[wallet] Allow exporting the entire DB

6 files changed, 79 insertions, 2 deletions

diff --git a/wallet/src/main/java/net/taler/wallet/backend/WalletBackendService.kt b/wallet/src/main/java/net/taler/wallet/backend/WalletBackendService.kt
index f99f38d..06e0627 100644
--- a/wallet/src/main/java/net/taler/wallet/backend/WalletBackendService.kt
+++ b/wallet/src/main/java/net/taler/wallet/backend/WalletBackendService.kt
@@ -35,6 +35,7 @@ import java.util.concurrent.ConcurrentHashMap
 import kotlin.system.exitProcess
 
 private const val TAG = "taler-wallet-backend"
+const val WALLET_DB = "talerwalletdb-v30.json"
 
 class RequestData(val clientRequestId: Int, val messenger: Messenger)
 
@@ -83,7 +84,7 @@ class WalletBackendService : Service() {
         msg.put("operation", "init")
         val args = JSONObject()
         msg.put("args", args)
-        args.put("persistentStoragePath", "${application.filesDir}/talerwalletdb-v30.json")
+        args.put("persistentStoragePath", "${application.filesDir}/$WALLET_DB")
         akono.sendMessage(msg.toString())
     }
 
diff --git a/wallet/src/main/java/net/taler/wallet/settings/SettingsFragment.kt b/wallet/src/main/java/net/taler/wallet/settings/SettingsFragment.kt
index ecf45a6..3d31dc5 100644
--- a/wallet/src/main/java/net/taler/wallet/settings/SettingsFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/settings/SettingsFragment.kt
@@ -48,6 +48,7 @@ class SettingsFragment : PreferenceFragmentCompat() {
     private lateinit var prefDevMode: SwitchPreferenceCompat
     private lateinit var prefWithdrawTest: Preference
     private lateinit var prefLogcat: Preference
+    private lateinit var prefExportDb: Preference
     private lateinit var prefVersionApp: Preference
     private lateinit var prefVersionCore: Preference
     private lateinit var prefVersionExchange: Preference
@@ -58,6 +59,7 @@ class SettingsFragment : PreferenceFragmentCompat() {
             prefBackup,
             prefWithdrawTest,
             prefLogcat,
+            prefExportDb,
             prefVersionApp,
             prefVersionCore,
             prefVersionExchange,
@@ -69,6 +71,9 @@ class SettingsFragment : PreferenceFragmentCompat() {
     private val logLauncher = registerForActivityResult(CreateDocument("text/plain")) { uri ->
         settingsManager.exportLogcat(uri)
     }
+    private val dbExportLauncher = registerForActivityResult(CreateDocument("application/json")) { uri ->
+        settingsManager.exportDb(uri)
+    }
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.settings_main, rootKey)
@@ -76,6 +81,7 @@ class SettingsFragment : PreferenceFragmentCompat() {
         prefDevMode = findPreference("pref_dev_mode")!!
         prefWithdrawTest = findPreference("pref_testkudos")!!
         prefLogcat = findPreference("pref_logcat")!!
+        prefExportDb = findPreference("pref_export_db")!!
         prefVersionApp = findPreference("pref_version_app")!!
         prefVersionCore = findPreference("pref_version_core")!!
         prefVersionExchange = findPreference("pref_version_protocol_exchange")!!
@@ -125,6 +131,10 @@ class SettingsFragment : PreferenceFragmentCompat() {
             logLauncher.launch("taler-wallet-log-${currentTimeMillis()}.txt")
             true
         }
+        prefExportDb.setOnPreferenceClickListener {
+            dbExportLauncher.launch("taler-wallet-db-${currentTimeMillis()}.json")
+            true
+        }
 
         prefReset.setOnPreferenceClickListener {
             showResetDialog()
diff --git a/wallet/src/main/java/net/taler/wallet/settings/SettingsManager.kt b/wallet/src/main/java/net/taler/wallet/settings/SettingsManager.kt
index 6bf1673..349c7b1 100644
--- a/wallet/src/main/java/net/taler/wallet/settings/SettingsManager.kt
+++ b/wallet/src/main/java/net/taler/wallet/settings/SettingsManager.kt
@@ -26,6 +26,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import net.taler.wallet.R
+import net.taler.wallet.backend.WALLET_DB
 
 class SettingsManager(
     private val context: Context,
@@ -59,4 +60,31 @@ class SettingsManager(
         Toast.makeText(context, R.string.settings_logcat_error, LENGTH_LONG).show()
     }
 
+    fun exportDb(uri: Uri?) {
+        if (uri == null) {
+            onDbExportError()
+            return
+        }
+        scope.launch(Dispatchers.IO) {
+            try {
+                context.contentResolver.openOutputStream(uri, "wt")?.use { outputStream ->
+                    context.openFileInput(WALLET_DB).use { inputStream ->
+                        inputStream.copyTo(outputStream)
+                    }
+                } ?: onDbExportError()
+            } catch (e: Exception) {
+                Log.e(SettingsManager::class.simpleName, "Error exporting db: ", e)
+                onDbExportError()
+                return@launch
+            }
+            withContext(Dispatchers.Main) {
+                Toast.makeText(context, R.string.settings_db_export_success, LENGTH_LONG).show()
+            }
+        }
+    }
+
+    private fun onDbExportError() {
+        Toast.makeText(context, R.string.settings_db_export_error, LENGTH_LONG).show()
+    }
+
 }
diff --git a/wallet/src/main/res/drawable/ic_unarchive.xml b/wallet/src/main/res/drawable/ic_unarchive.xml
new file mode 100644
index 0000000..e6faf51
--- /dev/null
+++ b/wallet/src/main/res/drawable/ic_unarchive.xml
@@ -0,0 +1,26 @@
+<!--
+  ~ This file is part of GNU Taler
+  ~ (C) 2022 Taler Systems S.A.
+  ~
+  ~ GNU Taler is free software; you can redistribute it and/or modify it under the
+  ~ terms of the GNU General Public License as published by the Free Software
+  ~ Foundation; either version 3, or (at your option) any later version.
+  ~
+  ~ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+  ~ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+  ~ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with
+  ~ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:tint="#000000"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="?attr/colorControlNormal"
+        android:pathData="M20.55,5.22l-1.39,-1.68C18.88,3.21 18.47,3 18,3H6C5.53,3 5.12,3.21 4.85,3.55L3.46,5.22C3.17,5.57 3,6.01 3,6.5V19c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2V6.5C21,6.01 20.83,5.57 20.55,5.22zM12,9.5l5.5,5.5H14v2h-4v-2H6.5L12,9.5zM5.12,5l0.82,-1h12l0.93,1H5.12z" />
+</vector>
diff --git a/wallet/src/main/res/values/strings.xml b/wallet/src/main/res/values/strings.xml
index 2b81894..5fba9f1 100644
--- a/wallet/src/main/res/values/strings.xml
+++ b/wallet/src/main/res/values/strings.xml
@@ -214,9 +214,13 @@ GNU Taler is immune against many types of fraud, such as phishing of credit card
     <string name="settings_withdraw_testkudos">Withdraw TESTKUDOS</string>
     <string name="settings_withdraw_testkudos_summary">Get money for testing</string>
     <string name="settings_logcat">Debug log</string>
-    <string name="settings_logcat_summary">View/send internal log</string>
+    <string name="settings_logcat_summary">Save internal log</string>
     <string name="settings_logcat_error">Error exporting log</string>
     <string name="settings_logcat_success">Log exported to file</string>
+    <string name="settings_db_export">Database</string>
+    <string name="settings_db_export_summary">Save internal database</string>
+    <string name="settings_db_export_error">Error exporting database</string>
+    <string name="settings_db_export_success">Database exported to file</string>
     <string name="settings_version_app">App Version</string>
     <string name="settings_version_core">Wallet Core Version</string>
     <string name="settings_version_protocol_exchange">Supported Exchange Versions</string>
diff --git a/wallet/src/main/res/xml/settings_main.xml b/wallet/src/main/res/xml/settings_main.xml
index a713838..101aa37 100644
--- a/wallet/src/main/res/xml/settings_main.xml
+++ b/wallet/src/main/res/xml/settings_main.xml
@@ -55,6 +55,14 @@
         tools:isPreferenceVisible="true" />
 
     <Preference
+        app:icon="@drawable/ic_unarchive"
+        app:isPreferenceVisible="false"
+        app:key="pref_export_db"
+        app:summary="@string/settings_db_export_summary"
+        app:title="@string/settings_db_export"
+        tools:isPreferenceVisible="true" />
+
+    <Preference
         app:icon="@drawable/ic_account_balance_wallet"
         app:isPreferenceVisible="false"
         app:key="pref_version_app"