attempt to add own filters and event kinds for NIP90 content related events

app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -89,6 +89,8 @@ import com.vitorpamplona.quartz.events.LnZapRequestEvent
 import com.vitorpamplona.quartz.events.LongTextNoteEvent
 import com.vitorpamplona.quartz.events.MetadataEvent
 import com.vitorpamplona.quartz.events.MuteListEvent
+import com.vitorpamplona.quartz.events.NIP90ContentDiscoveryRequestEvent
+import com.vitorpamplona.quartz.events.NIP90ContentDiscoveryResponseEvent
 import com.vitorpamplona.quartz.events.NNSEvent
 import com.vitorpamplona.quartz.events.OtsEvent
 import com.vitorpamplona.quartz.events.PeopleListEvent
@@ -384,6 +386,62 @@ object LocalCache {
         refreshObservers(note)
     }
 
+    fun consume(
+        event: NIP90ContentDiscoveryResponseEvent,
+        relay: Relay? = null,
+    ) {
+        val note = getOrCreateNote(event.id)
+        val author = getOrCreateUser(event.pubKey)
+
+        if (relay != null) {
+            author.addRelayBeingUsed(relay, event.createdAt)
+            note.addRelay(relay)
+        }
+
+        // Already processed this event.
+        if (note.event != null) return
+
+        val replyTo = computeReplyTo(event)
+
+        note.loadEvent(event, author, replyTo)
+
+        // Log.d("TN", "New Note (${notes.size},${users.size}) ${note.author?.toBestDisplayName()}
+        // ${note.event?.content()?.split("\n")?.take(100)} ${formattedDateTime(event.createdAt)}")
+
+        // Counts the replies
+        replyTo.forEach { it.addReply(note) }
+
+        refreshObservers(note)
+    }
+
+    fun consume(
+        event: NIP90ContentDiscoveryRequestEvent,
+        relay: Relay? = null,
+    ) {
+        val note = getOrCreateNote(event.id)
+        val author = getOrCreateUser(event.pubKey)
+
+        if (relay != null) {
+            author.addRelayBeingUsed(relay, event.createdAt)
+            note.addRelay(relay)
+        }
+
+        // Already processed this event.
+        if (note.event != null) return
+
+        val replyTo = computeReplyTo(event)
+
+        note.loadEvent(event, author, replyTo)
+
+        // Log.d("TN", "New Note (${notes.size},${users.size}) ${note.author?.toBestDisplayName()}
+        // ${note.event?.content()?.split("\n")?.take(100)} ${formattedDateTime(event.createdAt)}")
+
+        // Counts the replies
+        replyTo.forEach { it.addReply(note) }
+
+        refreshObservers(note)
+    }
+
     fun consume(
         event: GitPatchEvent,
         relay: Relay? = null,
@@ -2299,6 +2357,8 @@ object LocalCache {
                     }
                 }
                 is LnZapRequestEvent -> consume(event)
+                is NIP90ContentDiscoveryResponseEvent -> consume(event, relay)
+                is NIP90ContentDiscoveryRequestEvent -> consume(event, relay)
                 is LnZapPaymentRequestEvent -> consume(event)
                 is LnZapPaymentResponseEvent -> consume(event)
                 is LongTextNoteEvent -> consume(event, relay)

app/src/main/java/com/vitorpamplona/amethyst/service/NostrDiscoveryDataSource.kt

@@ -35,6 +35,8 @@ import com.vitorpamplona.quartz.events.CommunityDefinitionEvent
 import com.vitorpamplona.quartz.events.CommunityPostApprovalEvent
 import com.vitorpamplona.quartz.events.LiveActivitiesChatMessageEvent
 import com.vitorpamplona.quartz.events.LiveActivitiesEvent
+import com.vitorpamplona.quartz.events.NIP90ContentDiscoveryResponseEvent
+import com.vitorpamplona.quartz.events.NIP90StatusEvent
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
@@ -151,6 +153,24 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
         )
     }
 
+    fun createNIP90ResponseFilter(): List<TypedFilter> {
+        return listOfNotNull(
+            TypedFilter(
+                types = setOf(FeedType.GLOBAL),
+                filter =
+                    JsonFilter(
+                        kinds = listOf(NIP90ContentDiscoveryResponseEvent.KIND, NIP90StatusEvent.KIND),
+                        limit = 300,
+                        since =
+                            latestEOSEs.users[account.userProfile()]
+                                ?.followList
+                                ?.get(account.defaultDiscoveryFollowList.value)
+                                ?.relayList,
+                    ),
+            ),
+        )
+    }
+
     fun createLiveStreamFilter(): List<TypedFilter> {
         val follows = account.liveDiscoveryFollowLists.value?.users?.toList()
 
@@ -425,6 +445,7 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
         discoveryFeedChannel.typedFilters =
             createLiveStreamFilter()
                 .plus(createNIP89Filter(listOf("5300")))
+                .plus(createNIP90ResponseFilter())
                 .plus(createPublicChatFilter())
                 .plus(createMarketplaceFilter())
                 .plus(
@@ -438,6 +459,7 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
                         createPublicChatsGeohashesFilter(),
                     ),
                 )
+                .toList()
                 .ifEmpty { null }
     }
 }

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/NIP90ContentDiscoveryFilter.kt

@@ -23,24 +23,64 @@ package com.vitorpamplona.amethyst.ui.dal
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.quartz.events.MuteListEvent
+import com.vitorpamplona.quartz.events.NIP90ContentDiscoveryResponseEvent
+import com.vitorpamplona.quartz.events.PeopleListEvent
 
-class NIP90ContentDiscoveryFilter(val account: Account) : FeedFilter<Note>() {
+open class NIP90ContentDiscoveryFilter(
+    val account: Account,
+) : AdditiveFeedFilter<Note>() {
     override fun feedKey(): String {
-        return account.userProfile().latestBookmarkList?.id ?: ""
+        return account.userProfile().pubkeyHex + "-" + followList()
+    }
+
+    open fun followList(): String {
+        return account.defaultDiscoveryFollowList.value
+    }
+
+    override fun showHiddenKey(): Boolean {
+        return followList() == PeopleListEvent.blockListFor(account.userProfile().pubkeyHex) ||
+            followList() == MuteListEvent.blockListFor(account.userProfile().pubkeyHex)
     }
 
-    // TODO
     override fun feed(): List<Note> {
-        val bookmarks = account.userProfile().latestBookmarkList
+        val params = buildFilterParams(account)
 
         val notes =
-            bookmarks?.taggedEvents()?.mapNotNull { LocalCache.checkGetOrCreateNote(it) } ?: emptyList()
-        val addresses =
-            bookmarks?.taggedAddresses()?.map { LocalCache.getOrCreateAddressableNote(it) } ?: emptyList()
+            LocalCache.notes.filterIntoSet { _, it ->
+                val noteEvent = it.event
+                noteEvent is NIP90ContentDiscoveryResponseEvent // && params.match(noteEvent)
+            }
 
-        return notes
-            .plus(addresses)
-            .toSet()
-            .sortedWith(DefaultFeedOrder)
+        return sort(notes)
+    }
+
+    override fun applyFilter(collection: Set<Note>): Set<Note> {
+        var result = innerApplyFilter(collection)
+        println("Test World")
+        println(result)
+        return result
+    }
+
+    fun buildFilterParams(account: Account): FilterByListParams {
+        return FilterByListParams.create(
+            account.userProfile().pubkeyHex,
+            account.defaultDiscoveryFollowList.value,
+            account.liveDiscoveryFollowLists.value,
+            account.flowHiddenUsers.value,
+        )
+    }
+
+    protected open fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
+        val params = buildFilterParams(account)
+
+        return collection.filterTo(HashSet()) {
+            val noteEvent = it.event
+            noteEvent is NIP90ContentDiscoveryResponseEvent // && params.match(noteEvent)
+        }
+    }
+
+    override fun sort(collection: Set<Note>): List<Note> {
+        return collection.sortedWith(compareBy({ it.createdAt() }, { it.idHex })).reversed()
     }
 }

app/src/main/java/com/vitorpamplona/amethyst/ui/note/Loaders.kt

@@ -234,25 +234,3 @@ fun LoadChannel(
 
     channel?.let { content(it) }
 }
-
-@Composable
-fun LoadDVMNip89(
-    baseChannelHex: String,
-    accountViewModel: AccountViewModel,
-    content: @Composable (Channel) -> Unit,
-) {
-    var channel by
-        remember(baseChannelHex) {
-            mutableStateOf<Channel?>(accountViewModel.getChannelIfExists(baseChannelHex))
-        }
-
-    if (channel == null) {
-        LaunchedEffect(key1 = baseChannelHex) {
-            accountViewModel.checkGetOrCreateChannel(baseChannelHex) { newChannel ->
-                launch(Dispatchers.Main) { channel = newChannel }
-            }
-        }
-    }
-
-    channel?.let { content(it) }
-}

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -96,6 +96,7 @@ import com.vitorpamplona.amethyst.ui.note.types.RenderHighlight
 import com.vitorpamplona.amethyst.ui.note.types.RenderLiveActivityChatMessage
 import com.vitorpamplona.amethyst.ui.note.types.RenderLiveActivityEvent
 import com.vitorpamplona.amethyst.ui.note.types.RenderLongFormContent
+import com.vitorpamplona.amethyst.ui.note.types.RenderNIP90ContentDiscoveryResponse
 import com.vitorpamplona.amethyst.ui.note.types.RenderPinListEvent
 import com.vitorpamplona.amethyst.ui.note.types.RenderPoll
 import com.vitorpamplona.amethyst.ui.note.types.RenderPostApproval
@@ -157,6 +158,7 @@ import com.vitorpamplona.quartz.events.HighlightEvent
 import com.vitorpamplona.quartz.events.LiveActivitiesChatMessageEvent
 import com.vitorpamplona.quartz.events.LiveActivitiesEvent
 import com.vitorpamplona.quartz.events.LongTextNoteEvent
+import com.vitorpamplona.quartz.events.NIP90ContentDiscoveryResponseEvent
 import com.vitorpamplona.quartz.events.PeopleListEvent
 import com.vitorpamplona.quartz.events.PinListEvent
 import com.vitorpamplona.quartz.events.PollNoteEvent
@@ -646,6 +648,19 @@ private fun RenderNoteRow(
                 nav,
             )
         }
+        is NIP90ContentDiscoveryResponseEvent ->
+            RenderNIP90ContentDiscoveryResponse(
+                baseNote,
+                makeItShort,
+                canPreview,
+                quotesLeft,
+                unPackReply,
+                backgroundColor,
+                editState,
+                accountViewModel,
+                nav,
+            )
+
         is PollNoteEvent -> {
             RenderPoll(
                 baseNote,

app/src/main/java/com/vitorpamplona/amethyst/ui/note/types/NIP90ContentDiscoveryResponse.kt

@@ -0,0 +1,181 @@
+/**
+ * Copyright (c) 2024 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.ui.note.types
+
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.State
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.style.TextOverflow
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.ui.components.GenericLoadable
+import com.vitorpamplona.amethyst.ui.components.SensitivityWarning
+import com.vitorpamplona.amethyst.ui.components.TranslatableRichTextViewer
+import com.vitorpamplona.amethyst.ui.note.LoadDecryptedContent
+import com.vitorpamplona.amethyst.ui.note.ReplyNoteComposition
+import com.vitorpamplona.amethyst.ui.note.elements.DisplayUncitedHashtags
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
+import com.vitorpamplona.amethyst.ui.theme.placeholderText
+import com.vitorpamplona.quartz.events.BaseTextNoteEvent
+import com.vitorpamplona.quartz.events.CommunityDefinitionEvent
+import com.vitorpamplona.quartz.events.EmptyTagList
+import com.vitorpamplona.quartz.events.TextNoteEvent
+import com.vitorpamplona.quartz.events.toImmutableListOfLists
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+
+@Composable
+fun RenderNIP90ContentDiscoveryResponse(
+    note: Note,
+    makeItShort: Boolean,
+    canPreview: Boolean,
+    quotesLeft: Int,
+    unPackReply: Boolean,
+    backgroundColor: MutableState<Color>,
+    editState: State<GenericLoadable<EditState>>,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit,
+) {
+    val noteEvent = note.event
+    val modifier = remember(note) { Modifier.fillMaxWidth() }
+
+    if (noteEvent != null) {
+        TranslatableRichTextViewer(
+            content = noteEvent.content(),
+            canPreview = canPreview && !makeItShort,
+            quotesLeft = quotesLeft,
+            modifier = modifier,
+            tags = noteEvent.tags().toImmutableListOfLists(),
+            backgroundColor = backgroundColor,
+            id = note.idHex,
+            accountViewModel = accountViewModel,
+            nav = nav,
+        )
+    }
+
+    val showReply by
+        remember(note) {
+            derivedStateOf {
+                noteEvent is BaseTextNoteEvent && !makeItShort && unPackReply && (note.replyTo != null || noteEvent.hasAnyTaggedUser())
+            }
+        }
+
+    if (showReply) {
+        val replyingDirectlyTo =
+            remember(note) {
+                if (noteEvent is BaseTextNoteEvent) {
+                    val replyingTo = noteEvent.replyingToAddressOrEvent()
+                    if (replyingTo != null) {
+                        val newNote = accountViewModel.getNoteIfExists(replyingTo)
+                        if (newNote != null && newNote.channelHex() == null && newNote.event?.kind() != CommunityDefinitionEvent.KIND) {
+                            newNote
+                        } else {
+                            note.replyTo?.lastOrNull { it.event?.kind() != CommunityDefinitionEvent.KIND }
+                        }
+                    } else {
+                        note.replyTo?.lastOrNull { it.event?.kind() != CommunityDefinitionEvent.KIND }
+                    }
+                } else {
+                    note.replyTo?.lastOrNull { it.event?.kind() != CommunityDefinitionEvent.KIND }
+                }
+            }
+        if (replyingDirectlyTo != null && unPackReply) {
+            ReplyNoteComposition(replyingDirectlyTo, backgroundColor, accountViewModel, nav)
+            Spacer(modifier = StdVertSpacer)
+        }
+    }
+
+    LoadDecryptedContent(
+        note,
+        accountViewModel,
+    ) { body ->
+        val eventContent by
+            remember(note.event) {
+                derivedStateOf {
+                    val subject = (note.event as? TextNoteEvent)?.subject()?.ifEmpty { null }
+                    val newBody =
+                        if (editState.value is GenericLoadable.Loaded) {
+                            val state =
+                                (editState.value as? GenericLoadable.Loaded)?.loaded?.modificationToShow
+                            state?.value?.event?.content() ?: body
+                        } else {
+                            body
+                        }
+
+                    if (!subject.isNullOrBlank() && !newBody.split("\n")[0].contains(subject)) {
+                        "### $subject\n$newBody"
+                    } else {
+                        newBody
+                    }
+                }
+            }
+
+        val isAuthorTheLoggedUser =
+            remember(note.event) { accountViewModel.isLoggedUser(note.author) }
+
+        if (makeItShort && isAuthorTheLoggedUser) {
+            Text(
+                text = eventContent,
+                color = MaterialTheme.colorScheme.placeholderText,
+                maxLines = 2,
+                overflow = TextOverflow.Ellipsis,
+            )
+        } else {
+            SensitivityWarning(
+                note = note,
+                accountViewModel = accountViewModel,
+            ) {
+                val modifier = remember(note) { Modifier.fillMaxWidth() }
+                val tags =
+                    remember(note) { note.event?.tags()?.toImmutableListOfLists() ?: EmptyTagList }
+
+                TranslatableRichTextViewer(
+                    content = eventContent,
+                    canPreview = canPreview && !makeItShort,
+                    quotesLeft = quotesLeft,
+                    modifier = modifier,
+                    tags = tags,
+                    backgroundColor = backgroundColor,
+                    id = note.idHex,
+                    accountViewModel = accountViewModel,
+                    nav = nav,
+                )
+            }
+
+            if (note.event?.hasHashtags() == true) {
+                val hashtags =
+                    remember(note.event) {
+                        note.event?.hashtags()?.toImmutableList() ?: persistentListOf()
+                    }
+                DisplayUncitedHashtags(hashtags, eventContent, nav)
+            }
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt

@@ -54,6 +54,7 @@ import com.vitorpamplona.amethyst.ui.dal.GeoHashFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HashtagFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HomeConversationsFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HomeNewThreadFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.NIP90ContentDiscoveryFilter
 import com.vitorpamplona.amethyst.ui.dal.ThreadFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.UserProfileAppRecommendationsFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.UserProfileBookmarksFeedFilter
@@ -283,7 +284,8 @@ class NostrBookmarkPrivateFeedViewModel(val account: Account) :
 
 @Stable
 class NostrNIP90ContentDiscoveryFeedViewModel(val account: Account) :
-    FeedViewModel(BookmarkPrivateFeedFilter(account)) {
+    // FeedViewModel(BookmarkPrivateFeedFilter(account)) {
+    FeedViewModel(NIP90ContentDiscoveryFilter(account)) {
     class Factory(val account: Account) : ViewModelProvider.Factory {
         override fun <NostrNIP90ContentDiscoveryFeedViewModel : ViewModel> create(modelClass: Class<NostrNIP90ContentDiscoveryFeedViewModel>): NostrNIP90ContentDiscoveryFeedViewModel {
             return NostrNIP90ContentDiscoveryFeedViewModel(account) as NostrNIP90ContentDiscoveryFeedViewModel

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/NIP90ContentDiscoveryScreen.kt

@@ -74,18 +74,18 @@ private fun RenderNostrNIP90ContentDiscoveryScreen(
         }
 
         if (DVMID != null) {
-            // TODO 1 Send KIND 5300 Event with p tag = DVMID (crashes)
+            // TODO 1 Send KIND 5300 Event with p tag = DVMID (crashes, because cant map to event)
 
-            /*
-            var signer = accountViewModel.account.signer
+            /*val signer: NostrSigner = NostrSignerInternal(accountViewModel.account.keyPair)
+            println(accountViewModel.account.keyPair.pubKey.toHexKey())
             NIP90ContentDiscoveryRequestEvent.create(DVMID, signer) {
-                // Client.send(it)
-                // LocalCache.justConsume(it, null)
-            }
+                Client.send(it)
+                LocalCache.justConsume(it, null)
+            } */
 
-             */
+            // var keyPair = accountViewModel.account.keyPair
 
-            // TODO 2 PARSE AND LOAD RESULTS FROM KIND 6300 REPLY to resultfeedmodel (RN this still is the bookmark list)
+            // TODO 2 PARSE AND LOAD RESULTS FROM KIND 6300 REPLY to resultfeedmodel (RN this doesnt show events)
 
             // TODO 3 Render Results (hopefully works when 2 is working)
 

quartz/src/main/java/com/vitorpamplona/quartz/events/NIP90ContentDiscoveryRequestEvent.kt

@@ -35,9 +35,7 @@ class NIP90ContentDiscoveryRequestEvent(
     tags: Array<Array<String>>,
     content: String,
     sig: HexKey,
-) : BaseAddressableEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
-    @Transient private var cachedMetadata: AppMetadata? = null
-
+) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
     companion object {
         const val KIND = 5300
 
@@ -48,12 +46,10 @@ class NIP90ContentDiscoveryRequestEvent(
             onReady: (NIP90ContentDiscoveryRequestEvent) -> Unit,
         ) {
             val content = ""
-
-            // val clientTag = arrayOf("client", "Amethyst")
-
             val tags = mutableListOf<Array<String>>()
             tags.add(arrayOf("p", addressedDVM))
             tags.add(arrayOf("alt", "NIP90 Content Discovery request"))
+            tags.add(arrayOf("client", "Amethyst"))
             signer.sign(createdAt, KIND, tags.toTypedArray(), content, onReady)
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/events/NIP90ContentDiscoveryResponseEvent.kt

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2024 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.quartz.events
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.encoders.HexKey
+import com.vitorpamplona.quartz.signers.NostrSigner
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class NIP90ContentDiscoveryResponseEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
+    companion object {
+        const val KIND = 6300
+        const val ALT = "NIP90 Content Discovery reply"
+
+        fun create(
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+            onReady: (AppRecommendationEvent) -> Unit,
+        ) {
+            val tags =
+                arrayOf(
+                    arrayOf("alt", ALT),
+                )
+            signer.sign(createdAt, KIND, tags, "", onReady)
+        }
+    }
+}

quartz/src/main/java/com/vitorpamplona/quartz/events/NIP90StatusEvent.kt

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2024 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.quartz.events
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.encoders.HexKey
+import com.vitorpamplona.quartz.signers.NostrSigner
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+@Immutable
+class NIP90StatusEvent(
+    id: HexKey,
+    pubKey: HexKey,
+    createdAt: Long,
+    tags: Array<Array<String>>,
+    content: String,
+    sig: HexKey,
+) : Event(id, pubKey, createdAt, KIND, tags, content, sig) {
+    companion object {
+        const val KIND = 7000
+        const val ALT = "NIP90 Content Discovery reply"
+
+        fun create(
+            signer: NostrSigner,
+            createdAt: Long = TimeUtils.now(),
+            onReady: (AppRecommendationEvent) -> Unit,
+        ) {
+            val tags =
+                arrayOf(
+                    arrayOf("alt", ALT),
+                )
+            signer.sign(createdAt, KIND, tags, "", onReady)
+        }
+    }
+}