Delete all backups (if possible) when user generates a new recovery code

app/src/main/java/com/stevesoltys/seedvault/App.kt

@@ -44,7 +44,7 @@ class App : Application() {
         factory { AppListRetriever(this@App, get(), get(), get()) }
 
         viewModel { SettingsViewModel(this@App, get(), get(), get(), get(), get()) }
-        viewModel { RecoveryCodeViewModel(this@App, get(), get()) }
+        viewModel { RecoveryCodeViewModel(this@App, get(), get(), get()) }
         viewModel { BackupStorageViewModel(this@App, get(), get(), get()) }
         viewModel { RestoreStorageViewModel(this@App, get(), get()) }
         viewModel { RestoreViewModel(this@App, get(), get(), get(), get(), get()) }

app/src/main/java/com/stevesoltys/seedvault/plugins/saf/DocumentsProviderBackupPlugin.kt

@@ -44,6 +44,11 @@ internal class DocumentsProviderBackupPlugin(
         storage.currentFullBackupDir ?: throw IOException()
     }
 
+    @Throws(IOException::class)
+    override suspend fun deleteAllBackups() {
+        storage.rootBackupDir?.deleteContents(context)
+    }
+
     @Throws(IOException::class)
     override suspend fun getMetadataOutputStream(): OutputStream {
         val setDir = storage.getSetDir() ?: throw IOException()

app/src/main/java/com/stevesoltys/seedvault/transport/backup/BackupPlugin.kt

@@ -25,6 +25,12 @@ interface BackupPlugin {
     @Throws(IOException::class)
     suspend fun initializeDevice()
 
+    /**
+     * Delete all existing [RestoreSet]s from the storage medium.
+     */
+    @Throws(IOException::class)
+    suspend fun deleteAllBackups()
+
     /**
      * Returns an [OutputStream] for writing backup metadata.
      */

app/src/main/java/com/stevesoltys/seedvault/ui/recoverycode/RecoveryCodeInputFragment.kt

@@ -190,6 +190,7 @@ class RecoveryCodeInputFragment : Fragment() {
 
     private val regenRequest = registerForActivityResult(StartActivityForResult()) {
         if (it.resultCode == RESULT_OK) {
+            viewModel.deleteAllBackup()
             parentFragmentManager.popBackStack()
             Snackbar.make(requireView(), R.string.recovery_code_recreated, Snackbar.LENGTH_LONG)
                 .show()
@@ -203,7 +204,6 @@ class RecoveryCodeInputFragment : Fragment() {
             .setMessage(R.string.recovery_code_verification_new_dialog_message)
             .setPositiveButton(R.string.recovery_code_verification_generate_new) { dialog, _ ->
                 dialog.dismiss()
-                // TODO try to delete backups
                 val i = Intent(requireContext(), RecoveryCodeActivity::class.java)
                 regenRequest.launch(i)
             }

app/src/main/java/com/stevesoltys/seedvault/ui/recoverycode/RecoveryCodeViewModel.kt

@@ -1,9 +1,11 @@
 package com.stevesoltys.seedvault.ui.recoverycode
 
+import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import com.stevesoltys.seedvault.App
 import com.stevesoltys.seedvault.crypto.Crypto
 import com.stevesoltys.seedvault.crypto.KeyManager
+import com.stevesoltys.seedvault.transport.backup.BackupPlugin
 import com.stevesoltys.seedvault.ui.LiveEvent
 import com.stevesoltys.seedvault.ui.MutableLiveEvent
 import io.github.novacrypto.bip39.JavaxPBKDF2WithHmacSHA512
@@ -16,6 +18,10 @@ import io.github.novacrypto.bip39.Validation.UnexpectedWhiteSpaceException
 import io.github.novacrypto.bip39.Validation.WordNotFoundException
 import io.github.novacrypto.bip39.Words
 import io.github.novacrypto.bip39.wordlists.English
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import java.io.IOException
 import java.security.SecureRandom
 import java.util.ArrayList
 
@@ -25,7 +31,8 @@ internal const val WORD_LIST_SIZE = 2048
 class RecoveryCodeViewModel(
     app: App,
     private val crypto: Crypto,
-    private val keyManager: KeyManager
+    private val keyManager: KeyManager,
+    private val backupPlugin: BackupPlugin
 ) : AndroidViewModel(app) {
 
     internal val wordList: List<CharSequence> by lazy {
@@ -69,4 +76,14 @@ class RecoveryCodeViewModel(
         }
     }
 
+    fun deleteAllBackup() {
+        GlobalScope.launch(Dispatchers.IO) {
+            try {
+                backupPlugin.deleteAllBackups()
+            } catch (e: IOException) {
+                Log.e("RecoveryCodeViewModel", "Error deleting backups", e)
+            }
+        }
+    }
+
 }