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
  27 import net.pterodactylus.util.object.Default;
  28 import net.pterodactylus.wotns.freenet.wot.Identity;
  29 import net.pterodactylus.wotns.freenet.wot.IdentityManager;
  30 import net.pterodactylus.wotns.freenet.wot.OwnIdentity;
  31 import net.pterodactylus.wotns.freenet.wot.Trust;
  32 import freenet.keys.FreenetURI;
  33
  34 /**
  35  * TODO
  36  *
  37  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  38  */
  39 public class Resolver {
  40
  41         private final IdentityManager identityManager;
  42
  43         private String ownIdentityId;
  44
  45         public Resolver(IdentityManager identityManager) {
  46                 this.identityManager = identityManager;
  47         }
  48
  49         public String getOwnIdentityId() {
  50                 return ownIdentityId;
  51         }
  52
  53         public void setOwnIdentityId(String ownIdentityId) {
  54                 this.ownIdentityId = ownIdentityId;
  55         }
  56
  57         //
  58         // ACTIONS
  59         //
  60
  61         public FreenetURI resolveURI(String shortUri) throws MalformedURLException {
  62                 int firstSlash = shortUri.indexOf('/');
  63                 if (firstSlash == -1) {
  64                         throw new MalformedURLException("At least one slash is required.");
  65                 }
  66                 String shortName = shortUri.substring(0, firstSlash);
  67                 String target = shortUri.substring(firstSlash + 1);
  68                 Identity identity = locateIdentity(shortName);
  69                 System.out.println("located identity: " + identity);
  70                 if (identity == null) {
  71                         return null;
  72                 }
  73                 return new FreenetURI(identity.getProperty("tns." + target));
  74         }
  75
  76         //
  77         // PRIVATE METHODS
  78         //
  79
  80         private Identity locateIdentity(String shortName) {
  81                 int atSign = shortName.indexOf('@');
  82                 String identityName = shortName;
  83                 String keyStart = "";
  84                 if (atSign > -1) {
  85                         identityName = shortName.substring(0, atSign);
  86                         keyStart = shortName.substring(atSign + 1);
  87                 }
  88                 @SuppressWarnings("hiding")
  89                 final OwnIdentity ownIdentity;
  90                 if ((this.ownIdentityId != null) && (identityManager.getOwnIdentity(this.ownIdentityId) != null)) {
  91                         ownIdentity = identityManager.getOwnIdentity(this.ownIdentityId);
  92                 } else if (this.ownIdentityId == null) {
  93                         Set<OwnIdentity> ownIdentities = identityManager.getAllOwnIdentities();
  94                         if (!ownIdentities.isEmpty()) {
  95                                 ownIdentity = ownIdentities.iterator().next();
  96                         } else {
  97                                 ownIdentity = null;
  98                         }
  99                 } else {
 100                         ownIdentity = null;
 101                 }
 102                 if (ownIdentity == null) {
 103                         return null;
 104                 }
 105                 System.out.println("using own identity " + ownIdentity + " to resolve " + shortName);
 106                 Set<Identity> trustedIdentities = Default.forNull(identityManager.getTrustedIdentities(ownIdentity), Collections.<Identity> emptySet());
 107                 List<Identity> matchingIdentities = new ArrayList<Identity>();
 108                 System.out.println("checking " + trustedIdentities);
 109                 for (Identity identity : trustedIdentities) {
 110                         if (identity.getNickname().equals(identityName) && identity.getId().startsWith(keyStart)) {
 111                                 matchingIdentities.add(identity);
 112                         }
 113                 }
 114                 if (matchingIdentities.isEmpty()) {
 115                         return null;
 116                 }
 117                 Collections.sort(matchingIdentities, new Comparator<Identity>() {
 118
 119                         @Override
 120                         public int compare(Identity leftIdentity, Identity rightIdentity) {
 121                                 Trust leftTrust = leftIdentity.getTrust(ownIdentity);
 122                                 Trust rightTrust = rightIdentity.getTrust(ownIdentity);
 123                                 int leftTrustCombined = ((leftTrust.getExplicit() != null) ? leftTrust.getExplicit() : 0) + ((leftTrust.getImplicit() != null) ? leftTrust.getImplicit() : 0);
 124                                 int rightTrustCombined = ((rightTrust.getExplicit() != null) ? rightTrust.getExplicit() : 0) + ((rightTrust.getImplicit() != null) ? rightTrust.getImplicit() : 0);
 125                                 return leftTrustCombined - rightTrustCombined;
 126                         }
 127                 });
 128                 return matchingIdentities.get(0);
 129         }
 130
 131 }