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          * Sets the trust given to the given identify by the given own identity.
 231          *
 232          * @param ownIdentity
 233          *            The identity that gives the trust
 234          * @param identity
 235          *            The identity that receives the trust
 236          * @param trust
 237          *            The trust value (ranging from {@code -100} to {@code 100}
 238          * @param comment
 239          *            The comment for setting the trust
 240          * @throws IOException
 241          *             if an I/O error occurs
 242          * @throws FcpException
 243          *             if an FCP error occurs
 244          */
 245         public void setTrust(OwnIdentity ownIdentity, Identity identity, byte trust, String comment) throws IOException, FcpException {
 246                 Map<String, String> replies = fcpClient.sendPluginMessage("plugins.WoT.WoT", createParameters("Message", "SetTrust", "Truster", ownIdentity.getIdentifier(), "Trustee", identity.getIdentifier(), "Value", String.valueOf(trust), "Comment", comment));
 247                 if (!replies.get("Message").equals("TrustSet")) {
 248                         throw new FcpException("WebOfTrust Plugin did not reply with “TrustSet” message!");
 249                 }
 250         }
 251
 252         //
 253         // PRIVATE METHODS
 254         //
 255
 256         /**
 257          * Creates a map from each pair of parameters in the given array.
 258          *
 259          * @param parameters
 260          *            The array of parameters
 261          * @return The map created from the array
 262          * @throws ArrayIndexOutOfBoundsException
 263          *             if the given parameter array does not contains an even number
 264          *             of elements
 265          */
 266         private Map<String, String> createParameters(String... parameters) throws ArrayIndexOutOfBoundsException {
 267                 Map<String, String> parameterMap = new HashMap<String, String>();
 268                 for (int index = 0; index < parameters.length; index += 2) {
 269                         parameterMap.put(parameters[index], parameters[index + 1]);
 270                 }
 271                 return parameterMap;
 272         }
 273
 274         /**
 275          * Wrapper around a web-of-trust identity.
 276          *
 277          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 278          */
 279         public static class Identity {
 280
 281                 /** The identity’s identifier. */
 282                 private final String identifier;
 283
 284                 /** The identity’s nickname. */
 285                 private final String nickname;
 286
 287                 /** The identity’s request URI. */
 288                 private final String requestUri;
 289
 290                 /**
 291                  * Creates a new identity.
 292                  *
 293                  * @param identifier
 294                  *            The identifies of the identity
 295                  * @param nickname
 296                  *            The nickname of the identity
 297                  * @param requestUri
 298                  *            The request URI of the identity
 299                  */
 300                 public Identity(String identifier, String nickname, String requestUri) {
 301                         this.identifier = identifier;
 302                         this.nickname = nickname;
 303                         this.requestUri = requestUri;
 304                 }
 305
 306                 /**
 307                  * Returns the identifier of this identity.
 308                  *
 309                  * @return This identity’s identifier
 310                  */
 311                 public String getIdentifier() {
 312                         return identifier;
 313                 }
 314
 315                 /**
 316                  * Returns the nickname of this identity.
 317                  *
 318                  * @return This identity’s nickname
 319                  */
 320                 public String getNickname() {
 321                         return nickname;
 322                 }
 323
 324                 /**
 325                  * Returns the request URI of this identity.
 326                  *
 327                  * @return This identity’s request URI
 328                  */
 329                 public String getRequestUri() {
 330                         return requestUri;
 331                 }
 332
 333         }
 334
 335         /**
 336          * Container for the trust given from one identity to another.
 337          *
 338          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 339          */
 340         public static class IdentityTrust {
 341
 342                 /** The trust given to the identity. */
 343                 private final byte trust;
 344
 345                 /** The command for the trust value. */
 346                 private final String comment;
 347
 348                 /**
 349                  * Creates a new identity trust container.
 350                  *
 351                  * @param trust
 352                  *            The trust given to the identity
 353                  * @param comment
 354                  *            The comment for the trust value
 355                  */
 356                 public IdentityTrust(byte trust, String comment) {
 357                         this.trust = trust;
 358                         this.comment = comment;
 359                 }
 360
 361                 /**
 362                  * Returns the trust value given to the identity.
 363                  *
 364                  * @return The trust value
 365                  */
 366                 public byte getTrust() {
 367                         return trust;
 368                 }
 369
 370                 /**
 371                  * Returns the comment for the trust value.
 372                  *
 373                  * @return The comment for the trust value
 374                  */
 375                 public String getComment() {
 376                         return comment;
 377                 }
 378
 379         }
 380
 381         /**
 382          * Container that stores the trust that is calculated by taking all trustees
 383          * and their trust lists into account.
 384          *
 385          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 386          */
 387         public static class CalculatedTrust {
 388
 389                 /** The calculated trust value. */
 390                 private final Byte trust;
 391
 392                 /** The calculated score value. */
 393                 private final Integer score;
 394
 395                 /** The calculated rank. */
 396                 private final Integer rank;
 397
 398                 /**
 399                  * Creates a new calculated trust container.
 400                  *
 401                  * @param trust
 402                  *            The calculated trust value
 403                  * @param score
 404                  *            The calculated score value
 405                  * @param rank
 406                  *            The calculated rank of the
 407                  */
 408                 public CalculatedTrust(Byte trust, Integer score, Integer rank) {
 409                         this.trust = trust;
 410                         this.score = score;
 411                         this.rank = rank;
 412                 }
 413
 414                 /**
 415                  * Returns the calculated trust value.
 416                  *
 417                  * @return The calculated trust value, or {@code null} if the trust
 418                  *         value is not known
 419                  */
 420                 public Byte getTrust() {
 421                         return trust;
 422                 }
 423
 424                 /**
 425                  * Returns the calculated score value.
 426                  *
 427                  * @return The calculated score value, or {@code null} if the score
 428                  *         value is not known
 429                  */
 430                 public Integer getScore() {
 431                         return score;
 432                 }
 433
 434                 /**
 435                  * Returns the calculated rank.
 436                  *
 437                  * @return The calculated rank, or {@code null} if the rank is not known
 438                  */
 439                 public Integer getRank() {
 440                         return rank;
 441                 }
 442
 443         }
 444
 445         /**
 446          * Wrapper around a web-of-trust own identity.
 447          *
 448          * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
 449          */
 450         public static class OwnIdentity extends Identity {
 451
 452                 /** The identity’s insert URI. */
 453                 private final String insertUri;
 454
 455                 /**
 456                  * Creates a new web-of-trust own identity.
 457                  *
 458                  * @param identifier
 459                  *            The identifier of the identity
 460                  * @param nickname
 461                  *            The nickname of the identity
 462                  * @param requestUri
 463                  *            The request URI of the identity
 464                  * @param insertUri
 465                  *            The insert URI of the identity
 466                  */
 467                 public OwnIdentity(String identifier, String nickname, String requestUri, String insertUri) {
 468                         super(identifier, nickname, requestUri);
 469                         this.insertUri = insertUri;
 470                 }
 471
 472                 /**
 473                  * Returns the insert URI of this identity.
 474                  *
 475                  * @return This identity’s insert URI
 476                  */
 477                 public String getInsertUri() {
 478                         return insertUri;
 479                 }
 480
 481         }
 482
 483 }