@apicart/js-utils/src/components/LocalStorage.ts

A small set of useful utilities for easier development

import {
	Json,
	Console,
	Objects
} from '.';

interface LocalStorageItemInterface {
	expiration: number;
	value: any;
}

class LocalStorage {

	private _localStorageManager: Record<string, any> = {
		_data: {},
		getItem(key: string|number) {
			return typeof this._data[key] === 'undefined' ? null : this._data[key];
		},
		setItem(key: string|number, value: string|number|null) {
			this._data[key] = value;
		},
		removeItem(key: string|number) {
			delete this._data[key];
		},
		clear() {
			this._data = {};
		},
		key(key: number) {
			return typeof Object.keys(this._data)[key] === 'undefined' ? null : Object.keys(this._data)[key];
		}
	};

	constructor() {
		if (typeof localStorage !== 'undefined') {
			this._localStorageManager = localStorage;
		}
	}

	public clear(): this
	{
		this._localStorageManager.clear();
		return this;
	}

	public getItem(key: string): any | null
	{
		const itemString: string = this._localStorageManager.getItem(key);
		let item: LocalStorageItemInterface | null = null;

		if (itemString) {
			item = Json.parse(itemString);

			if (item.expiration !== null && item.expiration < this.getActualTimestamp()) {
				item = null;
				this.removeItem(key);
			}
		}

		return item === null ? item : item.value;
	}

	public setItem(key: string, value: any, expiration: number | null = null): this
	{
		const item: LocalStorageItemInterface = {
			expiration: expiration ? this.getActualTimestamp() + expiration : null,
			value: value
		};

		try {
			this._localStorageManager.setItem(key, Json.stringify(item));

		} catch (error) {
			Console.error(error);
		}

		return this;
	}

	public updateItem(key, value, expiration: number | null = null): this
	{
		const item = this.getItem(key) || {};
		Objects.merge(item, value);
		this.setItem(key, item, expiration);

		return this;
	}

	public removeItem(key: string): this
	{
		this._localStorageManager.removeItem(key);
		return this;
	}

	public hasItem(key: string): boolean
	{
		return this.getItem(key) !== null;
	}

	public getActualTimestamp(): number
	{
		return new Date().getTime();
	}

}

export default new LocalStorage();