Subdomain routing with Koa?

Question

I wish to be able to do the following:

mydomain.com/this/that

Should redirect differently to:

a.sub.domain.mydomain.com/this/that

I see Express has the following:

github.com/bmullan91/express-subdomain

Koa does have one:

github.com/demohi/koa-subdomain

As you can see it's pretty dead. Anyway to achieve this while using Koa?

Your question is not clear, routing is not related to domains in any way, post your code please... — Willem D'Haeseleer, Apr 23 '15 at 21:52
@ Karl Morrison: Did you notice there is a new koa-sub-domain plugin @Danny made? The last answer contains your perfect solution. I used it - and it is great work ! — , Jun 29 '15 at 09:49

score 5 · Answer 1 · answered May 12 '15 at 06:37

5

you can write a subdomain-middleware to achieve this.

var koa = require('koa');
var app = koa();


routeMain = function *(next) {
    this.body = 'mydomain.com';
};


routeSub = function *(next) {
    this.body = 'sub.mydomain.com';
};


// subdomain middleware
subdomain = function (domain,route){
    return function *(next){
        var s=this.subdomains[0] || '';
        if (s === domain) {
            yield route.call(this,next);
        }
        else{
            yield next;
        }
    };
};


app.use(subdomain('sub', routeSub));
app.use(subdomain('', routeMain));

app.use(function *(next){
    console.log("done");
});


app.listen(3000);

answered May 12 '15 at 06:37

Larvata

169
4

2

@Larvata: I am confused about the line `var s=this.subdomains[0] || '';` how does this work ? Is Koa doing this by collecting all app.use(subdomain and stacking this into the this.subdomains array ? – Danny Jun 20 '15 at 14:55
3

@Danny: because Koa is creating a `this-context` for each request, there is at least one entry in the `this.subdomains[]` array. The `this.subdomains` is not created from the `app.use` - it is an array because it contains also the sub sub sub domains ... e.g. `this.subdomains['bar','foo']` for `foo.bar.example.com` – Jun 20 '15 at 20:18

Danny · Answer 2 · 2015-06-27T23:44:41.640

1

I am very proud to present my first middleware for koa

Koa-Sub-Domain

inspired by express-subdomain but with some more flexibility about wildcards and using generator function instead of routers. It is developed to work well with Koa-router!

edited Jun 27 '15 at 23:44

answered Jun 27 '15 at 23:17

Danny

1,078
7
22

1

I will def check this out! – basickarl Jun 30 '15 at 15:11
1

@KarlMorrison: cool - let me know whether this answers your question. Also feel free to add wishes as issues - I organize further development with integrated project management. Your feedback is very welcome ! – Danny Jun 30 '15 at 15:19

Subdomain routing with Koa?

2 Answers2