定制简历浏览器记录缓存加IndexDB存储工具封装,修复同一个页面的不同协议切换问题
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@@ -283,3 +283,267 @@ export function generateResumeWordFile(element: HTMLElement, fileName: string):
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const blob = new Blob([fullHtml], { type: 'application/msword' })
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return new File([blob], `${fileName}.doc`, { type: 'application/msword' })
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}
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// ==================== 定制简历本地缓存(IndexedDB) ====================
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/**
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* 【定制简历缓存机制说明】
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*
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* 由于服务器资源有限,投递流程中生成的岗位专属简历PDF不直接上传到OSS,
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* 而是以 Blob 形式缓存到浏览器 IndexedDB 中(空间可达几百MB,远大于 localStorage 的 5~10MB)。
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*
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* 存储结构:
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* - 索引记录数组:localStorage key = "CUSTOM_RESUME_CACHE_INDEX"
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* 存储 CachedResumeRecord[] 数组的 JSON 字符串(几百字节,不占空间),每条记录包含:
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* userId(用户ID)、jobId(岗位ID)、fileName(雪花ID文件名)、
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* storageKey(简历文件在 IndexedDB 中的 key)、localDateTime(存储时间)
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*
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* - 简历文件数据:IndexedDB 数据库名 = "ResumeFileCache",对象仓库名 = "files"
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* 以 storageKey 为主键,直接存储 PDF 的 Blob 对象(无需 Base64 编码,不膨胀体积)
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*
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* 使用方式:
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* 1. 存储:调用 cacheResumePdfToLocal(element, userId, jobId) 生成PDF并缓存到IndexedDB
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* 2. 查询:调用 getCachedResumeRecord(userId, jobId) 通过用户ID+岗位ID获取缓存记录
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* 3. 取文件:调用 getCachedResumeFile(storageKey) 通过记录中的 storageKey 从IndexedDB获取 File 对象
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* 4. 清理:调用 clearExpiredResumeCache(maxAgeDays) 清理过期缓存
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*
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* 优势:
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* - IndexedDB 直接存 Blob,不需要 Base64 编码,文件体积不膨胀
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* - 空间充足(几百MB~GB级),不会像 localStorage 那样容易满
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* - 取出来就是 Blob,直接 new File([blob], name) 即可当文件使用
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*/
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/** 定制简历缓存索引记录 */
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export interface CachedResumeRecord {
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/** 系统用户ID */
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userId: string
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/** 对应岗位ID */
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jobId: string
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/** 缓存的简历文件名(雪花ID格式,不含扩展名) */
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fileName: string
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/** 简历文件在 IndexedDB 中的存储 key */
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storageKey: string
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/** 存储时间(ISO 8601 格式) */
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localDateTime: string
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}
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/** 缓存索引在 localStorage 中的 key(仅存索引JSON,体积极小) */
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const CACHE_INDEX_KEY = 'CUSTOM_RESUME_CACHE_INDEX'
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/** IndexedDB 数据库名 */
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const IDB_NAME = 'ResumeFileCache'
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/** IndexedDB 对象仓库名 */
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const IDB_STORE = 'files'
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/** IndexedDB 版本号 */
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const IDB_VERSION = 1
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/**
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* 打开 IndexedDB 数据库连接
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* @returns IDBDatabase 实例
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*/
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function openResumeDB(): Promise<IDBDatabase> {
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return new Promise((resolve, reject) => {
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const request = indexedDB.open(IDB_NAME, IDB_VERSION)
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request.onupgradeneeded = () => {
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const db = request.result
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// 创建对象仓库(如果不存在)
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if (!db.objectStoreNames.contains(IDB_STORE)) {
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db.createObjectStore(IDB_STORE)
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}
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}
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request.onsuccess = () => resolve(request.result)
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request.onerror = () => reject(request.error)
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})
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}
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/**
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* 向 IndexedDB 写入 Blob 数据
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* @param key 存储键
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* @param blob 文件 Blob
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*/
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async function idbPut(key: string, blob: Blob): Promise<void> {
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const db = await openResumeDB()
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return new Promise((resolve, reject) => {
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const tx = db.transaction(IDB_STORE, 'readwrite')
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const store = tx.objectStore(IDB_STORE)
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const request = store.put(blob, key)
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request.onsuccess = () => resolve()
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request.onerror = () => reject(request.error)
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tx.oncomplete = () => db.close()
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})
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}
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/**
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* 从 IndexedDB 读取 Blob 数据
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* @param key 存储键
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* @returns Blob 对象,未找到返回 null
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*/
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async function idbGet(key: string): Promise<Blob | null> {
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const db = await openResumeDB()
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return new Promise((resolve, reject) => {
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const tx = db.transaction(IDB_STORE, 'readonly')
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const store = tx.objectStore(IDB_STORE)
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const request = store.get(key)
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request.onsuccess = () => resolve(request.result || null)
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request.onerror = () => reject(request.error)
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tx.oncomplete = () => db.close()
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})
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}
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/**
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* 从 IndexedDB 删除指定 key 的数据
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* @param key 存储键
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*/
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async function idbDelete(key: string): Promise<void> {
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const db = await openResumeDB()
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return new Promise((resolve, reject) => {
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const tx = db.transaction(IDB_STORE, 'readwrite')
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const store = tx.objectStore(IDB_STORE)
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const request = store.delete(key)
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request.onsuccess = () => resolve()
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request.onerror = () => reject(request.error)
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tx.oncomplete = () => db.close()
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})
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}
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/**
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* 生成简单的雪花ID(基于时间戳 + 随机数,保证不重复)
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* @returns 雪花ID字符串
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*/
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function generateSnowflakeId(): string {
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const timestamp = Date.now().toString(36)
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const random = Math.random().toString(36).substring(2, 10)
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return `${timestamp}${random}`
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}
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/**
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* 获取缓存索引记录数组(从 localStorage 读取)
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* @returns 缓存记录数组
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*/
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function getCacheIndex(): CachedResumeRecord[] {
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try {
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const raw = localStorage.getItem(CACHE_INDEX_KEY)
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return raw ? JSON.parse(raw) : []
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} catch {
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return []
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}
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}
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/**
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* 保存缓存索引记录数组(写入 localStorage)
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* @param records 缓存记录数组
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*/
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function saveCacheIndex(records: CachedResumeRecord[]) {
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localStorage.setItem(CACHE_INDEX_KEY, JSON.stringify(records))
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}
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/**
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* 将简历PDF生成并缓存到浏览器 IndexedDB
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* @param element 简历DOM元素
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* @param userId 当前用户ID
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* @param jobId 对应岗位ID
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* @returns 缓存记录(包含 storageKey 等信息),存储失败返回 null
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*/
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export async function cacheResumePdfToLocal(
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element: HTMLElement,
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userId: string,
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jobId: string,
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): Promise<CachedResumeRecord | null> {
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try {
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// 生成雪花ID作为文件名
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const snowflakeId = generateSnowflakeId()
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const storageKey = `resume_${snowflakeId}`
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// 生成PDF Blob
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const options = {
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margin: [10, 10, 10, 10] as [number, number, number, number],
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filename: `${snowflakeId}.pdf`,
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image: { type: 'jpeg' as const, quality: 0.98 },
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html2canvas: { scale: 2, useCORS: true, logging: false },
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jsPDF: { unit: 'mm', format: 'a4', orientation: 'portrait' as const },
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pagebreak: { mode: ['css', 'legacy'] },
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}
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const blob: Blob = await html2pdf().set(options).from(element).outputPdf('blob')
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// 将 Blob 直接存入 IndexedDB(无需 Base64 编码)
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await idbPut(storageKey, blob)
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// 构建缓存记录
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const record: CachedResumeRecord = {
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userId,
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jobId,
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fileName: snowflakeId,
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storageKey,
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localDateTime: new Date().toISOString(),
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}
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// 更新索引(如果同一用户+岗位已有记录,先移除旧的)
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const index = getCacheIndex()
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const existIdx = index.findIndex(r => r.userId === userId && r.jobId === jobId)
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if (existIdx !== -1) {
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// 删除旧的 IndexedDB 文件缓存
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await idbDelete(index[existIdx].storageKey)
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index.splice(existIdx, 1)
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}
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index.push(record)
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saveCacheIndex(index)
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return record
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} catch (e) {
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console.error('[resumeExport] 缓存简历到IndexedDB失败', e)
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return null
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}
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}
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/**
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* 通过用户ID和岗位ID查询缓存记录
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* @param userId 用户ID
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* @param jobId 岗位ID
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* @returns 缓存记录,未找到返回 null
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*/
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export function getCachedResumeRecord(userId: string, jobId: string): CachedResumeRecord | null {
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const index = getCacheIndex()
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return index.find(r => r.userId === userId && r.jobId === jobId) || null
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}
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/**
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* 通过 storageKey 从 IndexedDB 获取缓存的简历 File 对象
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* @param storageKey 缓存记录中的 storageKey
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* @param fileName 可选,指定输出文件名(不含扩展名),默认用 storageKey 中的雪花ID
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* @returns PDF格式的 File 对象,未找到返回 null
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*/
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export async function getCachedResumeFile(storageKey: string, fileName?: string): Promise<File | null> {
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try {
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const blob = await idbGet(storageKey)
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if (!blob) return null
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const name = fileName || storageKey.replace('resume_', '')
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return new File([blob], `${name}.pdf`, { type: 'application/pdf' })
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} catch {
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return null
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}
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}
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/**
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* 清理过期的简历缓存
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* @param maxAgeDays 最大保留天数,默认7天
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*/
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export async function clearExpiredResumeCache(maxAgeDays = 7) {
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const index = getCacheIndex()
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const now = Date.now()
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const maxAgeMs = maxAgeDays * 24 * 60 * 60 * 1000
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const validRecords: CachedResumeRecord[] = []
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for (const record of index) {
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const recordTime = new Date(record.localDateTime).getTime()
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if (now - recordTime > maxAgeMs) {
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// 过期,删除 IndexedDB 中的文件缓存
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await idbDelete(record.storageKey)
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} else {
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validRecords.push(record)
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}
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}
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saveCacheIndex(validRecords)
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}
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