Divmod : Nevow : Authentication and Authorisation

TODO

• Introduction to authentication and authorisation in nevow

Misc Recipes

Using Formless to Render a Guarded Login Page

class LoginPage(rend.Page):
    docFactory = loaders.stan(
        T.html[
            T.head[T.title["Login Please"]],
            T.body[
                webform.renderForms()
            ]
        ]
    )
    
    def bind_login(self, ctx):
        return [
            ('ctx', annotate.Context()),
            ('username', annotate.String(required=True)),
            ('password', annotate.PasswordEntry(required=True)),
        ]
    
    def login(self, ctx, username, password):
        sess = inevow.ISession(ctx)
        req = inevow.IRequest(ctx)
        credentials = UsernamePassword(username, password)
        
        def errorHandler(error):
            #error.trap(UnauthorizedLogin)
            raise annotate.ValidateError(
                {}, 
                formErrorMessage="Your username and / or password were not recognised.", 
                partialForm={'username':username})
        
        def successHandler(pageAndRemainingSegments):
            return url.root
        
        return sess.guard.login(req, sess, credentials, []).addCallback(successHandler).addErrback(errorHandler)