from .dbdefer import dbdefer

@dbdefer

def extendProvider(session, user, typ, providers):

    user = session.merge(user)

    ret = []

    for p in providers:

        if p in offers.keys() and  p not in ret and user.has_right(typ, offer_name = p): 

                ret.append(p)

        elif user.has_right(typ,provider=p):

            rs = [route for route in offers[p].routes if route not in ret]

            for r in rs:

                n = user.has_right(typ, provider=p, route=r)

                if n:

                    ret.append(n)

    return ret