
|
---|
519 | return (Map) pageArgs.get(page);
|
---|
520 | }
|
---|
521 |
|
---|
522 | private Map getPageArgsFromSession(HttpSession session) {
|
---|
523 | Map result = new TreeMap();
|
---|
524 | Map pageArgs = (Map) session.getAttribute("page_args");
|
---|
525 | if (pageArgs != null) {
|
---|
526 | for (Iterator iter = pageArgs.values().iterator(); iter.hasNext();) {
|
---|
527 | Map args = (Map) iter.next();
|
---|
528 | result.putAll(args);
|
---|
529 | }
|
---|
530 | }
|
---|
531 | return result;
|
---|
532 | }
|
---|
533 |
|
---|
534 | /**
|
---|
535 | * @param page
|
---|
536 | * @param arguments
|
---|
537 | * @param session
|
---|
538 | */
|
---|
539 | private void savePageArgsToSession(String page, Map arguments, HttpSession session) {
|
---|
540 | Map pageArgs = (Map) session.getAttribute("page_args");
|
---|
541 | if (pageArgs == null) {
|
---|
542 | pageArgs = new TreeMap();
|
---|
543 | }
|
---|
544 | pageArgs.put(page, arguments);
|
---|
545 | session.setAttribute("page_args", pageArgs);
|
---|
546 | }
|
---|
547 | }
|
---|