src/main/kotlin/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.kt

   1 /*
   2  * Sone - IdentityManagerImpl.kt - Copyright © 2010–2020 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 com.google.common.eventbus.*
  21 import com.google.inject.*
  22 import net.pterodactylus.util.service.*
  23 import java.util.concurrent.TimeUnit.*
  24 import java.util.logging.*
  25 import java.util.logging.Logger.*
  26
  27 /**
  28  * The identity manager takes care of loading and storing identities, their
  29  * contexts, and properties. It does so in a way that does not expose errors via
  30  * exceptions but it only logs them and tries to return sensible defaults.
  31  *
  32  *
  33  * It is also responsible for polling identities from the Web of Trust plugin
  34  * and sending events to the [EventBus] when [Identity]s and
  35  * [OwnIdentity]s are discovered or disappearing.
  36  */
  37 @Singleton
  38 class IdentityManagerImpl @Inject constructor(
  39                 private val eventBus: EventBus,
  40                 private val webOfTrustConnector: WebOfTrustConnector,
  41                 private val identityLoader: IdentityLoader
  42 ) : AbstractService("Sone Identity Manager", false), IdentityManager {
  43
  44         private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
  45
  46         override val isConnected: Boolean
  47                 get() = notThrowing { webOfTrustConnector.ping() }
  48
  49         override val allOwnIdentities: Set<OwnIdentity>
  50                 get() = synchronized(currentOwnIdentities) {
  51                         currentOwnIdentities.toSet()
  52                 }
  53
  54         override fun serviceRun() {
  55                 var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
  56
  57                 while (!shouldStop()) {
  58                         try {
  59                                 val currentIdentities = identityLoader.loadTrustedIdentities()
  60
  61                                 val identitiesWithTrust = currentIdentities.values.flatten()
  62                                                 .groupBy { it.id }
  63                                                 .mapValues { (_, identities) ->
  64                                                         identities.reduce { accIdentity, identity ->
  65                                                                 identity.trust.forEach { (ownIdentity: OwnIdentity?, trust: Trust?) ->
  66                                                                         accIdentity.setTrust(ownIdentity, trust)
  67                                                                 }
  68                                                                 accIdentity
  69                                                         }
  70                                                 }
  71
  72                                 val onlyTrustedByAll = currentIdentities.mapValues { (_, trustedIdentities) ->
  73                                         trustedIdentities.filter { trustedIdentity ->
  74                                                 identitiesWithTrust[trustedIdentity.id]!!.trust.all { it.value.hasZeroOrPositiveTrust() }
  75                                         }
  76                                 }
  77                                 logger.log(Level.FINE, "Reduced (${currentIdentities.size},(${currentIdentities.values.joinToString { it.size.toString() }})) identities to (${onlyTrustedByAll.size},(${onlyTrustedByAll.values.joinToString { it.size.toString() }})).")
  78
  79                                 val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
  80                                 identityChangeEventSender.detectChanges(currentIdentities)
  81
  82                                 oldIdentities = currentIdentities
  83
  84                                 synchronized(currentOwnIdentities) {
  85                                         currentOwnIdentities.clear()
  86                                         currentOwnIdentities.addAll(currentIdentities.keys)
  87                                 }
  88                         } catch (wote1: WebOfTrustException) {
  89                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1)
  90                         } catch (e: Exception) {
  91                                 logger.log(Level.SEVERE, "Uncaught exception in IdentityManager thread!", e)
  92                         }
  93
  94                         /* wait a minute before checking again. */
  95                         sleep(SECONDS.toMillis(60))
  96                 }
  97         }
  98
  99 }
 100
 101 private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
 102
 103 private fun notThrowing(action: () -> Unit): Boolean =
 104                 try {
 105                         action()
 106                         true
 107                 } catch (e: Exception) {
 108                         false
 109                 }
 110
 111 private fun Trust.hasZeroOrPositiveTrust() =
 112                 if (explicit == null) {
 113                         implicit == null || implicit >= 0
 114                 } else {
 115                         explicit >= 0
 116                 }