Add UI functionality for importing and exporting playlists

app/src/main/java/com/github/libretube/api/PlaylistsHelper.kt

@@ -14,6 +14,7 @@ import com.github.libretube.extensions.awaitQuery
 import com.github.libretube.extensions.toLocalPlaylistItem
 import com.github.libretube.extensions.toStreamItem
 import com.github.libretube.extensions.toastFromMainThread
+import com.github.libretube.obj.ImportPlaylist
 import com.github.libretube.util.PreferenceHelper
 import com.github.libretube.util.ProxyHelper
 import retrofit2.HttpException
@@ -175,6 +176,14 @@ object PlaylistsHelper {
         )
     }
 
+    suspend fun importPlaylists(playlist: List<ImportPlaylist>) {
+
+    }
+
+    suspend fun exportPlaylists(): List<ImportPlaylist> {
+
+    }
+
     fun getPrivateType(): PlaylistType {
         return if (loggedIn()) PlaylistType.PRIVATE else PlaylistType.LOCAL
     }

app/src/main/java/com/github/libretube/constants/PreferenceKeys.kt

@@ -49,8 +49,6 @@ object PreferenceKeys {
     const val CLEAR_CUSTOM_INSTANCES = "clearCustomInstances"
     const val LOGIN_REGISTER = "login_register"
     const val DELETE_ACCOUNT = "delete_account"
-    const val IMPORT_SUBS = "import_from_yt"
-    const val EXPORT_SUBS = "export_subs"
 
     /**
      * Player

app/src/main/java/com/github/libretube/ui/preferences/BackupRestoreSettings.kt

@@ -7,7 +7,6 @@ import androidx.activity.result.contract.ActivityResultContracts
 import androidx.activity.result.contract.ActivityResultContracts.CreateDocument
 import androidx.preference.Preference
 import com.github.libretube.R
-import com.github.libretube.constants.PreferenceKeys
 import com.github.libretube.obj.BackupFile
 import com.github.libretube.ui.base.BasePreferenceFragment
 import com.github.libretube.ui.dialogs.BackupDialog
@@ -29,19 +28,35 @@ class BackupRestoreSettings : BasePreferenceFragment() {
     private lateinit var getSubscriptionsFile: ActivityResultLauncher<String>
     private lateinit var createSubscriptionsFile: ActivityResultLauncher<String>
 
+    /**
+     * result listeners for importing and exporting playlists
+     */
+    private lateinit var getPlaylistsFile: ActivityResultLauncher<String>
+    private lateinit var createPlaylistsFile: ActivityResultLauncher<String>
+
     override fun onCreate(savedInstanceState: Bundle?) {
         getSubscriptionsFile =
             registerForActivityResult(
                 ActivityResultContracts.GetContent()
-            ) { uri: Uri? ->
+            ) { uri ->
                 ImportHelper(requireActivity()).importSubscriptions(uri)
             }
         createSubscriptionsFile = registerForActivityResult(
             CreateDocument("application/json")
-        ) { uri: Uri? ->
+        ) { uri ->
             ImportHelper(requireActivity()).exportSubscriptions(uri)
         }
 
+        getPlaylistsFile = registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
+            ImportHelper(requireActivity()).importPlaylists(uri)
+        }
+
+        createPlaylistsFile = registerForActivityResult(
+            CreateDocument("application/json")
+        ) { uri ->
+            ImportHelper(requireActivity()).exportPlaylists(uri)
+        }
+
         getBackupFile =
             registerForActivityResult(
                 ActivityResultContracts.GetContent()
@@ -61,19 +76,30 @@ class BackupRestoreSettings : BasePreferenceFragment() {
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.import_export_settings, rootKey)
 
-        val importSubscriptions = findPreference<Preference>(PreferenceKeys.IMPORT_SUBS)
+        val importSubscriptions = findPreference<Preference>("import_subscriptions")
         importSubscriptions?.setOnPreferenceClickListener {
-            // check StorageAccess
             getSubscriptionsFile.launch("*/*")
             true
         }
 
-        val exportSubscriptions = findPreference<Preference>(PreferenceKeys.EXPORT_SUBS)
+        val exportSubscriptions = findPreference<Preference>("export_subscriptions")
         exportSubscriptions?.setOnPreferenceClickListener {
             createSubscriptionsFile.launch("subscriptions.json")
             true
         }
 
+        val importPlaylists = findPreference<Preference>("import_playlists")
+        importPlaylists?.setOnPreferenceClickListener {
+            getPlaylistsFile.launch("*/*")
+            true
+        }
+
+        val exportPlaylists = findPreference<Preference>("export_playlists")
+        exportPlaylists?.setOnPreferenceClickListener {
+            createPlaylistsFile.launch("subscriptions.json")
+            true
+        }
+
         val advancesBackup = findPreference<Preference>("backup")
         advancesBackup?.setOnPreferenceClickListener {
             BackupDialog {

app/src/main/java/com/github/libretube/util/ImportHelper.kt

@@ -6,10 +6,12 @@ import android.util.Log
 import android.widget.Toast
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.github.libretube.R
+import com.github.libretube.api.PlaylistsHelper
 import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.SubscriptionHelper
 import com.github.libretube.extensions.TAG
 import com.github.libretube.extensions.toastFromMainThread
+import com.github.libretube.obj.ImportPlaylistFile
 import com.github.libretube.obj.NewPipeSubscription
 import com.github.libretube.obj.NewPipeSubscriptions
 import kotlinx.coroutines.CoroutineScope
@@ -36,12 +38,10 @@ class ImportHelper(
             }
         } catch (e: IllegalArgumentException) {
             Log.e(TAG(), e.toString())
-            Toast.makeText(
+            activity.toastFromMainThread(
-                activity,
                 activity.getString(R.string.unsupported_file_format) +
-                    " (${activity.contentResolver.getType(uri)}",
+                    " (${activity.contentResolver.getType(uri)}"
-                Toast.LENGTH_SHORT
+            )
-            ).show()
         } catch (e: Exception) {
             Log.e(TAG(), e.toString())
             Toast.makeText(activity, e.localizedMessage, Toast.LENGTH_SHORT).show()
@@ -55,12 +55,7 @@ class ImportHelper(
         return when (val fileType = activity.contentResolver.getType(uri)) {
             "application/json", "application/octet-stream" -> {
                 // NewPipe subscriptions format
-                val mapper = ObjectMapper()
+                val subscriptions = ObjectMapper().readValue(uri.readText(), NewPipeSubscriptions::class.java)
-                val json = activity.contentResolver.openInputStream(uri)?.use {
-                    it.bufferedReader().use { reader -> reader.readText() }
-                }.orEmpty()
-
-                val subscriptions = mapper.readValue(json, NewPipeSubscriptions::class.java)
                 subscriptions.subscriptions.orEmpty().map {
                     it.url!!.replace("https://www.youtube.com/channel/", "")
                 }
@@ -84,12 +79,9 @@ class ImportHelper(
      */
     fun exportSubscriptions(uri: Uri?) {
         if (uri == null) return
-        try {
-            val mapper = ObjectMapper()
-            val token = PreferenceHelper.getToken()
         runBlocking {
-                val subs = if (token != "") {
+            val subs = if (PreferenceHelper.getToken() != "") {
-                    RetrofitInstance.authApi.subscriptions(token)
+                RetrofitInstance.authApi.subscriptions(PreferenceHelper.getToken())
             } else {
                 RetrofitInstance.authApi.unauthenticatedSubscriptions(
                     SubscriptionHelper.getFormattedLocalSubscriptions()
@@ -108,16 +100,64 @@ class ImportHelper(
                 subscriptions = newPipeChannels
             )
 
-                val data = mapper.writeValueAsBytes(newPipeSubscriptions)
+            uri.write(newPipeSubscriptions)
 
-                activity.contentResolver.openFileDescriptor(uri, "w")?.use {
+            activity.toastFromMainThread(R.string.exportsuccess)
+        }
+    }
+
+    /**
+     * Import Playlists
+     */
+    fun importPlaylists(uri: Uri?) {
+        if (uri == null) return
+
+        val playlistFile = ObjectMapper().readValue(uri.readText(), ImportPlaylistFile::class.java)
+
+        playlistFile.playlists.orEmpty().forEach {
+            CoroutineScope(Dispatchers.IO).launch {
+                playlistFile.playlists?.let {
+                    PlaylistsHelper.importPlaylists(it)
+                }
+            }
+        }
+
+        activity.toastFromMainThread(R.string.importsuccess)
+    }
+
+    /**
+     * Export Playlists
+     */
+    fun exportPlaylists(uri: Uri?) {
+        if (uri == null) return
+
+        runBlocking {
+            val playlists = PlaylistsHelper.exportPlaylists()
+            val playlistFile = ImportPlaylistFile(
+                format = "Piped",
+                version = 1,
+                playlists = playlists
+            )
+
+            uri.write(playlistFile)
+
+            activity.toastFromMainThread(R.string.exportsuccess)
+        }
+    }
+
+    private fun Uri.readText(): String {
+        return activity.contentResolver.openInputStream(this)?.use {
+            it.bufferedReader().use { reader -> reader.readText() }
+        }.orEmpty()
+    }
+
+    private fun Uri.write(text: Any) {
+        activity.contentResolver.openFileDescriptor(this, "w")?.use {
             FileOutputStream(it.fileDescriptor).use { fileOutputStream ->
-                        fileOutputStream.write(data)
+                fileOutputStream.write(
+                    ObjectMapper().writeValueAsBytes(text)
+                )
             }
         }
     }
-        } catch (e: Exception) {
-            e.printStackTrace()
-        }
-    }
 }

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

@@ -406,7 +406,8 @@
     <string name="import_playlists">Import playlists</string>
     <string name="export_playlists">Export playlists</string>
     <string name="app_backup">App Backup</string>
-    <string name="backup_restore_summary">Import &amp; export subscriptions, playlists, ...</string>
+    <string name="backup_restore_summary">Import &amp; export subscriptions, playlists, …</string>
+    <string name="exportsuccess">Successfully exported!</string>
 
     <!-- Notification channel strings -->
     <string name="download_channel_name">Download Service</string>

app/src/main/res/xml/import_export_settings.xml

@@ -7,12 +7,12 @@
         <Preference
             android:icon="@drawable/ic_download_filled"
             android:summary="@string/import_from_yt_summary"
-            app:key="import_from_yt"
+            app:key="import_subscriptions"
             app:title="@string/import_from_yt" />
 
         <Preference
             android:icon="@drawable/ic_upload"
-            app:key="export_subs"
+            app:key="export_subscriptions"
             app:title="@string/export_subscriptions" />
 
     </PreferenceCategory>
@@ -22,12 +22,12 @@
         <Preference
             android:icon="@drawable/ic_download_filled"
             android:summary="@string/import_playlists"
-            app:key="import_from_yt"
+            app:key="import_playlists"
             app:title="@string/import_from_yt" />
 
         <Preference
             android:icon="@drawable/ic_upload"
-            app:key="export_subs"
+            app:key="export_playlists"
             app:title="@string/export_playlists" />
 
     </PreferenceCategory>