Question

I have some fairly complex routing rules, that are only achievable with custom code, and not with the default router.

The router has also to take into account the domain name.

Is it possible (and how) to define my own Router class, that would have a method accepting a Request and returning the bundle/controller name?

Answer 1

To achieve what you’re asking, you don’t need to completely redefine the router

You can simply write your own class that implements UrlMatcherInterface. If you want to be able to generate URLs that match your scheme as well, you’ll have to create another class which overrides UrlGeneratorInterface as well.

In order to take into account the domain name, you’ll need to use RequestContext, which is passed to their constructors (it’s not well documented, but check Router::get{Matcher,Generator} for the details).

Once your classes are prepared, you can inject them into the router simply by overriding the parameters “router.options.generator_class” and “router.options.matcher_class” in your bundle.

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However, it may not be the best approach for what you want – overriding parts of the router like that requires a lot of care to preserve all of the caching.

You might want to consider using Symfony2’s normal router, but handing it different route files depending on what the request’s domain is. This can be done easily if you configure your web server to set a variable or execute a different front controller depending on the domain name.

Using that information, you can then load a different ‘environment’ per-request, with the only difference between the different environments being that they use different routing files.