1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui;
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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.text.MessageFormat;
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7 |
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8 | import org.openstreetmap.josm.Main;
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9 | import org.openstreetmap.josm.data.Preferences.PreferenceChangeEvent;
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10 | import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
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11 | import org.openstreetmap.josm.data.Preferences.StringSetting;
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12 | import org.openstreetmap.josm.data.osm.UserInfo;
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13 | import org.openstreetmap.josm.io.auth.CredentialsManager;
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14 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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15 |
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16 | /**
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17 | * JosmUserStateManager is a global object which keeps track of what JOSM knows about
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18 | * the identity of the current user.
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19 | *
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20 | * JOSM can be operated anonymously provided the current user never invokes an operation
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21 | * on the OSM server which required authentication. In this case JOSM neither knows
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22 | * the user name of the OSM account of the current user nor its unique id. Perhaps the
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23 | * user doesn't have one.
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24 | *
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25 | * If the current user supplies a user name and a password in the JOSM preferences JOSM
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26 | * can partially identify the user.
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27 | *
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28 | * The current user is fully identified if JOSM knows both the user name and the unique
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29 | * id of the users OSM account. The latter is retrieved from the OSM server with a
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30 | * <tt>GET /api/0.6/user/details</tt> request, submitted with the user name and password
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31 | * of the current user.
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32 | *
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33 | * The global JosmUserStateManager listens to {@see PreferenceChangeEvent}s and keeps track
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34 | * of what the current JOSM instance knows about the current user. Other subsystems can
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35 | * let the global JosmUserStateManager know in case they fully identify the current user, see
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36 | * {@see #setFullyIdentified(String, long)}.
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37 | *
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38 | * The information kept by the JosmUserStateManager can be used to
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39 | * <ul>
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40 | * <li>safely query changesets owned by the current user based on its user id, not on its user name</li>
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41 | * <li>safely search for objects last touched by the current user based on its user id, not on its user name</li>
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42 | * </ul>
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43 | *
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44 | */
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45 | public class JosmUserIdentityManager implements PreferenceChangedListener{
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46 |
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47 | static private JosmUserIdentityManager instance;
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48 |
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49 | /**
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50 | * Replies the unique instance of the JOSM user identity manager
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51 | *
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52 | * @return the unique instance of the JOSM user identity manager
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53 | */
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54 | static public JosmUserIdentityManager getInstance() {
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55 | if (instance == null) {
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56 | instance = new JosmUserIdentityManager();
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57 | instance.initFromPreferences();
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58 | Main.pref.addPreferenceChangeListener(instance);
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59 | }
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60 | return instance;
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61 | }
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62 |
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63 | private String userName;
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64 | private UserInfo userInfo;
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65 |
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66 | private JosmUserIdentityManager() {
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67 | }
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68 |
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69 | /**
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70 | * Remembers the fact that the current JOSM user is anonymous.
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71 | */
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72 | public void setAnonymous() {
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73 | userName = null;
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74 | userInfo = null;
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75 | }
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76 |
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77 | /**
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78 | * Remebers the fact that the current JOSM user is partially identified
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79 | * by the user name of its OSM account.
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80 | *
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81 | * @param userName the user name. Must not be null. Must not be empty (whitespace only).
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82 | * @throws IllegalArgumentException thrown if userName is null
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83 | * @throws IllegalArgumentException thrown if userName is empty
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84 | */
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85 | public void setPartiallyIdentified(String userName) throws IllegalArgumentException {
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86 | CheckParameterUtil.ensureParameterNotNull(userName, "userName");
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87 | if (userName.trim().equals(""))
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88 | throw new IllegalArgumentException(MessageFormat.format("Expected non-empty value for parameter ''{0}'', got ''{1}''", "userName", userName));
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89 | this.userName = userName;
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90 | userInfo = null;
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91 | }
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92 |
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93 | /**
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94 | * Remembers the fact that the current JOSM user is fully identified with a
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95 | * verified pair of user name and user id.
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96 | *
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97 | * @param userName the user name. Must not be null. Must not be empty.
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98 | * @param userinfo additional information about the user, retrieved from the OSM server and including the user id
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99 | * @throws IllegalArgumentException thrown if userName is null
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100 | * @throws IllegalArgumentException thrown if userName is empty
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101 | * @throws IllegalArgumentException thrown if userinfo is null
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102 | */
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103 | public void setFullyIdentified(String username, UserInfo userinfo) throws IllegalArgumentException {
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104 | CheckParameterUtil.ensureParameterNotNull(username, "username");
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105 | if (username.trim().equals(""))
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106 | throw new IllegalArgumentException(tr("Expected non-empty value for parameter ''{0}'', got ''{1}''", "userName", userName));
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107 | CheckParameterUtil.ensureParameterNotNull(userinfo, "userinfo");
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108 | this.userName = username;
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109 | this.userInfo = userinfo;
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110 | }
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111 |
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112 | /**
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113 | * Replies true if the current JOSM user is anonymous.
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114 | *
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115 | * @return true if the current user is anonymous.
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116 | */
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117 | public boolean isAnonymous() {
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118 | return userName == null && userInfo == null;
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119 | }
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120 |
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121 | /**
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122 | * Replies true if the current JOSM user is partially identified.
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123 | *
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124 | * @return true if the current JOSM user is partially identified.
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125 | */
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126 | public boolean isPartiallyIdentified() {
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127 | return userName != null && userInfo == null;
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128 | }
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129 |
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130 | /**
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131 | * Replies true if the current JOSM user is fully identified.
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132 | *
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133 | * @return true if the current JOSM user is fully identified.
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134 | */
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135 | public boolean isFullyIdentified() {
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136 | return userName != null && userInfo != null;
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137 | }
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138 |
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139 | /**
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140 | * Replies the user name of the current JOSM user. null, if {@see #isAnonymous()} is true.
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141 | *
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142 | * @return the user name of the current JOSM user
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143 | */
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144 | public String getUserName() {
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145 | return userName;
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146 | }
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147 |
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148 | /**
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149 | * Replies the user id of the current JOSM user. 0, if {@see #isAnonymous()} or
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150 | * {@see #isPartiallyIdentified()} is true.
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151 | *
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152 | * @return the user id of the current JOSM user
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153 | */
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154 | public int getUserId() {
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155 | if (userInfo == null) return 0;
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156 | return userInfo.getId();
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157 | }
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158 |
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159 | /**
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160 | * Replies verified additional information about the current user if the user is
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161 | * {@see #isFullyIdentified()}.
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162 | *
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163 | * @return verified additional information about the current user
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164 | */
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165 | public UserInfo getUserInfo() {
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166 | return userInfo;
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167 | }
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168 | /**
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169 | * Initializes the user identity manager from values in the {@see org.openstreetmap.josm.data.Preferences}
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170 | */
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171 | public void initFromPreferences() {
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172 | String userName = CredentialsManager.getInstance().getUsername();
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173 | if (isAnonymous()) {
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174 | if (userName != null && ! userName.trim().equals("")) {
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175 | setPartiallyIdentified(userName);
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176 | }
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177 | } else {
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178 | if (!userName.equals(this.userName)) {
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179 | setPartiallyIdentified(userName);
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180 | } else {
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181 | // same name in the preferences as JOSM already knows about;
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182 | // keep the state, be it partially or fully identified
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183 | }
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184 | }
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185 | }
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186 |
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187 | /**
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188 | * Replies true if the user with name <code>username</code> is the current
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189 | * user
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190 | *
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191 | * @param username the user name
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192 | * @return true if the user with name <code>username</code> is the current
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193 | * user
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194 | */
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195 | public boolean isCurrentUser(String username) {
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196 | if (username == null || this.userName == null) return false;
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197 | return this.userName.equals(username);
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198 | }
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199 |
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200 | /* ------------------------------------------------------------------- */
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201 | /* interface PreferenceChangeListener */
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202 | /* ------------------------------------------------------------------- */
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203 | public void preferenceChanged(PreferenceChangeEvent evt) {
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204 | if (evt.getKey().equals("osm-server.username")) {
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205 | if (!(evt.getNewValue() instanceof StringSetting)) return;
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206 | String newValue = ((StringSetting) evt.getNewValue()).getValue();
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207 | if (newValue == null || newValue.trim().length() == 0) {
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208 | setAnonymous();
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209 | } else {
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210 | if (! newValue.equals(userName)) {
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211 | setPartiallyIdentified(newValue);
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212 | }
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213 | }
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214 | return;
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215 | }
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216 |
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217 | if (evt.getKey().equals("osm-server.url")) {
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218 | if (!(evt.getNewValue() instanceof StringSetting)) return;
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219 | String newValue = ((StringSetting) evt.getNewValue()).getValue();
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220 | if (newValue == null || newValue.trim().equals("")) {
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221 | setAnonymous();
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222 | } else if (isFullyIdentified()) {
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223 | setPartiallyIdentified(getUserName());
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224 | }
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225 | }
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226 | }
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227 | }
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