how to set the callable function parameters of 'before_handler' in cherrypy

Question

def do_redirect(): raise cherrypy.HTTPRedirect("/login.html")

def check_auth(call_func): # do check ... if check_success(): return call_func() cherrypy.tools.auth = cherrypy.Tool('before_handler', check_auth) cherrypy.tools.auth.call_func = do_redirect

I want to set the function do_redirect as check_auth's parameter, but it throw the follow exception: TypeError: check_auth() takes exactly 1 argument (0 given)

but it can works if modify to follow code: def check_auth(call_func): # do check ... if check_success(): return cherrypy.tools.auth.call_func() cherrypy.tools.auth = cherrypy.Tool('before_handler', check_auth) cherrypy.tools.auth.call_func = do_redirect

how to set the callable function parameters of 'before_handler' in cherrypy?

Answer 1

There are a couple of way on setting the argument for a tool, take a look to this example:

import cherrypy as cp


def check_success():
    return False

def do_redirect():
    raise cp.HTTPRedirect("/login.html")

def fancy_redirect():
    raise cp.HTTPRedirect("/fancy_login.html")

def secret_redirect():
    raise cp.HTTPRedirect("/secret_login.html")

def check_auth(call_func=do_redirect):
    # do check ...
    if check_success():
        return
    call_func()

cp.tools.auth = cp.Tool('before_handler', check_auth, priority=60)

class App:

    @cp.expose
    @cp.tools.auth() # use the default
    def index(self):
        return "The common content"

    @cp.expose
    def fancy(self):
        return "The fancy content"

    @cp.expose
    @cp.tools.auth(call_func=secret_redirect) # as argument
    def secret(self):
        return "The secret content"

    @cp.expose
    def login_html(self):
        return "Login!"

    @cp.expose
    def fancy_login_html(self):
        return "<h1>Please login!</h1>"

    @cp.expose
    def secret_login_html(sel):
        return "<small>Psst.. login..</small>"


cp.quickstart(App(), config={
    '/fancy': {
        'tools.auth.on': True,
        'tools.auth.call_func': fancy_redirect  # from config
    }
})