guard.py 文件源码

def getChild(self, path, request):
        s = request.getSession()
        if s is None:
            return request.setupSession()
        if path == INIT_PERSPECTIVE:
            def loginSuccess(result):
                interface, avatarAspect, logout = result
                s.setResourceForPortal(avatarAspect, self.portal, logout)

            def triggerLogin(username, password, submit=None):
                return self.portal.login(
                    UsernamePassword(username, password),
                    None, 
                    IResource
                ).addCallback(
                    loginSuccess
                ).addErrback(
                    self._ebFilter
                )

            return form.FormProcessor(
                newLoginSignature.method(
                    triggerLogin
                ),
                callback=self.callback,
                errback=self.errback
            )
        elif path == DESTROY_PERSPECTIVE:
            s.portalLogout(self.portal)
            return Redirect(".")
        else:
            r = s.resourceForPortal(self.portal)
            if r:
                ## Delegate our getChild to the resource our portal says is the right one.
                return getResource(r[0], path, request)
            else:
                return DeferredResource(
                    self.portal.login(Anonymous(), None, IResource
                                      ).addCallback(
                    lambda (interface, avatarAspect, logout):
                    getResource(s.setResourceForPortal(avatarAspect,
                                           self.portal, logout),
                                path, request)))