138 lines
4.6 KiB
Python
138 lines
4.6 KiB
Python
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# -*- encoding: UTF-8 -*-
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#
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# Form based authentication for CherryPy. Requires the
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# Session tool to be loaded.
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#
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import cherrypy
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SESSION_KEY = '_cp_username'
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def check_credentials(username, password):
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"""Verifies credentials for username and password.
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Returns None on success or a string describing the error on failure"""
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# Adapt to your needs
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if username in ('joe', 'steve') and password == 'secret':
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return None
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else:
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return u"Incorrect username or password."
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# An example implementation which uses an ORM could be:
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# u = User.get(username)
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# if u is None:
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# return u"Username %s is unknown to me." % username
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# if u.password != md5.new(password).hexdigest():
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# return u"Incorrect password"
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def check_auth(*args, **kwargs):
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"""A tool that looks in config for 'auth.require'. If found and it
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is not None, a login is required and the entry is evaluated as a list of
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conditions that the user must fulfill"""
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conditions = cherrypy.request.config.get('auth.require', None)
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if conditions is not None:
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username = cherrypy.session.get(SESSION_KEY)
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if username:
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cherrypy.request.login = username
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for condition in conditions:
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# A condition is just a callable that returns true or false
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if not condition():
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raise cherrypy.HTTPRedirect("/auth/login")
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else:
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raise cherrypy.HTTPRedirect("/auth/login")
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cherrypy.tools.auth = cherrypy.Tool('before_handler', check_auth)
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def require(*conditions):
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"""A decorator that appends conditions to the auth.require config
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variable."""
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def decorate(f):
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if not hasattr(f, '_cp_config'):
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f._cp_config = dict()
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if 'auth.require' not in f._cp_config:
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f._cp_config['auth.require'] = []
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f._cp_config['auth.require'].extend(conditions)
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return f
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return decorate
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# Conditions are callables that return True
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# if the user fulfills the conditions they define, False otherwise
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#
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# They can access the current username as cherrypy.request.login
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#
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# Define those at will however suits the application.
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def member_of(groupname):
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def check():
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# replace with actual check if <username> is in <groupname>
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return cherrypy.request.login == 'joe' and groupname == 'admin'
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return check
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def name_is(reqd_username):
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return lambda: reqd_username == cherrypy.request.login
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# These might be handy
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def any_of(*conditions):
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"""Returns True if any of the conditions match"""
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def check():
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for c in conditions:
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if c():
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return True
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return False
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return check
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# By default all conditions are required, but this might still be
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# needed if you want to use it inside of an any_of(...) condition
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def all_of(*conditions):
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"""Returns True if all of the conditions match"""
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def check():
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for c in conditions:
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if not c():
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return False
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return True
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return check
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# Controller to provide login and logout actions
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class AuthController(object):
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def on_login(self, username):
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"""Called on successful login"""
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def on_logout(self, username):
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"""Called on logout"""
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def get_loginform(self, username, msg="Enter login information", from_page="/"):
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return """<html><body>
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<form method="post" action="/auth/login">
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<input type="hidden" name="from_page" value="%(from_page)s" />
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%(msg)s<br />
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Username: <input type="text" name="username" value="%(username)s" /><br />
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Password: <input type="password" name="password" /><br />
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<input type="submit" value="Log in" />
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</body></html>""" % locals()
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@cherrypy.expose
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def login(self, username=None, password=None, from_page="/"):
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if username is None or password is None:
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return self.get_loginform("", from_page=from_page)
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error_msg = check_credentials(username, password)
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if error_msg:
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return self.get_loginform(username, error_msg, from_page)
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else:
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cherrypy.session[SESSION_KEY] = cherrypy.request.login = username
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self.on_login(username)
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raise cherrypy.HTTPRedirect(from_page or "/")
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@cherrypy.expose
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def logout(self, from_page="/"):
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sess = cherrypy.session
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username = sess.get(SESSION_KEY, None)
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sess[SESSION_KEY] = None
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if username:
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cherrypy.request.login = None
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self.on_logout(username)
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raise cherrypy.HTTPRedirect(from_page or "/")
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