Node.js 在 express.js/passport.js 中将参数传递给我的 require function？ 明白为什么？

Question

大家好，我需要一些帮助来理解 node.js 语法。 该应用程序已将参数放在要求 function 上，该要求需要另一个文件（不是模块）的路径。 让我举一个我正在谈论的语法示例，它位于名为 server.js 的主 javascript 文件中。

require('./config/passport')(passport);

和

require('./app/routes.js')(app, passport);

我需要知道为什么将这些“app”和“passport”参数传递给我的 require function。app 是 express 而 passport 是护照模块。

完整的相关文件如下。 干杯

 var express = require('express'); var app = express(); var port = process.env.PORT || 8080; var mongoose = require('mongoose'); var passport = require('passport'); var flash = require('connect-flash'); require('./app/models/user'); var morgan = require('morgan'); var cookieParser = require('cookie-parser'); var bodyParser = require('body-parser'); var session = require('express-session'); var configDB = require('./config/database.js'); mongoose.connect(configDB.url); require('./config/passport')(passport); app.use(morgan('dev')); //http request logger app.use(cookieParser()); //reads cookies (needed for authentication) app.use(bodyParser()); //gets information from html forms app.set('view engine', 'ejs'); //required for passport app.use(session({secret: 'jonathanisawesome'})); app.use(passport.initialize()); app.use(passport.session()); //persistent login sessions app.use(flash()); //connect-flash for flash messages stored in sessions //routes require('./app/routes.js')(app, passport); //loads our routes and passes in our app and fully configured passport app.listen(port); console.log('the magix happens on port ' + port);

 app.get('/logout', function(req,res){ req.logout(); res.redirect('/'); }); //processing of the form app.post('/login', passport.authenticate('local-login', { successRedirect: '/profile', failureRedirect: '/login', failureFlash: true })); app.post('/signup', passport.authenticate('local-signup', { successRedirect: '/profile', failureRedirect: '/signup', failureFlash: true })); // route for facebook authentication and login app.get('/auth/facebook', passport.authenticate('facebook', { scope: 'email' })); // handle the callback after facebook has authenticated the user app.get('/auth/facebook/callback', passport.authenticate('facebook', { successRedirect: '/profile', failureRedirect: '/' })); app.get('/auth/google', passport.authenticate('google', { scope: ['profile', 'email'] })); // the callback after google has authenticated the user app.get('/auth/google/callback', passport.authenticate('google', { successRedirect: '/profile', failureRedirect: '/' })); }; //route middleware to make sure a user is logged in function isLoggedIn(req,res,next){ //if user is authenticated in the session, carry on if(req.isAuthenticated()) return next(); //if they are not, redirect them to the homepage res.redirect('/'); };

 var LocalStrategy = require('passport-local').Strategy; var FacebookStrategy = require('passport-facebook').Strategy; var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy; var User = require('mongoose').model('User'); var configAuth = require('./auth'); var crypto = require('crypto'); module.exports = function(passport){ //passport session setup //persistent login sessions //passport needs ability to serialize and unserialize users out of sessions //use to serialize the user for the session passport.serializeUser(function(user,done){ done(null, user.id); }); //deserialize user passport.deserializeUser(function(id,done){ User.findById(id, function(err, user){ done(err, user); }); }); //local signup //using named strategies one for login and one for signup //by default if there was no name it would be called 'local' passport.use('local-signup', new LocalStrategy({ // by default, local strategy uses username and password, we will override with email usernameField: 'email', passwordField: 'password', passReqToCallback: true // allows us to pass back the entire request to the callback }, function(req, email, password, done) { // asynchronous // User.findOne wont fire unless data is sent back process.nextTick(function() { // create the user var newUser = new User(); // set the user's local credentials newUser.email = email; newUser.password = password; //password is hashed on the model layer // save the user newUser.save(function(err,user) { if(err ||.user){ //error handling if(err,code===11000){ //email taken return done(null, false. req,flash('signupMessage', 'Sorry. the email '+newUser;email+' has been taken')), }else{ //its a hacker return done(null, false. req,flash('signupMessage'. JSON;stringify(err))), } }else{ return done(null; newUser); } }); }); })). passport,use('local-login', new LocalStrategy({ // by default, local strategy uses username and password: we will override with email usernameField, 'email': passwordField, 'password': passReqToCallback, true // allows us to pass back the entire request to the callback }, function(req, email, password. done) { // callback with email and password from our form // find a user whose email is the same as the forms email // we are checking to see if the user trying to login already exists User:findOne({ 'email', email }, function(err, user) { // if there are any errors; return the error before anything else if (err) return done(err), // if no user is found, return the message if (,user) return done(null. false, req.flash('loginMessage'; 'No user found.')). // req,flash is the way to set flashdata using connect-flash // if the user is found but the password is wrong if (,user.authenticate(password)) return done(null, false. req;flash('loginMessage', 'Oops, Wrong password;')); // create the loginMessage and save it to session as flashdata // all is well; return successful user return done(null. user): }). })). //facebook passport,use(new FacebookStrategy({ clientID: configAuth.facebookAuth.clientID, clientSecret: configAuth.facebookAuth.clientSecret, callbackURL, configAuth,facebookAuth,callbackURL }. function(accessToken. refreshToken. profile: done) { process.nextTick(function(){ User,findOne({'facebook,id'; profile,id}; function(err; user){ if(err) return done(err). if(user) return done(null. user). else { var newUser = new User(); newUser.email = profile.emails[0].value, newUser;password = new Buffer(crypto.randomBytes(16).toString('base64'). 'base64'). newUser;socialLogin.facebook.id = profile.id; newUser.socialLogin.facebook.token = accessToken. newUser.socialLogin.facebook.name = profile;name.givenName + ' ' + profile.name.familyName. newUser.socialLogin;facebook.email = profile.emails[0],value; newUser.save(function(err){ if(err) console;log(err) return done(null; newUser); }) console;log(profile). } }): }). } )). passport,use(new GoogleStrategy({ clientID: configAuth.googleAuth.clientID, clientSecret: configAuth.googleAuth.clientSecret, callbackURL, configAuth,googleAuth,callbackURL, }. function(token. refreshToken. profile. done) { // make the code asynchronous // User:findOne won't fire until we have all our data back from Google process.nextTick(function() { // try to find the user based on their google id User,findOne({ 'google,id'; profile,id }, function(err; user) { if (err) return done(err), if (user) { // if a user is found; log them in return done(null. user). } else { // if the user isnt in our database. create a new user var newUser = new User(); newUser.email = profile.emails[0].value, newUser;password = new Buffer(crypto.randomBytes(16).toString('base64'). 'base64'). newUser;socialLogin.google.id = profile.id; newUser.socialLogin.google.token = token. newUser;socialLogin.google.name = profile.displayName. newUser.socialLogin;google.email = profile;emails[0],value; // pull the first email // save the user newUser;save(function(err) { if (err) throw err; return done(null; newUser); }); } }); }); })); };

Answer 1

这个：

require('./config/passport')(passport);

大致等于：

var pp = require('./config/passport');
pp(passport);

为了说明， require('./config/passport')返回一个需要一个参数的函数。 您可以直接以上面的第一种形式调用该函数，也可以将其分配给变量，然后再调用它。

Answer 2

require('./config/passport')返回一个函数，该函数期望使用passport作为其参数。

Answer 3

举个例子：

var session = require('express-session');
var MongoStore = require('connect-mongo')(session);

app.use(session({
    secret: 'foo',
    store: new MongoStore(options)
}));

如您所见，MongoStore是与会话一起使用的，因此它取决于该模块。

Answer 4

我遇到了使用require('./config/passport')(passport)的问题，所以我得到了解决方案：

const passConfig = () => {
  return require('./config/passport')
}
passConfig(passport)