Adding support for Anigma's chat

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

@@ -2,6 +2,7 @@ package com.vitorpamplona.amethyst.model
 
 import androidx.lifecycle.LiveData
 import com.vitorpamplona.amethyst.service.Constants
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
 import com.vitorpamplona.amethyst.service.relays.Client
@@ -13,13 +14,21 @@ import nostr.postr.events.PrivateDmEvent
 import nostr.postr.events.TextNoteEvent
 import nostr.postr.toHex
 
-class Account(val loggedIn: Persona) {
+val DefaultChannels = setOf(
+  "25e5c82273a271cb1a840d0060391a0bf4965cafeb029d5ab55350b418953fbb" // -> Anigma's Nostr
+)
+
+class Account(val loggedIn: Persona, val followingChannels: MutableSet<String> = DefaultChannels.toMutableSet()) {
   var seeReplies: Boolean = true
 
   fun userProfile(): User {
     return LocalCache.getOrCreateUser(loggedIn.pubKey)
   }
 
+  fun followingChannels(): List<Channel> {
+    return followingChannels.map { LocalCache.getOrCreateChannel(it) }
+  }
+
   fun isWriteable(): Boolean {
     return loggedIn.privKey != null
   }
@@ -33,7 +42,7 @@ class Account(val loggedIn: Persona) {
     }
 
     note.event?.let {
-      val event = ReactionEvent.create(it, loggedIn.privKey!!)
+      val event = ReactionEvent.createLike(it, loggedIn.privKey!!)
       Client.send(event)
       LocalCache.consume(event)
     }
@@ -109,6 +118,18 @@ class Account(val loggedIn: Persona) {
     }
   }
 
+  fun sendChannelMeesage(message: String, toChannel: String, replyingTo: Note? = null) {
+    if (!isWriteable()) return
+
+    val signedEvent = ChannelMessageEvent.create(
+      message = message,
+      channel = toChannel,
+      privateKey = loggedIn.privKey!!
+    )
+    Client.send(signedEvent)
+    LocalCache.consume(signedEvent)
+  }
+
   fun sendPrivateMeesage(message: String, toUser: String, replyingTo: Note? = null) {
     if (!isWriteable()) return
     val user = LocalCache.users[toUser] ?: return

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

@@ -0,0 +1,58 @@
+package com.vitorpamplona.amethyst.model
+
+import androidx.lifecycle.LiveData
+import com.vitorpamplona.amethyst.service.NostrSingleUserDataSource
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.ui.note.toShortenHex
+import java.util.Collections
+import java.util.concurrent.ConcurrentHashMap
+import nostr.postr.events.ContactListEvent
+
+class Channel(val id: ByteArray) {
+    val idHex = id.toHexKey()
+    val idDisplayHex = id.toShortenHex()
+
+    var info = ChannelCreateEvent.ChannelData(null, null, null)
+
+    var updatedMetadataAt: Long = 0;
+
+    val notes = ConcurrentHashMap<HexKey, Note>()
+
+    @Synchronized
+    fun getOrCreateNote(idHex: String): Note {
+        return notes[idHex] ?: run {
+            val answer = Note(idHex)
+            notes.put(idHex, answer)
+            answer
+        }
+    }
+
+    fun updateChannelInfo(channelInfo: ChannelCreateEvent.ChannelData, updatedAt: Long) {
+        info = channelInfo
+        updatedMetadataAt = updatedAt
+
+        live.refresh()
+    }
+
+    fun profilePicture(): String {
+        if (info.picture.isNullOrBlank()) info.picture = null
+        return info.picture ?: "https://robohash.org/${idHex}.png"
+    }
+
+    // Observers line up here.
+    val live: ChannelLiveData = ChannelLiveData(this)
+
+    private fun refreshObservers() {
+        live.refresh()
+    }
+}
+
+
+class ChannelLiveData(val channel: Channel): LiveData<ChannelState>(ChannelState(channel)) {
+    fun refresh() {
+        postValue(ChannelState(channel))
+    }
+}
+
+class ChannelState(val channel: Channel)

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

@@ -4,6 +4,11 @@ import android.util.Log
 import androidx.lifecycle.LiveData
 import com.fasterxml.jackson.databind.DeserializationFeature
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.ChannelHideMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMuteUserEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
 import java.io.ByteArrayInputStream
@@ -28,6 +33,7 @@ object LocalCache {
 
   val users = ConcurrentHashMap<HexKey, User>()
   val notes = ConcurrentHashMap<HexKey, Note>()
+  val channels = ConcurrentHashMap<HexKey, Channel>()
 
   @Synchronized
   fun getOrCreateUser(pubkey: ByteArray): User {
@@ -48,6 +54,16 @@ object LocalCache {
     }
   }
 
+  @Synchronized
+  fun getOrCreateChannel(key: String): Channel {
+    return channels[key] ?: run {
+      val answer = Channel(key.toByteArray())
+      channels.put(key, answer)
+      answer
+    }
+  }
+
+
   fun consume(event: MetadataEvent) {
     //Log.d("MT", "New User ${users.size} ${event.contactMetaData.name}")
 
@@ -229,6 +245,73 @@ object LocalCache {
     }
   }
 
+  fun consume(event: ChannelCreateEvent) {
+    // new event
+    val oldChannel = getOrCreateChannel(event.id.toHex())
+    if (event.createdAt > oldChannel.updatedMetadataAt) {
+      oldChannel.updateChannelInfo(event.channelInfo, event.createdAt)
+    } else {
+      // older data, does nothing
+    }
+  }
+  fun consume(event: ChannelMetadataEvent) {
+    //Log.d("MT", "New User ${users.size} ${event.contactMetaData.name}")
+    if (event.channel.isNullOrBlank()) return
+
+    // new event
+    val oldChannel = getOrCreateChannel(event.channel)
+    if (event.createdAt > oldChannel.updatedMetadataAt) {
+      oldChannel.updateChannelInfo(event.channelInfo, event.createdAt)
+    } else {
+      //Log.d("MT","Relay sent a previous Metadata Event ${oldUser.toBestDisplayName()} ${formattedDateTime(event.createdAt)} > ${formattedDateTime(oldUser.updatedAt)}")
+    }
+  }
+
+  fun consume(event: ChannelMessageEvent) {
+    if (event.channel.isNullOrBlank()) return
+
+    val channel = getOrCreateChannel(event.channel)
+
+    val note = channel.getOrCreateNote(event.id.toHex())
+
+    // Already processed this event.
+    if (note.event != null) return
+
+    val author = getOrCreateUser(event.pubKey)
+    val mentions = Collections.synchronizedList(event.mentions.map { getOrCreateUser(decodePublicKey(it)) })
+    val replyTo = Collections.synchronizedList(event.replyTos.map { getOrCreateNote(it) }.toMutableList())
+
+    note.channel = channel
+    note.loadEvent(event, author, mentions, replyTo)
+
+    //Log.d("CM", "New Note (${notes.size},${users.size}) ${note.author?.toBestDisplayName()} ${note.event?.content} ${formattedDateTime(event.createdAt)}")
+
+    // Adds notifications to users.
+    mentions.forEach {
+      it.taggedPosts.add(note)
+    }
+    replyTo.forEach {
+      it.author?.taggedPosts?.add(note)
+    }
+
+    // Counts the replies
+    replyTo.forEach {
+      it.addReply(note)
+    }
+
+    UrlCachedPreviewer.preloadPreviewsFor(note)
+
+    refreshObservers()
+  }
+
+  fun consume(event: ChannelHideMessageEvent) {
+
+  }
+
+  fun consume(event: ChannelMuteUserEvent) {
+
+  }
+
   // Observers line up here.
   val live: LocalCacheLiveData = LocalCacheLiveData(this)
 

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

@@ -32,6 +32,8 @@ class Note(val idHex: String) {
     val reactions = Collections.synchronizedSet(mutableSetOf<Note>())
     val boosts = Collections.synchronizedSet(mutableSetOf<Note>())
 
+    var channel: Channel? = null
+
     fun loadEvent(event: Event, author: User, mentions: List<User>, replyTo: MutableList<Note>) {
         this.event = event
         this.author = author

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

@@ -6,7 +6,7 @@ object Constants {
     val defaultRelays = arrayOf(
       Relay("wss://nostr.bitcoiner.social", read = true, write = true),
       Relay("wss://relay.nostr.bg", read = true, write = true),
-      //Relay("wss://brb.io", read = true, write = true),
+      Relay("wss://brb.io", read = true, write = true),
       Relay("wss://nostr.v0l.io", read = true, write = true),
       Relay("wss://nostr.rocks", read = true, write = true),
       Relay("wss://relay.damus.io", read = true, write = true),
@@ -17,8 +17,9 @@ object Constants {
       Relay("wss://nostr-pub.wellorder.net", read = true, write = true),
       Relay("wss://nostr.mom", read = true, write = true),
       Relay("wss://nostr.orangepill.dev", read = true, write = true),
-      //Relay("wss://nostr-pub.semisol.dev", read = true, write = true),
+      Relay("wss://nostr-pub.semisol.dev", read = true, write = true),
       Relay("wss://nostr.onsats.org", read = true, write = true),
-      Relay("wss://nostr.sandwich.farm", read = true, write = true)
+      Relay("wss://nostr.sandwich.farm", read = true, write = true),
+      Relay("wss://relay.nostr.ch", read = true, write = true)
     )
 }

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

@@ -0,0 +1,31 @@
+package com.vitorpamplona.amethyst.service
+
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import nostr.postr.JsonFilter
+
+object NostrChannelDataSource: NostrDataSource<Note>("ChatroomFeed") {
+  var channel: com.vitorpamplona.amethyst.model.Channel? = null
+
+  fun loadMessagesBetween(channelId: String) {
+    channel = LocalCache.channels[channelId]
+  }
+
+  fun createMessagesToChannelFilter() = JsonFilter(
+    kinds = listOf(ChannelMessageEvent.kind),
+    tags = mapOf("e" to listOf(channel?.idHex).filterNotNull()),
+    since = System.currentTimeMillis() / 1000 - (60 * 60 * 24 * 1), // 24 hours
+  )
+
+  val messagesChannel = requestNewChannel()
+
+  // returns the last Note of each user.
+  override fun feed(): List<Note> {
+    return channel?.notes?.values?.sortedBy { it.event!!.createdAt } ?: emptyList()
+  }
+
+  override fun updateChannelFilters() {
+    messagesChannel.filter = createMessagesToChannelFilter()
+  }
+}

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

@@ -2,6 +2,9 @@ package com.vitorpamplona.amethyst.service
 
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
 import nostr.postr.JsonFilter
 import nostr.postr.events.PrivateDmEvent
 
@@ -18,21 +21,50 @@ object NostrChatroomListDataSource: NostrDataSource<Note>("MailBoxFeed") {
     authors = listOf(account.userProfile().pubkeyHex)
   )
 
+  fun createMyChannelsFilter() = JsonFilter(
+    kinds = listOf(ChannelCreateEvent.kind),
+    ids = account.followingChannels.toList()
+  )
+
+  fun createMyChannelsInfoFilter() = JsonFilter(
+    kinds = listOf(ChannelMetadataEvent.kind),
+    tags = mapOf("e" to account.followingChannels.toList())
+  )
+
+  fun createMessagesToMyChannelsFilter() = JsonFilter(
+    kinds = listOf(ChannelMessageEvent.kind),
+    tags = mapOf("e" to account.followingChannels.toList()),
+    since = System.currentTimeMillis() / 1000 - (60 * 60 * 24 * 1), // 24 hours
+  )
+
   val incomingChannel = requestNewChannel()
   val outgoingChannel = requestNewChannel()
 
+  val myChannelsChannel = requestNewChannel()
+  val myChannelsInfoChannel = requestNewChannel()
+  val myChannelsMessagesChannel = requestNewChannel()
+
   // returns the last Note of each user.
   override fun feed(): List<Note> {
     val messages = account.userProfile().messages
     val messagingWith = messages.keys().toList()
 
-    return messagingWith.mapNotNull {
+    val privateMessages = messagingWith.mapNotNull {
       messages[it]?.sortedBy { it.event?.createdAt }?.last { it.event != null }
-    }.sortedBy { it.event?.createdAt }.reversed()
+    }
+
+    val publicChannels = account.followingChannels().map {
+      it.notes.values.sortedBy { it.event?.createdAt }.last { it.event != null }
+    }
+
+    return (privateMessages + publicChannels).sortedBy { it.event?.createdAt }.reversed()
   }
 
   override fun updateChannelFilters() {
     incomingChannel.filter = createMessagesToMeFilter()
     outgoingChannel.filter = createMessagesFromMeFilter()
+    myChannelsChannel.filter = createMyChannelsFilter()
+    myChannelsInfoChannel.filter = createMyChannelsInfoFilter()
+    myChannelsMessagesChannel.filter = createMessagesToMyChannelsFilter()
   }
 }

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

@@ -1,6 +1,11 @@
 package com.vitorpamplona.amethyst.service
 
 import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.ChannelHideMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMuteUserEvent
 import com.vitorpamplona.amethyst.service.model.ReactionEvent
 import com.vitorpamplona.amethyst.service.model.RepostEvent
 import com.vitorpamplona.amethyst.service.relays.Client
@@ -33,6 +38,12 @@ abstract class NostrDataSource<T>(val debugName: String) {
           else -> when (event.kind) {
             RepostEvent.kind -> LocalCache.consume(RepostEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
             ReactionEvent.kind -> LocalCache.consume(ReactionEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+
+            ChannelCreateEvent.kind -> LocalCache.consume(ChannelCreateEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+            ChannelMetadataEvent.kind -> LocalCache.consume(ChannelMetadataEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+            ChannelMessageEvent.kind -> LocalCache.consume(ChannelMessageEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+            ChannelHideMessageEvent.kind -> LocalCache.consume(ChannelHideMessageEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
+            ChannelMuteUserEvent.kind -> LocalCache.consume(ChannelMuteUserEvent(event.id, event.pubKey, event.createdAt, event.tags, event.content, event.sig))
           }
         }
       }

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelCreateEvent.kt

@@ -0,0 +1,44 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.Utils
+import nostr.postr.events.Event
+import nostr.postr.events.MetadataEvent
+
+class ChannelCreateEvent (
+  id: ByteArray,
+  pubKey: ByteArray,
+  createdAt: Long,
+  tags: List<List<String>>,
+  content: String,
+  sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+  @Transient val channelInfo: ChannelData
+
+  init {
+    try {
+      channelInfo = MetadataEvent.gson.fromJson(content, ChannelData::class.java)
+    } catch (e: Exception) {
+      throw Error("can't parse $content", e)
+    }
+  }
+
+  companion object {
+    const val kind = 40
+
+    fun create(channelInfo: ChannelData?, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ChannelCreateEvent {
+      val content = if (channelInfo != null)
+        gson.toJson(channelInfo)
+      else
+        ""
+
+      val pubKey = Utils.pubkeyCreate(privateKey)
+      val tags = emptyList<List<String>>()
+      val id = generateId(pubKey, createdAt, kind, tags, content)
+      val sig = Utils.sign(id, privateKey)
+      return ChannelCreateEvent(id, pubKey, createdAt, tags, content, sig)
+    }
+  }
+
+  data class ChannelData(var name: String?, var about: String?, var picture: String?)
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelHideMessageEvent.kt

@@ -0,0 +1,38 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.Utils
+import nostr.postr.events.Event
+import nostr.postr.toHex
+
+class ChannelHideMessageEvent (
+  id: ByteArray,
+  pubKey: ByteArray,
+  createdAt: Long,
+  tags: List<List<String>>,
+  content: String,
+  sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+  @Transient val eventsToHide: List<String>
+
+  init {
+    eventsToHide = tags.filter { it.firstOrNull() == "e" }.mapNotNull { it.getOrNull(1) }
+  }
+
+  companion object {
+    const val kind = 43
+
+    fun create(reason: String, messagesToHide: List<String>?, mentions: List<String>?, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ChannelHideMessageEvent {
+      val content = reason
+      val pubKey = Utils.pubkeyCreate(privateKey)
+      val tags =
+        messagesToHide?.map {
+          listOf("e", it)
+        } ?: emptyList()
+
+      val id = generateId(pubKey, createdAt, kind, tags, content)
+      val sig = Utils.sign(id, privateKey)
+      return ChannelHideMessageEvent(id, pubKey, createdAt, tags, content, sig)
+    }
+  }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMessageEvent.kt

@@ -0,0 +1,47 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.Utils
+import nostr.postr.events.Event
+import nostr.postr.toHex
+
+class ChannelMessageEvent (
+  id: ByteArray,
+  pubKey: ByteArray,
+  createdAt: Long,
+  tags: List<List<String>>,
+  content: String,
+  sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+  @Transient val channel: String?
+  @Transient val replyTos: List<String>
+  @Transient val mentions: List<String>
+
+  init {
+    channel = tags.firstOrNull { it[0] == "e" && it.size > 3 && it[3] == "root" }?.getOrNull(1) ?: tags.firstOrNull { it.firstOrNull() == "e" }?.getOrNull(1)
+    replyTos = tags.filter { it.firstOrNull() == "e" && (it.size < 3 || (it.size > 3 && it[3] != "root")) }.mapNotNull { it.getOrNull(1) }
+    mentions = tags.filter { it.firstOrNull() == "p" }.mapNotNull { it.getOrNull(1) }
+  }
+
+  companion object {
+    const val kind = 42
+
+    fun create(message: String, channel: String, replyTos: List<String>? = null, mentions: List<String>? = null, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ChannelMessageEvent {
+      val content = message
+      val pubKey = Utils.pubkeyCreate(privateKey)
+      val tags = mutableListOf(
+        listOf("e", channel, "", "root")
+      )
+      replyTos?.forEach {
+        tags.add(listOf("e", it))
+      }
+      mentions?.forEach {
+        tags.add(listOf("p", it))
+      }
+
+      val id = generateId(pubKey, createdAt, kind, tags, content)
+      val sig = Utils.sign(id, privateKey)
+      return ChannelMessageEvent(id, pubKey, createdAt, tags, content, sig)
+    }
+  }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMetadataEvent.kt

@@ -0,0 +1,46 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.ContactMetaData
+import nostr.postr.Utils
+import nostr.postr.events.Event
+import nostr.postr.events.MetadataEvent
+import nostr.postr.toHex
+
+class ChannelMetadataEvent (
+  id: ByteArray,
+  pubKey: ByteArray,
+  createdAt: Long,
+  tags: List<List<String>>,
+  content: String,
+  sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+  @Transient val channel: String?
+  @Transient val channelInfo: ChannelCreateEvent.ChannelData
+
+  init {
+    channel = tags.firstOrNull { it.firstOrNull() == "e" }?.getOrNull(1)
+    try {
+      channelInfo = MetadataEvent.gson.fromJson(content, ChannelCreateEvent.ChannelData::class.java)
+    } catch (e: Exception) {
+      throw Error("can't parse $content", e)
+    }
+  }
+
+  companion object {
+    const val kind = 41
+
+    fun create(newChannelInfo: ChannelCreateEvent.ChannelData?, originalChannel: ChannelCreateEvent, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ChannelMetadataEvent {
+      val content = if (newChannelInfo != null)
+        gson.toJson(newChannelInfo)
+      else
+        ""
+
+      val pubKey = Utils.pubkeyCreate(privateKey)
+      val tags = listOf( listOf("e", originalChannel.id.toHex(), "", "root") )
+      val id = generateId(pubKey, createdAt, kind, tags, content)
+      val sig = Utils.sign(id, privateKey)
+      return ChannelMetadataEvent(id, pubKey, createdAt, tags, content, sig)
+    }
+  }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMuteUserEvent.kt

@@ -0,0 +1,39 @@
+package com.vitorpamplona.amethyst.service.model
+
+import java.util.Date
+import nostr.postr.Utils
+import nostr.postr.events.Event
+import nostr.postr.events.MetadataEvent
+import nostr.postr.toHex
+
+class ChannelMuteUserEvent (
+  id: ByteArray,
+  pubKey: ByteArray,
+  createdAt: Long,
+  tags: List<List<String>>,
+  content: String,
+  sig: ByteArray
+): Event(id, pubKey, createdAt, kind, tags, content, sig) {
+  @Transient val usersToMute: List<String>
+
+  init {
+    usersToMute = tags.filter { it.firstOrNull() == "p" }.mapNotNull { it.getOrNull(1) }
+  }
+
+  companion object {
+    const val kind = 43
+
+    fun create(reason: String, usersToMute: List<String>?, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ChannelMuteUserEvent {
+      val content = reason
+      val pubKey = Utils.pubkeyCreate(privateKey)
+      val tags =
+        usersToMute?.map {
+          listOf("p", it)
+        } ?: emptyList()
+
+      val id = generateId(pubKey, createdAt, kind, tags, content)
+      val sig = Utils.sign(id, privateKey)
+      return ChannelMuteUserEvent(id, pubKey, createdAt, tags, content, sig)
+    }
+  }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ReactionEvent.kt

@@ -25,8 +25,11 @@ class ReactionEvent (
   companion object {
     const val kind = 7
 
-    fun create(originalNote: Event, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ReactionEvent {
-      val content = "+"
+    fun createLike(originalNote: Event, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ReactionEvent {
+      return create("+", originalNote, privateKey, createdAt)
+    }
+
+    fun create(content: String, originalNote: Event, privateKey: ByteArray, createdAt: Long = Date().time / 1000): ReactionEvent {
       val pubKey = Utils.pubkeyCreate(privateKey)
       val tags = listOf( listOf("e", originalNote.id.toHex()), listOf("p", originalNote.pubKey.toHex()))
       val id = generateId(pubKey, createdAt, kind, tags, content)

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/Routes.kt

@@ -10,6 +10,7 @@ import androidx.navigation.NavType
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.navArgument
 import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.ui.screen.ChannelScreen
 import com.vitorpamplona.amethyst.ui.screen.ChatroomListScreen
 import com.vitorpamplona.amethyst.ui.screen.ChatroomScreen
 import com.vitorpamplona.amethyst.ui.screen.HomeScreen
@@ -45,6 +46,11 @@ sealed class Route(
         arguments = listOf(navArgument("id") { type = NavType.StringType } ),
         buildScreen = { acc, nav -> { ChatroomScreen(it.arguments?.getString("id"), acc, nav) }}
     )
+
+    object Channel : Route("Channel/{id}", R.drawable.ic_moments,
+        arguments = listOf(navArgument("id") { type = NavType.StringType } ),
+        buildScreen = { acc, nav -> { ChannelScreen(it.arguments?.getString("id"), acc, nav) }}
+    )
 }
 
 val Routes = listOf(
@@ -57,7 +63,8 @@ val Routes = listOf(
     //drawer
     Route.Profile,
     Route.Note,
-    Route.Room
+    Route.Room,
+    Route.Channel
 )
 
 @Composable

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

@@ -16,12 +16,14 @@ import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
 import coil.compose.AsyncImage
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.ui.components.RichTextViewer
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import nostr.postr.events.TextNoteEvent
 
 @Composable
 fun ChatroomCompose(baseNote: Note, accountViewModel: AccountViewModel, navController: NavController) {
@@ -33,6 +35,61 @@ fun ChatroomCompose(baseNote: Note, accountViewModel: AccountViewModel, navContr
 
     if (note?.event == null) {
         BlankNote(Modifier)
+    } else if (note.channel != null) {
+        val authorState by note.author!!.live.observeAsState()
+        val author = authorState?.user
+
+        val channelState by note.channel!!.live.observeAsState()
+        val channel = channelState?.channel
+
+        Column(modifier =
+        Modifier.clickable(
+            onClick = { navController.navigate("Channel/${channel?.idHex}") }
+        )
+        ) {
+            Row(
+                modifier = Modifier
+                    .padding(
+                        start = 12.dp,
+                        end = 12.dp,
+                        top = 10.dp)
+            ) {
+
+                AsyncImage(
+                    model = channel?.profilePicture(),
+                    contentDescription = "Public Channel Image",
+                    modifier = Modifier
+                        .width(55.dp).height(55.dp)
+                        .clip(shape = CircleShape)
+                )
+
+                Column(modifier = Modifier.padding(start = 10.dp)) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Text(
+                            "${channel?.info?.name}",
+                            fontWeight = FontWeight.Bold,
+                        )
+
+                        Text(
+                            timeAgo(note.event?.createdAt),
+                            color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
+                        )
+                    }
+
+                    val eventContent = accountViewModel.decrypt(note)
+                    if (eventContent != null)
+                        RichTextViewer("${author?.toBestDisplayName()}: " + eventContent.take(100), note.event?.tags, note, accountViewModel, navController)
+                    else
+                        RichTextViewer("Referenced event not found", note.event?.tags, note, accountViewModel, navController)
+                }
+            }
+
+            Divider(
+                modifier = Modifier.padding(top = 10.dp),
+                thickness = 0.25.dp
+            )
+        }
+
     } else {
         val authorState by note.author!!.live.observeAsState()
         val author = authorState?.user
@@ -96,4 +153,5 @@ fun ChatroomCompose(baseNote: Note, accountViewModel: AccountViewModel, navContr
             )
         }
     }
+
 }

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

@@ -1,10 +1,18 @@
 package com.vitorpamplona.amethyst.ui.note
 
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.layout.wrapContentWidth
+import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
@@ -12,19 +20,27 @@ import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
+import coil.compose.AsyncImage
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
 import com.vitorpamplona.amethyst.ui.components.RichTextViewer
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 
 val ChatBubbleShapeMe = RoundedCornerShape(20.dp, 20.dp, 3.dp, 20.dp)
 val ChatBubbleShapeThem = RoundedCornerShape(20.dp, 20.dp, 20.dp, 3.dp)
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
 fun ChatroomMessageCompose(baseNote: Note, accountViewModel: AccountViewModel, navController: NavController) {
     val noteState by baseNote.live.observeAsState()
@@ -33,6 +49,8 @@ fun ChatroomMessageCompose(baseNote: Note, accountViewModel: AccountViewModel, n
     val accountUserState by accountViewModel.userLiveData.observeAsState()
     val accountUser = accountUserState?.user
 
+    var popupExpanded by remember { mutableStateOf(false) }
+
     if (note?.event == null) {
         BlankNote(Modifier)
     } else {
@@ -60,7 +78,12 @@ fun ChatroomMessageCompose(baseNote: Note, accountViewModel: AccountViewModel, n
                     .padding(
                         start = 12.dp,
                         end = 12.dp,
-                        top = 10.dp)
+                        top = 5.dp,
+                        bottom = 5.dp
+                    ).combinedClickable(
+                        onClick = {  },
+                        onLongClick = { popupExpanded = true }
+                    )
             ) {
 
                 Row(
@@ -73,6 +96,37 @@ fun ChatroomMessageCompose(baseNote: Note, accountViewModel: AccountViewModel, n
                         Column(
                             modifier = Modifier.padding(10.dp),
                         ) {
+
+                            if (author != accountUser && note.event is ChannelMessageEvent) {
+                                Row(
+                                    verticalAlignment = Alignment.CenterVertically,
+                                    horizontalArrangement = alignment
+                                ) {
+                                    AsyncImage(
+                                        model = author?.profilePicture(),
+                                        contentDescription = "Profile Image",
+                                        modifier = Modifier
+                                            .width(25.dp).height(25.dp)
+                                            .clip(shape = CircleShape)
+                                            .clickable(onClick = {
+                                                author?.let {
+                                                    navController.navigate("User/${it.pubkeyHex}")
+                                                }
+                                            })
+                                    )
+
+                                    Text(
+                                        "  ${author?.toBestDisplayName()}",
+                                        fontWeight = FontWeight.Bold,
+                                        modifier = Modifier.clickable(onClick = {
+                                                author?.let {
+                                                    navController.navigate("User/${it.pubkeyHex}")
+                                                }
+                                            })
+                                    )
+                                }
+                            }
+
                             Row(
                                 verticalAlignment = Alignment.CenterVertically
                             ) {
@@ -110,6 +164,8 @@ fun ChatroomMessageCompose(baseNote: Note, accountViewModel: AccountViewModel, n
                     }
                 }
             }
+
+            NoteDropDownMenu(note, popupExpanded, { popupExpanded = false }, accountViewModel)
         }
     }
 }

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

@@ -3,6 +3,7 @@ package com.vitorpamplona.amethyst.ui.screen
 import androidx.lifecycle.ViewModel
 import androidx.security.crypto.EncryptedSharedPreferences
 import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.DefaultChannels
 import com.vitorpamplona.amethyst.model.toByteArray
 import com.vitorpamplona.amethyst.service.NostrAccountDataSource
 import com.vitorpamplona.amethyst.service.NostrChatroomListDataSource
@@ -27,41 +28,47 @@ class AccountStateViewModel(private val encryptedPreferences: EncryptedSharedPre
 
   init {
     // pulls account from storage.
-    loadFromEncryptedStorage()?.let { login(it) }
+    loadFromEncryptedStorage()?.let {
+      login(it)
+    }
   }
 
   fun login(key: String) {
     val pattern = Pattern.compile(".+@.+\\.[a-z]+")
 
-    login(
+    val account =
       if (key.startsWith("nsec")) {
-        Persona(privKey = key.bechToBytes())
+        Account(Persona(privKey = key.bechToBytes()))
       } else if (key.startsWith("npub")) {
-        Persona(pubKey = key.bechToBytes())
+        Account(Persona(pubKey = key.bechToBytes()))
       } else if (pattern.matcher(key).matches()) {
         // Evaluate NIP-5
-        Persona()
+        Account(Persona())
       } else {
-        Persona(Hex.decode(key))
+        Account(Persona(Hex.decode(key)))
       }
-    )
 
+    saveToEncryptedStorage(account)
+
+    login(account)
   }
 
-  fun login(person: Persona) {
-    val loggedIn = Account(person)
+  fun newKey() {
+    val account = Account(Persona())
+    saveToEncryptedStorage(account)
+    login(account)
+  }
 
-    if (person.privKey != null)
-      _accountContent.update { AccountState.LoggedIn ( loggedIn ) }
+  fun login(account: Account) {
+    if (account.loggedIn.privKey != null)
+      _accountContent.update { AccountState.LoggedIn ( account ) }
     else
-      _accountContent.update { AccountState.LoggedInViewOnly ( Account(person) ) }
+      _accountContent.update { AccountState.LoggedInViewOnly ( account ) }
 
-    saveToEncryptedStorage(person)
-
-    NostrAccountDataSource.account = loggedIn
-    NostrHomeDataSource.account = loggedIn
-    NostrNotificationDataSource.account = loggedIn
-    NostrChatroomListDataSource.account = loggedIn
+    NostrAccountDataSource.account = account
+    NostrHomeDataSource.account = account
+    NostrNotificationDataSource.account = account
+    NostrChatroomListDataSource.account = account
 
     NostrAccountDataSource.start()
     NostrGlobalDataSource.start()
@@ -73,10 +80,6 @@ class AccountStateViewModel(private val encryptedPreferences: EncryptedSharedPre
     NostrChatroomListDataSource.start()
   }
 
-  fun newKey() {
-    login(Persona())
-  }
-
   fun logOff() {
     _accountContent.update { AccountState.LoggedOff }
 
@@ -90,20 +93,22 @@ class AccountStateViewModel(private val encryptedPreferences: EncryptedSharedPre
     }.apply()
   }
 
-  fun saveToEncryptedStorage(login: Persona) {
+  fun saveToEncryptedStorage(account: Account) {
     encryptedPreferences.edit().apply {
-      login.privKey?.let { putString("nostr_privkey", it.toHex()) }
-      login.pubKey.let { putString("nostr_pubkey", it.toHex()) }
+      account.loggedIn.privKey?.let { putString("nostr_privkey", it.toHex()) }
+      account.loggedIn.pubKey.let { putString("nostr_pubkey", it.toHex()) }
+      account.followingChannels.let { putStringSet("following_channels", account.followingChannels) }
     }.apply()
   }
 
-  fun loadFromEncryptedStorage(): Persona? {
+  fun loadFromEncryptedStorage(): Account? {
     encryptedPreferences.apply {
       val privKey = getString("nostr_privkey", null)
       val pubKey = getString("nostr_pubkey", null)
+      val followingChannels = getStringSet("following_channels", DefaultChannels)?.toMutableSet() ?: DefaultChannels.toMutableSet()
 
       if (pubKey != null) {
-        return Persona(privKey = privKey?.toByteArray(), pubKey = pubKey.toByteArray())
+        return Account(Persona(privKey = privKey?.toByteArray(), pubKey = pubKey.toByteArray()), followingChannels)
       } else {
         return null
       }

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

@@ -21,7 +21,7 @@ import com.vitorpamplona.amethyst.ui.note.ChatroomMessageCompose
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 
 @Composable
-fun ChatroomFeedView(userId: String, viewModel: FeedViewModel, accountViewModel: AccountViewModel, navController: NavController) {
+fun ChatroomFeedView(viewModel: FeedViewModel, accountViewModel: AccountViewModel, navController: NavController) {
     val feedState by viewModel.feedContent.collectAsStateWithLifecycle()
 
     var isRefreshing by remember { mutableStateOf(false) }

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

@@ -0,0 +1,145 @@
+package com.vitorpamplona.amethyst.ui.screen
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.Divider
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.OutlinedTextField
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.KeyboardCapitalization
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import androidx.navigation.NavController
+import coil.compose.AsyncImage
+import com.vitorpamplona.amethyst.model.Channel
+import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.service.NostrChannelDataSource
+import com.vitorpamplona.amethyst.service.NostrChatRoomDataSource
+import com.vitorpamplona.amethyst.ui.actions.PostButton
+import com.vitorpamplona.amethyst.ui.note.UserDisplay
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+
+@Composable
+fun ChannelScreen(channelId: String?, accountViewModel: AccountViewModel, navController: NavController) {
+    val accountState by accountViewModel.accountLiveData.observeAsState()
+    val account = accountState?.account
+
+    if (account != null && channelId != null) {
+        val newPost = remember { mutableStateOf(TextFieldValue("")) }
+
+        NostrChannelDataSource.loadMessagesBetween(channelId)
+
+        val channelState by NostrChannelDataSource.channel!!.live.observeAsState()
+        val channel = channelState?.channel ?: return
+
+        val feedViewModel: FeedViewModel = viewModel { FeedViewModel( NostrChannelDataSource ) }
+
+        Column(Modifier.fillMaxHeight()) {
+            channel?.let {
+                ChannelHeader(
+                    it,
+                    accountViewModel = accountViewModel,
+                    navController = navController
+                )
+            }
+
+            Column(
+                modifier = Modifier.fillMaxHeight().padding(vertical = 0.dp).weight(1f, true)
+            ) {
+                ChatroomFeedView(feedViewModel, accountViewModel, navController)
+            }
+
+            //LAST ROW
+            Row(modifier = Modifier.padding(10.dp).fillMaxWidth(),
+                horizontalArrangement = Arrangement.SpaceBetween,
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                OutlinedTextField(
+                    value = newPost.value,
+                    onValueChange = { newPost.value = it },
+                    keyboardOptions = KeyboardOptions.Default.copy(
+                        capitalization = KeyboardCapitalization.Sentences
+                    ),
+                    modifier = Modifier.weight(1f, true).padding(end = 10.dp),
+                    placeholder = {
+                        Text(
+                            text = "reply here.. ",
+                            color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
+                        )
+                    }
+                )
+
+                PostButton(
+                    onPost = {
+                        account.sendChannelMeesage(newPost.value.text, channel.idHex)
+                        newPost.value = TextFieldValue("")
+                    },
+                    newPost.value.text.isNotBlank()
+                )
+            }
+        }
+    }
+}
+
+
+@Composable
+fun ChannelHeader(baseChannel: Channel, accountViewModel: AccountViewModel, navController: NavController) {
+    val channelState by baseChannel.live.observeAsState()
+    val channel = channelState?.channel
+
+    Column(modifier =
+        Modifier
+            .padding(12.dp)
+    ) {
+        Row(verticalAlignment = Alignment.CenterVertically) {
+
+            AsyncImage(
+                model = channel?.profilePicture(),
+                contentDescription = "Profile Image",
+                modifier = Modifier
+                    .width(35.dp).height(35.dp)
+                    .clip(shape = CircleShape)
+            )
+
+            Column(modifier = Modifier.padding(start = 10.dp)) {
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text(
+                        "${channel?.info?.name}",
+                        fontWeight = FontWeight.Bold,
+                    )
+                }
+
+                Row(verticalAlignment = Alignment.CenterVertically) {
+                    Text(
+                        "${channel?.info?.about}",
+                        color = MaterialTheme.colors.onSurface.copy(alpha = 0.32f)
+                    )
+                }
+            }
+        }
+
+        Divider(
+            modifier = Modifier.padding(top = 12.dp, start = 12.dp, end = 12.dp),
+            thickness = 0.25.dp
+        )
+    }
+}

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

@@ -59,7 +59,7 @@ fun ChatroomScreen(userId: String?, accountViewModel: AccountViewModel, navContr
             Column(
                 modifier = Modifier.fillMaxHeight().padding(vertical = 0.dp).weight(1f, true)
             ) {
-                ChatroomFeedView(userId, feedViewModel, accountViewModel, navController)
+                ChatroomFeedView(feedViewModel, accountViewModel, navController)
             }
 
             //LAST ROW