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.EventBus
  21 import com.google.common.eventbus.Subscribe
  22 import com.google.inject.Inject
  23 import com.google.inject.Singleton
  24 import net.pterodactylus.sone.core.event.StrictFilteringActivatedEvent
  25 import net.pterodactylus.sone.core.event.StrictFilteringDeactivatedEvent
  26 import net.pterodactylus.util.service.AbstractService
  27 import java.util.concurrent.TimeUnit.SECONDS
  28 import java.util.concurrent.atomic.AtomicBoolean
  29 import java.util.logging.Level
  30 import java.util.logging.Logger
  31 import java.util.logging.Logger.getLogger
  32
  33 /**
  34  * The identity manager takes care of loading and storing identities, their
  35  * contexts, and properties. It does so in a way that does not expose errors via
  36  * exceptions but it only logs them and tries to return sensible defaults.
  37  *
  38  *
  39  * It is also responsible for polling identities from the Web of Trust plugin
  40  * and sending events to the [EventBus] when [Identity]s and
  41  * [OwnIdentity]s are discovered or disappearing.
  42  */
  43 @Singleton
  44 class IdentityManagerImpl @Inject constructor(
  45                 private val eventBus: EventBus,
  46                 private val webOfTrustConnector: WebOfTrustConnector,
  47                 private val identityLoader: IdentityLoader
  48 ) : AbstractService("Sone Identity Manager", false), IdentityManager {
  49
  50         private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
  51         private val strictFiltering = AtomicBoolean(false)
  52
  53         override val isConnected: Boolean
  54                 get() = notThrowing { webOfTrustConnector.ping() }
  55
  56         override val allOwnIdentities: Set<OwnIdentity>
  57                 get() = synchronized(currentOwnIdentities) {
  58                         currentOwnIdentities.toSet()
  59                 }
  60
  61         override fun serviceRun() {
  62                 var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
  63
  64                 while (!shouldStop()) {
  65                         try {
  66                                 val currentIdentities = identityLoader.loadAllIdentities().applyStrictFiltering()
  67
  68                                 val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
  69                                 identityChangeEventSender.detectChanges(currentIdentities)
  70
  71                                 oldIdentities = currentIdentities
  72
  73                                 synchronized(currentOwnIdentities) {
  74                                         currentOwnIdentities.clear()
  75                                         currentOwnIdentities.addAll(currentIdentities.keys)
  76                                 }
  77                         } catch (wote1: WebOfTrustException) {
  78                                 logger.log(Level.WARNING, "WoT has disappeared!", wote1)
  79                         } catch (e: Exception) {
  80                                 logger.log(Level.SEVERE, "Uncaught exception in IdentityManager thread!", e)
  81                         }
  82
  83                         /* wait a minute before checking again. */
  84                         sleep(SECONDS.toMillis(60))
  85                 }
  86         }
  87
  88         private fun Map<OwnIdentity, Set<Identity>>.applyStrictFiltering() =
  89                         if (strictFiltering.get()) {
  90                                 val identitiesWithTrust = values.flatten()
  91                                                 .groupBy { it.id }
  92                                                 .mapValues { (_, identities) ->
  93                                                         identities.reduce { accIdentity, identity ->
  94                                                                 identity.trust.forEach { (ownIdentity: OwnIdentity?, trust: Trust?) ->
  95                                                                         accIdentity.setTrust(ownIdentity, trust)
  96                                                                 }
  97                                                                 accIdentity
  98                                                         }
  99                                                 }
 100
 101                                 mapValues { (_, trustedIdentities) ->
 102                                         trustedIdentities.filter { trustedIdentity ->
 103                                                 identitiesWithTrust[trustedIdentity.id]!!.trust.all { it.value.hasZeroOrPositiveTrust() }
 104                                         }
 105                                 }
 106                         } else {
 107                                 this
 108                         }
 109
 110         @Subscribe
 111         fun strictFilteringActivated(event: StrictFilteringActivatedEvent) {
 112                 strictFiltering.set(true)
 113         }
 114
 115         @Subscribe
 116         fun strictFilteringDeactivated(event: StrictFilteringDeactivatedEvent) {
 117                 strictFiltering.set(false)
 118         }
 119
 120 }
 121
 122 private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
 123
 124 private fun notThrowing(action: () -> Unit): Boolean =
 125                 try {
 126                         action()
 127                         true
 128                 } catch (e: Exception) {
 129                         false
 130                 }
 131
 132 private fun Trust.hasZeroOrPositiveTrust() =
 133                 if (explicit == null) {
 134                         implicit == null || implicit >= 0
 135                 } else {
 136                         explicit >= 0
 137                 }