Add android proxy service

android/app/src/main/kotlin/com/hiddify/hiddify/MainActivity.kt

@@ -8,7 +8,6 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.lifecycleScope
 import com.hiddify.hiddify.bg.ServiceConnection
 import com.hiddify.hiddify.bg.ServiceNotification
-import com.hiddify.hiddify.bg.VPNService
 import com.hiddify.hiddify.constant.Alert
 import com.hiddify.hiddify.constant.Status
 import io.flutter.embedding.android.FlutterFragmentActivity
@@ -56,15 +55,15 @@ class MainActivity : FlutterFragmentActivity(), ServiceConnection.Callback {
             return
         }
         lifecycleScope.launch(Dispatchers.IO) {
-//            if (Settings.rebuildServiceMode()) {
+            if (Settings.rebuildServiceMode()) {
-//                reconnect()
+                reconnect()
-//            }
+            }
             if (prepare()) {
                 Log.d(TAG, "VPN permission required")
                 return@launch
             }
 
-            val intent = Intent(Application.application, VPNService::class.java)
+            val intent = Intent(Application.application, Settings.serviceClass())
             withContext(Dispatchers.Main) {
                 ContextCompat.startForegroundService(Application.application, intent)
             }

android/app/src/main/kotlin/com/hiddify/hiddify/Settings.kt

@@ -1,7 +1,12 @@
 package com.hiddify.hiddify
 
 import android.content.Context
+import com.hiddify.hiddify.bg.ProxyService
+import com.hiddify.hiddify.bg.VPNService
+import com.hiddify.hiddify.constant.ServiceMode
 import com.hiddify.hiddify.constant.SettingsKey
+import org.json.JSONObject
+import java.io.File
 
 object Settings {
 
@@ -24,6 +29,11 @@ object Settings {
         get() = preferences.getString(SettingsKey.ACTIVE_CONFIG_PATH, "") ?: ""
         set(value) = preferences.edit().putString(SettingsKey.ACTIVE_CONFIG_PATH, value).apply()
 
+    var serviceMode: String
+        get() = preferences.getString(SettingsKey.SERVICE_MODE, ServiceMode.NORMAL)
+            ?: ServiceMode.NORMAL
+        set(value) = preferences.edit().putString(SettingsKey.SERVICE_MODE, value).apply()
+
     var configOptions: String
         get() = preferences.getString(SettingsKey.CONFIG_OPTIONS, "") ?: ""
         set(value) = preferences.edit().putString(SettingsKey.CONFIG_OPTIONS, value).apply()
@@ -39,5 +49,41 @@ object Settings {
     var startedByUser: Boolean
         get() = preferences.getBoolean(SettingsKey.STARTED_BY_USER, false)
         set(value) = preferences.edit().putBoolean(SettingsKey.STARTED_BY_USER, value).apply()
+
+    fun serviceClass(): Class<*> {
+        return when (serviceMode) {
+            ServiceMode.VPN -> VPNService::class.java
+            else -> ProxyService::class.java
+        }
+    }
+
+    suspend fun rebuildServiceMode(): Boolean {
+        var newMode = ServiceMode.NORMAL
+        try {
+            if (needVPNService()) {
+                newMode = ServiceMode.VPN
+            }
+        } catch (_: Exception) {
+        }
+        if (serviceMode == newMode) {
+            return false
+        }
+        serviceMode = newMode
+        return true
+    }
+
+    private suspend fun needVPNService(): Boolean {
+        val filePath = activeConfigPath
+        if (filePath.isBlank()) return false
+        val content = JSONObject(File(filePath).readText())
+        val inbounds = content.getJSONArray("inbounds")
+        for (index in 0 until inbounds.length()) {
+            val inbound = inbounds.getJSONObject(index)
+            if (inbound.getString("type") == "tun") {
+                return true
+            }
+        }
+        return false
+    }
 }
 

android/app/src/main/kotlin/com/hiddify/hiddify/bg/PlatformInterfaceWrapper.kt

@@ -30,6 +30,10 @@ interface PlatformInterfaceWrapper : PlatformInterface {
         error("invalid argument")
     }
 
+    override fun closeTun() {
+        error("invalid argument")
+    }
+
     override fun useProcFS(): Boolean {
         return Build.VERSION.SDK_INT < Build.VERSION_CODES.Q
     }

android/app/src/main/kotlin/com/hiddify/hiddify/bg/ProxyService.kt

@@ -0,0 +1,17 @@
+package com.hiddify.hiddify.bg
+
+import android.app.Service
+import android.content.Intent
+
+class ProxyService : Service(), PlatformInterfaceWrapper {
+
+    private val service = BoxService(this, this)
+
+    override fun onStartCommand(intent: Intent, flags: Int, startId: Int) =
+        service.onStartCommand(intent, flags, startId)
+
+    override fun onBind(intent: Intent) = service.onBind(intent)
+    override fun onDestroy() = service.onDestroy()
+
+    override fun writeLog(message: String) = service.writeLog(message)
+}

android/app/src/main/kotlin/com/hiddify/hiddify/bg/ServiceConnection.kt

@@ -36,7 +36,7 @@ class ServiceConnection(
     fun connect() {
         val intent = runBlocking {
             withContext(Dispatchers.IO) {
-                Intent(context, VPNService::class.java).setAction(Action.SERVICE)
+                Intent(context, Settings.serviceClass()).setAction(Action.SERVICE)
             }
         }
         context.bindService(intent, this, AppCompatActivity.BIND_AUTO_CREATE)
@@ -56,7 +56,7 @@ class ServiceConnection(
         }
         val intent = runBlocking {
             withContext(Dispatchers.IO) {
-                Intent(context, VPNService::class.java).setAction(Action.SERVICE)
+                Intent(context, Settings.serviceClass()).setAction(Action.SERVICE)
             }
         }
         context.bindService(intent, this, AppCompatActivity.BIND_AUTO_CREATE)

android/app/src/main/kotlin/com/hiddify/hiddify/constant/ServiceMode.kt

@@ -0,0 +1,6 @@
+package com.hiddify.hiddify.constant
+
+object ServiceMode {
+    const val NORMAL = "normal"
+    const val VPN = "vpn"
+}

android/app/src/main/kotlin/com/hiddify/hiddify/constant/SettingsKey.kt

@@ -4,6 +4,7 @@ object SettingsKey {
     private const val KEY_PREFIX = "flutter."
 
     const val ACTIVE_CONFIG_PATH = "${KEY_PREFIX}active_config_path"
+    const val SERVICE_MODE = "${KEY_PREFIX}service_mode"
 
     const val CONFIG_OPTIONS = "config_options_json"