feat: add account setting to forward kind 0 events to local relay

Adds a toggle in the Local Relays settings section that, when enabled,
forwards all received kind 0 (profile/metadata) events to the user's
configured local relays.

- AccountSettings: add sendKind0EventsToLocalRelay MutableStateFlow + toggle method
- LocalPreferences: persist the new setting
- ForwardKind0ToLocalRelayState: uses EventCollector to intercept kind 0
  events from any relay and publish them to local relays when enabled
- Account: instantiate ForwardKind0ToLocalRelayState
- AccountViewModel: expose toggleSendKind0ToLocalRelay
- LocalRelayListView: add Switch toggle above the relay list
- strings.xml: add label and description strings

https://claude.ai/code/session_01Er9VV7nHyDb5pihrunb81F

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

@@ -91,6 +91,7 @@ private object PrefKeys {
     const val NOSTR_PRIVKEY = "nostr_privkey"
     const val NOSTR_PUBKEY = "nostr_pubkey"
     const val LOCAL_RELAY_SERVERS = "localRelayServers"
+    const val SEND_KIND0_TO_LOCAL_RELAY = "sendKind0ToLocalRelay"
     const val DEFAULT_FILE_SERVER = "defaultFileServer"
     const val STRIP_LOCATION_ON_UPLOAD = "stripLocationOnUpload"
     const val DEFAULT_HOME_FOLLOW_LIST = "defaultHomeFollowList"
@@ -359,6 +360,8 @@ object LocalPreferences {
                         remove(PrefKeys.LOCAL_RELAY_SERVERS)
                     }
 
+                    putBoolean(PrefKeys.SEND_KIND0_TO_LOCAL_RELAY, settings.sendKind0EventsToLocalRelay.value)
+
                     putOrRemove(PrefKeys.LATEST_MUTE_LIST, settings.backupMuteList)
                     putOrRemove(PrefKeys.LATEST_PRIVATE_HOME_RELAY_LIST, settings.backupPrivateHomeRelayList)
                     putOrRemove(PrefKeys.LATEST_APP_SPECIFIC_DATA, settings.backupAppSpecificData)
@@ -474,6 +477,7 @@ object LocalPreferences {
                     val hideNIP17WarningDialog = getBoolean(PrefKeys.HIDE_NIP_17_WARNING_DIALOG, false)
                     val hasDonatedInVersion = getStringSet(PrefKeys.HAS_DONATED_IN_VERSION, null) ?: setOf()
                     val localRelayServers = getStringSet(PrefKeys.LOCAL_RELAY_SERVERS, null) ?: setOf()
+                    val sendKind0ToLocalRelay = getBoolean(PrefKeys.SEND_KIND0_TO_LOCAL_RELAY, false)
 
                     val defaultHomeFollowListStr = getString(PrefKeys.DEFAULT_HOME_FOLLOW_LIST, null)
                     val defaultStoriesFollowListStr = getString(PrefKeys.DEFAULT_STORIES_FOLLOW_LIST, null)
@@ -560,6 +564,7 @@ object LocalPreferences {
                         transientAccount = false,
                         externalSignerPackageName = externalSignerPackageName,
                         localRelayServers = MutableStateFlow(localRelayServers),
+                        sendKind0EventsToLocalRelay = MutableStateFlow(sendKind0ToLocalRelay),
                         defaultFileServer = defaultFileServer.await(),
                         stripLocationOnUpload = stripLocationOnUpload,
                         defaultHomeFollowList = MutableStateFlow(defaultHomeFollowList.await()),

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

@@ -39,6 +39,7 @@ import com.vitorpamplona.amethyst.commons.richtext.RichTextParser
 import com.vitorpamplona.amethyst.logTime
 import com.vitorpamplona.amethyst.model.edits.PrivateStorageRelayListDecryptionCache
 import com.vitorpamplona.amethyst.model.edits.PrivateStorageRelayListState
+import com.vitorpamplona.amethyst.model.localRelays.ForwardKind0ToLocalRelayState
 import com.vitorpamplona.amethyst.model.localRelays.LocalRelayListState
 import com.vitorpamplona.amethyst.model.nip01UserMetadata.AccountHomeRelayState
 import com.vitorpamplona.amethyst.model.nip01UserMetadata.AccountOutboxRelayState
@@ -262,6 +263,8 @@ class Account(
 
     val userMetadata = UserMetadataState(signer, cache, scope, settings)
 
+    val forwardKind0ToLocalRelay = ForwardKind0ToLocalRelayState(client, localRelayList, settings)
+
     override val nip47SignerState = NwcSignerState(signer, nwcFilterAssembler, cache, scope, settings.zapPaymentRequest)
 
     val nip65RelayList = Nip65RelayListState(signer, cache, scope, settings)

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

@@ -159,6 +159,7 @@ class AccountSettings(
     val transientAccount: Boolean = false,
     var externalSignerPackageName: String? = null,
     var localRelayServers: MutableStateFlow<Set<String>> = MutableStateFlow(setOf()),
+    val sendKind0EventsToLocalRelay: MutableStateFlow<Boolean> = MutableStateFlow(false),
     var defaultFileServer: ServerName = DEFAULT_MEDIA_SERVERS[0],
     var stripLocationOnUpload: Boolean = true,
     val defaultHomeFollowList: MutableStateFlow<TopFilter> = MutableStateFlow(TopFilter.AllFollows),
@@ -424,6 +425,13 @@ class AccountSettings(
         }
     }
 
+    fun changeSendKind0EventsToLocalRelay(send: Boolean) {
+        if (sendKind0EventsToLocalRelay.value != send) {
+            sendKind0EventsToLocalRelay.tryEmit(send)
+            saveAccountSettings()
+        }
+    }
+
     fun updateUserMetadata(newMetadata: MetadataEvent?) {
         if (newMetadata == null) return
 

amethyst/src/main/java/com/vitorpamplona/amethyst/model/localRelays/ForwardKind0ToLocalRelayState.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.model.localRelays
+
+import com.vitorpamplona.amethyst.model.AccountSettings
+import com.vitorpamplona.quartz.nip01Core.metadata.MetadataEvent
+import com.vitorpamplona.quartz.nip01Core.relay.client.INostrClient
+import com.vitorpamplona.quartz.nip01Core.relay.client.accessories.EventCollector
+
+class ForwardKind0ToLocalRelayState(
+    val client: INostrClient,
+    val localRelayList: LocalRelayListState,
+    val settings: AccountSettings,
+) {
+    private val eventCollector =
+        EventCollector(client) { event, _ ->
+            if (event is MetadataEvent && settings.sendKind0EventsToLocalRelay.value) {
+                val localRelays = localRelayList.flow.value
+                if (localRelays.isNotEmpty()) {
+                    client.publish(event, localRelays)
+                }
+            }
+        }
+
+    fun destroy() {
+        eventCollector.destroy()
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -1144,6 +1144,10 @@ class AccountViewModel(
 
     fun filterSpamFromStrangers() = account.settings.syncedSettings.security.filterSpamFromStrangers
 
+    fun toggleSendKind0ToLocalRelay(enabled: Boolean) {
+        account.settings.changeSendKind0EventsToLocalRelay(enabled)
+    }
+
     fun updateWarnReports(warnReports: Boolean) = launchSigner { account.updateWarnReports(warnReports) }
 
     fun updateFilterSpam(filterSpam: Boolean) =

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/relays/local/LocalRelayListView.kt

@@ -25,11 +25,16 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
 import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.material3.Switch
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.ui.navigation.navs.rememberExtendedNav
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
@@ -37,6 +42,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.relays.common.BasicRelaySet
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.relays.common.BasicRelaySetupInfoDialog
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.relays.common.RelayUrlEditField
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.relays.common.relaySetupInfoBuilder
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.settings.SettingsRow
 import com.vitorpamplona.amethyst.ui.theme.FeedPadding
 import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
 
@@ -65,6 +71,25 @@ fun LazyListScope.renderLocalItems(
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
+    item {
+        val sendKind0 by accountViewModel.account.settings.sendKind0EventsToLocalRelay
+            .collectAsStateWithLifecycle()
+        var checked by remember(sendKind0) { mutableStateOf(sendKind0) }
+
+        SettingsRow(
+            R.string.send_kind0_to_local_relay_title,
+            R.string.send_kind0_to_local_relay_description,
+        ) {
+            Switch(
+                checked = checked,
+                onCheckedChange = {
+                    checked = it
+                    accountViewModel.toggleSendKind0ToLocalRelay(it)
+                },
+            )
+        }
+    }
+
     itemsIndexed(feedState, key = { _, item -> "Local" + item.relay.url }) { index, item ->
         BasicRelaySetupInfoDialog(
             item,

amethyst/src/main/res/values/strings.xml

@@ -1517,6 +1517,8 @@
     <string name="search_section_explainer">List of relays to use when searching content or users. Tagging and search will not work if no options are available. Make sure they implement NIP-50.</string>
     <string name="local_section">Local Relays</string>
     <string name="local_section_explainer">List of relays that are running in this device.</string>
+    <string name="send_kind0_to_local_relay_title">Forward profiles to local relay</string>
+    <string name="send_kind0_to_local_relay_description">Send all received profile (kind 0) events to your local relay</string>
 
     <string name="trusted_relays_title">Trusted Relays</string>
     <string name="trusted_section">Trusted Relays</string>