Added database for plugins

libs/defaultCover.ts

@@ -1,2 +1,2 @@
 export const defaultCover =
-  'https://github.com/LNReader/lnreader-plugins/blob/main/icons/src/coverNotAvailable.jpg?raw=true';
+  'https://github.com/LNReader/lnreader-plugins/blob/master/icons/coverNotAvailable.webp?raw=true';

libs/storage.ts

@@ -0,0 +1,134 @@
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * Represents a storage system with methods for setting, getting, and deleting key-value pairs.
+ */
+class Storage {
+  private db: Record<
+    string,
+    Record<string, { created: Date; value: any; expires?: number }>
+  >;
+
+  /**
+   * Initializes a new instance of the Storage class.
+   */
+  constructor() {
+    this.db = {};
+  }
+
+  /**
+   * Sets a key-value pair in the storage.
+   *
+   * @param pluginID - The ID of the plugin.
+   * @param key - The key to set.
+   * @param value - The value to set.
+   * @param expires - Optional. The expiration date for the key-value pair.
+   */
+  set(
+    pluginID: string,
+    key: string,
+    value: any,
+    expires?: Date | number,
+  ): void {
+    if (!this.db[pluginID]) this.db[pluginID] = {};
+    this.db[pluginID][key] = {
+      created: new Date(),
+      value,
+      expires: expires instanceof Date ? expires.getTime() : expires,
+    };
+  }
+
+  /**
+   * Gets the value associated with a key from the storage.
+   *
+   * @param pluginID - The ID of the plugin.
+   * @param key - The key to retrieve.
+   * @param raw - Optional. If true, returns the raw storage item object.
+   * @returns The value associated with the key or undefined if not found or expired.
+   */
+  get(pluginID: string, key: string, raw?: boolean): any {
+    const item = this.db[pluginID]?.[key];
+    if (item?.expires && Date.now() > item.expires) {
+      this.delete(pluginID, key);
+      return undefined;
+    }
+    return raw ? item : item?.value;
+  }
+
+  /**
+   * Gets all keys associated with a plugin from the storage.
+   *
+   * @param pluginID - The ID of the plugin.
+   * @returns An array of keys associated with the plugin.
+   */
+  getAllKeys(pluginID: string): string[] {
+    return Object.keys(this.db[pluginID] || {});
+  }
+
+  /**
+   * Deletes a key from the storage.
+   *
+   * @param pluginID - The ID of the plugin.
+   * @param key - The key to delete.
+   */
+  delete(pluginID: string, key: string): void {
+    delete this.db[pluginID]?.[key];
+  }
+
+  /**
+   * Clears all keys associated with a plugin from the storage.
+   *
+   * @param pluginID - The ID of the plugin.
+   */
+  clearAll(pluginID: string): void {
+    delete this.db[pluginID];
+  }
+}
+
+// Export a singleton instance of the Storage class
+export const storage = new Storage();
+
+/*
+These parameters cannot be implemented in `test-web`. 
+They are generated in the browser when js-scripts are executed
+Read more
+
+https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage
+https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage
+*/
+
+/**
+ * Represents the structure of a storage object with string keys and values.
+ */
+interface StorageObject {
+  [key: string]: string | undefined;
+}
+
+/**
+ * Represents a simplified version of the browser's localStorage.
+ */
+class LocalStorage {
+  db: Record<string, StorageObject>;
+
+  /**
+   * Initializes a new instance of the LocalStorage class.
+   */
+  constructor() {
+    this.db = {};
+  }
+
+  /**
+   * Gets the storage object associated with a plugin ID.
+   *
+   * @param pluginID - The ID of the plugin.
+   * @returns The storage object associated with the plugin ID.
+   */
+  get(pluginID: string): StorageObject | undefined {
+    return this.db[pluginID] || {};
+  }
+}
+
+// Export singleton instances of LocalStorage and sessionStorage
+export const localStorage = new LocalStorage();
+export const sessionStorage = new LocalStorage();