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需求场景

获取网站点击的下载pdf，并把pdf重命名再上传到COS云上面

技术使用

“puppeteer”: “^19.7.2”,
“egg”: “^3.15.0”, // 服务期用egg搭的
文件服务使用COS腾讯云

核心思路

获取浏览器下载事件，并把文件保存到本地

const session = await substitutePage.target().createCDPSession();await session.send('Page.setDownloadBehavior', {behavior: 'allow',downloadPath, // 指定文件保存路径回家});

在保存到本地前监听此文件夹，如果有文件则获取并上传
加timer做防抖是为了防止在文件写入时以及重命名文件时多次触发watch函数，导致出会出现0KB源文件脏数据

 let timer: any = null;fs.watch(downloadPath, async (_eventType, filename) => {if (timer !== null) {clearTimeout(timer);}timer = setTimeout(() => {// 防止出现下载的临时文件就触发if (filename.endsWith('.pdf')) {resolve({filename,});}}, 500);});

完整代码

    const session = await substitutePage.target().createCDPSession();await session.send('Page.setDownloadBehavior', {behavior: 'allow',downloadPath, // 指定文件保存路径回家});// res就是文件相关信息了const [ res ] = await this.downloadPdfHandler(substitutePage, downloadPath);// filePath就是自己本地的文件所在绝对路径const filePath = `${downloadPath}/${res.fileName}`;// uploadFile是cos文件上传相关实现， 我就不放了，有私密的keyconst pdfUriCode = await this.uploadFile(filePath, filePath);const pdfUri = decodeURIComponent(pdfUriCode);this.domainList = {pdfSize: res.pdfSize,pdfUri: pdfUri.substring(pdfUri.indexOf('root')),};

downloadPdfHandler函数实现

  downloadPdfHandler(page, downloadPath): Promise<any> {const uuidName = uuidv4();const fsWatchApi = () => {// 使用防抖是为了防止下载的文件没有写入完全就重命名，那样会产生一个脏文件let timer: any = null;return new Promise<{ filename: string }>(resolve => {fs.watch(downloadPath, async (_eventType, filename) => {if (timer !== null) {clearTimeout(timer);}timer = setTimeout(() => {// 防止出现下载的临时文件就触发if (filename.endsWith('.pdf')) {resolve({filename,});}}, 500);});});};function responseWatchApi() {return new Promise<void>(resolve => {page.on('response', async response => {// 检查响应是否为application/octet-stream且可能包含PDF（或你期望的其他文件类型）if (response.headers()['content-type'].startsWith('application/octet-stream')) {resolve();}});});}return new Promise(async (resolve, reject) => {try {const [ , { filename }] = await Promise.all([ responseWatchApi(), fsWatchApi() ]);const oldFilePath = path.join(downloadPath, filename);const newFilePath = path.join(downloadPath, `${uuidName}.pdf`);try {fs.renameSync(oldFilePath, newFilePath);this.logger.info(`文件名已经被修改完成:${uuidName}`);} catch (error) {this.logger.info(`文件名已经被修改完成:${uuidName}`);}await this.sleep(5 * 1000);const files = fs.readdirSync(downloadPath);// 创建一个数组，将文件名和其mtime（最后修改时间）一起存储const filesWithMtime = files.map(file => {const filePath = path.join(downloadPath, file);const stats = fs.statSync(filePath);return { fileName: file, mtime: stats.mtime, size: stats.size };});const newestFile = filesWithMtime.sort((a, b) => b.mtime.getTime() - a.mtime.getTime())[0];this.logger.info('newestFile: %o', {newestFile,});resolve({pdfSize: newestFile.size,fileName: newestFile.fileName,});} catch (e) {reject(e);}});}