composeApp/build.gradle.kts

@@ -27,6 +27,7 @@ kotlin {
             implementation("io.coil-kt.coil3:coil-network-okhttp:3.4.0")
             implementation("su.reya:nostr-sdk-kmp:0.2.3")
             implementation("io.github.kalinjul.easyqrscan:scanner:0.7.0")
+            implementation("androidx.lifecycle:lifecycle-process:2.8.0")
         }
         commonMain.dependencies {
             implementation(libs.compose.runtime)

composeApp/src/androidMain/AndroidManifest.xml

@@ -7,6 +7,9 @@
         android:required="false" />
 
     <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 
     <application
         android:allowBackup="true"
@@ -23,6 +26,11 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <service
+            android:name=".NostrForegroundService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="dataSync" />
     </application>
 
 </manifest>

composeApp/src/androidMain/kotlin/su/reya/coop/App.kt

@@ -45,7 +45,7 @@ val LocalNavController = staticCompositionLocalOf<NavController> {
 
 @OptIn(ExperimentalMaterial3ExpressiveApi::class)
 @Composable
-fun App(dbPath: String) {
+fun App() {
     val context = LocalContext.current
     val navController = rememberNavController()
     val darkMode = isSystemInDarkTheme()
@@ -53,11 +53,10 @@ fun App(dbPath: String) {
     // Snackbar
     val snackbarHostState = remember { SnackbarHostState() }
 
-    // Initialize Nostr and SecretStore
+    // Initialize Nostr View Model and Secret Store
-    val nostr = remember { Nostr() }
     val secretStore = remember { SecretStore(context) }
-    val viewModel: NostrViewModel = viewModel { NostrViewModel(nostr, secretStore) }
+    val viewModel: NostrViewModel = viewModel { NostrViewModel(NostrManager.instance, secretStore) }
-    
+
     // Enabled the dynamic color scheme
     val colorScheme = when {
         android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S -> {
@@ -69,7 +68,7 @@ fun App(dbPath: String) {
     }
 
     LaunchedEffect(Unit) {
-        viewModel.initAndConnect(dbPath)
+        viewModel.login()
         viewModel.startNotificationHandler()
         viewModel.getChatRooms()
 

composeApp/src/androidMain/kotlin/su/reya/coop/MainActivity.kt

@@ -1,22 +1,27 @@
 package su.reya.coop
 
+import android.content.Intent
+import android.os.Build
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import java.io.File
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
-        // Get database directory
+        val intent = Intent(this, NostrForegroundService::class.java)
-        val dbDir = File(filesDir, "nostr")
+
-        dbDir.mkdirs()
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            startForegroundService(intent)
+        } else {
+            startService(intent)
+        }
 
         setContent {
-            App(dbDir.absolutePath)
+            App()
         }
     }
 }

composeApp/src/androidMain/kotlin/su/reya/coop/NostrForegroundService.kt

@@ -0,0 +1,93 @@
+package su.reya.coop
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.Service
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import androidx.annotation.RequiresApi
+import androidx.core.app.NotificationCompat
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ProcessLifecycleOwner
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.launch
+import java.io.File
+
+class NostrForegroundService : Service() {
+    private val serviceScope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+    private val nostr = NostrManager.instance
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    private fun isUserInApp(): Boolean {
+        return ProcessLifecycleOwner.get().lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)
+    }
+
+    @RequiresApi(Build.VERSION_CODES.O)
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        createNotificationChannel()
+        val notification = createNotification("Connecting to Nostr...")
+        startForeground(1, notification)
+
+        serviceScope.launch {
+            try {
+                val dbDir = File(filesDir, "nostr")
+                dbDir.mkdirs()
+
+                // Initialize Nostr client
+                nostr.init(dbDir.absolutePath)
+
+                // Handle notifications
+                nostr.handleLiteNotifications { event ->
+                    if (!isUserInApp()) {
+                        showNewMessageNotification(event.content())
+                    }
+                }
+            } catch (e: Exception) {
+                println("Failed to start Nostr in background: ${e.message}")
+            }
+        }
+
+        return START_STICKY
+    }
+
+    @RequiresApi(Build.VERSION_CODES.O)
+    private fun createNotificationChannel() {
+        val channel = NotificationChannel(
+            "nostr_service",
+            "Nostr Background Service",
+            NotificationManager.IMPORTANCE_HIGH
+        )
+        val manager = getSystemService(NotificationManager::class.java)
+        manager?.createNotificationChannel(channel)
+    }
+
+    private fun createNotification(content: String): Notification {
+        return NotificationCompat.Builder(this, "nostr_service")
+            .setContentTitle("Coop")
+            .setContentText(content)
+            .setSmallIcon(android.R.drawable.ic_menu_send)
+            .setOngoing(true)
+            .build()
+    }
+
+    private fun showNewMessageNotification(message: String) {
+        val notification = NotificationCompat.Builder(this, "nostr_service")
+            .setContentTitle("New Message")
+            .setContentText(message)
+            .setAutoCancel(true)
+            .build()
+        val manager = getSystemService(NotificationManager::class.java)
+        manager?.notify(System.currentTimeMillis().toInt(), notification)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        serviceScope.cancel()
+    }
+}

shared/src/commonMain/kotlin/su/reya/coop/Nostr.kt

@@ -52,7 +52,12 @@ import rust.nostr.sdk.initLogger
 import rust.nostr.sdk.nip17ExtractRelayList
 import kotlin.time.Duration
 
+object NostrManager {
+    val instance = Nostr()
+}
+
 class Nostr {
+    private var isInitialized = false
     var client: Client? = null
         private set
     var signer: UniversalSigner = UniversalSigner(Keys.generate())
@@ -64,6 +69,8 @@ class Nostr {
 
     suspend fun init(dbPath: String) {
         try {
+            if (isInitialized) return
+
             // Initialize the logger for nostr client
             initLogger(LogLevel.DEBUG)
 
@@ -105,6 +112,8 @@ class Nostr {
 
             // Connect to all bootstrap relays and wait for all connections to be established
             client?.connect(Duration.parse("3s"))
+
+            isInitialized = true
         } catch (e: Exception) {
             throw IllegalStateException("Failed to initialize Nostr client: ${e.message}", e)
         }
@@ -119,9 +128,9 @@ class Nostr {
         deviceSigner = null
     }
 
-    suspend fun setSigner(keys: AsyncNostrSigner) {
+    suspend fun setSigner(new: AsyncNostrSigner) {
         try {
-            signer.switch(keys)
+            signer.switch(new)
             // Fetch metadata for current user
             getUserMetadata()
         } catch (e: Exception) {
@@ -184,18 +193,69 @@ class Nostr {
 
             client?.subscribe(
                 target = ReqTarget.manual(target),
-                id = "messages"
+                id = "all-gift-wraps"
             )
         } catch (e: Exception) {
             throw IllegalStateException("Failed to fetch user messages: ${e.message}", e)
         }
     }
 
+    suspend fun handleLiteNotifications(
+        onNewMessage: (UnsignedEvent) -> Unit,
+    ) {
+        val now = Timestamp.now()
+        val processedEvent = mutableSetOf<EventId>()
+        val notifications = client?.notifications() ?: return
+
+        while (true) {
+            val notification = notifications.next() ?: continue
+
+            when (notification) {
+                is ClientNotification.Message -> {
+                    val relayUrl = notification.relayUrl
+
+                    when (val message = notification.message.asEnum()) {
+                        is RelayMessageEnum.EventMsg -> {
+                            val event = message.event
+                            val subscriptionId = message.subscriptionId
+
+                            // Ignore events not from the newest gift wraps subscription
+                            if (subscriptionId != "newest-gift-wraps") continue
+
+                            // Prevent processing duplicate events
+                            if (processedEvent.contains(event.id())) continue
+                            processedEvent.add(event.id())
+
+                            if (event.kind().asStd()?.equals(KindStandard.GIFT_WRAP) == true) {
+                                try {
+                                    val rumor = extractRumor(event)
+
+                                    // Handle new message
+                                    rumor?.createdAt()?.asSecs()?.let {
+                                        if (it >= now.asSecs()) {
+                                            onNewMessage(rumor)
+                                        }
+                                    }
+                                } catch (e: Exception) {
+                                    println("Failed to extract rumor: $e")
+                                }
+                            }
+                        }
+
+                        else -> {}
+                    }
+                }
+
+                else -> {}
+            }
+        }
+    }
+
     suspend fun handleNotifications(
         onMetadataUpdate: (PublicKey, Metadata) -> Unit,
         onContactListUpdate: (List<PublicKey>) -> Unit,
         onNewMessage: (UnsignedEvent) -> Unit,
-        onEose: () -> Unit,
+        onSubscriptionClose: () -> Unit,
     ) = coroutineScope {
         val now = Timestamp.now()
         val processedEvent = mutableSetOf<EventId>()
@@ -251,7 +311,7 @@ class Nostr {
                                     // Start a new tracker
                                     eoseTrackerJob = launch {
                                         delay(10000) // Wait for 10 seconds
-                                        onEose()
+                                        onSubscriptionClose()
                                     }
 
                                     // Handle new message
@@ -270,7 +330,7 @@ class Nostr {
                             val subscriptionId = message.subscriptionId
 
                             if (subscriptionId == "messages") {
-                                onEose()
+                                onSubscriptionClose()
                             }
                         }
 
@@ -612,7 +672,9 @@ class Nostr {
                     signer = signer,
                     receiverPubkey = receiver,
                     rumor = rumor,
-                    extraTags = tags
+                    extraTags = listOf(
+                        Tag.custom(TagKind.Unknown("k"), listOf("14"))
+                    )
                 )
 
                 // Send the event to receiver's NIP-17 relays

shared/src/commonMain/kotlin/su/reya/coop/NostrViewModel.kt

@@ -131,14 +131,11 @@ class NostrViewModel(
         _metadataStore.getOrPut(pubkey) { MutableStateFlow(null) }.value = metadata
     }
 
-    suspend fun initAndConnect(dbPath: String) {
+    suspend fun login() {
         try {
-            // Initialize nostr client
-            nostr.init(dbPath)
-            // Get user's secret
             getUserSecret()
         } catch (e: Exception) {
-            showError("Failed to initialize Nostr: ${e.message}")
+            showError("Failed to login: ${e.message}")
         }
     }
 
@@ -151,7 +148,7 @@ class NostrViewModel(
                 onContactListUpdate = { contactList ->
                     _contactList.value = contactList.toSet()
                 },
-                onEose = {
+                onSubscriptionClose = {
                     getChatRooms()
                 },
                 onNewMessage = { event ->