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/database/ProfileManager.kt

@@ -23,6 +23,8 @@ package com.github.shadowsocks.database
 import android.util.Log
 import com.github.shadowsocks.App.Companion.app
 import com.github.shadowsocks.ProfilesFragment
+import com.github.shadowsocks.preference.DataStore
+import com.github.shadowsocks.utils.DirectBoot
 
 object ProfileManager {
     private const val TAG = "ProfileManager"
@@ -41,10 +43,10 @@ object ProfileManager {
                 profile.individual = oldProfile.individual
                 profile.udpdns = oldProfile.udpdns
             }
-            val last = DBHelper.profileDao.queryRaw(DBHelper.profileDao.queryBuilder().selectRaw("MAX(userOrder)")
-                    .prepareStatementString()).firstResult
+            val last = PrivateDatabase.profileDao.queryRaw(PrivateDatabase.profileDao.queryBuilder()
+                    .selectRaw("MAX(userOrder)").prepareStatementString()).firstResult
             if (last != null && last.size == 1 && last[0] != null) profile.userOrder = last[0].toLong() + 1
-            DBHelper.profileDao.createOrUpdate(profile)
+            PrivateDatabase.profileDao.createOrUpdate(profile)
             ProfilesFragment.instance?.profilesAdapter?.add(profile)
         } catch (ex: Exception) {
             Log.e(TAG, "addProfile", ex)
@@ -53,8 +55,11 @@ object ProfileManager {
         return profile
     }
 
+    /**
+     * Note: It's caller's responsibility to update DirectBoot profile if necessary.
+     */
     fun updateProfile(profile: Profile): Boolean = try {
-        DBHelper.profileDao.update(profile)
+        PrivateDatabase.profileDao.update(profile)
         true
     } catch (ex: Exception) {
         Log.e(TAG, "updateProfile", ex)
@@ -63,7 +68,7 @@ object ProfileManager {
     }
 
     fun getProfile(id: Int): Profile? = try {
-        DBHelper.profileDao.queryForId(id)
+        PrivateDatabase.profileDao.queryForId(id)
     } catch (ex: Exception) {
         Log.e(TAG, "getProfile", ex)
         app.track(ex)
@@ -71,8 +76,9 @@ object ProfileManager {
     }
 
     fun delProfile(id: Int): Boolean = try {
-        DBHelper.profileDao.deleteById(id)
+        PrivateDatabase.profileDao.deleteById(id)
         ProfilesFragment.instance?.profilesAdapter?.removeId(id)
+        if (id == DataStore.profileId && DataStore.directBootAware) DirectBoot.clean()
         true
     } catch (ex: Exception) {
         Log.e(TAG, "delProfile", ex)
@@ -81,7 +87,7 @@ object ProfileManager {
     }
 
     fun getFirstProfile(): Profile? = try {
-        val result = DBHelper.profileDao.query(DBHelper.profileDao.queryBuilder().limit(1L).prepare())
+        val result = PrivateDatabase.profileDao.query(PrivateDatabase.profileDao.queryBuilder().limit(1L).prepare())
         if (result.size == 1) result[0] else null
     } catch (ex: Exception) {
         Log.e(TAG, "getAllProfiles", ex)
@@ -90,7 +96,7 @@ object ProfileManager {
     }
 
     fun getAllProfiles(): List<Profile>? = try {
-        DBHelper.profileDao.query(DBHelper.profileDao.queryBuilder().orderBy("userOrder", true).prepare())
+        PrivateDatabase.profileDao.query(PrivateDatabase.profileDao.queryBuilder().orderBy("userOrder", true).prepare())
     } catch (ex: Exception) {
         Log.e(TAG, "getAllProfiles", ex)
         app.track(ex)