src/main/java/net/pterodactylus/wotns/main/Resolver.java

   1 /*
   2  * WoTNS - Resolver.java - Copyright © 2011 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.wotns.main;
  19
  20 import java.net.MalformedURLException;
  21 import java.util.ArrayList;
  22 import java.util.Collections;
  23 import java.util.Comparator;
  24 import java.util.List;
  25 import java.util.Set;
  26 import java.util.logging.Level;
  27 import java.util.logging.Logger;
  28
  29 import net.pterodactylus.util.logging.Logging;
  30 import net.pterodactylus.util.object.Default;
  31 import net.pterodactylus.wotns.freenet.wot.Identity;
  32 import net.pterodactylus.wotns.freenet.wot.IdentityManager;
  33 import net.pterodactylus.wotns.freenet.wot.OwnIdentity;
  34 import net.pterodactylus.wotns.freenet.wot.Trust;
  35 import freenet.keys.FreenetURI;
  36
  37 /**
  38  * TODO
  39  *
  40  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  41  */
  42 public class Resolver {
  43
  44         private static final Logger logger = Logging.getLogger(Resolver.class);
  45
  46         private final IdentityManager identityManager;
  47
  48         private String ownIdentityId;
  49
  50         public Resolver(IdentityManager identityManager) {
  51                 this.identityManager = identityManager;
  52         }
  53
  54         public String getOwnIdentityId() {
  55                 return ownIdentityId;
  56         }
  57
  58         public void setOwnIdentityId(String ownIdentityId) {
  59                 this.ownIdentityId = ownIdentityId;
  60         }
  61
  62         //
  63         // ACTIONS
  64         //
  65
  66         public FreenetURI resolveURI(String shortUri) throws MalformedURLException {
  67                 int firstSlash = shortUri.indexOf('/');
  68                 if (firstSlash == -1) {
  69                         throw new MalformedURLException("At least one slash is required.");
  70                 }
  71                 String shortName = shortUri.substring(0, firstSlash);
  72                 String target = shortUri.substring(firstSlash + 1);
  73                 Identity identity = locateIdentity(shortName);
  74                 System.out.println("located identity: " + identity);
  75                 if (identity == null) {
  76                         return null;
  77                 }
  78                 return new FreenetURI(identity.getProperty("tns." + target));
  79         }
  80
  81         //
  82         // PRIVATE METHODS
  83         //
  84
  85         private Identity locateIdentity(String shortName) {
  86                 int atSign = shortName.indexOf('@');
  87                 String identityName = shortName;
  88                 String keyStart = "";
  89                 if (atSign > -1) {
  90                         identityName = shortName.substring(0, atSign);
  91                         keyStart = shortName.substring(atSign + 1);
  92                 }
  93                 final OwnIdentity ownIdentity;
  94                 if ((this.ownIdentityId != null) && (identityManager.getOwnIdentity(this.ownIdentityId) != null)) {
  95                         ownIdentity = identityManager.getOwnIdentity(this.ownIdentityId);
  96                 } else if (this.ownIdentityId == null) {
  97                         Set<OwnIdentity> ownIdentities = identityManager.getAllOwnIdentities();
  98                         if (!ownIdentities.isEmpty()) {
  99                                 ownIdentity = ownIdentities.iterator().next();
 100                         } else {
 101                                 ownIdentity = null;
 102                         }
 103                 } else {
 104                         logger.log(Level.SEVERE, "Can not resolve “" + shortName + "” without a Web of Trust Identity!");
 105                         ownIdentity = null;
 106                 }
 107                 if (ownIdentity == null) {
 108                         return null;
 109                 }
 110                 System.out.println("using own identity " + ownIdentity + " to resolve " + shortName);
 111                 Set<Identity> trustedIdentities = Default.forNull(identityManager.getTrustedIdentities(ownIdentity), Collections.<Identity> emptySet());
 112                 List<Identity> matchingIdentities = new ArrayList<Identity>();
 113                 System.out.println("checking " + trustedIdentities);
 114                 for (Identity identity : trustedIdentities) {
 115                         if (identity.getNickname().equals(identityName) && identity.getId().startsWith(keyStart)) {
 116                                 matchingIdentities.add(identity);
 117                         }
 118                 }
 119                 if (matchingIdentities.isEmpty()) {
 120                         return null;
 121                 }
 122                 Collections.sort(matchingIdentities, new Comparator<Identity>() {
 123
 124                         @Override
 125                         public int compare(Identity leftIdentity, Identity rightIdentity) {
 126                                 Trust leftTrust = leftIdentity.getTrust(ownIdentity);
 127                                 Trust rightTrust = rightIdentity.getTrust(ownIdentity);
 128                                 int leftTrustCombined = ((leftTrust.getExplicit() != null) ? leftTrust.getExplicit() : 0) + ((leftTrust.getImplicit() != null) ? leftTrust.getImplicit() : 0);
 129                                 int rightTrustCombined = ((rightTrust.getExplicit() != null) ? rightTrust.getExplicit() : 0) + ((rightTrust.getImplicit() != null) ? rightTrust.getImplicit() : 0);
 130                                 return leftTrustCombined - rightTrustCombined;
 131                         }
 132                 });
 133                 return matchingIdentities.get(0);
 134         }
 135
 136 }