Implement login interception function under Express+Nodejs

This article mainly introduces the login interception implementation code under Express+Nodejs. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor and take a look.

It turned out that I never knew how to add an interceptor similar to Struts2 in Express+Nodejs (because the login interception function is required).

I used to think that adding a similar transfer to the routerroutingcontrol code (each one is very troublesome)

app.get('/show', controllers.checkLogin);//登录验证
app.get('/show', controllers.showList);//实际跳转

Or maybe For example, in some projects, the following verification is added to each controller method (too cumbersome)

if (!req.session.user) {
    return res.redirect("/login");
  }

I recently found a code snippet that used session before, and suddenly I had an enlightenment! !

//session
app.use(function (req, res, next) {
  var err = req.flash('error');
  var success = req.flash('success');
  res.locals({
    user:req.session.user,
    navSide:req.session.navSide,
    error:err.length ? err : null,
    success:success.length ? success : null
  });
  next();
});

Isn’t this just an interceptor~囧~

Slightly modified

//登录拦截器
app.use(function (req, res, next) {
  var url = req.originalUrl;
  if (url != "/login" && !req.session.user) {
    return res.redirect("/login");
  }
  next();
});

After testing, it was successful

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