1 files changed, 64 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/NetworkManager.kt b/wallet/src/main/java/net/taler/wallet/NetworkManager.kt
new file mode 100644
index 0000000..a45ad48
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/NetworkManager.kt
@@ -0,0 +1,64 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2023 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet
+
+import android.content.Context
+import android.content.Context.CONNECTIVITY_SERVICE
+import android.net.ConnectivityManager
+import android.net.Network
+import android.net.NetworkCapabilities
+import android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET
+import android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED
+import androidx.annotation.UiThread
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+
+class NetworkManager(context: Context) : ConnectivityManager.NetworkCallback() {
+    private val connectivityManager: ConnectivityManager
+
+    private val _networkStatus: MutableLiveData<Boolean>
+    val networkStatus: LiveData<Boolean>
+
+    init {
+        // careful, the order below is important, should probably get simplified
+        connectivityManager = context.getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
+        _networkStatus = MutableLiveData(getCurrentStatus())
+        networkStatus = _networkStatus
+        connectivityManager.registerDefaultNetworkCallback(this)
+    }
+
+    @UiThread
+    override fun onCapabilitiesChanged(network: Network, networkCapabilities: NetworkCapabilities) {
+        super.onCapabilitiesChanged(network, networkCapabilities)
+        _networkStatus.postValue(networkCapabilities.isOnline())
+    }
+
+    override fun onLost(network: Network) {
+        super.onLost(network)
+        _networkStatus.postValue(getCurrentStatus())
+    }
+
+    private fun getCurrentStatus(): Boolean {
+        return connectivityManager.activeNetwork?.let { network ->
+            connectivityManager.getNetworkCapabilities(network)?.isOnline()
+        } ?: false
+    }
+
+    private fun NetworkCapabilities.isOnline(): Boolean {
+        return hasCapability(NET_CAPABILITY_INTERNET) && hasCapability(NET_CAPABILITY_VALIDATED)
+    }
+}