[英]Express - Edit HTML before serving as static server
在我致电expressApp.use(express.static(path.join(__dirname, '/../frontend/dist')));
我需要修改html代码。 我基本上需要做的是在两个中间件函数中插入元标记。 我想出了怎么做。 但是通过我的解决方案,我在另一个内部调用了中间件功能。
let frontend = await fs
.readFileSync(path.join(__dirname, '/../frontend/dist/index.html'))
.toString('utf8');
expressApp.use((req, res, next) => {
//...
frontend = frontend.replace(
'<meta device="ABC" />',
'<head><meta device="' + deviceId + '"/>'
);
next();
});
expressApp.use((req, res, next) => {
const language = req.get('language') || 'en_GB';
logger.info('language:' + language);
this._languageModule.setLanguage(language);
frontend = this._languageModule.insertSIDs(frontend);
logger.info(frontend);
expressApp.use(express.static(path.join(__dirname, '/../frontend/dist'))); // nested middleware function
next();
});
/** set up all the express routes **/
expressApp.get('/', (req, res) => {
res.send(frontend);
});
如果我不打电话给expressApp.use(express.static(path.join(__dirname, '/../frontend/dist')));
嵌套-像这样:
expressApp.use((req, res, next) => {
const language = req.get('language') || 'en_GB';
logger.info('language:' + language);
this._languageModule.setLanguage(language);
frontend = this._languageModule.insertSIDs(frontend);
logger.info(frontend);
next();
});
expressApp.use(express.static(path.join(__dirname, '/../frontend/dist')));
HTML将不会被修改。
您可能应该编写自己的中间件来处理文件的修改。 这是一个未经测试的示例。 但这很粗糙。 它基于express.static
函数
const fs = require("fs");
var parseUrl = require('parseurl')
app.use((req, res, next) => {
var originalUrl = parseUrl.original(req)
var path = parseUrl(req).pathname
// make sure redirect occurs at mount
if (path === '/' && originalUrl.pathname.substr(-1) !== '/') {
path = ''
}
// We only answer to GET
if (req.method !== 'GET' && req.method !== 'HEAD') {
return next()
}
let path = path;
fs.exists(path, (exists) => {
if(!exists)
{
// file don't exists skip this middleware
return next();
}
fs.readFile(path, (err, data) => {
if (err)
{
// Can't send the file skip this middle ware
return next();
}
// Do whatever you need with the file here?
// ...
// Setup mime type of the file
res.setHeader("content-type", "text/html");
// send the client the modified html
res.send(data);
});
console.log(exists ? 'it\'s there' : 'no passwd!');
});
});
对于原始资源,请查看以下github页面: https : //github.com/expressjs/serve-static/blob/master/index.js
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.