Convert newpipe/util/PeertubeHelper to kotlin

Author: Yevhen Babiichuk (DustDFG)

app/src/main/java/org/schabi/newpipe/util/PeertubeHelper.java

@@ -0,0 +1,56 @@
+/*
+ * SPDX-FileCopyrightText: 2019-2026 NewPipe contributors <https://newpipe.net>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package org.schabi.newpipe.util
+
+import android.content.Context
+import androidx.core.content.edit
+import androidx.preference.PreferenceManager
+import com.grack.nanojson.JsonObject
+import com.grack.nanojson.JsonParser
+import com.grack.nanojson.JsonParserException
+import com.grack.nanojson.JsonWriter
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.ServiceList
+import org.schabi.newpipe.extractor.services.peertube.PeertubeInstance
+
+object PeertubeHelper {
+    @JvmStatic
+    fun getInstanceList(context: Context): List<PeertubeInstance> {
+        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
+        val savedInstanceListKey = context.getString(R.string.peertube_instance_list_key)
+        val savedJson = sharedPreferences.getString(savedInstanceListKey, null)
+        if (savedJson == null) {
+            return listOf(currentInstance)
+        }
+
+        try {
+            return JsonParser.`object`().from(savedJson).getArray("instances")
+                .filterIsInstance<JsonObject>()
+                .map { PeertubeInstance(it.getString("url"), it.getString("name")) }
+        } catch (_: JsonParserException) {
+            return listOf(currentInstance)
+        }
+    }
+
+    @JvmStatic
+    fun selectInstance(instance: PeertubeInstance, context: Context): PeertubeInstance {
+        val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context)
+        val selectedInstanceKey = context.getString(R.string.peertube_selected_instance_key)
+
+        val jsonWriter = JsonWriter.string().`object`()
+        jsonWriter.value("name", instance.name)
+        jsonWriter.value("url", instance.url)
+        val jsonToSave = jsonWriter.end().done()
+
+        sharedPreferences.edit { putString(selectedInstanceKey, jsonToSave) }
+        ServiceList.PeerTube.instance = instance
+        return instance
+    }
+
+    @JvmStatic
+    val currentInstance: PeertubeInstance
+        get() = ServiceList.PeerTube.instance
+}