新增工作区下载列表
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284
utils/downloadManager.js
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284
utils/downloadManager.js
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/**
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* 下载管理工具
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* 文件保存到公共下载目录，用户可通过文件管理器访问
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*/
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const STORAGE_KEY = 'localDownloads'
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const SUB_DIR = 'AppDownloads' // 公共下载目录下的子文件夹
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/**
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* 获取公共下载目录路径
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* @returns {Promise<string>} 下载目录绝对路径
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*/
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function getPublicDownloadDir() {
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return new Promise((resolve, reject) => {
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// #ifdef APP-PLUS
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plus.io.requestFileSystem(
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plus.io.PUBLIC_DOWNLOADS,
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(fs) => {
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// PUBLIC_DOWNLOADS 对应 /storage/emulated/0/Download/
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fs.root.getDirectory(
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SUB_DIR,
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{ create: true },
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(dirEntry) => {
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resolve(dirEntry.fullPath)
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},
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(err) => {
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console.error('getDirectory failed:', err)
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reject(err)
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}
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)
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},
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(err) => {
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console.error('requestFileSystem failed:', err)
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reject(err)
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}
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)
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// #endif
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// #ifndef APP-PLUS
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reject(new Error('仅APP端支持'))
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// #endif
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})
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}
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/**
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* 从完整路径中提取可读的显示路径
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* 如 /storage/emulated/0/Download/AppDownloads/xxx.pdf → 下载/AppDownloads/xxx.pdf
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*/
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function getDisplayPath(fullPath) {
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const idx = fullPath.indexOf('/Download/')
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if (idx !== -1) {
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return '下载/' + fullPath.slice(idx + 10)
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}
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return fullPath
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}
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/**
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* 获取所有下载记录
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* @returns {Array} 下载记录列表
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*/
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export function getDownloadList() {
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try {
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return uni.getStorageSync(STORAGE_KEY) || []
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} catch (e) {
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return []
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}
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}
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/**
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* 保存下载记录（复制到公共下载目录）
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* @param {string} tempFilePath 临时文件路径（uni.downloadFile 返回的）
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* @param {string} fileName 文件名
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* @param {number} fileSize 文件大小（字节，可选）
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*/
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export function saveDownload(tempFilePath, fileName, fileSize) {
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return new Promise((resolve, reject) => {
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// #ifdef APP-PLUS
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getPublicDownloadDir().then((dirPath) => {
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const destPathForUrl = plus.io.convertLocalFileSystemURL(dirPath + '/' + fileName)
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plus.io.resolveLocalFileSystemURL(
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tempFilePath,
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(fileEntry) => {
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plus.io.resolveLocalFileSystemURL(
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dirPath,
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(dirEntry) => {
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fileEntry.copyTo(
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dirEntry,
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fileName,
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() => {
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const record = {
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id: Date.now().toString(),
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name: fileName,
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path: destPathForUrl,
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displayPath: getDisplayPath(destPathForUrl),
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size: fileSize || 0,
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time: Date.now()
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}
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const list = getDownloadList()
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const exists = list.some(item => item.name === fileName)
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if (exists) {
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const idx = list.findIndex(item => item.name === fileName)
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if (idx !== -1) list.splice(idx, 1)
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}
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list.unshift(record)
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try {
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uni.setStorageSync(STORAGE_KEY, list)
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} catch (e) {
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list.pop()
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uni.setStorageSync(STORAGE_KEY, list)
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}
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resolve(record)
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},
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(err) => {
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console.error('copyTo failed:', err)
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reject(err)
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}
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)
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},
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reject
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)
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},
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reject
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)
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}).catch(reject)
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// #endif
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// #ifndef APP-PLUS
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// 非 APP 端降级使用 uni.saveFile
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uni.saveFile({
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tempFilePath: tempFilePath,
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success: (saveRes) => {
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const record = {
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id: Date.now().toString(),
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name: fileName,
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path: saveRes.savedFilePath,
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size: fileSize || 0,
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time: Date.now()
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}
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const list = getDownloadList()
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list.unshift(record)
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uni.setStorageSync(STORAGE_KEY, list)
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resolve(record)
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},
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fail: reject
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})
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// #endif
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})
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}
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/**
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* 删除单条下载记录及其文件
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* @param {string} id 记录 ID
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*/
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export function deleteDownload(id) {
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return new Promise((resolve, reject) => {
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const list = getDownloadList()
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const record = list.find(item => item.id === id)
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if (!record) {
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reject(new Error('记录不存在'))
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return
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}
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// #ifdef APP-PLUS
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// 删除公共目录下的文件
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plus.io.resolveLocalFileSystemURL(
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record.path,
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(fileEntry) => {
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fileEntry.remove(
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() => {
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const newList = list.filter(item => item.id !== id)
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uni.setStorageSync(STORAGE_KEY, newList)
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resolve()
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},
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() => {
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// 文件不存在也清除记录
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const newList = list.filter(item => item.id !== id)
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uni.setStorageSync(STORAGE_KEY, newList)
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resolve()
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}
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)
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},
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() => {
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// 无法解析路径，直接清除记录
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const newList = list.filter(item => item.id !== id)
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uni.setStorageSync(STORAGE_KEY, newList)
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resolve()
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}
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)
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// #endif
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// #ifndef APP-PLUS
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uni.removeSavedFile({
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filePath: record.path,
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success: () => {
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const newList = list.filter(item => item.id !== id)
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uni.setStorageSync(STORAGE_KEY, newList)
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resolve()
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},
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fail: () => {
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const newList = list.filter(item => item.id !== id)
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uni.setStorageSync(STORAGE_KEY, newList)
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resolve()
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}
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})
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// #endif
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})
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}
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/**
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* 清空所有下载记录和文件
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*/
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export function clearAllDownloads() {
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return new Promise((resolve) => {
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const list = getDownloadList()
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if (list.length === 0) {
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resolve()
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return
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}
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// #ifdef APP-PLUS
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let count = 0
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const done = () => {
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count++
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if (count >= list.length) {
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uni.setStorageSync(STORAGE_KEY, [])
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resolve()
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}
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}
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list.forEach(record => {
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plus.io.resolveLocalFileSystemURL(
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record.path,
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(fileEntry) => {
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fileEntry.remove(done, done)
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},
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done
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)
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})
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setTimeout(() => {
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uni.setStorageSync(STORAGE_KEY, [])
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resolve()
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}, 5000)
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// #endif
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// #ifndef APP-PLUS
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let count = 0
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list.forEach(record => {
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uni.removeSavedFile({
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filePath: record.path,
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success: () => { count++; if (count >= list.length) { uni.setStorageSync(STORAGE_KEY, []); resolve() } },
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fail: () => { count++; if (count >= list.length) { uni.setStorageSync(STORAGE_KEY, []); resolve() } }
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})
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})
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if (list.length === 0) resolve()
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setTimeout(() => { uni.setStorageSync(STORAGE_KEY, []); resolve() }, 3000)
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// #endif
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})
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}
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/**
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* 格式化文件大小为可读字符串
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* @param {number} bytes 字节数
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* @returns {string}
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*/
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export function formatFileSize(bytes) {
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if (!bytes || bytes <= 0) return '未知大小'
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const units = ['B', 'KB', 'MB', 'GB']
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let i = 0
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let size = bytes
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while (size >= 1024 && i < units.length - 1) {
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size /= 1024
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i++
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}
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return size.toFixed(i === 0 ? 0 : 1) + ' ' + units[i]
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}
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/**
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* 格式化时间戳为可读日期
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* @param {number} timestamp
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* @returns {string}
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*/
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export function formatTime(timestamp) {
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const d = new Date(timestamp)
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const pad = n => String(n).padStart(2, '0')
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return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`
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}
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