src/net/pterodactylus/fcp/plugin/WebOfTrustPlugin.java

   1 /*
   2  * jFCPlib - WebOfTrustPlugin.java -
   3  * Copyright © 2009 David Roden
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 package net.pterodactylus.fcp.plugin;
  21
  22 import java.io.IOException;
  23 import java.util.HashMap;
  24 import java.util.HashSet;
  25 import java.util.Map;
  26 import java.util.Set;
  27
  28 import net.pterodactylus.fcp.highlevel.FcpClient;
  29 import net.pterodactylus.fcp.highlevel.FcpException;
  30
  31 /**
  32  * Simplifies handling of the web-of-trust plugin.
  33  *
  34  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  35  */
  36 public class WebOfTrustPlugin {
  37
  38         /** The FCP client to use. */
  39         private final FcpClient fcpClient;
  40
  41         /**
  42          * Creates a new web-of-trust plugin wrapper around the given FCP client.
  43          *
  44          * @param fcpClient
  45          *            The FCP client to use for communication with the web-of-trust
  46          *            plugin
  47          */
  48         public WebOfTrustPlugin(FcpClient fcpClient) {
  49                 this.fcpClient = fcpClient;
  50         }
  51
  52         /**
  53          * Creates a new identity.
  54          *
  55          * @param nickname
  56          *            The nickname of the new identity
  57          * @param context
  58          *            The context for the new identity
  59          * @param publishTrustList
  60          *            {@code true} if the new identity should publish its trust list
  61          * @return The new identity
  62          * @throws IOException
  63          *             if an I/O error occurs
  64          * @throws FcpException
  65          *             if an FCP error occurs
  66          */
  67         public OwnIdentity createIdentity(String nickname, String context, boolean publishTrustList) throws IOException, FcpException {
  68                 return createIdentity(nickname, context, publishTrustList, null, null);
  69         }
  70
  71         /**
  72          * Creates a new identity from the given request and insert URI.
  73          *
  74          * @param nickname
  75          *            The nickname of the new identity
  76          * @param context
  77          *            The context for the new identity
  78          * @param publishTrustList
  79          *            {@code true} if the new identity should publish its trust list
  80          * @param requestUri
  81          *            The request URI of the identity
  82          * @param insertUri
  83          *            The insert URI of the identity
  84          * @return The new identity
  85          * @throws IOException
  86          *             if an I/O error occurs
  87          * @throws FcpException
  88          *             if an FCP error occurs
  89          */
  90         public OwnIdentity createIdentity(String nickname, String context, boolean publishTrustList, String requestUri, String insertUri) throws IOException, FcpException {
  91                 Map<String, String> parameters = new HashMap<String, String>();
  92                 parameters.put("Message", "CreateIdentity");
  93                 parameters.put("Nickname", nickname);
  94                 parameters.put("Context", context);
  95                 parameters.put("PublishTrustList", String.valueOf(publishTrustList));
  96                 if ((requestUri != null) && (insertUri != null)) {
  97                         parameters.put("RequestURI", requestUri);
  98                         parameters.put("InsertURI", insertUri);
  99                 }
 100                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", parameters);
 101                 if (!replies.get("Message").equals("IdentityCreated")) {
 102                         throw new FcpException("WebOfTrust Plugin did not reply with “IdentityCreated” message!");
 103                 }
 104                 String identifier = replies.get("ID");
 105                 String newRequestUri = replies.get("RequestURI");
 106                 String newInsertUri = replies.get("InsertURI");
 107                 return new OwnIdentity(identifier, nickname, newRequestUri, newInsertUri);
 108         }
 109
 110         /**
 111          * Returns all own identities of the web-of-trust plugins. Almost all other
 112          * commands require an {@link OwnIdentity} to return meaningful values.
 113          *
 114          * @return All own identities of the web-of-trust plugin
 115          * @throws IOException
 116          *             if an I/O error occurs
 117          * @throws FcpException
 118          *             if an FCP error occurs
 119          */
 120         public Set<OwnIdentity> getOwnIdentites() throws IOException, FcpException {
 121                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "GetOwnIdentities"));
 122                 if (!replies.get("Message").equals("OwnIdentities")) {
 123                         throw new FcpException("WebOfTrust Plugin did not reply with “OwnIdentities” message!");
 124                 }
 125                 Set<OwnIdentity> ownIdentities = new HashSet<OwnIdentity>();
 126                 for (int identityIndex = 1; replies.containsKey("Identity" + identityIndex); identityIndex++) {
 127                         String identity = replies.get("Identity" + identityIndex);
 128                         String nickname = replies.get("Nickname" + identityIndex);
 129                         String requestUri = replies.get("RequestURI" + identityIndex);
 130                         String insertUri = replies.get("InsertURI" + identityIndex);
 131                         ownIdentities.add(new OwnIdentity(identity, nickname, requestUri, insertUri));
 132                 }
 133                 return ownIdentities;
 134         }
 135
 136         /**
 137          * Returns the trust given to the identity with the given identifier by the
 138          * given own identity.
 139          *
 140          * @param ownIdentity
 141          *            The own identity that is used to calculate trust values
 142          * @param identifier
 143          *            The identifier of the identity whose trust to get
 144          * @return The request identity trust
 145          * @throws IOException
 146          *             if an I/O error occurs
 147          * @throws FcpException
 148          *             if an FCP error occurs
 149          */
 150         public CalculatedTrust getIdentityTrust(OwnIdentity ownIdentity, String identifier) throws IOException, FcpException {
 151                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "GetIdentity", "TreeOwner", ownIdentity.getIdentifier(), "Identity", identifier));
 152                 if (!replies.get("Message").equals("Identity")) {
 153                         throw new FcpException("WebOfTrust Plugin did not reply with “Identity” message!");
 154                 }
 155                 Byte trust = null;
 156                 try {
 157                         trust = Byte.valueOf(replies.get("Trust"));
 158                 } catch (NumberFormatException nfe1) {
 159                         /* ignore. */
 160                 }
 161                 Integer score = null;
 162                 try {
 163                         score = Integer.valueOf(replies.get("Score"));
 164                 } catch (NumberFormatException nfe1) {
 165                         /* ignore. */
 166                 }
 167                 Integer rank = null;
 168                 try {
 169                         rank = Integer.valueOf(replies.get("Rank"));
 170                 } catch (NumberFormatException nfe1) {
 171                         /* ignore. */
 172                 }
 173                 return new CalculatedTrust(trust, score, rank);
 174         }
 175
 176         /**
 177          * Adds a new identity by its request URI.
 178          *
 179          * @param requestUri
 180          *            The request URI of the identity to add
 181          * @return The added identity
 182          * @throws IOException
 183          *             if an I/O error occurs
 184          * @throws FcpException
 185          *             if an FCP error occurs
 186          */
 187         public Identity addIdentity(String requestUri) throws IOException, FcpException {
 188                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "AddIdentity", "RequestURI", requestUri));
 189                 if (!replies.get("Message").equals("IdentityAdded")) {
 190                         throw new FcpException("WebOfTrust Plugin did not reply with “IdentityAdded” message!");
 191                 }
 192                 String identifier = replies.get("ID");
 193                 String nickname = replies.get("Nickname");
 194                 return new Identity(identifier, nickname, requestUri);
 195         }
 196
 197         /**
 198          * Returns identities by the given score.
 199          *
 200          * @param ownIdentity
 201          *            The own identity
 202          * @param context
 203          *            The context to get the identities for
 204          * @param positive
 205          *            {@code null} to return neutrally trusted identities, {@code
 206          *            true} to return positively trusted identities, {@code false}
 207          *            for negatively trusted identities
 208          * @return The trusted identites
 209          * @throws IOException
 210          *             if an I/O error occurs
 211          * @throws FcpException
 212          *             if an FCP error occurs
 213          */
 214         public Set<Identity> getIdentitesByScore(OwnIdentity ownIdentity, String context, Boolean positive) throws IOException, FcpException {
 215                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "GetIdentitesByScore", "TreeOwner", ownIdentity.getIdentifier(), "Context", context, "Selection", ((positive == null) ? "0" : (positive ? "+" : "-"))));
 216                 if (!replies.get("Message").equals("Identities")) {
 217                         throw new FcpException("WebOfTrust Plugin did not reply with “Identities” message!");
 218                 }
 219                 Set<Identity> identities = new HashSet<Identity>();
 220                 for (int identityIndex = 1; replies.containsKey("Identity" + identityIndex); identityIndex++) {
 221                         String identifier = replies.get("Identity" + identityIndex);
 222                         String nickname = replies.get("Nickname" + identityIndex);
 223                         String requestUri = replies.get("RequestURI" + identityIndex);
 224                         identities.add(new Identity(identifier, nickname, requestUri));
 225                 }
 226                 return identities;
 227         }
 228
 229         /**
 230          * Returns the identities that trust the given identity.
 231          *
 232          * @param identity
 233          *            The identity to get the trusters for
 234          * @param context
 235          *            The context to get the trusters for
 236          * @return The identities and their trust values
 237          * @throws IOException
 238          *             if an I/O error occurs
 239          * @throws FcpException
 240          *             if an FCP error occurs
 241          */
 242         public Map<Identity, IdentityTrust> getTrusters(Identity identity, String context) throws IOException, FcpException {
 243                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "GetTrusters", "Identity", identity.getIdentifier(), "Context", context));
 244                 if (!replies.get("Message").equals("Identities")) {
 245                         throw new FcpException("WebOfTrust Plugin did not reply with “Identities” message!");
 246                 }
 247                 Map<Identity, IdentityTrust> identityTrusts = new HashMap<Identity, IdentityTrust>();
 248                 for (int identityIndex = 1; replies.containsKey("Identity" + identityIndex); identityIndex++) {
 249                         String identifier = replies.get("Identity" + identityIndex);
 250                         String nickname = replies.get("Nickname" + identityIndex);
 251                         String requestUri = replies.get("RequestURI" + identityIndex);
 252                         byte trust = Byte.parseByte(replies.get("Value" + identityIndex));
 253                         String comment = replies.get("Comment" + identityIndex);
 254                         identityTrusts.put(new Identity(identifier, nickname, requestUri), new IdentityTrust(trust, comment));
 255                 }
 256                 return identityTrusts;
 257         }
 258
 259         /**
 260          * Sets the trust given to the given identify by the given own identity.
 261          *
 262          * @param ownIdentity
 263          *            The identity that gives the trust
 264          * @param identity
 265          *            The identity that receives the trust
 266          * @param trust
 267          *            The trust value (ranging from {@code -100} to {@code 100}
 268          * @param comment
 269          *            The comment for setting the trust
 270          * @throws IOException
 271          *             if an I/O error occurs
 272          * @throws FcpException
 273          *             if an FCP error occurs
 274          */
 275         public void setTrust(OwnIdentity ownIdentity, Identity identity, byte trust, String comment) throws IOException, FcpException {
 276                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "SetTrust", "Truster", ownIdentity.getIdentifier(), "Trustee", identity.getIdentifier(), "Value", String.valueOf(trust), "Comment", comment));
 277                 if (!replies.get("Message").equals("TrustSet")) {
 278                         throw new FcpException("WebOfTrust Plugin did not reply with “TrustSet” message!");
 279                 }
 280         }
 281
 282         //
 283         // PRIVATE METHODS
 284         //
 285
 286         /**
 287          * Creates a map from each pair of parameters in the given array.
 288          *
 289          * @param parameters
 290          *            The array of parameters
 291          * @return The map created from the array
 292          * @throws ArrayIndexOutOfBoundsException
 293          *             if the given parameter array does not contains an even number
 294          *             of elements
 295          */
 296         private Map<String, String> createParameters(String... parameters) throws ArrayIndexOutOfBoundsException {
 297                 Map<String, String> parameterMap = new HashMap<String, String>();
 298                 for (int index = 0; index < parameters.length; index += 2) {
 299                         parameterMap.put(parameters[index], parameters[index + 1]);
 300                 }
 301                 return parameterMap;
 302         }
 303
 304         /**
 305          * Wrapper around a web-of-trust identity.
 306          *
 307          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 308          */
 309         public static class Identity {
 310
 311                 /** The identity’s identifier. */
 312                 private final String identifier;
 313
 314                 /** The identity’s nickname. */
 315                 private final String nickname;
 316
 317                 /** The identity’s request URI. */
 318                 private final String requestUri;
 319
 320                 /**
 321                  * Creates a new identity.
 322                  *
 323                  * @param identifier
 324                  *            The identifies of the identity
 325                  * @param nickname
 326                  *            The nickname of the identity
 327                  * @param requestUri
 328                  *            The request URI of the identity
 329                  */
 330                 public Identity(String identifier, String nickname, String requestUri) {
 331                         this.identifier = identifier;
 332                         this.nickname = nickname;
 333                         this.requestUri = requestUri;
 334                 }
 335
 336                 /**
 337                  * Returns the identifier of this identity.
 338                  *
 339                  * @return This identity’s identifier
 340                  */
 341                 public String getIdentifier() {
 342                         return identifier;
 343                 }
 344
 345                 /**
 346                  * Returns the nickname of this identity.
 347                  *
 348                  * @return This identity’s nickname
 349                  */
 350                 public String getNickname() {
 351                         return nickname;
 352                 }
 353
 354                 /**
 355                  * Returns the request URI of this identity.
 356                  *
 357                  * @return This identity’s request URI
 358                  */
 359                 public String getRequestUri() {
 360                         return requestUri;
 361                 }
 362
 363         }
 364
 365         /**
 366          * Container for the trust given from one identity to another.
 367          *
 368          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 369          */
 370         public static class IdentityTrust {
 371
 372                 /** The trust given to the identity. */
 373                 private final byte trust;
 374
 375                 /** The command for the trust value. */
 376                 private final String comment;
 377
 378                 /**
 379                  * Creates a new identity trust container.
 380                  *
 381                  * @param trust
 382                  *            The trust given to the identity
 383                  * @param comment
 384                  *            The comment for the trust value
 385                  */
 386                 public IdentityTrust(byte trust, String comment) {
 387                         this.trust = trust;
 388                         this.comment = comment;
 389                 }
 390
 391                 /**
 392                  * Returns the trust value given to the identity.
 393                  *
 394                  * @return The trust value
 395                  */
 396                 public byte getTrust() {
 397                         return trust;
 398                 }
 399
 400                 /**
 401                  * Returns the comment for the trust value.
 402                  *
 403                  * @return The comment for the trust value
 404                  */
 405                 public String getComment() {
 406                         return comment;
 407                 }
 408
 409         }
 410
 411         /**
 412          * Container that stores the trust that is calculated by taking all trustees
 413          * and their trust lists into account.
 414          *
 415          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 416          */
 417         public static class CalculatedTrust {
 418
 419                 /** The calculated trust value. */
 420                 private final Byte trust;
 421
 422                 /** The calculated score value. */
 423                 private final Integer score;
 424
 425                 /** The calculated rank. */
 426                 private final Integer rank;
 427
 428                 /**
 429                  * Creates a new calculated trust container.
 430                  *
 431                  * @param trust
 432                  *            The calculated trust value
 433                  * @param score
 434                  *            The calculated score value
 435                  * @param rank
 436                  *            The calculated rank of the
 437                  */
 438                 public CalculatedTrust(Byte trust, Integer score, Integer rank) {
 439                         this.trust = trust;
 440                         this.score = score;
 441                         this.rank = rank;
 442                 }
 443
 444                 /**
 445                  * Returns the calculated trust value.
 446                  *
 447                  * @return The calculated trust value, or {@code null} if the trust
 448                  *         value is not known
 449                  */
 450                 public Byte getTrust() {
 451                         return trust;
 452                 }
 453
 454                 /**
 455                  * Returns the calculated score value.
 456                  *
 457                  * @return The calculated score value, or {@code null} if the score
 458                  *         value is not known
 459                  */
 460                 public Integer getScore() {
 461                         return score;
 462                 }
 463
 464                 /**
 465                  * Returns the calculated rank.
 466                  *
 467                  * @return The calculated rank, or {@code null} if the rank is not known
 468                  */
 469                 public Integer getRank() {
 470                         return rank;
 471                 }
 472
 473         }
 474
 475         /**
 476          * Wrapper around a web-of-trust own identity.
 477          *
 478          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 479          */
 480         public static class OwnIdentity extends Identity {
 481
 482                 /** The identity’s insert URI. */
 483                 private final String insertUri;
 484
 485                 /**
 486                  * Creates a new web-of-trust own identity.
 487                  *
 488                  * @param identifier
 489                  *            The identifier of the identity
 490                  * @param nickname
 491                  *            The nickname of the identity
 492                  * @param requestUri
 493                  *            The request URI of the identity
 494                  * @param insertUri
 495                  *            The insert URI of the identity
 496                  */
 497                 public OwnIdentity(String identifier, String nickname, String requestUri, String insertUri) {
 498                         super(identifier, nickname, requestUri);
 499                         this.insertUri = insertUri;
 500                 }
 501
 502                 /**
 503                  * Returns the insert URI of this identity.
 504                  *
 505                  * @return This identity’s insert URI
 506                  */
 507                 public String getInsertUri() {
 508                         return insertUri;
 509                 }
 510
 511         }
 512
 513 }