1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io.remotecontrol.handler;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.UnsupportedEncodingException;
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7 | import java.net.URLDecoder;
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8 | import java.text.MessageFormat;
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9 | import java.util.HashMap;
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10 | import java.util.LinkedList;
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11 | import java.util.List;
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12 |
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13 | import javax.swing.JLabel;
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14 | import javax.swing.JOptionPane;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 | import org.openstreetmap.josm.io.remotecontrol.PermissionPrefWithDefault;
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18 | import org.openstreetmap.josm.tools.Utils;
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19 |
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20 | /**
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21 | * This is the parent of all classes that handle a specific remote control command
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22 | *
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23 | * @author Bodo Meissner
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24 | */
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25 | public abstract class RequestHandler {
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26 |
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27 | public static final String globalConfirmationKey = "remotecontrol.always-confirm";
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28 | public static final boolean globalConfirmationDefault = false;
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29 | public static final String loadInNewLayerKey = "remotecontrol.new-layer";
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30 | public static final boolean loadInNewLayerDefault = false;
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31 |
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32 | /** The GET request arguments */
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33 | protected HashMap<String,String> args;
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34 |
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35 | /** The request URL without "GET". */
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36 | protected String request;
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37 |
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38 | /** default response */
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39 | protected String content = "OK\r\n";
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40 | /** default content type */
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41 | protected String contentType = "text/plain";
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42 |
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43 | /** will be filled with the command assigned to the subclass */
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44 | protected String myCommand;
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45 |
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46 | /**
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47 | * Check permission and parameters and handle request.
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48 | *
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49 | * @throws RequestHandlerForbiddenException
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50 | * @throws RequestHandlerBadRequestException
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51 | * @throws RequestHandlerErrorException
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52 | */
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53 | public final void handle() throws RequestHandlerForbiddenException, RequestHandlerBadRequestException, RequestHandlerErrorException
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54 | {
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55 | checkMandatoryParams();
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56 | validateRequest();
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57 | checkPermission();
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58 | handleRequest();
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59 | }
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60 |
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61 | /**
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62 | * Validates the request before attempting to perform it.
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63 | * @throws RequestHandlerBadRequestException
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64 | * @since 5678
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65 | */
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66 | protected abstract void validateRequest() throws RequestHandlerBadRequestException;
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67 |
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68 | /**
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69 | * Handle a specific command sent as remote control.
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70 | *
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71 | * This method of the subclass will do the real work.
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72 | *
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73 | * @throws RequestHandlerErrorException
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74 | * @throws RequestHandlerBadRequestException
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75 | */
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76 | protected abstract void handleRequest() throws RequestHandlerErrorException, RequestHandlerBadRequestException;
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77 |
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78 | /**
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79 | * Get a specific message to ask the user for permission for the operation
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80 | * requested via remote control.
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81 | *
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82 | * This message will be displayed to the user if the preference
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83 | * remotecontrol.always-confirm is true.
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84 | *
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85 | * @return the message
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86 | */
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87 | abstract public String getPermissionMessage();
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88 |
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89 | /**
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90 | * Get a PermissionPref object containing the name of a special permission
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91 | * preference to individually allow the requested operation and an error
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92 | * message to be displayed when a disabled operation is requested.
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93 | *
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94 | * Default is not to check any special preference. Override this in a
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95 | * subclass to define permission preference and error message.
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96 | *
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97 | * @return the preference name and error message or null
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98 | */
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99 | abstract public PermissionPrefWithDefault getPermissionPref();
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100 |
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101 | abstract public String[] getMandatoryParams();
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102 |
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103 | /**
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104 | * Check permissions in preferences and display error message
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105 | * or ask for permission.
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106 | *
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107 | * @throws RequestHandlerForbiddenException
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108 | */
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109 | final public void checkPermission() throws RequestHandlerForbiddenException
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110 | {
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111 | /*
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112 | * If the subclass defines a specific preference and if this is set
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113 | * to false, abort with an error message.
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114 | *
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115 | * Note: we use the deprecated class here for compatibility with
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116 | * older versions of WMSPlugin.
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117 | */
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118 | PermissionPrefWithDefault permissionPref = getPermissionPref();
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119 | if((permissionPref != null) && (permissionPref.pref != null))
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120 | {
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121 | if (!Main.pref.getBoolean(permissionPref.pref, permissionPref.defaultVal)) {
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122 | String err = MessageFormat.format("RemoteControl: ''{0}'' forbidden by preferences", myCommand);
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123 | System.out.println(err);
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124 | throw new RequestHandlerForbiddenException(err);
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125 | }
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126 | }
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127 |
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128 | /* Does the user want to confirm everything?
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129 | * If yes, display specific confirmation message.
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130 | */
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131 | if (Main.pref.getBoolean(globalConfirmationKey, globalConfirmationDefault)) {
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132 | // Ensure dialog box does not exceed main window size
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133 | Integer maxWidth = (int) Math.max(200, Main.parent.getWidth()*0.6);
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134 | String message = "<html><div>" + getPermissionMessage() +
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135 | "<br/>" + tr("Do you want to allow this?") + "</div></html>";
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136 | JLabel label = new JLabel(message);
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137 | if (label.getPreferredSize().width > maxWidth) {
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138 | label.setText(message.replaceFirst("<div>", "<div style=\"width:" + maxWidth + "px;\">"));
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139 | }
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140 | if (JOptionPane.showConfirmDialog(Main.parent, label,
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141 | tr("Confirm Remote Control action"),
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142 | JOptionPane.YES_NO_OPTION) != JOptionPane.YES_OPTION) {
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143 | String err = MessageFormat.format("RemoteControl: ''{0}'' forbidden by user''s choice", myCommand);
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144 | throw new RequestHandlerForbiddenException(err);
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145 | }
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146 | }
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147 | }
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148 |
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149 | /**
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150 | * Set request URL and parse args.
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151 | *
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152 | * @param url The request URL.
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153 | */
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154 | public void setUrl(String url) {
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155 | this.request = url;
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156 | parseArgs();
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157 | }
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158 |
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159 | /**
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160 | * Parse the request parameters as key=value pairs.
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161 | * The result will be stored in {@code this.args}.
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162 | *
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163 | * Can be overridden by subclass.
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164 | */
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165 | protected void parseArgs() {
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166 | try {
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167 | String req = URLDecoder.decode(this.request, "UTF-8");
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168 | HashMap<String, String> args = new HashMap<String, String>();
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169 | if (req.indexOf('?') != -1) {
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170 | String query = req.substring(req.indexOf('?') + 1);
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171 | if (query.indexOf('#') != -1) {
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172 | query = query.substring(0, query.indexOf('#'));
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173 | }
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174 | String[] params = query.split("&", -1);
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175 | for (String param : params) {
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176 | int eq = param.indexOf('=');
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177 | if (eq != -1) {
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178 | args.put(param.substring(0, eq), param.substring(eq + 1));
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179 | }
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180 | }
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181 | }
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182 | this.args = args;
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183 | } catch (UnsupportedEncodingException ex) {
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184 | throw new IllegalStateException(ex);
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185 | }
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186 | }
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187 |
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188 | void checkMandatoryParams() throws RequestHandlerBadRequestException {
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189 | String[] mandatory = getMandatoryParams();
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190 | if(mandatory == null) return;
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191 |
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192 | List<String> missingKeys = new LinkedList<String>();
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193 | boolean error = false;
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194 | for (String key : mandatory) {
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195 | String value = args.get(key);
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196 | if ((value == null) || (value.length() == 0)) {
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197 | error = true;
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198 | System.out.println("'" + myCommand + "' remote control request must have '" + key + "' parameter");
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199 | missingKeys.add(key);
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200 | }
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201 | }
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202 | if (error) {
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203 | throw new RequestHandlerBadRequestException(
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204 | "The following keys are mandatory, but have not been provided: "
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205 | + Utils.join(", ", missingKeys));
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206 | }
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207 | }
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208 |
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209 | /**
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210 | * Save command associated with this handler.
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211 | *
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212 | * @param command The command.
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213 | */
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214 | public void setCommand(String command)
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215 | {
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216 | if (command.charAt(0) == '/') {
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217 | command = command.substring(1);
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218 | }
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219 | myCommand = command;
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220 | }
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221 |
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222 | public String getContent() {
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223 | return content;
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224 | }
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225 |
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226 | public String getContentType() {
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227 | return contentType;
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228 | }
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229 |
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230 | protected boolean isLoadInNewLayer() {
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231 | return args.get("new_layer") != null && !args.get("new_layer").isEmpty()
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232 | ? Boolean.parseBoolean(args.get("new_layer"))
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233 | : Main.pref.getBoolean(loadInNewLayerKey, loadInNewLayerDefault);
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234 | }
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235 |
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236 | protected final String decodeParam(String param) {
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237 | try {
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238 | return URLDecoder.decode(param, "UTF-8");
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239 | } catch (UnsupportedEncodingException e) {
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240 | throw new RuntimeException();
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241 | }
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242 | }
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243 |
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244 | public static class RequestHandlerException extends Exception {
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245 |
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246 | public RequestHandlerException(String message) {
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247 | super(message);
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248 | }
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249 |
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250 | public RequestHandlerException() {
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251 | }
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252 | }
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253 |
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254 | public static class RequestHandlerErrorException extends RequestHandlerException {
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255 | }
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256 |
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257 | public static class RequestHandlerBadRequestException extends RequestHandlerException {
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258 |
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259 | public RequestHandlerBadRequestException(String message) {
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260 | super(message);
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261 | }
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262 | }
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263 |
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264 | public static class RequestHandlerForbiddenException extends RequestHandlerException {
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265 | private static final long serialVersionUID = 2263904699747115423L;
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266 |
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267 | public RequestHandlerForbiddenException(String message) {
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268 | super(message);
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269 | }
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270 | }
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271 | }
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