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

   1 package net.pterodactylus.sone.freenet.wot
   2
   3 /**
   4  * Filter for identities that retains only those remote identities that do
   5  * not have a single negative trust value (explicit or implicit) from any own
   6  * identity.
   7  */
   8 class NoNegativeIdentityFilter {
   9
  10         fun filter(identities: Map<OwnIdentity, Set<Identity>>) =
  11                 identities.run {
  12                         val identitiesWithTrust = values.flatten()
  13                                 .groupBy { it.id }
  14                                 .mapValues { (_, identities) ->
  15                                         identities.reduce { accIdentity, identity ->
  16                                                 identity.trust.forEach { (ownIdentity: OwnIdentity?, trust: Trust?) ->
  17                                                         accIdentity.setTrust(ownIdentity, trust)
  18                                                 }
  19                                                 accIdentity
  20                                         }
  21                                 }
  22
  23                         mapValues { (_, trustedIdentities) ->
  24                                 trustedIdentities.filter { trustedIdentity ->
  25                                         identitiesWithTrust[trustedIdentity.id]!!.trust.all { it.value.hasZeroOrPositiveTrust() }
  26                                 }
  27                         }
  28                 }
  29
  30 }
  31
  32 private fun Trust.hasZeroOrPositiveTrust() =
  33                 if (explicit == null) {
  34                         implicit == null || implicit >= 0
  35                 } else {
  36                         explicit >= 0
  37                 }