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−#!/usr/bin/python2.5
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−#
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−# Copyright 2008 the Melange authors.
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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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−"""Basic Google Account and User (Model) query functions.
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−"""
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−
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−__authors__ = [
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−  '"Chen Lunpeng" <forever.clp@gmail.com>',
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−  '"Todd Larsen" <tlarsen@google.com>',
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−  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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−  ]
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−
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−
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−from google.appengine.api import users
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−
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−
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−def getCurrentAccount(normalize=True):
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−  """Returns an optionally normalized version of the current account.
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−  """
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−
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−  account = users.get_current_user()
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−  return normalizeAccount(account) if (account and normalize) else account
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−
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−
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−def getCurrentUserId():
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−  """Returns a unique id of the current user.
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−  """
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−
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−  return users.get_current_user().user_id()
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−
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−
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−def normalizeAccount(account):
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−  """Returns a normalized version of the specified account.
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−  """
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−
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−  normalized = str(account).lower()
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−
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−  if account.email() == normalized:
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−    return account
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−
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−  return users.User(email=normalized)
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−
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−
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−def denormalizeAccount(account):
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−  """Returns a denormalized version of the specified account.
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−  """
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−
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−  if account.email().find('@') != -1:
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−    return account
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−
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−  domain = account.auth_domain()
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−  denormalized = ''.join([account.email(), '@', domain])
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−
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−  return users.User(email=denormalized)
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−
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−
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−def isDeveloper(account=None):
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−  """Returns True if a Google Account is a Developer with special privileges.
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−
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−  Since it only works on the current logged-in user, if account matches the
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−  current logged-in Google Account, the App Engine Users API function
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−  user.is_current_user_admin() is checked.  If that returns False, or
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−  account is not the currently logged-in user, False is returned.
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−
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−  This solves the "chicken-and-egg" problem of no User entity having its
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−  is_developer property set, but no one being able to set it.
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−
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−  Args:
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−    account: a Google Account (users.User) object;
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−      if not supplied, the current logged-in user is checked
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−  """
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−
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−  # Get the currently logged in user
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−  current = getCurrentAccount()
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−
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−  if current and (not account):
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−    # default to the current user
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−    account = current
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−
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−  if not account:
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−    # no Google Account was supplied or is logged in, so an unspecified
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−    # User is definitely *not* a Developer
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−    return False
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−
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−  if (account == current) and users.is_current_user_admin():
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−    # the current account should be checked, and it is in the
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−    # Administration->Developers list in the App Engine console
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−    return True
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−
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−  # account is not current user, or current user is not an admin
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−  return False