Implement direct boot awareness

To do direct boot, important files need to be moved to device storage (i.e. not as safe storage). The only thing sensitive is user credentials (server settings in each profile) and the config file passed to libss-*.so. In order to implement direct boot, at least the active profile has to be moved/copied to device storage.

This commit keeps profile information (and temporary data used by ProfileConfigFragment) and Shadowsocks config in credential storage and move everything else to device storage. In order to make direct boot work, active profile is also copied into device storage and Shadowsocks config file is created in device storage during direct boot. Cleanup of those information is also implemented.

Fixes #1457.

NB:

* `android:directBootAware` can't be used on application element. That seems to be used by system apps.
* Works fine with multi-user;
* Old GSM files are not migrated (see App.kt) to device storage.

mobile/src/main/java/com/github/shadowsocks/App.kt

@@ -24,6 +24,7 @@ import android.app.Application
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.content.BroadcastReceiver
+import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
 import android.content.pm.PackageInfo
@@ -34,9 +35,12 @@ import android.os.Handler
 import android.os.LocaleList
 import android.os.Looper
 import android.support.annotation.RequiresApi
+import android.support.v4.os.UserManagerCompat
 import android.support.v7.app.AppCompatDelegate
 import android.util.Log
+import com.evernote.android.job.JobConstants
 import com.evernote.android.job.JobManager
+import com.github.shadowsocks.acl.Acl
 import com.github.shadowsocks.acl.AclSyncJob
 import com.github.shadowsocks.bg.BaseService
 import com.github.shadowsocks.database.Profile
@@ -44,10 +48,7 @@ import com.github.shadowsocks.database.ProfileManager
 import com.github.shadowsocks.preference.BottomSheetPreferenceDialogFragment
 import com.github.shadowsocks.preference.DataStore
 import com.github.shadowsocks.preference.IconListPreference
-import com.github.shadowsocks.utils.Action
-import com.github.shadowsocks.utils.Key
-import com.github.shadowsocks.utils.TcpFastOpen
-import com.github.shadowsocks.utils.broadcastReceiver
+import com.github.shadowsocks.utils.*
 import com.google.android.gms.analytics.GoogleAnalytics
 import com.google.android.gms.analytics.HitBuilders
 import com.google.android.gms.analytics.StandardExceptionParser
@@ -75,8 +76,9 @@ class App : Application() {
     }
 
     val handler by lazy { Handler(Looper.getMainLooper()) }
+    val deviceContext: Context by lazy { if (Build.VERSION.SDK_INT < 24) this else DeviceContext(this) }
     val remoteConfig: FirebaseRemoteConfig by lazy { FirebaseRemoteConfig.getInstance() }
-    private val tracker: Tracker by lazy { GoogleAnalytics.getInstance(this).newTracker(R.xml.tracker) }
+    private val tracker: Tracker by lazy { GoogleAnalytics.getInstance(deviceContext).newTracker(R.xml.tracker) }
     val info: PackageInfo by lazy { packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES) }
 
     fun startService() {
@@ -86,7 +88,8 @@ class App : Application() {
     fun reloadService() = sendBroadcast(Intent(Action.RELOAD))
     fun stopService() = sendBroadcast(Intent(Action.CLOSE))
 
-    val currentProfile: Profile? get() = ProfileManager.getProfile(DataStore.profileId)
+    val currentProfile: Profile? get() =
+        if (DataStore.directBootAware) DirectBoot.getDeviceProfile() else ProfileManager.getProfile(DataStore.profileId)
 
     fun switchProfile(id: Int): Profile {
         val result = ProfileManager.getProfile(id) ?: ProfileManager.createProfile()
@@ -162,31 +165,42 @@ class App : Application() {
         if (!BuildConfig.DEBUG) System.setProperty(LocalLog.LOCAL_LOG_LEVEL_PROPERTY, "ERROR")
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
         checkChineseLocale(resources.configuration)
+        PreferenceFragmentCompat.registerPreferenceFragment(IconListPreference::class.java,
+                BottomSheetPreferenceDialogFragment::class.java)
 
-        FirebaseApp.initializeApp(this)
+        if (Build.VERSION.SDK_INT >= 24) {  // migrate old files
+            deviceContext.moveDatabaseFrom(this, Key.DB_PUBLIC)
+            deviceContext.moveDatabaseFrom(this, JobConstants.DATABASE_NAME)
+            deviceContext.moveSharedPreferencesFrom(this, JobConstants.PREF_FILE_NAME)
+            val old = Acl.getFile(Acl.CUSTOM_RULES, this)
+            if (old.canRead()) {
+                Acl.getFile(Acl.CUSTOM_RULES).writeText(old.readText())
+                old.delete()
+            }
+        }
+
+        FirebaseApp.initializeApp(deviceContext)
         remoteConfig.setDefaults(R.xml.default_configs)
         remoteConfig.fetch().addOnCompleteListener {
             if (it.isSuccessful) remoteConfig.activateFetched() else Log.e(TAG, "Failed to fetch config")
         }
+        JobManager.create(deviceContext).addJobCreator(AclSyncJob)
 
-        JobManager.create(this).addJobCreator(AclSyncJob)
-        PreferenceFragmentCompat.registerPreferenceFragment(IconListPreference::class.java,
-                BottomSheetPreferenceDialogFragment::class.java)
-
-        TcpFastOpen.enabled(DataStore.getBoolean(Key.tfo, TcpFastOpen.sendEnabled))
-
-        if (DataStore.getLong(Key.assetUpdateTime, -1) != info.lastUpdateTime) {
+        // handle data restored
+        if (DataStore.directBootAware && UserManagerCompat.isUserUnlocked(this)) DirectBoot.update()
+        TcpFastOpen.enabled(DataStore.publicStore.getBoolean(Key.tfo, TcpFastOpen.sendEnabled))
+        if (DataStore.publicStore.getLong(Key.assetUpdateTime, -1) != info.lastUpdateTime) {
             val assetManager = assets
             for (dir in arrayOf("acl", "overture"))
                 try {
                     for (file in assetManager.list(dir)) assetManager.open(dir + '/' + file).use { input ->
-                        File(filesDir, file).outputStream().use { output -> input.copyTo(output) }
+                        File(deviceContext.filesDir, file).outputStream().use { output -> input.copyTo(output) }
                     }
                 } catch (e: IOException) {
                     Log.e(TAG, e.message)
                     app.track(e)
                 }
-            DataStore.putLong(Key.assetUpdateTime, info.lastUpdateTime)
+            DataStore.publicStore.putLong(Key.assetUpdateTime, info.lastUpdateTime)
         }
 
         if (Build.VERSION.SDK_INT >= 26) @RequiresApi(26) {