thirdparty/google_appengine/google/appengine/api/users.py
author Todd Larsen <tlarsen@google.com>
Tue, 26 Aug 2008 21:49:54 +0000
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child 1278 a7766286a7be
permissions -rwxr-xr-x
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""Python datastore class User to be used as a datastore data type.
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Classes defined here:
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  User: object representing a user.
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  Error: base exception type
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  BadRequestError: UserService exception
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  UserNotFoundError: UserService exception
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  BackendError: UserService exception
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"""
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import os
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from google.appengine.api import apiproxy_stub_map
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from google.appengine.api import user_service_pb
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from google.appengine.api import api_base_pb
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from google.appengine.runtime import apiproxy_errors
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class Error(Exception):
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  """Base User error type."""
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class UserNotFoundError(Error):
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  """Raised by User.__init__() when there's no email argument and no user is
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  logged in."""
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class RedirectTooLongError(Error):
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  """Raised by UserService calls if the generated redirect URL was too long.
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  """
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class User(object):
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  """A user.
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  We provide here the email address, nickname, and auth domain for a user.
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  A nickname is a human-readable string which uniquely identifies a Google
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  user, akin to a username. It will be an email address for some users, but
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  not all.
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  """
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  def __init__(self, email=None, _auth_domain=None):
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    """Constructor.
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    Args:
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      # email is optional. it defaults to the current user.
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      email: string
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    """
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    if _auth_domain is None:
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      _auth_domain = os.environ.get('AUTH_DOMAIN')
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    else:
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      assert email is not None
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    assert _auth_domain
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    if email is None:
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      assert 'USER_EMAIL' in os.environ
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      email = os.environ['USER_EMAIL']
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    if not email:
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      raise UserNotFoundError
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    self.__email = email
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    self.__auth_domain = _auth_domain
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  def nickname(self):
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    """Return this user's nickname.
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    The nickname will be a unique, human readable identifier for this user
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    with respect to this application. It will be an email address for some
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    users, but not all.
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    """
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    if (self.__email and self.__auth_domain and
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        self.__email.endswith('@' + self.__auth_domain)):
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      suffix_len = len(self.__auth_domain) + 1
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      return self.__email[:-suffix_len]
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    else:
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      return self.__email
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  def email(self):
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    """Return this user's email address."""
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    return self.__email
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  def auth_domain(self):
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    """Return this user's auth domain."""
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    return self.__auth_domain
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  def __unicode__(self):
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    return unicode(self.nickname())
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  def __str__(self):
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    return str(self.nickname())
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  def __repr__(self):
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    return "users.User(email='%s')" % self.email()
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  def __hash__(self):
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    return hash((self.__email, self.__auth_domain))
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  def __cmp__(self, other):
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    if not isinstance(other, User):
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      return NotImplemented
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    return cmp((self.__email, self.__auth_domain),
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               (other.__email, other.__auth_domain))
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def create_login_url(dest_url):
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  """Computes the login URL for this request and specified destination URL.
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  Args:
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    dest_url: String that is the desired final destination URL for the user
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              once login is complete. If 'dest_url' does not have a host
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              specified, we will use the host from the current request.
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  Returns:
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    string
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  """
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  req = user_service_pb.StringProto()
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  resp = user_service_pb.StringProto()
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  req.set_value(dest_url)
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  try:
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    apiproxy_stub_map.MakeSyncCall('user', 'CreateLoginURL', req, resp)
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  except apiproxy_errors.ApplicationError, e:
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    if (e.application_error ==
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        user_service_pb.UserServiceError.REDIRECT_URL_TOO_LONG):
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      raise RedirectTooLongError
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    else:
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      raise e
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  return resp.value()
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CreateLoginURL = create_login_url
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def create_logout_url(dest_url):
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  """Computes the logout URL for this request and specified destination URL.
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  Args:
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    dest_url: String that is the desired final destination URL for the user
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              once logout is complete. If 'dest_url' does not have a host
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              specified, we will use the host from the current request.
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  Returns:
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    string
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  """
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  req = user_service_pb.StringProto()
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  resp = user_service_pb.StringProto()
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  req.set_value(dest_url)
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  try:
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    apiproxy_stub_map.MakeSyncCall('user', 'CreateLogoutURL', req, resp)
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  except apiproxy_errors.ApplicationError, e:
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    if (e.application_error ==
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        user_service_pb.UserServiceError.REDIRECT_URL_TOO_LONG):
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      raise RedirectTooLongError
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    else:
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      raise e
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  return resp.value()
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CreateLogoutURL = create_logout_url
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def get_current_user():
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  try:
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    return User()
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  except UserNotFoundError:
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    return None
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GetCurrentUser = get_current_user
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def is_current_user_admin():
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  """Return true if the user making this request is an admin for this
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  application, false otherwise.
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  We specifically make this a separate function, and not a member function of
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  the User class, because admin status is not persisted in the datastore. It
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  only exists for the user making this request right now.
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  """
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  return (os.environ.get('USER_IS_ADMIN', '0')) == "1"
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IsCurrentUserAdmin = is_current_user_admin