import { cacheCipher } from '/@/settings/encryptionSetting';
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import type { EncryptionParams } from '/@/utils/cipher';
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import { AesEncryption } from '/@/utils/cipher';
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export interface CreateStorageParams extends EncryptionParams {
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prefixKey: string;
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storage: Storage;
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hasEncrypt: boolean;
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timeout?: Nullable<number>;
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}
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export const createStorage = ({
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prefixKey = '',
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storage = sessionStorage,
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key = cacheCipher.key,
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iv = cacheCipher.iv,
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timeout = null,
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hasEncrypt = true,
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}: Partial<CreateStorageParams> = {}) => {
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if (hasEncrypt && [key.length, iv.length].some((item) => item !== 16)) {
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throw new Error('When hasEncrypt is true, the key or iv must be 16 bits!');
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}
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const encryption = new AesEncryption({ key, iv });
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/**
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*Cache class
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*Construction parameters can be passed into sessionStorage, localStorage,
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* @class Cache
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* @example
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*/
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const WebStorage = class WebStorage {
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private storage: Storage;
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private prefixKey?: string;
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private encryption: AesEncryption;
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private hasEncrypt: boolean;
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/**
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*
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* @param {*} storage
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*/
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constructor() {
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this.storage = storage;
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this.prefixKey = prefixKey;
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this.encryption = encryption;
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this.hasEncrypt = hasEncrypt;
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}
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private getKey(key: string) {
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return `${this.prefixKey}${key}`.toUpperCase();
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}
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/**
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*
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* Set cache
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* @param {string} key
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* @param {*} value
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* @expire Expiration time in seconds
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* @memberof Cache
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*/
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set(key: string, value: any, expire: number | null = timeout) {
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const stringData = JSON.stringify({
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value,
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expire: expire !== null ? new Date().getTime() + expire * 1000 : null,
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});
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const stringifyValue = this.hasEncrypt
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? this.encryption.encryptByAES(stringData)
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: stringData;
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this.storage.setItem(this.getKey(key), stringifyValue);
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}
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/**
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*Read cache
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* @param {string} key
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* @memberof Cache
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*/
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get(key: string, def: any = null): any {
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const item = this.storage.getItem(this.getKey(key));
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if (item) {
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try {
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const decItem = this.hasEncrypt ? this.encryption.decryptByAES(item) : item;
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const data = JSON.parse(decItem);
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const { value, expire } = data;
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if (expire === null || expire >= new Date().getTime()) {
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return value;
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}
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this.remove(this.getKey(key));
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} catch (e) {
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return def;
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}
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}
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return def;
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}
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/**
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* Delete cache based on key
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* @param {string} key
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* @memberof Cache
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*/
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remove(key: string) {
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this.storage.removeItem(this.getKey(key));
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}
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/**
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* Delete all caches of this instance
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*/
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clear(): void {
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this.storage.clear();
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}
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};
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return new WebStorage();
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};
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