I want to display a website completely different in function of an arbitrary value.
Let's say I have two routers
const express = require('express');
const app = express();
const router1 = express.Router();
router1.get('/', (req, res, next) => res.json({message: 'I am the router1'}))
const router2 = express.Router();
router2.get('/', (req, res, next) => res.json({message: 'I am the router2'}))
app.use((req, res, next) => {
if(Math.random() > 0.5) {
// Use router1
} else {
// Use router2
}
})
I have no idea how I can do that. I will have a lots of routes (router.get, router.post) I don't want to check that on each route
Thanks
Just return a call to the router:
app.use((req, res, next) => {
if(Math.random() > 0.5) {
return router1(req, res, next)
} else {
return router2(req, res, next)
}
})
This can also be done by usage of .next('router') method.
Here is an example:
const router1 = express.Router();
router1.use((req, res, next) => {
console.log("This gets called everytime!");
if(Math.random() > 0.5)
next('router');//skip to next router object
else
next();//continue with current router
});
router1.get('/',(req, res, next) => {
console.log("Continuing with current router");
res.send("Continuing with current router");
});
const router2 = express.Router();
router2.get('/', (req, res, next) => {
console.log("Skipped Router 1, continuing with router 2");
res.send("Skipped Router 1, continuing with router 2");
});
//binding both routers here
app.use("*", router1, router2);
.next('router') basically skips to next router object, which has been mentioned in the app.use line, if only next() is used then it continues with current router methods.
Why not just?
if(Math.random() > 0.5) {
app.use(router1);
} else {
app.use(router2);
}
Related
I have a middleware that I want to be applied only when the http method is post.
The following works fine, but I get the feeling there is a better way:
'use strict'
const express = require('express'),
router = express.Router()
router.use((req, res, next) => {
if (req.method === 'POST') {
// do stuff
}
return next()
})
module.exports = router
I'd like to do something like this, but it doesn't work:
'use strict'
const express = require('express'),
router = express.Router()
router.post((req, res, next) => {
// do stuff
return next()
})
module.exports = router
You can use * symbol:
const express = require('express')
const app = express();
app.post('*', (req, res, next) => {
console.log('POST happen')
next();
})
app.post('/foo', (req, res) => {
res.send('foo');
});
app.post('/bar', (req, res) => {
res.send('bar');
});
app.listen(11111);
This will respond with "foo" string on POST /foo and with "bar" string on POST /bar but always log "POST happen" to console.
Bookshelf transaction is working only in callback function. How i can do it?
var express = require('express');
var router = express.Router();
router.post('/', (req, res, next) => {
Bookshelf.transaction((trx) => {
req.trx = trx;
next();
});
});
router.post('/', (req, res, next) => {
// use req.trx
});
router.post('/', (req, res, next) => {
// use req.trx
});
router.post('/', (req, res, next) => {
req.trx.commit();
});
I am working with Passport, and I need to pass multiple parameters through to from my controller to my router. Basically it only passes the first one.
I want to get
app.get('/auth/steam', controllers.auth.authenticate);
to result in
app.get('/auth/steam', passport.authenticate('steam'), function(req, res) { res.render('index') };);
Right now it only loads the 1st parameter.
My controller looks like this
exports.authenticate =
passport.authenticate('steam'),
function(req, res) {
res.render('index');
};
How would I do this?
EDIT: I want to only be able to call it with controllers.auth.authenticate, not in an array like: controllers.auth.authenticate[0]!
Warning NOT tested.
You can wrap all inside function
exports.authenticate = function(req, res, next) {
passport.authenticate('steam', function(err, user, info) {
if (err) { return next(err); }
if (!user) { return res.redirect('/auth/steam'); }
res.render("index");
});
}
Or you can use router and protect ALL verbs (get, post, etc)
var express = require('express');
var router = express.Router();
router.use(function (req, res, next) {
passport.authenticate('steam');
});
router.get('/', function(req, res, next) {
res.render("index");
});
module.exports = router;
And use router on the app
var ctrl = require("yourModuleName");
app.use('/auth/steam', ctrl); // app.use NOT app.get
Other alternative is to protect only the get
var express = require('express');
var router = express.Router();
router.get('/', passport.authenticate('steam'), function(req, res, next) {
res.render("index");
});
module.exports = router;
var ctrl = require("yourModuleName");
app.use('/auth/steam', ctrl); // app.use NOT app.get
See Express routing page
When I use http://tes.com/routes, it will route to the api=>get('/'), instead of web=>get('/'). Why?
app.js:
var api = require('./app/routes/routes').api;
var transaction_web = require('./app/routes/routes').web;
app.use('/api/routes', transaction_api);
app.use('/routes', transaction_web);
routes.js:
var api = (function () {
router.get('/', function (req, res, next) {
...
});
return router;
})();
var web = (function () {
router.get('/', function (req, res, next) {
...
});
return router;
})();
module.exports = {
api: api,
web: web
};
The reason is because that's the order in which you're adding the routes.
This:
var api = (function () {
router.get('/', function (req, res, next) {
...
});
return router;
})();
is the same as:
router.get('/', function (req, res, next) {
...
});
var api = router;
The same thing happens with the other block where you assign web, so you end up with:
router.get('/', function (req, res, next) {
// api route
});
var api = router;
router.get('/', function (req, res, next) {
// web route
});
var web = router;
The solution would be to create separate Router instances. For example:
var api = new express.Router();
api.get('/', function (req, res, next) {
// web route
});
var web = new express.Router();
web.get('/', function (req, res, next) {
// web route
});
When I make GET http://localhost:8080/messages/3/sentiments for the code below why param method is called two times? So If I have 10 routes it will be called 10 times?
var comments = new Router();
comments.get('/comments', function (req, res, next) {
res.send('Comments by message_id=' + req.message._id);
})
var sentiments = new Router();
sentiments.get('/sentiments', function (req, res, next) {
res.send('Comments by message_id=' + req.message._id);
})
var messages = new Router();
messages.param('_message', function (req, res, next, _id) {
console.log("Set message");
fs.readFile(__filename, function () {
req.message = { _id: _id };
next();
});
})
messages.use('/messages/:_message/', comments);
messages.use('/messages/:_message/', sentiments);
app.use(messages);
app.listen(8080);
Confirmed to be a bug in Express < 4.3
https://github.com/visionmedia/express/issues/2121