python - Multiple domains and subdomains on a single Pyramid instance

Question

I'm looking to have multiple domains and subdomains on a single Pyramid instance. However, I can't seem to find any documentation on it. The last question referred to a glossary with very little information and no examples. Do any of you have any examples or can direct me to better documentation?

Answer 1

Pyramid is just a WSGI application. This means it's dependent on the HTTP_HOST environ key (set by the Host header) to determine the host of the application. It's all relative. Point-being that Pyramid has no restrictions on what it can accept, thus the world is your oyster and you can set it up to limit content to various domains however you'd like. This of course starts with what hosts your webserver is configured to feed to your application.

Assuming you're using URL dispatch, you might want to design some custom route predicates that check the request.host value for whatever you'd like. Returning False from that predicate will prevent that route from ever matching a request to that host.

This is a large topic, so it might help if you give some more specifics. For example, since Pyramid is relative, any URL you may want to generate from 'example.com' to redirect someone to 'sub.example.com' will need to be done via a pregenerator.

def pregen(request, elements, kw):
    kw['_app_url'] = 'http://sub.example.com'
    return elements, kw

def req_sub(info, request):
    return request.host.startswith('sub')

config.add_route('sub_only', '/',
                 custom_predicates=(req_sub,),
                 pregenerator=pregen)
config.add_route('foo', '/foo')
config.add_view(view, route_name-'foo')

def view(request):
    # redirect the user to "http://sub.example.com", regardless of whether
    # request.host is "example.com" or "sub.example.com"
    return HTTPFound(request.route_url('sub_only'))