From 360758a2f3629c0b65b3265d83550187193ba1a9 Mon Sep 17 00:00:00 2001
From: Vitor Pamplona <vitor@vitorpamplona.com>
Date: Fri, 9 Jun 2023 17:08:35 -0400
Subject: [PATCH] Adds a networking state monitoring services to reconnect when
 the phone disconnects from relays.

---
 app/src/main/AndroidManifest.xml              | 14 ++++++
 .../vitorpamplona/amethyst/ui/MainActivity.kt | 43 +++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 0420434f4..1accea6b1 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -5,15 +5,29 @@
         <package android:name="org.torproject.android"/>
     </queries>
 
+    <!-- Doesn't require a camera -->
     <uses-feature android:name="android.hardware.camera" android:required="false" />
 
+    <!-- To connect with relays -->
     <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- To Upload media (newer devices) -->
     <uses-permission android:name="android.permission.READ_MEDIA_IMAGES"/>
     <uses-permission android:name="android.permission.READ_MEDIA_VIDEO"/>
+
+    <!-- To Upload media (old devices) -->
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+
+    <!-- To read QRs that contain nostr:<NIP19> -->
     <uses-permission android:name="android.permission.CAMERA" />
+
+    <!-- To read NFCs that contain nostr:<NIP19> -->
     <uses-permission android:name="android.permission.NFC" />
 
+    <!-- To know receive notifications when the app connects/disconnects from the web -->
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+
+    <!-- Old permission to access media -->
     <uses-permission
         android:name="android.permission.WRITE_EXTERNAL_STORAGE"
         android:maxSdkVersion="28"
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt b/app/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt
index 607f1c837..5e0fe7109 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt
@@ -2,6 +2,10 @@ package com.vitorpamplona.amethyst.ui
 
 import android.content.Context
 import android.content.Intent
+import android.net.ConnectivityManager
+import android.net.Network
+import android.net.NetworkCapabilities
+import android.net.NetworkRequest
 import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.activity.result.contract.ActivityResultContracts
@@ -56,6 +60,15 @@ class MainActivity : FragmentActivity() {
             }
         }
 
+        val networkRequest = NetworkRequest.Builder()
+            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
+            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
+            .build()
+
+        val connectivityManager = getSystemService(ConnectivityManager::class.java) as ConnectivityManager
+        connectivityManager.requestNetwork(networkRequest, networkCallback)
+
         Client.lenient = true
     }
 
@@ -90,6 +103,36 @@ class MainActivity : FragmentActivity() {
             ServiceManager.cleanUp()
         }
     }
+
+    private val networkCallback = object : ConnectivityManager.NetworkCallback() {
+        // network is available for use
+        override fun onAvailable(network: Network) {
+            super.onAvailable(network)
+
+            // Only starts after login
+            GlobalScope.launch(Dispatchers.IO) {
+                ServiceManager.start(this@MainActivity)
+            }
+        }
+
+        // Network capabilities have changed for the network
+        override fun onCapabilitiesChanged(
+            network: Network,
+            networkCapabilities: NetworkCapabilities
+        ) {
+            super.onCapabilitiesChanged(network, networkCapabilities)
+        }
+
+        // lost network connection
+        override fun onLost(network: Network) {
+            super.onLost(network)
+
+            // Only starts after login
+            GlobalScope.launch(Dispatchers.IO) {
+                ServiceManager.pause()
+            }
+        }
+    }
 }
 
 class GetMediaActivityResultContract : ActivityResultContracts.GetContent() {