freenet/wot/WebOfTrustConnector.java

   1 /*
   2  * Sone - WebOfTrustConnector.java - Copyright © 2010 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.freenet.wot;
  19
  20 import java.util.HashMap;
  21 import java.util.HashSet;
  22 import java.util.Map;
  23 import java.util.Set;
  24 import java.util.logging.Level;
  25 import java.util.logging.Logger;
  26
  27 import net.pterodactylus.sone.freenet.plugin.ConnectorListener;
  28 import net.pterodactylus.sone.freenet.plugin.PluginConnector;
  29 import net.pterodactylus.sone.freenet.plugin.PluginException;
  30 import net.pterodactylus.util.logging.Logging;
  31 import freenet.support.SimpleFieldSet;
  32 import freenet.support.api.Bucket;
  33
  34 /**
  35  * Connector for the Web of Trust plugin.
  36  *
  37  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  38  */
  39 public class WebOfTrustConnector implements ConnectorListener {
  40
  41         /** The logger. */
  42         private static final Logger logger = Logging.getLogger(WebOfTrustConnector.class);
  43
  44         /** The name of the WoT plugin. */
  45         private static final String WOT_PLUGIN_NAME = "plugins.WoT.WoT";
  46
  47         /** A random connection identifier. */
  48         private static final String PLUGIN_CONNECTION_IDENTIFIER = "Sone-WoT-Connector-" + Math.abs(Math.random());
  49
  50         /** The current reply. */
  51         private Reply reply;
  52
  53         /** The plugin connector. */
  54         private final PluginConnector pluginConnector;
  55
  56         /**
  57          * Creates a new Web of Trust connector that uses the given plugin
  58          * connector.
  59          *
  60          * @param pluginConnector
  61          *            The plugin connector
  62          */
  63         public WebOfTrustConnector(PluginConnector pluginConnector) {
  64                 this.pluginConnector = pluginConnector;
  65                 pluginConnector.addConnectorListener(WOT_PLUGIN_NAME, PLUGIN_CONNECTION_IDENTIFIER, this);
  66         }
  67
  68         //
  69         // ACTIONS
  70         //
  71
  72         /**
  73          * Loads all own identities from the Web of Trust plugin.
  74          *
  75          * @return All own identity
  76          * @throws WebOfTrustException
  77          *             if the own identities can not be loaded
  78          */
  79         public Set<OwnIdentity> loadAllOwnIdentities() throws WebOfTrustException {
  80                 Reply reply = performRequest(SimpleFieldSetConstructor.create().put("Message", "GetOwnIdentities").get());
  81                 SimpleFieldSet fields = reply.getFields();
  82                 int ownIdentityCounter = -1;
  83                 Set<OwnIdentity> ownIdentities = new HashSet<OwnIdentity>();
  84                 while (true) {
  85                         String id = fields.get("Identity" + ++ownIdentityCounter);
  86                         if (id == null) {
  87                                 break;
  88                         }
  89                         String requestUri = fields.get("RequestURI" + ownIdentityCounter);
  90                         String insertUri = fields.get("InsertURI" + ownIdentityCounter);
  91                         String nickname = fields.get("Nickname" + ownIdentityCounter);
  92                         DefaultOwnIdentity ownIdentity = new DefaultOwnIdentity(this, id, nickname, requestUri, insertUri);
  93                         ownIdentity.setContextsPrivate(parseContexts("Contexts" + ownIdentityCounter + ".", fields));
  94                         ownIdentity.setPropertiesPrivate(parseProperties("Properties" + ownIdentityCounter + ".", fields));
  95                         ownIdentities.add(ownIdentity);
  96                 }
  97                 return ownIdentities;
  98         }
  99
 100         /**
 101          * Loads all identities that the given identities trusts with a score of
 102          * more than 0.
 103          *
 104          * @param ownIdentity
 105          *            The own identity
 106          * @return All trusted identities
 107          * @throws PluginException
 108          *             if an error occured talking to the Web of Trust plugin
 109          */
 110         public Set<Identity> loadTrustedIdentities(OwnIdentity ownIdentity) throws PluginException {
 111                 return loadTrustedIdentities(ownIdentity, null);
 112         }
 113
 114         /**
 115          * Loads all identities that the given identities trusts with a score of
 116          * more than 0 and the (optional) given context.
 117          *
 118          * @param ownIdentity
 119          *            The own identity
 120          * @param context
 121          *            The context to filter, or {@code null}
 122          * @return All trusted identities
 123          * @throws PluginException
 124          *             if an error occured talking to the Web of Trust plugin
 125          */
 126         public Set<Identity> loadTrustedIdentities(OwnIdentity ownIdentity, String context) throws PluginException {
 127                 Reply reply = performRequest(SimpleFieldSetConstructor.create().put("Message", "GetIdentitiesByScore").put("TreeOwner", ownIdentity.getId()).put("Selection", "+").put("Context", (context == null) ? "" : context).get());
 128                 SimpleFieldSet fields = reply.getFields();
 129                 Set<Identity> identities = new HashSet<Identity>();
 130                 int identityCounter = -1;
 131                 while (true) {
 132                         String id = fields.get("Identity" + ++identityCounter);
 133                         if (id == null) {
 134                                 break;
 135                         }
 136                         String nickname = fields.get("Nickname" + identityCounter);
 137                         String requestUri = fields.get("RequestURI" + identityCounter);
 138                         DefaultIdentity identity = new DefaultIdentity(this, id, nickname, requestUri);
 139                         identity.setContextsPrivate(parseContexts("Contexts" + identityCounter + ".", fields));
 140                         identity.setPropertiesPrivate(parseProperties("Properties" + identityCounter + ".", fields));
 141                         identities.add(identity);
 142                 }
 143                 return identities;
 144         }
 145
 146         /**
 147          * Adds the given context to the given identity.
 148          *
 149          * @param ownIdentity
 150          *            The identity to add the context to
 151          * @param context
 152          *            The context to add
 153          * @throws PluginException
 154          *             if an error occured talking to the Web of Trust plugin
 155          */
 156         public void addContext(OwnIdentity ownIdentity, String context) throws PluginException {
 157                 performRequest(SimpleFieldSetConstructor.create().put("Message", "AddContext").put("Identity", ownIdentity.getId()).put("Context", context).get());
 158         }
 159
 160         /**
 161          * Removes the given context from the given identity.
 162          *
 163          * @param ownIdentity
 164          *            The identity to remove the context from
 165          * @param context
 166          *            The context to remove
 167          * @throws PluginException
 168          *             if an error occured talking to the Web of Trust plugin
 169          */
 170         public void removeContext(OwnIdentity ownIdentity, String context) throws PluginException {
 171                 performRequest(SimpleFieldSetConstructor.create().put("Message", "RemoveContext").put("Identity", ownIdentity.getId()).put("Context", context).get());
 172         }
 173
 174         /**
 175          * Returns the value of the property with the given name.
 176          *
 177          * @param identity
 178          *            The identity whose properties to check
 179          * @param name
 180          *            The name of the property to return
 181          * @return The value of the property, or {@code null} if there is no value
 182          * @throws PluginException
 183          *             if an error occured talking to the Web of Trust plugin
 184          */
 185         public String getProperty(Identity identity, String name) throws PluginException {
 186                 Reply reply = performRequest(SimpleFieldSetConstructor.create().put("Message", "GetProperty").put("Identity", identity.getId()).put("Property", name).get());
 187                 return reply.getFields().get("Property");
 188         }
 189
 190         /**
 191          * Sets the property with the given name to the given value.
 192          *
 193          * @param ownIdentity
 194          *            The identity to set the property on
 195          * @param name
 196          *            The name of the property to set
 197          * @param value
 198          *            The value to set
 199          * @throws PluginException
 200          *             if an error occured talking to the Web of Trust plugin
 201          */
 202         public void setProperty(OwnIdentity ownIdentity, String name, String value) throws PluginException {
 203                 performRequest(SimpleFieldSetConstructor.create().put("Message", "SetProperty").put("Identity", ownIdentity.getId()).put("Property", name).put("Value", value).get());
 204         }
 205
 206         /**
 207          * Removes the property with the given name.
 208          *
 209          * @param ownIdentity
 210          *            The identity to remove the property from
 211          * @param name
 212          *            The name of the property to remove
 213          * @throws PluginException
 214          *             if an error occured talking to the Web of Trust plugin
 215          */
 216         public void removeProperty(OwnIdentity ownIdentity, String name) throws PluginException {
 217                 performRequest(SimpleFieldSetConstructor.create().put("Message", "RemoveProperty").put("Identity", ownIdentity.getId()).put("Property", name).get());
 218         }
 219
 220         /**
 221          * Returns the trust for the given identity assigned to it by the given own
 222          * identity.
 223          *
 224          * @param ownIdentity
 225          *            The own identity
 226          * @param identity
 227          *            The identity to get the trust for
 228          * @return The trust for the given identity
 229          * @throws PluginException
 230          *             if an error occured talking to the Web of Trust plugin
 231          */
 232         public Trust getTrust(OwnIdentity ownIdentity, Identity identity) throws PluginException {
 233                 Reply getTrustReply = performRequest(SimpleFieldSetConstructor.create().put("Message", "GetIdentity").put("TreeOwner", ownIdentity.getId()).put("Identity", identity.getId()).get());
 234                 String trust = getTrustReply.getFields().get("Trust");
 235                 String score = getTrustReply.getFields().get("Score");
 236                 String rank = getTrustReply.getFields().get("Rank");
 237                 Integer explicit = null;
 238                 Integer implicit = null;
 239                 Integer distance = null;
 240                 try {
 241                         explicit = Integer.valueOf(trust);
 242                 } catch (NumberFormatException nfe1) {
 243                         /* ignore. */
 244                 }
 245                 try {
 246                         implicit = Integer.valueOf(score);
 247                         distance = Integer.valueOf(rank);
 248                 } catch (NumberFormatException nfe1) {
 249                         /* ignore. */
 250                 }
 251                 return new Trust(explicit, implicit, distance);
 252         }
 253
 254         /**
 255          * Sets the trust for the given identity.
 256          *
 257          * @param ownIdentity
 258          *            The trusting identity
 259          * @param identity
 260          *            The trusted identity
 261          * @param trust
 262          *            The amount of trust (-100 thru 100)
 263          * @param comment
 264          *            The comment or explanation of the trust value
 265          * @throws PluginException
 266          *             if an error occured talking to the Web of Trust plugin
 267          */
 268         public void setTrust(OwnIdentity ownIdentity, Identity identity, int trust, String comment) throws PluginException {
 269                 performRequest(SimpleFieldSetConstructor.create().put("Message", "SetTrust").put("Truster", ownIdentity.getId()).put("Trustee", identity.getId()).put("Value", String.valueOf(trust)).put("Comment", comment).get());
 270         }
 271
 272         /**
 273          * Removes any trust assignment of the given own identity for the given
 274          * identity.
 275          *
 276          * @param ownIdentity
 277          *            The own identity
 278          * @param identity
 279          *            The identity to remove all trust for
 280          * @throws WebOfTrustException
 281          *             if an error occurs
 282          */
 283         public void removeTrust(OwnIdentity ownIdentity, Identity identity) throws WebOfTrustException {
 284                 performRequest(SimpleFieldSetConstructor.create().put("Message", "RemoveTrust").put("Truster", ownIdentity.getId()).put("Trustee", identity.getId()).get());
 285         }
 286
 287         /**
 288          * Pings the Web of Trust plugin. If the plugin can not be reached, a
 289          * {@link PluginException} is thrown.
 290          *
 291          * @throws PluginException
 292          *             if the plugin is not loaded
 293          */
 294         public void ping() throws PluginException {
 295                 performRequest(SimpleFieldSetConstructor.create().put("Message", "Ping").get());
 296         }
 297
 298         //
 299         // PRIVATE ACTIONS
 300         //
 301
 302         /**
 303          * Parses the contexts from the given fields.
 304          *
 305          * @param prefix
 306          *            The prefix to use to access the contexts
 307          * @param fields
 308          *            The fields to parse the contexts from
 309          * @return The parsed contexts
 310          */
 311         private Set<String> parseContexts(String prefix, SimpleFieldSet fields) {
 312                 Set<String> contexts = new HashSet<String>();
 313                 int contextCounter = -1;
 314                 while (true) {
 315                         String context = fields.get(prefix + "Context" + ++contextCounter);
 316                         if (context == null) {
 317                                 break;
 318                         }
 319                         contexts.add(context);
 320                 }
 321                 return contexts;
 322         }
 323
 324         /**
 325          * Parses the properties from the given fields.
 326          *
 327          * @param prefix
 328          *            The prefix to use to access the properties
 329          * @param fields
 330          *            The fields to parse the properties from
 331          * @return The parsed properties
 332          */
 333         private Map<String, String> parseProperties(String prefix, SimpleFieldSet fields) {
 334                 Map<String, String> properties = new HashMap<String, String>();
 335                 int propertiesCounter = -1;
 336                 while (true) {
 337                         String propertyName = fields.get(prefix + "Property" + ++propertiesCounter + ".Name");
 338                         if (propertyName == null) {
 339                                 break;
 340                         }
 341                         String propertyValue = fields.get(prefix + "Property" + propertiesCounter + ".Value");
 342                         properties.put(propertyName, propertyValue);
 343                 }
 344                 return properties;
 345         }
 346
 347         /**
 348          * Sends a request containing the given fields and waits for the target
 349          * message.
 350          *
 351          * @param fields
 352          *            The fields of the message
 353          * @return The reply message
 354          * @throws PluginException
 355          *             if the request could not be sent
 356          */
 357         private Reply performRequest(SimpleFieldSet fields) throws PluginException {
 358                 return performRequest(fields, null);
 359         }
 360
 361         /**
 362          * Sends a request containing the given fields and waits for the target
 363          * message.
 364          *
 365          * @param fields
 366          *            The fields of the message
 367          * @param data
 368          *            The payload of the message
 369          * @return The reply message
 370          * @throws PluginException
 371          *             if the request could not be sent
 372          */
 373         private synchronized Reply performRequest(SimpleFieldSet fields, Bucket data) throws PluginException {
 374                 reply = new Reply();
 375                 logger.log(Level.FINE, "Sending FCP Request: " + fields.get("Message"));
 376                 synchronized (reply) {
 377                         pluginConnector.sendRequest(WOT_PLUGIN_NAME, PLUGIN_CONNECTION_IDENTIFIER, fields, data);
 378                         try {
 379                                 reply.wait();
 380                         } catch (InterruptedException ie1) {
 381                                 logger.log(Level.WARNING, "Got interrupted while waiting for reply on " + fields.get("Message") + ".", ie1);
 382                         }
 383                 }
 384                 logger.log(Level.FINEST, "Received FCP Response for %s: %s", new Object[] { fields.get("Message"), (reply.getFields() != null) ? reply.getFields().get("Message") : null });
 385                 if ((reply.getFields() == null) || "Error".equals(reply.getFields().get("Message"))) {
 386                         throw new PluginException("Could not perform request for " + fields.get("Message"));
 387                 }
 388                 return reply;
 389         }
 390
 391         //
 392         // INTERFACE ConnectorListener
 393         //
 394
 395         /**
 396          * {@inheritDoc}
 397          */
 398         @Override
 399         public void receivedReply(PluginConnector pluginConnector, SimpleFieldSet fields, Bucket data) {
 400                 String messageName = fields.get("Message");
 401                 logger.log(Level.FINEST, "Received Reply from Plugin: " + messageName);
 402                 synchronized (reply) {
 403                         reply.setFields(fields);
 404                         reply.setData(data);
 405                         reply.notify();
 406                 }
 407         }
 408
 409         /**
 410          * Container for the data of the reply from a plugin.
 411          *
 412          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 413          */
 414         private static class Reply {
 415
 416                 /** The fields of the reply. */
 417                 private SimpleFieldSet fields;
 418
 419                 /** The payload of the reply. */
 420                 private Bucket data;
 421
 422                 /** Empty constructor. */
 423                 public Reply() {
 424                         /* do nothing. */
 425                 }
 426
 427                 /**
 428                  * Returns the fields of the reply.
 429                  *
 430                  * @return The fields of the reply
 431                  */
 432                 public SimpleFieldSet getFields() {
 433                         return fields;
 434                 }
 435
 436                 /**
 437                  * Sets the fields of the reply.
 438                  *
 439                  * @param fields
 440                  *            The fields of the reply
 441                  */
 442                 public void setFields(SimpleFieldSet fields) {
 443                         this.fields = fields;
 444                 }
 445
 446                 /**
 447                  * Returns the payload of the reply.
 448                  *
 449                  * @return The payload of the reply (may be {@code null})
 450                  */
 451                 @SuppressWarnings("unused")
 452                 public Bucket getData() {
 453                         return data;
 454                 }
 455
 456                 /**
 457                  * Sets the payload of the reply.
 458                  *
 459                  * @param data
 460                  *            The payload of the reply (may be {@code null})
 461                  */
 462                 public void setData(Bucket data) {
 463                         this.data = data;
 464                 }
 465
 466         }
 467
 468         /**
 469          * Helper method to create {@link SimpleFieldSet}s with terser code.
 470          *
 471          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 472          */
 473         private static class SimpleFieldSetConstructor {
 474
 475                 /** The field set being created. */
 476                 private SimpleFieldSet simpleFieldSet;
 477
 478                 /**
 479                  * Creates a new simple field set constructor.
 480                  *
 481                  * @param shortLived
 482                  *            {@code true} if the resulting simple field set should be
 483                  *            short-lived, {@code false} otherwise
 484                  */
 485                 private SimpleFieldSetConstructor(boolean shortLived) {
 486                         simpleFieldSet = new SimpleFieldSet(shortLived);
 487                 }
 488
 489                 //
 490                 // ACCESSORS
 491                 //
 492
 493                 /**
 494                  * Returns the created simple field set.
 495                  *
 496                  * @return The created simple field set
 497                  */
 498                 public SimpleFieldSet get() {
 499                         return simpleFieldSet;
 500                 }
 501
 502                 /**
 503                  * Sets the field with the given name to the given value.
 504                  *
 505                  * @param name
 506                  *            The name of the fleld
 507                  * @param value
 508                  *            The value of the field
 509                  * @return This constructor (for method chaining)
 510                  */
 511                 public SimpleFieldSetConstructor put(String name, String value) {
 512                         simpleFieldSet.putOverwrite(name, value);
 513                         return this;
 514                 }
 515
 516                 //
 517                 // ACTIONS
 518                 //
 519
 520                 /**
 521                  * Creates a new simple field set constructor.
 522                  *
 523                  * @return The created simple field set constructor
 524                  */
 525                 public static SimpleFieldSetConstructor create() {
 526                         return create(true);
 527                 }
 528
 529                 /**
 530                  * Creates a new simple field set constructor.
 531                  *
 532                  * @param shortLived
 533                  *            {@code true} if the resulting simple field set should be
 534                  *            short-lived, {@code false} otherwise
 535                  * @return The created simple field set constructor
 536                  */
 537                 public static SimpleFieldSetConstructor create(boolean shortLived) {
 538                         SimpleFieldSetConstructor simpleFieldSetConstructor = new SimpleFieldSetConstructor(shortLived);
 539                         return simpleFieldSetConstructor;
 540                 }
 541
 542         }
 543
 544 }