Automatically backup data before updating

app/src/main/kotlin/com/hippo/ehviewer/EhDB.kt

@@ -32,6 +32,7 @@ import com.hippo.ehviewer.dao.QuickSearch
 import com.hippo.ehviewer.dao.Schema17to18
 import com.hippo.ehviewer.download.DownloadManager
 import com.hippo.ehviewer.util.sendTo
+import com.hippo.unifile.UniFile
 import com.hippo.unifile.asUniFile
 import kotlinx.coroutines.flow.Flow
 import splitties.arch.room.roomDb
@@ -260,10 +261,10 @@ object EhDB {
         db.filterDao().update(filter)
     }
 
-    fun exportDB(context: Context, uri: Uri) {
+    fun exportDB(context: Context, file: UniFile) {
         db.query("PRAGMA wal_checkpoint(FULL)", null).use { it.moveToNext() }
         val dbFile = context.getDatabasePath(DB_NAME)
-        dbFile.asUniFile() sendTo uri.asUniFile()
+        dbFile.asUniFile() sendTo file
     }
 
     suspend fun importDB(context: Context, uri: Uri) {

app/src/main/kotlin/com/hippo/ehviewer/Settings.kt

@@ -143,6 +143,7 @@ object Settings : DataStorePreferences(null) {
     var showTagTranslations by boolPref(KEY_SHOW_TAG_TRANSLATIONS, false).observed { updateWhenTagTranslationChanges() }
     var appLinkVerifyTip by boolPref("app_link_verify_tip", false)
     var enabledSecurity by boolPref("enable_secure", false)
+    var backupBeforeUpdate by boolPref("backup_before_update", true)
     var useCIUpdateChannel by boolPref("ci_update_channel", false)
     var mediaScan by boolPref("media_scan", false).observed { updateWhenKeepMediaStatusChanges() }
     var hasDefaultDownloadLabel by boolPref("has_default_download_label", false)

app/src/main/kotlin/com/hippo/ehviewer/ui/settings/AboutScreen.kt

@@ -30,8 +30,10 @@ import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.fromHtml
 import androidx.compose.ui.unit.dp
 import com.hippo.ehviewer.BuildConfig
+import com.hippo.ehviewer.EhDB
 import com.hippo.ehviewer.R
 import com.hippo.ehviewer.Settings
+import com.hippo.ehviewer.download.downloadLocation
 import com.hippo.ehviewer.ui.destinations.LicenseScreenDestination
 import com.hippo.ehviewer.ui.tools.DialogState
 import com.hippo.ehviewer.ui.tools.LocalDialogState
@@ -39,6 +41,7 @@ import com.hippo.ehviewer.ui.tools.observed
 import com.hippo.ehviewer.updater.AppUpdater
 import com.hippo.ehviewer.updater.Release
 import com.hippo.ehviewer.util.AppConfig
+import com.hippo.ehviewer.util.ReadableTime
 import com.hippo.ehviewer.util.displayString
 import com.hippo.ehviewer.util.installPackage
 import com.ramcosta.composedestinations.annotation.Destination
@@ -48,6 +51,7 @@ import eu.kanade.tachiyomi.util.lang.withUIContext
 import java.io.File
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.datetime.Clock
 import moe.tarsin.coroutines.runSuspendCatching
 
 private const val REPO_URL = "https://github.com/${BuildConfig.REPO_NAME}"
@@ -108,6 +112,10 @@ fun AboutScreen(navigator: DestinationsNavigator) {
                 title = stringResource(id = R.string.settings_about_version),
                 summary = versionCode(),
             )
+            SwitchPreference(
+                title = stringResource(id = R.string.backup_before_update),
+                value = Settings::backupBeforeUpdate,
+            )
             SwitchPreference(
                 title = stringResource(id = R.string.use_ci_update_channel),
                 value = Settings::useCIUpdateChannel,
@@ -145,6 +153,12 @@ suspend fun DialogState.showNewVersion(context: Context, release: Release) {
             Text(text = release.changelog)
         }
     }
+    if (Settings.backupBeforeUpdate) {
+        val time = ReadableTime.getFilenamableTime(Clock.System.now().toEpochMilliseconds())
+        downloadLocation.createFile("$time.db")?.let {
+            EhDB.exportDB(context, it)
+        }
+    }
     // TODO: Download in the background and show progress in notification
     val file = File(AppConfig.tempDir, "update.apk").apply { delete() }
     AppUpdater.downloadUpdate(release.downloadLink, file)

app/src/main/kotlin/com/hippo/ehviewer/ui/settings/AdvancedScreen.kt

@@ -43,6 +43,7 @@ import com.hippo.ehviewer.ui.tools.observed
 import com.hippo.ehviewer.util.AppConfig
 import com.hippo.ehviewer.util.Crash
 import com.hippo.ehviewer.util.ReadableTime
+import com.hippo.unifile.asUniFile
 import com.jamal.composeprefs3.ui.prefs.SwitchPref
 import com.ramcosta.composedestinations.annotation.Destination
 import com.ramcosta.composedestinations.annotation.RootGraph
@@ -181,7 +182,7 @@ fun AdvancedScreen(navigator: DestinationsNavigator) {
                 uri?.let {
                     context.runCatching {
                         grantUriPermission(BuildConfig.APPLICATION_ID, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
-                        EhDB.exportDB(context, uri)
+                        EhDB.exportDB(context, uri.asUniFile())
                         launchSnackBar(getString(R.string.settings_advanced_export_data_to, uri.toString()))
                     }.onFailure {
                         logcat(it)

app/src/main/res/values-zh-rCN/strings.xml

@@ -424,6 +424,7 @@
     <string name="favorite_name">收藏画廊</string>
     <string name="black_dark_theme">纯黑深色主题</string>
     <string name="harmonize_category_color">类别颜色适配动态配色</string>
+    <string name="backup_before_update">更新前备份数据</string>
     <string name="use_ci_update_channel">使用持续集成(CI)构建频道更新</string>
     <string name="sort_by">排序依据</string>
     <string name="added_time_desc">添加时间（降序）</string>

app/src/main/res/values/strings.xml

@@ -519,6 +519,7 @@
     <string name="app_link_not_verified_message">For Android 12 and newer, you need to manually add link to verified links in order to open E-Hentai links in EhViewer.</string>
     <string name="app_link_not_verified_title">App links not verified</string>
     <string name="open_by_default">Open by default</string>
+    <string name="backup_before_update">Backup data before update</string>
     <string name="use_ci_update_channel">Use CI update channel</string>
     <string name="settings_privacy_require_unlock">Require Unlock</string>
     <string name="settings_privacy_require_unlock_delay">Lock Delay</string>