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from zope.component import getMultiAdapter
from zope.component import queryMultiAdapter
from zope.component import queryUtility
from zope.interface import directlyProvides
from webob import Request
from webob.exc import HTTPNotFound
from webob.exc import HTTPUnauthorized
from repoze.bfg.interfaces import ITraverserFactory
from repoze.bfg.interfaces import IView
from repoze.bfg.interfaces import IViewPermission
from repoze.bfg.interfaces import ISecurityPolicy
from repoze.bfg.interfaces import IRequest
from repoze.bfg.registry import registry_manager
_marker = ()
class Router:
""" WSGI application which routes requests to 'view' code based on
a view registry"""
def __init__(self, root_policy, registry):
self.root_policy = root_policy
self.registry = registry
def __call__(self, environ, start_response):
registry_manager.set(self.registry)
request = Request(environ)
directlyProvides(request, IRequest)
root = self.root_policy(environ)
path = environ.get('PATH_INFO', '/')
traverser = getMultiAdapter((root, request), ITraverserFactory)
context, name, subpath = traverser(path)
request.context = context
request.view_name = name
request.subpath = subpath
security_policy = queryUtility(ISecurityPolicy)
if security_policy:
permission = queryMultiAdapter((context, request), IViewPermission,
name=name)
if permission is not None:
if not permission(security_policy):
app = HTTPUnauthorized()
app.explanation = repr(permission)
return app(environ, start_response)
response = queryMultiAdapter((context, request), IView, name=name,
default=_marker)
if response is _marker:
app = HTTPNotFound(request.url)
return app(environ, start_response)
if not isResponse(response):
raise ValueError('response was not IResponse: %s' % response)
start_response(response.status, response.headerlist)
return response.app_iter
def isResponse(ob):
# response objects aren't obligated to implement a Zope interface,
# so we do it the hard way
if ( hasattr(ob, 'app_iter') and hasattr(ob, 'headerlist') and
hasattr(ob, 'status') ):
if ( hasattr(ob.app_iter, '__iter__') and
hasattr(ob.headerlist, '__iter__') and
isinstance(ob.status, basestring) ) :
return True
def make_app(root_policy, package=None, filename='configure.zcml'):
""" Create a view registry based on the application's ZCML. and
return a Router object, representing a ``repoze.bfg`` WSGI
application. 'root_policy' must be a callable that accepts a WSGI
environment and returns a graph root object. 'package' is the
dotted-Python-path packagename of the application, 'filename' is
the filesystem path to a ZCML file (optionally relative to the
package path) that should be parsed to create the view registry."""
from repoze.bfg.registry import makeRegistry
registry = makeRegistry(filename, package)
return Router(root_policy, registry)
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