1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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2 | // |
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3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 | // you may not use this file except in compliance with the License. |
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5 | // You may obtain a copy of the License at |
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6 | // |
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7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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8 | // |
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9 | // Unless required by applicable law or agreed to in writing, software |
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10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 | // See the License for the specific language governing permissions and |
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13 | // limitations under the License. |
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14 | |
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15 | package de.ugoe.cs.autoquest.genericeventmonitor; |
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16 | |
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17 | import java.io.IOException; |
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18 | import java.io.InputStream; |
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19 | import java.io.InputStreamReader; |
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20 | import java.net.MalformedURLException; |
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21 | import java.net.URL; |
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22 | import java.util.ArrayList; |
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23 | import java.util.HashMap; |
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24 | import java.util.List; |
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25 | import java.util.Map; |
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26 | import java.util.Set; |
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27 | |
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28 | import javax.servlet.ServletException; |
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29 | import javax.servlet.http.HttpServletRequest; |
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30 | import javax.servlet.http.HttpServletResponse; |
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31 | |
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32 | import org.eclipse.jetty.servlet.DefaultServlet; |
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33 | import org.json.simple.JSONArray; |
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34 | import org.json.simple.JSONObject; |
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35 | import org.json.simple.JSONValue; |
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36 | import org.json.simple.parser.ParseException; |
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37 | |
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38 | import de.ugoe.cs.util.console.Console; |
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39 | |
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40 | /** |
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41 | * <p> |
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42 | * the servlet deployed in the web server that receives all generic events. The messages are parsed, |
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43 | * validated, and forwarded to the provided message listener. If a message is not valid, it is |
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44 | * discarded. If an event in a message is not valid, it is discarded. Messages are only received via |
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45 | * the POST HTTP method. |
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46 | * </p> |
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47 | * |
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48 | * @author Patrick Harms |
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49 | */ |
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50 | class GenericEventMonitorServlet extends DefaultServlet { |
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51 | |
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52 | /** */ |
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53 | private static final long serialVersionUID = 1L; |
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54 | |
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55 | /** must be true to do some detailed logging of what the server does */ |
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56 | private static final boolean DO_TRACE = false; |
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57 | |
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58 | /** |
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59 | * the map of event target ids to the concrete target objects. |
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60 | */ |
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61 | private Map<String, GenericEventTarget> eventTargets = new HashMap<>(); |
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62 | |
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63 | /** |
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64 | * the message listener to forward received messages to. |
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65 | */ |
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66 | private GenericEventMonitorMessageListener messageListener; |
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67 | |
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68 | /** |
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69 | * <p> |
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70 | * initializes the servlet with the message listener to which all events shall be forwarded |
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71 | * </p> |
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72 | * |
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73 | * @param messageListener the message listener that shall receive all events |
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74 | */ |
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75 | GenericEventMonitorServlet(GenericEventMonitorMessageListener messageListener) { |
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76 | this.messageListener = messageListener; |
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77 | } |
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78 | |
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79 | /** |
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80 | * this implements handling of doPost. For this servlet this means that |
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81 | * the data from the post request will be parsed and validated. |
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82 | * |
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83 | * (non-Javadoc) |
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84 | * @see org.mortbay.jetty.servlet.DefaultServlet#doPost(HttpServletRequest, HttpServletResponse) |
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85 | */ |
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86 | @Override |
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87 | protected void doPost(HttpServletRequest request, HttpServletResponse response) |
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88 | throws ServletException, IOException |
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89 | { |
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90 | Object value = null; |
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91 | try { |
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92 | //InputStream requestInputStream = dumpStreamContent(request.getInputStream()); |
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93 | InputStream requestInputStream = request.getInputStream(); |
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94 | |
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95 | value = JSONValue.parseWithException |
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96 | (new InputStreamReader(requestInputStream, "UTF-8")); |
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97 | |
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98 | if (!(value instanceof JSONObject)) { |
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99 | Console.printerrln("incoming data is not of the expected type --> discarding it"); |
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100 | } |
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101 | else { |
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102 | handleJSONObject((JSONObject) value); |
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103 | } |
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104 | } |
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105 | catch (ParseException e) { |
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106 | Console.printerrln |
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107 | ("could not parse incoming data --> discarding it (" + e.toString() + ")"); |
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108 | } |
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109 | |
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110 | // this must be done to prevent firefox from notifying the "element not found" error |
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111 | response.setContentType("text/plain"); |
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112 | response.getOutputStream().write(' '); |
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113 | } |
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114 | |
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115 | /** |
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116 | * <p> |
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117 | * processes a received JSON object and validates it. If the message is ok, it is forwarded |
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118 | * to the message listener |
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119 | * </p> |
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120 | * |
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121 | * @param object the JSON object that contains a client message |
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122 | */ |
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123 | private void handleJSONObject(JSONObject object) { |
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124 | if (DO_TRACE) { |
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125 | dumpJSONObject(object, ""); |
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126 | } |
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127 | |
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128 | JSONObject message = assertValue(object, "message", JSONObject.class); |
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129 | |
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130 | if (message == null) { |
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131 | Console.printerrln("incoming data is no valid message --> discarding it"); |
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132 | } |
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133 | else { |
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134 | ClientInfos clientInfos = extractClientInfos(message); |
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135 | |
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136 | if (clientInfos == null) { |
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137 | Console.printerrln |
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138 | ("incoming message does not contain valid client infos --> discarding it"); |
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139 | } |
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140 | else { |
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141 | extractGenericEventTargets(message, clientInfos); |
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142 | GenericEvent[] events = extractGenericEvents(message, clientInfos); |
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143 | |
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144 | if (events == null) { |
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145 | Console.printerrln |
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146 | ("incoming message does not contain valid events --> discarding it"); |
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147 | } |
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148 | else { |
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149 | messageListener.handleEvents(clientInfos, events); |
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150 | Console.println |
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151 | ("handled message of " + clientInfos.getClientId() + " for app " + |
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152 | clientInfos.getAppId() + " (" + events.length + " events)"); |
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153 | } |
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154 | } |
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155 | } |
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156 | } |
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157 | |
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158 | /** |
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159 | * <p> |
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160 | * tries to extract the client infos out of the received JSON object. If this is not fully |
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161 | * possible, an appropriate message is dumped and the whole message is discarded (the method |
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162 | * return null). |
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163 | * </p> |
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164 | * |
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165 | * @param message the message to parse the client infos from |
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166 | * |
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167 | * @return the client infos, if the message is valid in this respect, or null if not |
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168 | */ |
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169 | private ClientInfos extractClientInfos(JSONObject message) { |
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170 | ClientInfos clientInfos = null; |
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171 | |
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172 | JSONObject infos = assertValue(message, "clientInfos", JSONObject.class); |
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173 | |
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174 | if (infos != null) { |
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175 | String clientId = assertValue((JSONObject) infos, "clientId", String.class); |
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176 | String appId = assertValue((JSONObject) infos, "appId", String.class); |
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177 | |
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178 | if (clientId == null) { |
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179 | Console.printerrln("client infos do not contain a valid client id"); |
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180 | } |
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181 | else if (appId == null) { |
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182 | Console.printerrln("client infos do not contain a valid application id"); |
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183 | } |
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184 | else { |
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185 | clientInfos = new ClientInfos(clientId, appId); |
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186 | } |
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187 | } |
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188 | |
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189 | return clientInfos; |
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190 | } |
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191 | |
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192 | /** |
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193 | * <p> |
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194 | * tries to extract the events out of the received JSON object. If this is not fully |
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195 | * possible, an appropriate message is dumped and the errorprone event is discarded. If no |
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196 | * valid event is found, the whole message is discarded. |
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197 | * </p> |
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198 | * |
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199 | * @param object the message to parse the events from |
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200 | * @param clientInfos the infos about the client that send the events |
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201 | * |
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202 | * @return the valid events stored in the message, or null if there are none |
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203 | */ |
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204 | private GenericEvent[] extractGenericEvents(JSONObject object, ClientInfos clientInfos) { |
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205 | List<GenericEvent> events = null; |
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206 | |
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207 | JSONArray eventArray = assertValue(object, "events", JSONArray.class); |
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208 | |
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209 | if (eventArray != null) { |
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210 | events = new ArrayList<GenericEvent>(); |
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211 | |
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212 | for (int i = 0; i < eventArray.size(); i++) { |
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213 | Object eventObj = eventArray.get(i); |
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214 | if (!(eventObj instanceof JSONObject)) { |
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215 | Console.printerrln("event number " + (i + 1) + " is not a valid event object"); |
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216 | } |
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217 | else { |
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218 | Long time = assertValue(((JSONObject) eventObj), "time", Long.class); |
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219 | String eventType = |
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220 | assertValue(((JSONObject) eventObj), "type", String.class); |
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221 | String eventTargetId = |
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222 | assertValue(((JSONObject) eventObj), "targetId", String.class); |
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223 | |
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224 | if (eventType == null) { |
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225 | Console.printerrln("event number " + (i + 1) + " has no valid event type"); |
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226 | } |
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227 | else if (eventTargetId == null) { |
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228 | Console.printerrln(eventType + " event has no valid target id"); |
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229 | } |
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230 | else if (time == null) { |
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231 | Console.printerrln(eventType + " event has no valid timestamp"); |
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232 | } |
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233 | else { |
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234 | GenericEventTarget target = eventTargets.get(eventTargetId); |
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235 | Map<String, String> parameters = getParameters |
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236 | (((JSONObject) eventObj), "time", "type", "targetId"); |
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237 | |
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238 | if (target != null) { |
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239 | events.add(new GenericEvent(clientInfos, time, target, eventType, |
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240 | parameters)); |
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241 | } |
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242 | else { |
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243 | Console.printerrln(eventType + " event has no known target"); |
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244 | } |
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245 | } |
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246 | } |
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247 | } |
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248 | |
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249 | } |
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250 | |
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251 | if ((events != null) && (events.size() > 0)) { |
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252 | return events.toArray(new GenericEvent[events.size()]); |
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253 | } |
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254 | else { |
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255 | return null; |
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256 | } |
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257 | } |
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258 | |
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259 | /** |
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260 | * <p> |
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261 | * extracts the event target structure from the provided JSON object. |
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262 | * </p> |
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263 | * |
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264 | * @param object the JSON object to extract the event target structure from |
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265 | * @param clientInfos infos about the client who send the data |
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266 | * |
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267 | * @return the event target structure extracted from the JSON object of which the root nodes |
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268 | * are provided |
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269 | */ |
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270 | private GenericEventTarget[] extractGenericEventTargets(JSONObject object, |
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271 | ClientInfos clientInfos) |
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272 | { |
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273 | JSONObject[] jsonTargets = assertValue(object, "targetStructure", JSONObject[].class); |
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274 | |
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275 | if (jsonTargets != null) { |
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276 | GenericEventTarget[] result = new GenericEventTarget[jsonTargets.length]; |
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277 | |
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278 | for (int i = 0; i < jsonTargets.length; i++) { |
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279 | result[i] = convert(jsonTargets[i], null); |
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280 | } |
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281 | |
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282 | return result; |
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283 | } |
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284 | else { |
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285 | return null; |
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286 | } |
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287 | } |
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288 | |
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289 | /** |
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290 | * <p> |
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291 | * converts a JSON object representing a target to the generic target. Calls |
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292 | * itself recursively to also convert the children of the element, if any. |
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293 | * </p> |
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294 | * |
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295 | * @param jsonTarget the JSON object to be converted |
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296 | * @param parent the parent target of the converted element, or null, if none |
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297 | * is present. |
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298 | * |
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299 | * @return as described. |
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300 | */ |
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301 | private GenericEventTarget convert(JSONObject jsonTarget, |
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302 | GenericEventTarget parent) |
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303 | { |
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304 | GenericEventTarget result = null; |
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305 | |
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306 | if (jsonTarget != null) { |
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307 | String targetId = assertValue(jsonTarget, "targetId", String.class); |
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308 | Map<String, String> parameters = getParameters(jsonTarget, "targetId", "children"); |
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309 | |
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310 | result = new GenericEventTarget(targetId, parameters, parent); |
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311 | |
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312 | JSONArray childElements = assertValue(jsonTarget, "children", JSONArray.class); |
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313 | |
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314 | if (childElements != null) { |
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315 | Object jsonChild; |
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316 | |
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317 | for (int i = 0; i < childElements.size(); i++) { |
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318 | jsonChild = childElements.get(i); |
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319 | if (!(jsonChild instanceof JSONObject)) { |
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320 | Console.printerrln("child " + (i + 1) + " of target " + targetId + |
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321 | " is no valid event target"); |
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322 | } |
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323 | else { |
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324 | result.addChild(convert((JSONObject) jsonChild, result)); |
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325 | } |
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326 | } |
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327 | } |
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328 | |
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329 | } |
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330 | |
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331 | if (result != null) { |
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332 | eventTargets.put(result.getId(), result); |
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333 | } |
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334 | |
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335 | return result; |
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336 | } |
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337 | |
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338 | /** |
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339 | * <p> |
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340 | * converts a value in the provided object matching the provided key to the provided type. If |
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341 | * there is no value with the key or if the value can not be transformed to the provided type, |
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342 | * the method returns null. |
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343 | * </p> |
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344 | * |
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345 | * @param object the object to read the value from |
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346 | * @param key the key of the value |
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347 | * @param clazz the type to which the value should be transformed |
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348 | * |
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349 | * @return the value or null if either the value does not exist or if it can not be transformed |
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350 | * to the expected type |
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351 | */ |
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352 | @SuppressWarnings("unchecked") |
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353 | private <T> T assertValue(JSONObject object, String key, Class<T> clazz) { |
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354 | Object value = object.get(key); |
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355 | T result = null; |
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356 | |
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357 | if (clazz.isInstance(value)) { |
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358 | result = (T) value; |
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359 | } |
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360 | else if (value instanceof String) { |
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361 | if (URL.class.equals(clazz)) { |
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362 | try { |
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363 | result = (T) new URL((String) value); |
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364 | } |
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365 | catch (MalformedURLException e) { |
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366 | e.printStackTrace(); |
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367 | Console.printerrln("retrieved malformed URL for key '" + key + "': " + value + |
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368 | " (" + e.toString() + ")"); |
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369 | } |
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370 | } |
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371 | else if ((int.class.equals(clazz)) || (Integer.class.equals(clazz))) { |
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372 | try { |
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373 | result = (T) Integer.valueOf(Integer.parseInt((String) value)); |
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374 | } |
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375 | catch (NumberFormatException e) { |
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376 | Console.printerrln |
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377 | ("retrieved malformed integer for key '" + key + "': " + value); |
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378 | } |
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379 | } |
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380 | else if ((long.class.equals(clazz)) || (Long.class.equals(clazz))) { |
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381 | try { |
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382 | result = (T) Long.valueOf(Long.parseLong((String) value)); |
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383 | } |
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384 | catch (NumberFormatException e) { |
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385 | Console.printerrln |
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386 | ("retrieved malformed long for key '" + key + "': " + value); |
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387 | } |
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388 | } |
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389 | } |
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390 | else if (value instanceof Long) { |
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391 | if ((int.class.equals(clazz)) || (Integer.class.equals(clazz))) { |
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392 | result = (T) (Integer) ((Long) value).intValue(); |
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393 | } |
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394 | } |
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395 | else if (value instanceof JSONArray) { |
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396 | if ((int[].class.equals(clazz)) || (Integer[].class.equals(clazz))) { |
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397 | Integer[] resultArray = new Integer[((JSONArray) value).size()]; |
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398 | boolean allCouldBeParsed = true; |
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399 | |
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400 | for (int i = 0; i < ((JSONArray) value).size(); i++) { |
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401 | try { |
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402 | if (((JSONArray) value).get(i) instanceof Long) { |
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403 | resultArray[i] = (int) (long) (Long) ((JSONArray) value).get(i); |
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404 | } |
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405 | else if (((JSONArray) value).get(i) instanceof String) { |
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406 | try { |
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407 | resultArray[i] = |
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408 | (int) Long.parseLong((String) ((JSONArray) value).get(i)); |
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409 | } |
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410 | catch (NumberFormatException e) { |
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411 | Console.printerrln |
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412 | ("retrieved malformed integer array for key '" + key + "': " + |
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413 | value); |
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414 | |
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415 | allCouldBeParsed = false; |
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416 | break; |
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417 | } |
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418 | } |
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419 | else { |
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420 | Console.printerrln |
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421 | ("can not handle type of value in expected integer array '" + key + |
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422 | "': " + value); |
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423 | } |
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424 | } |
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425 | catch (ClassCastException e) { |
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426 | e.printStackTrace(); |
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427 | Console.printerrln("expected integer array for key '" + key + |
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428 | "' but it was something else: " + value); |
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429 | |
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430 | allCouldBeParsed = false; |
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431 | break; |
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432 | } |
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433 | } |
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434 | |
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435 | if (allCouldBeParsed) { |
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436 | result = (T) resultArray; |
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437 | } |
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438 | } |
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439 | else if (JSONObject[].class.equals(clazz)) { |
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440 | JSONObject[] resultArray = new JSONObject[((JSONArray) value).size()]; |
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441 | boolean allCouldBeParsed = true; |
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442 | |
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443 | for (int i = 0; i < ((JSONArray) value).size(); i++) { |
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444 | try { |
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445 | if (((JSONArray) value).get(i) instanceof JSONObject) { |
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446 | resultArray[i] = (JSONObject) ((JSONArray) value).get(i); |
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447 | } |
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448 | } |
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449 | catch (ClassCastException e) { |
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450 | e.printStackTrace(); |
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451 | Console.printerrln("expected JSON Object array for key '" + key + |
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452 | "' but it was something else: " + value); |
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453 | |
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454 | allCouldBeParsed = false; |
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455 | break; |
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456 | } |
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457 | } |
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458 | |
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459 | if (allCouldBeParsed) { |
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460 | result = (T) resultArray; |
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461 | } |
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462 | } |
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463 | } |
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464 | |
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465 | return result; |
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466 | } |
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467 | |
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468 | /** |
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469 | * <p> |
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470 | * determines other parameters provided in the JSON object. The parameters with the provided |
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471 | * keys to ignore are not put into the resulting map. |
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472 | * </p> |
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473 | * |
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474 | * @param object the object, from which parameters shall be read |
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475 | * @param ignoredKeys the parameters not to be put into the resulting map |
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476 | * |
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477 | * @return a map with the parameters contained in the provided JSON object |
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478 | */ |
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479 | private Map<String, String> getParameters(JSONObject object, String ... ignoredKeys) { |
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480 | Map<String, String> result = new HashMap<>(); |
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481 | |
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482 | NEXT_KEY: |
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483 | for (Object key : object.keySet()) { |
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484 | if (!(key instanceof String)) { |
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485 | continue NEXT_KEY; |
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486 | } |
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487 | |
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488 | for (String ignoredKey : ignoredKeys) { |
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489 | if (ignoredKey.equals(key)) { |
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490 | continue NEXT_KEY; |
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491 | } |
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492 | } |
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493 | |
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494 | String value = assertValue(object, (String) key, String.class); |
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495 | |
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496 | result.put((String) key, value); |
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497 | } |
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498 | |
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499 | return result; |
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500 | } |
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501 | |
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502 | /** |
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503 | * <p> |
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504 | * convenience method for dumping the content of a stream and returning a new stream |
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505 | * containing the same data. |
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506 | * </p> |
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507 | * |
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508 | * @param inputStream the stream to be dumped and copied |
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509 | * @return the copy of the stream |
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510 | * |
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511 | * @throws IOException if the stream can not be read |
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512 | */ |
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513 | /* private InputStream dumpStreamContent(ServletInputStream inputStream) throws IOException { |
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514 | List<Byte> bytes = new ArrayList<Byte>(); |
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515 | int buf; |
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516 | |
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517 | while ((buf = inputStream.read()) >= 0) { |
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518 | bytes.add((byte) buf); |
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519 | } |
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520 | |
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521 | byte[] byteArray = new byte[bytes.size()]; |
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522 | for (int i = 0; i < bytes.size(); i++) { |
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523 | byteArray[i] = bytes.get(i); |
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524 | } |
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525 | |
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526 | System.out.println(new String(byteArray, "UTF-8")); |
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527 | |
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528 | return new ByteArrayInputStream(byteArray); |
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529 | }*/ |
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530 | |
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531 | /** |
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532 | * <p> |
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533 | * convenience method for dumping an object to std out. If the object is a JSON object, it is |
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534 | * deeply analyzed and its internal structure is dumped as well. |
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535 | * </p> |
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536 | * |
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537 | * @param object the object to dump |
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538 | * @param indent the indentation to be used. |
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539 | */ |
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540 | private void dumpJSONObject(Object object, String indent) { |
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541 | if (object instanceof JSONArray) { |
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542 | boolean arrayContainsJSONObjects = false; |
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543 | for (Object arrayElem : (JSONArray) object) { |
---|
544 | if (arrayElem instanceof JSONObject) { |
---|
545 | arrayContainsJSONObjects = true; |
---|
546 | break; |
---|
547 | } |
---|
548 | } |
---|
549 | |
---|
550 | if (arrayContainsJSONObjects) { |
---|
551 | System.out.println(); |
---|
552 | System.out.print(indent); |
---|
553 | System.out.println('['); |
---|
554 | System.out.print(indent); |
---|
555 | System.out.print(' '); |
---|
556 | } |
---|
557 | else { |
---|
558 | System.out.print(' '); |
---|
559 | System.out.print('['); |
---|
560 | } |
---|
561 | |
---|
562 | int index = 0; |
---|
563 | for (Object arrayElem : (JSONArray) object) { |
---|
564 | if (index++ > 0) { |
---|
565 | System.out.print(","); |
---|
566 | if (arrayContainsJSONObjects) { |
---|
567 | System.out.println(); |
---|
568 | System.out.print(indent); |
---|
569 | } |
---|
570 | |
---|
571 | System.out.print(' '); |
---|
572 | } |
---|
573 | |
---|
574 | dumpJSONObject(arrayElem, indent + " "); |
---|
575 | } |
---|
576 | |
---|
577 | if (arrayContainsJSONObjects) { |
---|
578 | System.out.println(); |
---|
579 | System.out.print(indent); |
---|
580 | } |
---|
581 | |
---|
582 | System.out.print(']'); |
---|
583 | } |
---|
584 | else if (object instanceof JSONObject) { |
---|
585 | System.out.println(" {"); |
---|
586 | |
---|
587 | @SuppressWarnings("unchecked") |
---|
588 | Set<Map.Entry<?,?>> entrySet = ((JSONObject) object).entrySet(); |
---|
589 | |
---|
590 | int index = 0; |
---|
591 | for (Map.Entry<?,?> entry : entrySet) { |
---|
592 | if (index++ > 0) { |
---|
593 | System.out.println(","); |
---|
594 | } |
---|
595 | System.out.print(indent); |
---|
596 | System.out.print(" \""); |
---|
597 | System.out.print(entry.getKey()); |
---|
598 | System.out.print("\":"); |
---|
599 | dumpJSONObject(entry.getValue(), indent + " "); |
---|
600 | } |
---|
601 | |
---|
602 | System.out.println(); |
---|
603 | System.out.print(indent); |
---|
604 | System.out.print('}'); |
---|
605 | } |
---|
606 | else { |
---|
607 | System.out.print('"'); |
---|
608 | System.out.print(object); |
---|
609 | System.out.print('"'); |
---|
610 | } |
---|
611 | } |
---|
612 | |
---|
613 | } |
---|