Add Telegram backup feature

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/TelegramBackupUploader.kt

@@ -0,0 +1,93 @@
+package org.koitharu.kotatsu.core.backup
+
+import android.content.Context
+import androidx.annotation.CheckResult
+import dagger.hilt.android.qualifiers.ApplicationContext
+import okhttp3.HttpUrl
+import okhttp3.MediaType.Companion.toMediaTypeOrNull
+import okhttp3.MultipartBody
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.asRequestBody
+import okhttp3.Response
+import okhttp3.internal.closeQuietly
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.nav.AppRouter
+import org.koitharu.kotatsu.core.network.BaseHttpClient
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.parsers.util.await
+import org.koitharu.kotatsu.parsers.util.json.getBooleanOrDefault
+import org.koitharu.kotatsu.parsers.util.json.getStringOrNull
+import org.koitharu.kotatsu.parsers.util.parseJson
+import java.io.File
+import javax.inject.Inject
+
+class TelegramBackupUploader @Inject constructor(
+	private val settings: AppSettings,
+	@BaseHttpClient private val client: OkHttpClient,
+	@ApplicationContext private val context: Context,
+) {
+
+	private val botToken = context.getString(R.string.tg_backup_bot_token)
+
+	suspend fun uploadBackup(file: File) {
+		val requestBody = file.asRequestBody("application/zip".toMediaTypeOrNull())
+		val multipartBody = MultipartBody.Builder()
+			.setType(MultipartBody.FORM)
+			.addFormDataPart("chat_id", requireChatId())
+			.addFormDataPart("document", file.name, requestBody)
+			.build()
+		val request = Request.Builder()
+			.url(urlOf("sendDocument").build())
+			.post(multipartBody)
+			.build()
+		client.newCall(request).await().consume()
+	}
+
+	suspend fun sendTestMessage() {
+		val request = Request.Builder()
+			.url(urlOf("getMe").build())
+			.build()
+		client.newCall(request).await().consume()
+		sendMessage(context.getString(R.string.backup_tg_echo))
+	}
+
+	@CheckResult
+	fun openBotInApp(router: AppRouter): Boolean {
+		val botUsername = context.getString(R.string.tg_backup_bot_name)
+		return router.openExternalBrowser("tg://resolve?domain=$botUsername") ||
+			router.openExternalBrowser("https://t.me/$botUsername")
+	}
+
+	private suspend fun sendMessage(message: String) {
+		val url = urlOf("sendMessage")
+			.addQueryParameter("chat_id", requireChatId())
+			.addQueryParameter("text", message)
+			.build()
+		val request = Request.Builder()
+			.url(url)
+			.build()
+		client.newCall(request).await().consume()
+	}
+
+	private fun requireChatId() = checkNotNull(settings.backupTelegramChatId) {
+		"Telegram chat ID not set in settings"
+	}
+
+	private fun Response.consume() {
+		if (isSuccessful) {
+			closeQuietly()
+			return
+		}
+		val jo = parseJson()
+		if (!jo.getBooleanOrDefault("ok", true)) {
+			throw RuntimeException(jo.getStringOrNull("description"))
+		}
+	}
+
+	private fun urlOf(method: String) = HttpUrl.Builder()
+		.scheme("https")
+		.host("api.telegram.org")
+		.addPathSegment("bot$botToken")
+		.addPathSegment(method)
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -490,6 +490,12 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		get() = prefs.getString(KEY_BACKUP_PERIODICAL_OUTPUT, null)?.toUriOrNull()
 		set(value) = prefs.edit { putString(KEY_BACKUP_PERIODICAL_OUTPUT, value?.toString()) }
 
+	val isBackupTelegramUploadEnabled: Boolean
+		get() = prefs.getBoolean(KEY_BACKUP_TG_ENABLED, false)
+
+	val backupTelegramChatId: String?
+		get() = prefs.getString(KEY_BACKUP_TG_CHAT, null)?.nullIfEmpty()
+
 	val isReadingTimeEstimationEnabled: Boolean
 		get() = prefs.getBoolean(KEY_READING_TIME, true)
 
@@ -717,6 +723,8 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_SOURCES_VERSION = "sources_version"
 		const val KEY_SOURCES_ENABLED_ALL = "sources_enabled_all"
 		const val KEY_QUICK_FILTER = "quick_filter"
+		const val KEY_BACKUP_TG_ENABLED = "backup_periodic_tg_enabled"
+		const val KEY_BACKUP_TG_CHAT = "backup_periodic_tg_chat_id"
 
 		// keys for non-persistent preferences
 		const val KEY_APP_VERSION = "app_version"
@@ -730,6 +738,8 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_PROXY_TEST = "proxy_test"
 		const val KEY_OPEN_BROWSER = "open_browser"
 		const val KEY_HANDLE_LINKS = "handle_links"
+		const val KEY_BACKUP_TG_OPEN = "backup_periodic_tg_open"
+		const val KEY_BACKUP_TG_TEST = "backup_periodic_tg_test"
 		const val KEY_CLEAR_MANGA_DATA = "manga_data_clear"
 
 		// old keys are for migration only

app/src/main/kotlin/org/koitharu/kotatsu/settings/backup/PeriodicalBackupService.kt

@@ -5,6 +5,7 @@ import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.core.backup.BackupRepository
 import org.koitharu.kotatsu.core.backup.BackupZipOutput
 import org.koitharu.kotatsu.core.backup.ExternalBackupStorage
+import org.koitharu.kotatsu.core.backup.TelegramBackupUploader
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.CoroutineIntentService
 import javax.inject.Inject
@@ -15,6 +16,9 @@ class PeriodicalBackupService : CoroutineIntentService() {
 	@Inject
 	lateinit var externalBackupStorage: ExternalBackupStorage
 
+	@Inject
+	lateinit var telegramBackupUploader: TelegramBackupUploader
+
 	@Inject
 	lateinit var repository: BackupRepository
 
@@ -43,6 +47,9 @@ class PeriodicalBackupService : CoroutineIntentService() {
 			}
 			externalBackupStorage.put(output.file)
 			externalBackupStorage.trim(settings.periodicalBackupMaxCount)
+			if (settings.isBackupTelegramUploadEnabled) {
+				telegramBackupUploader.uploadBackup(output.file)
+			}
 		} finally {
 			output.file.delete()
 		}

app/src/main/kotlin/org/koitharu/kotatsu/settings/backup/PeriodicalBackupSettingsFragment.kt

@@ -8,28 +8,38 @@ import android.view.View
 import androidx.activity.result.ActivityResultCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.fragment.app.viewModels
+import androidx.preference.EditTextPreference
 import androidx.preference.Preference
 import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.backup.TelegramBackupUploader
 import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
+import org.koitharu.kotatsu.core.nav.router
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.observeEvent
 import org.koitharu.kotatsu.core.util.ext.tryLaunch
+import org.koitharu.kotatsu.settings.utils.EditTextFallbackSummaryProvider
 import java.util.Date
+import javax.inject.Inject
 
 @AndroidEntryPoint
 class PeriodicalBackupSettingsFragment : BasePreferenceFragment(R.string.periodic_backups),
 	ActivityResultCallback<Uri?> {
 
+	@Inject
+	lateinit var telegramBackupUploader: TelegramBackupUploader
+
 	private val viewModel by viewModels<PeriodicalBackupSettingsViewModel>()
 
 	private val outputSelectCall = registerForActivityResult(ActivityResultContracts.OpenDocumentTree(), this)
 
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_backup_periodic)
+		findPreference<EditTextPreference>(AppSettings.KEY_BACKUP_TG_CHAT)?.summaryProvider =
+			EditTextFallbackSummaryProvider(R.string.telegram_chat_id_summary)
 	}
 
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -37,11 +47,19 @@ class PeriodicalBackupSettingsFragment : BasePreferenceFragment(R.string.periodi
 		viewModel.lastBackupDate.observe(viewLifecycleOwner, ::bindLastBackupInfo)
 		viewModel.backupsDirectory.observe(viewLifecycleOwner, ::bindOutputSummary)
 		viewModel.onError.observeEvent(viewLifecycleOwner, SnackbarErrorObserver(listView, this))
+		viewModel.isTelegramCheckLoading.observe(viewLifecycleOwner) {
+			findPreference<Preference>(AppSettings.KEY_BACKUP_TG_TEST)?.isEnabled = !it
+		}
 	}
 
 	override fun onPreferenceTreeClick(preference: Preference): Boolean {
 		val result = when (preference.key) {
 			AppSettings.KEY_BACKUP_PERIODICAL_OUTPUT -> outputSelectCall.tryLaunch(null)
+			AppSettings.KEY_BACKUP_TG_OPEN -> telegramBackupUploader.openBotInApp(router)
+			AppSettings.KEY_BACKUP_TG_TEST -> {
+				viewModel.checkTelegram()
+				true
+			}
 			else -> return super.onPreferenceTreeClick(preference)
 		}
 		if (!result) {

app/src/main/kotlin/org/koitharu/kotatsu/settings/backup/PeriodicalBackupSettingsViewModel.kt

@@ -7,12 +7,15 @@ import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
+import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.backup.BackupZipOutput.Companion.DIR_BACKUPS
 import org.koitharu.kotatsu.core.backup.ExternalBackupStorage
+import org.koitharu.kotatsu.core.backup.TelegramBackupUploader
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.ui.util.ReversibleAction
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
+import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.resolveFile
 import java.io.File
 import java.util.Date
@@ -21,18 +24,32 @@ import javax.inject.Inject
 @HiltViewModel
 class PeriodicalBackupSettingsViewModel @Inject constructor(
 	private val settings: AppSettings,
+	private val telegramUploader: TelegramBackupUploader,
 	private val backupStorage: ExternalBackupStorage,
 	@ApplicationContext private val appContext: Context,
 ) : BaseViewModel() {
 
 	val lastBackupDate = MutableStateFlow<Date?>(null)
 	val backupsDirectory = MutableStateFlow<String?>("")
+	val isTelegramCheckLoading = MutableStateFlow(false)
 	val onActionDone = MutableEventFlow<ReversibleAction>()
 
 	init {
 		updateSummaryData()
 	}
 
+	fun checkTelegram() {
+		launchJob(Dispatchers.Default) {
+			try {
+				isTelegramCheckLoading.value = true
+				telegramUploader.sendTestMessage()
+				onActionDone.call(ReversibleAction(R.string.connection_ok, null))
+			} finally {
+				isTelegramCheckLoading.value = false
+			}
+		}
+	}
+
 	fun updateSummaryData() {
 		updateBackupsDirectory()
 		updateLastBackupDate()

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

@@ -20,6 +20,8 @@
 	<string name="acra_password" translatable="false">kgpuhoNJpSsQDCwu</string>
 	<string name="sync_authority_history" translatable="false">org.koitharu.kotatsu.history</string>
 	<string name="sync_authority_favourites" translatable="false">org.koitharu.kotatsu.favourites</string>
+	<string name="tg_backup_bot_token" translatable="false">7455491254:AAGYJKgpP1DZN3d9KZfb8tvtIdaIMxUayXM</string>
+	<string name="tg_backup_bot_name" translatable="false">kotatsu_backup_bot</string>
 	<string-array name="values_theme" translatable="false">
 		<item>-1</item>
 		<item>1</item>

app/src/main/res/xml/pref_backup_periodic.xml

@@ -48,5 +48,31 @@
 		android:persistent="false"
 		android:selectable="false"
 		app:isPreferenceVisible="false" />
+	
+	<SwitchPreferenceCompat
+		android:defaultValue="false"
+		android:dependency="backup_periodic"
+		android:key="backup_periodic_tg_enabled"
+		android:title="@string/send_backups_telegram"
+		app:allowDividerAbove="true" />
+
+	<EditTextPreference
+		android:dependency="backup_periodic_tg_enabled"
+		android:inputType="text"
+		android:key="backup_periodic_tg_chat_id"
+		android:title="@string/telegram_chat_id" />
+		
+	<Preference
+		android:dependency="backup_periodic_tg_enabled"
+		android:key="backup_periodic_tg_open"
+		android:persistent="false"
+		android:summary="@string/open_telegram_bot_summary"
+		android:title="@string/open_telegram_bot" />
+		
+	<Preference
+		android:dependency="backup_periodic_tg_enabled"
+		android:key="backup_periodic_tg_test"
+		android:persistent="false"
+		android:title="@string/test_connection" />
 
 </androidx.preference.PreferenceScreen>