@yangshuanlin/y-cache/src/cache.js

加密缓存插件，支持set,get,del,tag,只调试过vue

import sha256 from 'crypto-js/sha256'
import AES from 'crypto-js/aes'
import md5 from 'crypto-js/md5'
import CryptoJS from 'crypto-js'

const Cache = {
  /**
     * 标签分组名称
     */
  tagName: null,
  /**
     * 从缓存获取数据
     * @param {string} key
     * @returns
     */
  get: function(key) {
    key = this.getKey(key)
    let value = localStorage.getItem(key)
    if (value) {
      value = this.decryptValue(key, value)
      if (value.l === 0) {
        return value.d
      } else {
        if (value.l >= this.getNow()) {
          return value.d
        } else {
          return null
        }
      }
    } else {
      return value
    }
  },
  /**
     * 存
     * @param {string} key
     * @param {object|id|string} value
     * @param {int} ttl
     */
  set: function(key, value, ttl = 0) {
    const limitTime = this.getLimitTime(ttl)
    key = this.getKey(key)
    this.setTag(key)
    value = { 'd': value, 'l': limitTime }
    value = this.cryptValue(value, key)
    localStorage.setItem(key, value)
  },
  // 删除
  del: function(key) {
    key = this.getKey(key)
    localStorage.removeItem(key)
  },
  // 分组
  tag: function(tagName) {
    this.tagName = tagName
    return this
  },

  setTag: function(key) {
    if (this.tagName !== null) {
      const tagNameKey = this.getKey(this.tagName)
      let tagValue = localStorage.getItem(tagNameKey)
      if (tagValue) {
        tagValue = JSON.parse(tagValue)
      } else {
        tagValue = []
      }
      tagValue.push(key)
      localStorage.setItem(tagNameKey, JSON.stringify(tagValue))
    }
  },
  clear: function(tagName) {
    const tagNameKey = this.getKey(tagName)
    let tagValue = localStorage.getItem(tagNameKey)
    if (tagValue) {
      tagValue = JSON.parse(tagValue)
      tagValue.map((v) => {
        localStorage.removeItem(v)
      })
      localStorage.removeItem(tagNameKey)
    }
  },
  clearAll: function() {
    localStorage.clear()
  },
  // 获取当前时间戳
  getLimitTime: function(ttl) {
    if (ttl === 0) {
      return 0
    } else {
      return new Date().getTime() + ttl * 1000
    }
  },
  getNow: function() {
    return new Date().getTime()
  },
  // key处理
  getKey: function(key) {
    return md5(key).toString()
  },
  cryptValue: function(value, key) {
    value = JSON.stringify(value)
    const keyAndIv = this.getAesKeyAndIv(key)
    return AES.encrypt(value, keyAndIv.key).toString()
  },
  decryptValue: function(key, value) {
    const keyAndIv = this.getAesKeyAndIv(key)
    const str = AES.decrypt(value, keyAndIv.key).toString(CryptoJS.enc.Utf8)
    return JSON.parse(str)
  },
  getAesKeyAndIv: function(key) {
    const str = sha256(key).toString()
    return { 'key': str.substr(0, 16), 'iv': str.substr(50, 16) }
  }
}
export default Cache