Improves the performance and logging structures for the anti-spam filter.

amethyst/src/main/java/com/vitorpamplona/amethyst/DebugUtils.kt

@@ -112,7 +112,7 @@ fun debugState(context: Context) {
     Log.d(
         "STATE DUMP",
         "Spam: " +
-            LocalCache.antiSpam.spamMessages.size() + " / " + LocalCache.antiSpam.recentMessages.size(),
+            LocalCache.antiSpam.spamMessages.size() + " / " + LocalCache.antiSpam.recentEventIds.size() + " / " + LocalCache.antiSpam.recentAddressables.size(),
     )
 
     Log.d(

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -2265,7 +2265,7 @@ class Account(
         scope.launch(Dispatchers.Default) {
             cache.antiSpam.flowSpam.collect {
                 it.cache.spamMessages.snapshot().values.forEach { spammer ->
-                    if (!hiddenUsers.isHidden(spammer.pubkeyHex) && spammer.duplicatedMessages.size >= 5) {
+                    if (!hiddenUsers.isHidden(spammer.pubkeyHex) && spammer.shouldHide()) {
                         if (spammer.pubkeyHex != userProfile().pubkeyHex && spammer.pubkeyHex !in followingKeySet()) {
                             hiddenUsers.hideUser(spammer.pubkeyHex)
                         }

amethyst/src/main/java/com/vitorpamplona/amethyst/model/AntiSpamFilter.kt

@@ -22,66 +22,78 @@ package com.vitorpamplona.amethyst.model
 
 import android.util.Log
 import android.util.LruCache
-import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.ui.note.njumpLink
+import com.vitorpamplona.quartz.nip01Core.core.AddressableEvent
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.relay.client.stats.RelayStats
 import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.tags.addressables.Address
 import com.vitorpamplona.quartz.nip19Bech32.Nip19Parser
+import com.vitorpamplona.quartz.nip19Bech32.entities.NAddress
 import com.vitorpamplona.quartz.nip19Bech32.entities.NEvent
 import kotlinx.coroutines.flow.MutableStateFlow
 
 data class Spammer(
     val pubkeyHex: HexKey,
-    var duplicatedMessages: Set<HexKey>,
-)
+    var duplicatedEventIds: Set<HexKey>,
+    var duplicatedEventAddresses: Set<Address>,
+) {
+    fun shouldHide() = duplicatedEventIds.size >= 5 || duplicatedEventAddresses.size >= 5
+}
 
 class AntiSpamFilter {
-    val recentMessages = LruCache<Int, String>(1000)
+    val recentEventIds = LruCache<Int, String>(2000)
+    val recentAddressables = LruCache<Int, Address>(2000)
     val spamMessages = LruCache<Int, Spammer>(1000)
 
     var active: Boolean = true
 
+    fun spamHashCode(event: Event): Int = 31 * event.content.hashCode() + event.tags.contentDeepHashCode()
+
     fun isSpam(
         event: Event,
         relay: NormalizedRelayUrl?,
     ): Boolean {
-        checkNotInMainThread()
-
         if (!active) return false
 
-        val idHex = event.id
-
         // if short message, ok
         // The idea here is to avoid considering repeated "GM" messages spam.
-        if (event.content.length < 50) return false
+        if (event.content.length < 60) return false
 
         // if the message is actually short but because it cites a user/event, the nostr: string is
         // really long, make it ok.
         // The idea here is to avoid considering repeated "@Bot, command" messages spam, while still
         // blocking repeated "lnbc..." invoices or fishing urls
-        if (event.content.length < 180 && Nip19Parser.nip19regex.matcher(event.content).find()) return false
+        if (event.content.length < 180 && event.content.startsWith("nostr:") && Nip19Parser.nip19regex.matcher(event.content).find()) return false
 
         // double list strategy:
         // if duplicated, it goes into spam. 1000 spam messages are saved into the spam list.
 
         // Considers tags so that same replies to different people don't count.
-        val hash = (event.content + event.tags.flatten().joinToString(",")).hashCode()
+        val hash = spamHashCode(event)
 
+        // ignores multiple versions of the same addressable.
+        if (event is AddressableEvent) {
+            val address = event.address()
+
+            // normal event
             if (
-            (recentMessages[hash] != null && recentMessages[hash] != idHex) || spamMessages[hash] != null
+                (recentAddressables[hash] != null && recentAddressables[hash] != address) ||
+                (spamMessages[hash] != null && !spamMessages[hash].duplicatedEventAddresses.contains(address))
             ) {
-            Log.w(
-                "Potential SPAM Message",
-                "${event.id} ${recentMessages[hash]} ${spamMessages[hash] != null} ${relay?.url} ${event.content.replace("\n", " | ")}",
-            )
+                val existingAddress = recentAddressables[hash]
+
+                val link1 = njumpLink(NAddress.create(existingAddress.kind, existingAddress.pubKeyHex, existingAddress.dTag, relay))
+                val link2 = njumpLink(NAddress.create(event.kind, event.pubKey, event.dTag(), relay))
+
+                Log.w("Duplicated/SPAM", "${relay?.url} $link1 $link2")
 
                 // Log down offenders
-            logOffender(hash, event)
+                val spammer = logOffender(hash, event)
 
-            if (relay != null) {
-                RelayStats.newSpam(relay, njumpLink(NEvent.create(event.id, event.pubKey, event.kind, relay)))
+                if (spammer.shouldHide() && relay != null) {
+                    RelayStats.newSpam(relay, "$link1 $link2")
                 }
 
                 flowSpam.tryEmit(AntiSpamState(this))
@@ -89,7 +101,34 @@ class AntiSpamFilter {
                 return true
             }
 
-        recentMessages.put(hash, idHex)
+            recentAddressables.put(hash, address)
+        } else {
+            // normal event
+            if (
+                (recentEventIds[hash] != null && recentEventIds[hash] != event.id) ||
+                (spamMessages[hash] != null && !spamMessages[hash].duplicatedEventIds.contains(event.id))
+            ) {
+                val existingEvent = recentEventIds[hash]
+
+                val link1 = njumpLink(NEvent.create(existingEvent, null, null, relay))
+                val link2 = njumpLink(NEvent.create(event.id, null, null, relay))
+
+                Log.w("Duplicated/SPAM", "${relay?.url} $link1 $link2")
+
+                // Log down offenders
+                val spammer = logOffender(hash, event)
+
+                if (spammer.shouldHide() && relay != null) {
+                    RelayStats.newSpam(relay, "$link1 $link2")
+                }
+
+                flowSpam.tryEmit(AntiSpamState(this))
+
+                return true
+            }
+
+            recentEventIds.put(hash, event.id)
+        }
 
         return false
     }
@@ -98,12 +137,33 @@ class AntiSpamFilter {
     private fun logOffender(
         hashCode: Int,
         event: Event,
-    ) {
-        if (spamMessages.get(hashCode) == null) {
-            spamMessages.put(hashCode, Spammer(event.pubKey, setOf(recentMessages[hashCode], event.id)))
-        } else {
+    ): Spammer {
         val spammer = spamMessages.get(hashCode)
-            spammer.duplicatedMessages += event.id
+
+        if (spammer == null) {
+            val newSpammer =
+                if (event is AddressableEvent) {
+                    Spammer(
+                        pubkeyHex = event.pubKey,
+                        duplicatedEventIds = setOf(),
+                        duplicatedEventAddresses = setOf(recentAddressables[hashCode], event.address()),
+                    )
+                } else {
+                    Spammer(
+                        pubkeyHex = event.pubKey,
+                        duplicatedEventIds = setOf(recentEventIds[hashCode], event.id),
+                        duplicatedEventAddresses = setOf(),
+                    )
+                }
+            spamMessages.put(hashCode, newSpammer)
+            return newSpammer
+        } else {
+            if (event is AddressableEvent) {
+                spammer.duplicatedEventAddresses += event.address()
+            } else {
+                spammer.duplicatedEventIds += event.id
+            }
+            return spammer
         }
     }
 

quartz/src/main/java/com/vitorpamplona/quartz/nip01Core/relay/client/NostrClient.kt

@@ -20,7 +20,6 @@
  */
 package com.vitorpamplona.quartz.nip01Core.relay.client
 
-import android.util.Log
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.relay.client.listeners.IRelayClientListener
 import com.vitorpamplona.quartz.nip01Core.relay.client.listeners.RelayState
@@ -115,10 +114,6 @@ class NostrClient(
         subscriptionId: String = newSubId(),
         filters: List<RelayBasedFilter> = listOf(),
     ) {
-        filters.forEach {
-            Log.d("NostrClient", "${it.relay.url} ${it.filter.toJson()}")
-        }
-
         activeSubscriptions.addOrUpdate(subscriptionId, filters)
         relayPool.sendRequest(subscriptionId, filters)
     }