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from paste import httpexceptions
import event
__all__ = ['public', 'ActionDispatch', 'PathDispatch']
def public(func):
func.public = True
return func
class MethodDispatch(object):
prefix = None
def __addtoclass__(self, attr, cls):
cls.listeners.append(self.respond_event)
def respond_event(self, name, servlet, *args, **kw):
if name == 'end_awake':
return self.find_method(servlet, *args, **kw)
return event.Continue
def get_method(self, servlet, action):
try:
return action, getattr(servlet, action)
except AttributeError:
pass
if self.prefix:
try:
return (self.prefix + action,
getattr(servlet, self.prefix + action))
except AttributeError:
pass
return None, None
def valid_method(self, name, method):
if getattr(method, 'public', False):
return True
if self.prefix and name.startswith(self.prefix):
return True
return False
class ActionDispatch(MethodDispatch):
prefix = 'action_'
def __init__(self, action_name='_action_'):
self.action_name = action_name
def find_method(self, servlet, ret_value):
possible_actions = []
for name, value in servlet.fields.items():
if name == self.action_name:
possible_actions.append(value)
elif name.startswith(self.action_name):
possible_actions.append(name[len(self.action_name):])
if not possible_actions:
return event.Continue
if len(possible_actions) > 1:
raise httpexceptions.HTTPBadRequest(
"More than one action received: %s"
% ', '.join(map(repr, possible_actions)))
action = possible_actions[0]
name, method = self.get_method(servlet, action)
if name is None:
raise httpexceptions.Forbidden(
"Action method not found: %r" % action)
if not self.valid_method(name, method):
raise httpexceptions.Forbidden(
"Method not allowed: %r" % action)
return method()
class PathDispatch(MethodDispatch):
prefix = 'path_'
def find_method(self, servlet, ret_value):
parts = servlet.path_parts
if not parts:
action = 'index'
else:
action = parts[0]
servlet.path_parts = parts[1:]
name, method = self.get_method(servlet, action)
if name is None:
raise httpexceptions.Forbidden(
"Method not found: %r" % action)
if not self.valid_method(name, method):
raise httpexceptions.Forbidden(
"Method not allowed: %r" % action)
return method()
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