app/soc/logic/accounts.py
author Todd Larsen <tlarsen@google.com>
Sat, 15 Nov 2008 03:12:33 +0000
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parent 457 app/soc/logic/site/id_user.py@6cf15fa24263
child 499 d22e4fe8e64b
permissions -rw-r--r--
Attempt to rename User.id to User.account, in preparation for making User be derived from Linkable, which will have a property named 'id'. Patch by: Todd Larsen
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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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"""Basic Google Account and User (Model) query functions.
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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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  ]
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from google.appengine.api import users
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from soc.logic import models
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from soc.logic import out_of_band
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import soc.models.user
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import soc.logic.models.user
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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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  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, the is_developer property of
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  the User entity corresponding to the Google Account is checked next.
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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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  Args:
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    account: a Google Account (users.User) object; if not supplied,
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      the current logged-in user is checked
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  """
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  # Get the currently logged in user
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  current = users.get_current_user()
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  if not (account or current):
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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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  if (((not account) or (account == current))
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      and users.is_current_user_admin()):
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    # no account supplied, or current logged-in user, and that user 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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  if not account:
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    account = current
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  user = models.user.logic.getForFields({'account': account}, unique=True)
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  if not user:
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    # no User entity for this Google Account, and account is not the
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    # currently logged-in user, so there is no conclusive way to check the
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    # Administration->Developers list in the App Engine console
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    return False
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  return user.is_developer
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def isAccountAvailable(new_account,
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                       existing_user=None, existing_key_name=None):
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  """Returns True if Google Account is available for use by existing User.
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  Args:
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    new_account: a Google Account (users.User) object with a (possibly)
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      new email
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    existing_user: an existing User entity; default is None, in which case
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      existing_key_name is used to look up the User entity
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    existing_key_name: the key_name of an existing User entity, used
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      when existing_user is not supplied; default is None
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  """
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  if not existing_user:
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    existing_user = models.user.logic.getFromKeyName(existing_key_name)
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  if existing_user:
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    old_email = existing_user.account.email()
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  else:
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    old_email = None
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  if new_account.email().lower() == old_email.lower():
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    # "new" email is same as existing User wanting it, so it is "available"
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    return True
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  # else: "new" email truly is new to the existing User, so keep checking
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  if not models.user.logic.getForFields({'account': new_account},
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                                        unique=True):
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    # new email address also does not belong to any other User,
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    # so it is available
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    return True
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  # email does not already belong to this User, but to some other User
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  return False
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# TODO(tlarsen): make this generic for any Linkable and move elsewhere
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def getUserFromLinkNameOr404(link_name):
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  """Like getUserFromLinkName but expects to find a user
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  Raises:
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    out_of_band.ErrorResponse if no User entity is found
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  """
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  user = models.user.logic.getForFields({'link_name': link_name},
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                                        unique=True)
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  if user:
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    return user
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  raise out_of_band.ErrorResponse(
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      'There is no user with a "link name" of "%s".' % link_name, status=404)