1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io.remotecontrol;
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3 |
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4 | import java.io.BufferedOutputStream;
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5 | import java.io.BufferedReader;
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6 | import java.io.IOException;
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7 | import java.io.InputStreamReader;
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8 | import java.io.OutputStream;
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9 | import java.io.OutputStreamWriter;
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10 | import java.io.PrintWriter;
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11 | import java.io.StringWriter;
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12 | import java.io.Writer;
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13 | import java.net.Socket;
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14 | import java.nio.charset.StandardCharsets;
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15 | import java.util.Arrays;
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16 | import java.util.Date;
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17 | import java.util.HashMap;
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18 | import java.util.Map;
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19 | import java.util.Map.Entry;
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20 | import java.util.StringTokenizer;
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21 | import java.util.TreeMap;
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22 | import java.util.regex.Matcher;
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23 | import java.util.regex.Pattern;
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24 |
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25 | import org.openstreetmap.josm.Main;
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26 | import org.openstreetmap.josm.gui.help.HelpUtil;
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27 | import org.openstreetmap.josm.io.remotecontrol.handler.AddNodeHandler;
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28 | import org.openstreetmap.josm.io.remotecontrol.handler.AddWayHandler;
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29 | import org.openstreetmap.josm.io.remotecontrol.handler.FeaturesHandler;
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30 | import org.openstreetmap.josm.io.remotecontrol.handler.ImageryHandler;
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31 | import org.openstreetmap.josm.io.remotecontrol.handler.ImportHandler;
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32 | import org.openstreetmap.josm.io.remotecontrol.handler.LoadAndZoomHandler;
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33 | import org.openstreetmap.josm.io.remotecontrol.handler.LoadDataHandler;
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34 | import org.openstreetmap.josm.io.remotecontrol.handler.LoadObjectHandler;
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35 | import org.openstreetmap.josm.io.remotecontrol.handler.OpenFileHandler;
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36 | import org.openstreetmap.josm.io.remotecontrol.handler.RequestHandler;
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37 | import org.openstreetmap.josm.io.remotecontrol.handler.RequestHandler.RequestHandlerBadRequestException;
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38 | import org.openstreetmap.josm.io.remotecontrol.handler.RequestHandler.RequestHandlerErrorException;
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39 | import org.openstreetmap.josm.io.remotecontrol.handler.RequestHandler.RequestHandlerForbiddenException;
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40 | import org.openstreetmap.josm.io.remotecontrol.handler.VersionHandler;
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41 | import org.openstreetmap.josm.tools.Utils;
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42 |
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43 | /**
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44 | * Processes HTTP "remote control" requests.
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45 | */
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46 | public class RequestProcessor extends Thread {
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47 | /**
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48 | * RemoteControl protocol version. Change minor number for compatible
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49 | * interface extensions. Change major number in case of incompatible
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50 | * changes.
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51 | */
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52 | public static final String PROTOCOLVERSION = "{\"protocolversion\": {\"major\": " +
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53 | RemoteControl.protocolMajorVersion + ", \"minor\": " +
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54 | RemoteControl.protocolMinorVersion +
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55 | "}, \"application\": \"JOSM RemoteControl\"}";
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56 |
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57 | /** The socket this processor listens on */
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58 | private Socket request;
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59 |
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60 | /**
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61 | * Collection of request handlers.
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62 | * Will be initialized with default handlers here. Other plug-ins
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63 | * can extend this list by using @see addRequestHandler
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64 | */
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65 | private static Map<String, Class<? extends RequestHandler>> handlers = new TreeMap<>();
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66 |
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67 | /**
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68 | * Constructor
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69 | *
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70 | * @param request A socket to read the request.
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71 | */
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72 | public RequestProcessor(Socket request) {
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73 | super("RemoteControl request processor");
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74 | this.setDaemon(true);
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75 | this.request = request;
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76 | }
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77 |
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78 | /**
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79 | * Spawns a new thread for the request
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80 | * @param request The request to process
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81 | */
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82 | public static void processRequest(Socket request) {
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83 | RequestProcessor processor = new RequestProcessor(request);
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84 | processor.start();
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85 | }
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86 |
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87 | /**
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88 | * Add external request handler. Can be used by other plug-ins that
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89 | * want to use remote control.
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90 | *
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91 | * @param command The command to handle.
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92 | * @param handler The additional request handler.
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93 | */
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94 | public static void addRequestHandlerClass(String command, Class<? extends RequestHandler> handler) {
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95 | addRequestHandlerClass(command, handler, false);
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96 | }
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97 |
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98 | /**
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99 | * Add external request handler. Message can be suppressed.
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100 | * (for internal use)
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101 | *
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102 | * @param command The command to handle.
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103 | * @param handler The additional request handler.
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104 | * @param silent Don't show message if true.
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105 | */
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106 | private static void addRequestHandlerClass(String command,
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107 | Class<? extends RequestHandler> handler, boolean silent) {
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108 | if (command.charAt(0) == '/') {
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109 | command = command.substring(1);
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110 | }
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111 | String commandWithSlash = '/' + command;
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112 | if (handlers.get(commandWithSlash) != null) {
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113 | Main.info("RemoteControl: ignoring duplicate command " + command
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114 | + " with handler " + handler.getName());
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115 | } else {
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116 | if (!silent) {
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117 | Main.info("RemoteControl: adding command \"" +
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118 | command + "\" (handled by " + handler.getSimpleName() + ')');
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119 | }
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120 | handlers.put(commandWithSlash, handler);
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121 | }
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122 | }
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123 |
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124 | /** Add default request handlers */
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125 | static {
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126 | addRequestHandlerClass(LoadAndZoomHandler.command, LoadAndZoomHandler.class, true);
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127 | addRequestHandlerClass(LoadAndZoomHandler.command2, LoadAndZoomHandler.class, true);
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128 | addRequestHandlerClass(LoadDataHandler.command, LoadDataHandler.class, true);
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129 | addRequestHandlerClass(ImageryHandler.command, ImageryHandler.class, true);
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130 | addRequestHandlerClass(AddNodeHandler.command, AddNodeHandler.class, true);
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131 | addRequestHandlerClass(AddWayHandler.command, AddWayHandler.class, true);
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132 | addRequestHandlerClass(ImportHandler.command, ImportHandler.class, true);
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133 | addRequestHandlerClass(VersionHandler.command, VersionHandler.class, true);
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134 | addRequestHandlerClass(LoadObjectHandler.command, LoadObjectHandler.class, true);
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135 | addRequestHandlerClass(OpenFileHandler.command, OpenFileHandler.class, true);
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136 | addRequestHandlerClass(FeaturesHandler.command, FeaturesHandler.class, true);
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137 | }
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138 |
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139 | /**
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140 | * The work is done here.
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141 | */
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142 | @Override
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143 | public void run() {
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144 | Writer out = null;
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145 | try {
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146 | OutputStream raw = new BufferedOutputStream(request.getOutputStream());
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147 | out = new OutputStreamWriter(raw, StandardCharsets.UTF_8);
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148 | BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream(), "ASCII"));
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149 |
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150 | String get = in.readLine();
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151 | if (get == null) {
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152 | sendError(out);
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153 | return;
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154 | }
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155 | Main.info("RemoteControl received: " + get);
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156 |
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157 | StringTokenizer st = new StringTokenizer(get);
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158 | if (!st.hasMoreTokens()) {
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159 | sendError(out);
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160 | return;
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161 | }
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162 | String method = st.nextToken();
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163 | if (!st.hasMoreTokens()) {
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164 | sendError(out);
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165 | return;
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166 | }
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167 | String url = st.nextToken();
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168 |
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169 | if (!"GET".equals(method)) {
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170 | sendNotImplemented(out);
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171 | return;
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172 | }
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173 |
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174 | int questionPos = url.indexOf('?');
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175 |
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176 | String command = questionPos < 0 ? url : url.substring(0, questionPos);
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177 |
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178 | Map<String, String> headers = new HashMap<>();
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179 | int k = 0, MAX_HEADERS = 20;
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180 | while (k < MAX_HEADERS) {
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181 | get = in.readLine();
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182 | if (get == null) break;
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183 | k++;
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184 | String[] h = get.split(": ", 2);
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185 | if (h.length == 2) {
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186 | headers.put(h[0], h[1]);
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187 | } else break;
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188 | }
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189 |
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190 | // Who sent the request: trying our best to detect
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191 | // not from localhost => sender = IP
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192 | // from localhost: sender = referer header, if exists
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193 | String sender = null;
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194 |
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195 | if (!request.getInetAddress().isLoopbackAddress()) {
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196 | sender = request.getInetAddress().getHostAddress();
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197 | } else {
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198 | String ref = headers.get("Referer");
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199 | Pattern r = Pattern.compile("(https?://)?([^/]*)");
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200 | if (ref != null) {
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201 | Matcher m = r.matcher(ref);
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202 | if (m.find()) {
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203 | sender = m.group(2);
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204 | }
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205 | }
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206 | if (sender == null) {
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207 | sender = "localhost";
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208 | }
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209 | }
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210 |
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211 | // find a handler for this command
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212 | Class<? extends RequestHandler> handlerClass = handlers.get(command);
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213 | if (handlerClass == null) {
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214 | String usage = getUsageAsHtml();
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215 | String websiteDoc = HelpUtil.getWikiBaseHelpUrl() +"/Help/Preferences/RemoteControl";
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216 | String help = "No command specified! The following commands are available:<ul>" + usage
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217 | + "</ul>" + "See <a href=\""+websiteDoc+"\">"+websiteDoc+"</a> for complete documentation.";
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218 | sendBadRequest(out, help);
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219 | } else {
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220 | // create handler object
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221 | RequestHandler handler = handlerClass.newInstance();
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222 | try {
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223 | handler.setCommand(command);
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224 | handler.setUrl(url);
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225 | handler.setSender(sender);
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226 | handler.handle();
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227 | sendHeader(out, "200 OK", handler.getContentType(), false);
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228 | out.write("Content-length: " + handler.getContent().length()
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229 | + "\r\n");
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230 | out.write("\r\n");
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231 | out.write(handler.getContent());
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232 | out.flush();
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233 | } catch (RequestHandlerErrorException ex) {
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234 | sendError(out);
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235 | } catch (RequestHandlerBadRequestException ex) {
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236 | sendBadRequest(out, ex.getMessage());
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237 | } catch (RequestHandlerForbiddenException ex) {
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238 | sendForbidden(out, ex.getMessage());
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239 | }
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240 | }
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241 |
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242 | } catch (IOException ioe) {
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243 | Main.debug(Main.getErrorMessage(ioe));
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244 | } catch (Exception e) {
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245 | Main.error(e);
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246 | try {
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247 | sendError(out);
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248 | } catch (IOException e1) {
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249 | Main.warn(e1);
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250 | }
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251 | } finally {
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252 | try {
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253 | request.close();
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254 | } catch (IOException e) {
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255 | Main.debug(Main.getErrorMessage(e));
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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 | /**
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261 | * Sends a 500 error: server error
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262 | *
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263 | * @param out
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264 | * The writer where the error is written
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265 | * @throws IOException
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266 | * If the error can not be written
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267 | */
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268 | private void sendError(Writer out) throws IOException {
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269 | sendHeader(out, "500 Internal Server Error", "text/html", true);
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270 | out.write("<HTML>\r\n");
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271 | out.write("<HEAD><TITLE>Internal Error</TITLE>\r\n");
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272 | out.write("</HEAD>\r\n");
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273 | out.write("<BODY>");
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274 | out.write("<H1>HTTP Error 500: Internal Server Error</H1>\r\n");
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275 | out.write("</BODY></HTML>\r\n");
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276 | out.flush();
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277 | }
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278 |
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279 | /**
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280 | * Sends a 501 error: not implemented
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281 | *
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282 | * @param out
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283 | * The writer where the error is written
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284 | * @throws IOException
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285 | * If the error can not be written
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286 | */
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287 | private void sendNotImplemented(Writer out) throws IOException {
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288 | sendHeader(out, "501 Not Implemented", "text/html", true);
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289 | out.write("<HTML>\r\n");
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290 | out.write("<HEAD><TITLE>Not Implemented</TITLE>\r\n");
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291 | out.write("</HEAD>\r\n");
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292 | out.write("<BODY>");
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293 | out.write("<H1>HTTP Error 501: Not Implemented</h2>\r\n");
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294 | out.write("</BODY></HTML>\r\n");
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295 | out.flush();
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296 | }
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297 |
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298 | /**
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299 | * Sends a 403 error: forbidden
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300 | *
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301 | * @param out
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302 | * The writer where the error is written
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303 | * @throws IOException
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304 | * If the error can not be written
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305 | */
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306 | private void sendForbidden(Writer out, String help) throws IOException {
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307 | sendHeader(out, "403 Forbidden", "text/html", true);
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308 | out.write("<HTML>\r\n");
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309 | out.write("<HEAD><TITLE>Forbidden</TITLE>\r\n");
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310 | out.write("</HEAD>\r\n");
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311 | out.write("<BODY>");
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312 | out.write("<H1>HTTP Error 403: Forbidden</h2>\r\n");
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313 | if (help != null) {
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314 | out.write(help);
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315 | }
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316 | out.write("</BODY></HTML>\r\n");
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317 | out.flush();
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318 | }
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319 |
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320 | /**
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321 | * Sends a 403 error: forbidden
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322 | *
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323 | * @param out
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324 | * The writer where the error is written
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325 | * @throws IOException
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326 | * If the error can not be written
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327 | */
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328 | private void sendBadRequest(Writer out, String help) throws IOException {
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329 | sendHeader(out, "400 Bad Request", "text/html", true);
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330 | out.write("<HTML>\r\n");
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331 | out.write("<HEAD><TITLE>Bad Request</TITLE>\r\n");
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332 | out.write("</HEAD>\r\n");
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333 | out.write("<BODY>");
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334 | out.write("<H1>HTTP Error 400: Bad Request</h2>\r\n");
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335 | if (help != null) {
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336 | out.write(help);
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337 | }
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338 | out.write("</BODY></HTML>\r\n");
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339 | out.flush();
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340 | }
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341 |
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342 | /**
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343 | * Send common HTTP headers to the client.
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344 | *
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345 | * @param out
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346 | * The Writer
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347 | * @param status
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348 | * The status string ("200 OK", "500", etc)
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349 | * @param contentType
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350 | * The content type of the data sent
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351 | * @param endHeaders
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352 | * If true, adds a new line, ending the headers.
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353 | * @throws IOException
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354 | * When error
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355 | */
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356 | private void sendHeader(Writer out, String status, String contentType,
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357 | boolean endHeaders) throws IOException {
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358 | out.write("HTTP/1.1 " + status + "\r\n");
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359 | Date now = new Date();
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360 | out.write("Date: " + now + "\r\n");
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361 | out.write("Server: JOSM RemoteControl\r\n");
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362 | out.write("Content-type: " + contentType + "\r\n");
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363 | out.write("Access-Control-Allow-Origin: *\r\n");
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364 | if (endHeaders)
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365 | out.write("\r\n");
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366 | }
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367 |
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368 | public static String getHandlersInfoAsJSON() {
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369 | StringBuilder r = new StringBuilder();
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370 | boolean first = true;
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371 | r.append('[');
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372 |
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373 | for (Entry<String, Class<? extends RequestHandler>> p : handlers.entrySet()) {
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374 | if (first) {
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375 | first = false;
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376 | } else {
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377 | r.append(", ");
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378 | }
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379 | r.append(getHandlerInfoAsJSON(p.getKey()));
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380 | }
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381 | r.append(']');
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382 |
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383 | return r.toString();
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384 | }
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385 |
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386 | public static String getHandlerInfoAsJSON(String cmd) {
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387 | try (StringWriter w = new StringWriter()) {
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388 | PrintWriter r = new PrintWriter(w);
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389 | RequestHandler handler = null;
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390 | try {
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391 | Class<?> c = handlers.get(cmd);
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392 | if (c == null) return null;
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393 | handler = handlers.get(cmd).newInstance();
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394 | } catch (InstantiationException | IllegalAccessException ex) {
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395 | Main.error(ex);
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396 | return null;
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397 | }
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398 |
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399 | printJsonInfo(cmd, r, handler);
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400 | return w.toString();
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401 | } catch (IOException e) {
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402 | Main.error(e);
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403 | return null;
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404 | }
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405 | }
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406 |
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407 | private static void printJsonInfo(String cmd, PrintWriter r, RequestHandler handler) {
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408 | r.printf("{ \"request\" : \"%s\"", cmd);
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409 | if (handler.getUsage() != null) {
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410 | r.printf(", \"usage\" : \"%s\"", handler.getUsage());
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411 | }
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412 | r.append(", \"parameters\" : [");
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413 |
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414 | String[] params = handler.getMandatoryParams();
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415 | if (params != null) {
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416 | for (int i = 0; i < params.length; i++) {
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417 | if (i == 0) {
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418 | r.append('\"');
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419 | } else {
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420 | r.append(", \"");
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421 | }
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422 | r.append(params[i]).append('\"');
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423 | }
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424 | }
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425 | r.append("], \"optional\" : [");
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426 | String[] optional = handler.getOptionalParams();
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427 | if (optional != null) {
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428 | for (int i = 0; i < optional.length; i++) {
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429 | if (i == 0) {
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430 | r.append('\"');
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431 | } else {
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432 | r.append(", \"");
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433 | }
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434 | r.append(optional[i]).append('\"');
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435 | }
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436 | }
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437 |
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438 | r.append("], \"examples\" : [");
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439 | String[] examples = handler.getUsageExamples(cmd.substring(1));
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440 | if (examples != null) {
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441 | for (int i = 0; i < examples.length; i++) {
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442 | if (i == 0) {
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443 | r.append('\"');
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444 | } else {
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445 | r.append(", \"");
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446 | }
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447 | r.append(examples[i]).append('\"');
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448 | }
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449 | }
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450 | r.append("]}");
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451 | }
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452 |
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453 | /**
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454 | * Reports HTML message with the description of all available commands
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455 | * @return HTML message with the description of all available commands
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456 | * @throws IllegalAccessException if one handler class or its nullary constructor is not accessible.
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457 | * @throws InstantiationException if one handler class represents an abstract class, an interface, an array class,
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458 | * a primitive type, or void; or if the class has no nullary constructor; or if the instantiation fails for some other reason.
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459 | */
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460 | public static String getUsageAsHtml() throws IllegalAccessException, InstantiationException {
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461 | StringBuilder usage = new StringBuilder(1024);
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462 | for (Entry<String, Class<? extends RequestHandler>> handler : handlers.entrySet()) {
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463 | RequestHandler sample = handler.getValue().newInstance();
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464 | String[] mandatory = sample.getMandatoryParams();
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465 | String[] optional = sample.getOptionalParams();
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466 | String[] examples = sample.getUsageExamples(handler.getKey().substring(1));
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467 | usage.append("<li>")
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468 | .append(handler.getKey());
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469 | if (sample.getUsage() != null && !sample.getUsage().isEmpty()) {
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470 | usage.append(" — <i>").append(sample.getUsage()).append("</i>");
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471 | }
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472 | if (mandatory != null) {
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473 | usage.append("<br/>mandatory parameters: ").append(Utils.join(", ", Arrays.asList(mandatory)));
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474 | }
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475 | if (optional != null) {
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476 | usage.append("<br/>optional parameters: ").append(Utils.join(", ", Arrays.asList(optional)));
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477 | }
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478 | if (examples != null) {
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479 | usage.append("<br/>examples: ");
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480 | for (String ex: examples) {
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481 | usage.append("<br/> <a href=\"http://localhost:8111").append(ex).append("\">").append(ex).append("</a>");
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482 | }
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483 | }
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484 | usage.append("</li>");
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485 | }
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486 | return usage.toString();
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487 | }
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488 | }
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