Add authData validator && force helprs to use singleton pattern only

Author: whyorean

src/main/java/com/aurora/gplayapi/GooglePlayApi.kt

@@ -215,6 +215,8 @@ class GooglePlayApi(private val authData: AuthData) {
         const val URL_TOC = "$URL_FDFE/toc"
         const val URL_TOS_ACCEPT = "$URL_FDFE/acceptTos"
         const val URL_UPLOAD_DEVICE_CONFIG = "$URL_FDFE/uploadDeviceConfig"
+        const val URL_SYNC = "$URL_FDFE/apps/contentSync"
+        const val URL_SELF_UPDATE = "$URL_FDFE/selfUpdate"
 
         //Not part of Google's API
         const val SALES_URL = "https://www.bestappsale.com/api/android/getsale.php"

src/main/java/com/aurora/gplayapi/helpers/AppDetailsHelper.kt

@@ -28,7 +28,7 @@ import okhttp3.Request
 import okhttp3.RequestBody
 import java.util.*
 
-class AppDetailsHelper(authData: AuthData) : BaseHelper(authData) {
+class AppDetailsHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<AppDetailsHelper, AuthData>(::AppDetailsHelper)
 

src/main/java/com/aurora/gplayapi/helpers/AppSalesHelper.kt

@@ -25,7 +25,7 @@ import com.google.gson.Gson
 import java.io.IOException
 import java.util.*
 
-class AppSalesHelper(authData: AuthData) : BaseHelper(authData) {
+class AppSalesHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<AppSalesHelper, AuthData>(::AppSalesHelper)
 

src/main/java/com/aurora/gplayapi/helpers/AuthHelper.kt

@@ -66,4 +66,6 @@ class AuthHelper {
             return authData
         }
     }
+
+    private constructor()
 }

src/main/java/com/aurora/gplayapi/helpers/AuthValidator.kt

@@ -0,0 +1,33 @@
+/*
+ *     GPlayApi
+ *     Copyright (C) 2020  Aurora OSS
+ *
+ *     This program 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 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program 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.
+ */
+
+package com.aurora.gplayapi.helpers
+
+import com.aurora.gplayapi.GooglePlayApi
+import com.aurora.gplayapi.SingletonHolder
+import com.aurora.gplayapi.data.models.AuthData
+import com.aurora.gplayapi.data.providers.HeaderProvider
+import com.aurora.gplayapi.network.HttpClient
+
+class AuthValidator private constructor(authData: AuthData) : BaseHelper(authData) {
+
+    companion object : SingletonHolder<AuthValidator, AuthData>(::AuthValidator)
+
+    fun isValid(): Boolean {
+        val headers = HeaderProvider.getDefaultHeaders(authData)
+        val playResponse = HttpClient.get(GooglePlayApi.URL_SELF_UPDATE, headers) // OR use contentSync
+        return playResponse.isSuccessful
+    }
+}

src/main/java/com/aurora/gplayapi/helpers/BrowseHelper.kt

@@ -24,7 +24,7 @@ import com.aurora.gplayapi.network.HttpClient
 import java.io.IOException
 import java.util.*
 
-class BrowseHelper(authData: AuthData) : BaseHelper(authData) {
+class BrowseHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<BrowseHelper, AuthData>(::BrowseHelper)
 

src/main/java/com/aurora/gplayapi/helpers/CategoryHelper.kt

@@ -25,7 +25,7 @@ import com.aurora.gplayapi.data.providers.HeaderProvider
 import com.aurora.gplayapi.network.HttpClient
 import java.util.*
 
-class CategoryHelper(authData: AuthData) : BaseHelper(authData) {
+class CategoryHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<CategoryHelper, AuthData>(::CategoryHelper)
 

src/main/java/com/aurora/gplayapi/helpers/ClusterHelper.kt

@@ -23,7 +23,7 @@ import com.aurora.gplayapi.data.providers.HeaderProvider.getDefaultHeaders
 import com.aurora.gplayapi.network.HttpClient
 import java.util.*
 
-class ClusterHelper(authData: AuthData) : BaseHelper(authData) {
+class ClusterHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<ClusterHelper, AuthData>(::ClusterHelper)
 

src/main/java/com/aurora/gplayapi/helpers/PurchaseHelper.kt

@@ -25,7 +25,7 @@ import com.aurora.gplayapi.network.HttpClient
 import java.io.IOException
 import java.util.*
 
-class PurchaseHelper(authData: AuthData) : BaseHelper(authData) {
+class PurchaseHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<PurchaseHelper, AuthData>(::PurchaseHelper)
 

src/main/java/com/aurora/gplayapi/helpers/ReviewsHelper.kt

@@ -26,7 +26,7 @@ import com.aurora.gplayapi.data.providers.HeaderProvider.getDefaultHeaders
 import com.aurora.gplayapi.network.HttpClient
 import java.util.*
 
-class ReviewsHelper(authData: AuthData) : BaseHelper(authData) {
+class ReviewsHelper private constructor(authData: AuthData) : BaseHelper(authData) {
 
     companion object : SingletonHolder<ReviewsHelper, AuthData>(::ReviewsHelper) {
         const val DEFAULT_SIZE = 20