445 lines
14 KiB
Python
445 lines
14 KiB
Python
from django.contrib import auth
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from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
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from django.contrib.auth.signals import user_logged_in
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from django.contrib.contenttypes.models import ContentType
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from django.core.exceptions import PermissionDenied
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from django.core.mail import send_mail
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from django.db import models
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from django.db.models.manager import EmptyManager
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from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
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from .validators import UnicodeUsernameValidator
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def update_last_login(sender, user, **kwargs):
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"""
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A signal receiver which updates the last_login date for
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the user logging in.
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"""
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user.last_login = timezone.now()
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user.save(update_fields=['last_login'])
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user_logged_in.connect(update_last_login)
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class PermissionManager(models.Manager):
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use_in_migrations = True
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def get_by_natural_key(self, codename, app_label, model):
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return self.get(
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codename=codename,
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content_type=ContentType.objects.db_manager(self.db).get_by_natural_key(app_label, model),
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)
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class Permission(models.Model):
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"""
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The permissions system provides a way to assign permissions to specific
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users and groups of users.
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The permission system is used by the Django admin site, but may also be
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useful in your own code. The Django admin site uses permissions as follows:
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- The "add" permission limits the user's ability to view the "add" form
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and add an object.
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- The "change" permission limits a user's ability to view the change
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list, view the "change" form and change an object.
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- The "delete" permission limits the ability to delete an object.
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Permissions are set globally per type of object, not per specific object
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instance. It is possible to say "Mary may change news stories," but it's
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not currently possible to say "Mary may change news stories, but only the
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ones she created herself" or "Mary may only change news stories that have a
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certain status or publication date."
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Three basic permissions -- add, change and delete -- are automatically
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created for each Django model.
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"""
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name = models.CharField(_('name'), max_length=255)
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content_type = models.ForeignKey(
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ContentType,
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models.CASCADE,
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verbose_name=_('content type'),
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)
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codename = models.CharField(_('codename'), max_length=100)
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objects = PermissionManager()
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class Meta:
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verbose_name = _('permission')
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verbose_name_plural = _('permissions')
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unique_together = (('content_type', 'codename'),)
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ordering = ('content_type__app_label', 'content_type__model',
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'codename')
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def __str__(self):
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return "%s | %s | %s" % (
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self.content_type.app_label,
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self.content_type,
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self.name,
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)
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def natural_key(self):
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return (self.codename,) + self.content_type.natural_key()
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natural_key.dependencies = ['contenttypes.contenttype']
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class GroupManager(models.Manager):
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"""
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The manager for the auth's Group model.
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"""
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use_in_migrations = True
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def get_by_natural_key(self, name):
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return self.get(name=name)
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class Group(models.Model):
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"""
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Groups are a generic way of categorizing users to apply permissions, or
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some other label, to those users. A user can belong to any number of
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groups.
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A user in a group automatically has all the permissions granted to that
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group. For example, if the group 'Site editors' has the permission
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can_edit_home_page, any user in that group will have that permission.
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Beyond permissions, groups are a convenient way to categorize users to
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apply some label, or extended functionality, to them. For example, you
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could create a group 'Special users', and you could write code that would
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do special things to those users -- such as giving them access to a
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members-only portion of your site, or sending them members-only email
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messages.
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"""
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name = models.CharField(_('name'), max_length=80, unique=True)
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permissions = models.ManyToManyField(
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Permission,
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verbose_name=_('permissions'),
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blank=True,
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)
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objects = GroupManager()
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class Meta:
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verbose_name = _('group')
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verbose_name_plural = _('groups')
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def __str__(self):
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return self.name
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def natural_key(self):
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return (self.name,)
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class UserManager(BaseUserManager):
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use_in_migrations = True
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def _create_user(self, username, email, password, **extra_fields):
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"""
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Creates and saves a User with the given username, email and password.
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"""
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if not username:
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raise ValueError('The given username must be set')
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email = self.normalize_email(email)
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username = self.model.normalize_username(username)
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user = self.model(username=username, email=email, **extra_fields)
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user.set_password(password)
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user.save(using=self._db)
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return user
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def create_user(self, username, email=None, password=None, **extra_fields):
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extra_fields.setdefault('is_staff', False)
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extra_fields.setdefault('is_superuser', False)
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return self._create_user(username, email, password, **extra_fields)
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def create_superuser(self, username, email, password, **extra_fields):
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extra_fields.setdefault('is_staff', True)
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extra_fields.setdefault('is_superuser', True)
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if extra_fields.get('is_staff') is not True:
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raise ValueError('Superuser must have is_staff=True.')
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if extra_fields.get('is_superuser') is not True:
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raise ValueError('Superuser must have is_superuser=True.')
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return self._create_user(username, email, password, **extra_fields)
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# A few helper functions for common logic between User and AnonymousUser.
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def _user_get_all_permissions(user, obj):
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permissions = set()
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for backend in auth.get_backends():
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if hasattr(backend, "get_all_permissions"):
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permissions.update(backend.get_all_permissions(user, obj))
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return permissions
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def _user_has_perm(user, perm, obj):
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"""
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A backend can raise `PermissionDenied` to short-circuit permission checking.
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"""
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for backend in auth.get_backends():
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if not hasattr(backend, 'has_perm'):
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continue
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try:
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if backend.has_perm(user, perm, obj):
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return True
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except PermissionDenied:
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return False
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return False
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def _user_has_module_perms(user, app_label):
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"""
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A backend can raise `PermissionDenied` to short-circuit permission checking.
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"""
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for backend in auth.get_backends():
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if not hasattr(backend, 'has_module_perms'):
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continue
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try:
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if backend.has_module_perms(user, app_label):
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return True
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except PermissionDenied:
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return False
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return False
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class PermissionsMixin(models.Model):
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"""
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A mixin class that adds the fields and methods necessary to support
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Django's Group and Permission model using the ModelBackend.
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"""
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is_superuser = models.BooleanField(
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_('superuser status'),
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default=False,
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help_text=_(
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'Designates that this user has all permissions without '
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'explicitly assigning them.'
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),
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)
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groups = models.ManyToManyField(
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Group,
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verbose_name=_('groups'),
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blank=True,
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help_text=_(
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'The groups this user belongs to. A user will get all permissions '
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'granted to each of their groups.'
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),
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related_name="user_set",
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related_query_name="user",
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)
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user_permissions = models.ManyToManyField(
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Permission,
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verbose_name=_('user permissions'),
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blank=True,
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help_text=_('Specific permissions for this user.'),
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related_name="user_set",
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related_query_name="user",
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)
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class Meta:
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abstract = True
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def get_group_permissions(self, obj=None):
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"""
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Returns a list of permission strings that this user has through their
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groups. This method queries all available auth backends. If an object
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is passed in, only permissions matching this object are returned.
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"""
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permissions = set()
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for backend in auth.get_backends():
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if hasattr(backend, "get_group_permissions"):
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permissions.update(backend.get_group_permissions(self, obj))
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return permissions
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def get_all_permissions(self, obj=None):
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return _user_get_all_permissions(self, obj)
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def has_perm(self, perm, obj=None):
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"""
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Returns True if the user has the specified permission. This method
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queries all available auth backends, but returns immediately if any
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backend returns True. Thus, a user who has permission from a single
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auth backend is assumed to have permission in general. If an object is
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provided, permissions for this specific object are checked.
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"""
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# Active superusers have all permissions.
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if self.is_active and self.is_superuser:
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return True
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# Otherwise we need to check the backends.
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return _user_has_perm(self, perm, obj)
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def has_perms(self, perm_list, obj=None):
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"""
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Returns True if the user has each of the specified permissions. If
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object is passed, it checks if the user has all required perms for this
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object.
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"""
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return all(self.has_perm(perm, obj) for perm in perm_list)
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def has_module_perms(self, app_label):
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"""
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Returns True if the user has any permissions in the given app label.
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Uses pretty much the same logic as has_perm, above.
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"""
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# Active superusers have all permissions.
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if self.is_active and self.is_superuser:
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return True
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return _user_has_module_perms(self, app_label)
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class AbstractUser(AbstractBaseUser, PermissionsMixin):
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"""
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An abstract base class implementing a fully featured User model with
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admin-compliant permissions.
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Username and password are required. Other fields are optional.
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"""
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username_validator = UnicodeUsernameValidator()
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username = models.CharField(
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_('username'),
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max_length=150,
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unique=True,
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help_text=_('Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.'),
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validators=[username_validator],
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error_messages={
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'unique': _("A user with that username already exists."),
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},
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)
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first_name = models.CharField(_('first name'), max_length=30, blank=True)
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last_name = models.CharField(_('last name'), max_length=30, blank=True)
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email = models.EmailField(_('email address'), blank=True)
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is_staff = models.BooleanField(
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_('staff status'),
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default=False,
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help_text=_('Designates whether the user can log into this admin site.'),
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)
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is_active = models.BooleanField(
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_('active'),
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default=True,
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help_text=_(
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'Designates whether this user should be treated as active. '
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'Unselect this instead of deleting accounts.'
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),
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)
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date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
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objects = UserManager()
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EMAIL_FIELD = 'email'
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USERNAME_FIELD = 'username'
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REQUIRED_FIELDS = ['email']
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class Meta:
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verbose_name = _('user')
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verbose_name_plural = _('users')
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abstract = True
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def clean(self):
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super(AbstractUser, self).clean()
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self.email = self.__class__.objects.normalize_email(self.email)
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def get_full_name(self):
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"""
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Returns the first_name plus the last_name, with a space in between.
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"""
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full_name = '%s %s' % (self.first_name, self.last_name)
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return full_name.strip()
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def get_short_name(self):
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"Returns the short name for the user."
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return self.first_name
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def email_user(self, subject, message, from_email=None, **kwargs):
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"""
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Sends an email to this User.
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"""
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send_mail(subject, message, from_email, [self.email], **kwargs)
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class User(AbstractUser):
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"""
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Users within the Django authentication system are represented by this
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model.
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Username, password and email are required. Other fields are optional.
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"""
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class Meta(AbstractUser.Meta):
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swappable = 'AUTH_USER_MODEL'
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class AnonymousUser:
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id = None
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pk = None
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username = ''
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is_staff = False
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is_active = False
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is_superuser = False
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_groups = EmptyManager(Group)
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_user_permissions = EmptyManager(Permission)
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def __init__(self):
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pass
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def __str__(self):
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return 'AnonymousUser'
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def __eq__(self, other):
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return isinstance(other, self.__class__)
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def __hash__(self):
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return 1 # instances always return the same hash value
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def save(self):
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raise NotImplementedError("Django doesn't provide a DB representation for AnonymousUser.")
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def delete(self):
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raise NotImplementedError("Django doesn't provide a DB representation for AnonymousUser.")
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def set_password(self, raw_password):
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raise NotImplementedError("Django doesn't provide a DB representation for AnonymousUser.")
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def check_password(self, raw_password):
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raise NotImplementedError("Django doesn't provide a DB representation for AnonymousUser.")
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@property
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def groups(self):
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return self._groups
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@property
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def user_permissions(self):
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return self._user_permissions
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def get_group_permissions(self, obj=None):
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return set()
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def get_all_permissions(self, obj=None):
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return _user_get_all_permissions(self, obj=obj)
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def has_perm(self, perm, obj=None):
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return _user_has_perm(self, perm, obj=obj)
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def has_perms(self, perm_list, obj=None):
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for perm in perm_list:
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if not self.has_perm(perm, obj):
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return False
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return True
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def has_module_perms(self, module):
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return _user_has_module_perms(self, module)
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@property
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def is_anonymous(self):
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return True
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@property
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def is_authenticated(self):
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return False
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def get_username(self):
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return self.username
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