Introduce "BaseClient"

src/lib/requests/client/BaseClient.ts

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import storage from '@/util/localStorage.tsx';
+
+// eslint-disable-next-line import/prefer-default-export
+export abstract class BaseClient<Client, ClientConfig, Fetcher> {
+    protected client!: Client;
+
+    public abstract readonly fetcher: Fetcher;
+
+    constructor() {
+        this.createClient();
+    }
+
+    public getBaseUrl(): string {
+        const { hostname, port, protocol } = window.location;
+
+        // if port is 3000 it's probably running from webpack development server
+        const inferredPort = port === '3000' ? '4567' : port;
+        return storage.getItem('serverBaseURL', `${protocol}//${hostname}:${inferredPort}`);
+    }
+
+    protected abstract createClient(): void;
+
+    public abstract updateConfig(config: Partial<ClientConfig>): void;
+}