app/django/contrib/auth/models.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
changeset 3093 d1be59b6b627
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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import datetime
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import urllib
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from django.contrib import auth
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from django.core.exceptions import ImproperlyConfigured
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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.contrib.contenttypes.models import ContentType
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from django.utils.encoding import smart_str
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from django.utils.hashcompat import md5_constructor, sha_constructor
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from django.utils.translation import ugettext_lazy as _
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UNUSABLE_PASSWORD = '!' # This will never be a valid hash
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try:
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    set
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except NameError:
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    from sets import Set as set   # Python 2.3 fallback
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def get_hexdigest(algorithm, salt, raw_password):
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    """
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    Returns a string of the hexdigest of the given plaintext password and salt
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    using the given algorithm ('md5', 'sha1' or 'crypt').
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    """
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    raw_password, salt = smart_str(raw_password), smart_str(salt)
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    if algorithm == 'crypt':
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        try:
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            import crypt
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        except ImportError:
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            raise ValueError('"crypt" password algorithm not supported in this environment')
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        return crypt.crypt(raw_password, salt)
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    if algorithm == 'md5':
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        return md5_constructor(salt + raw_password).hexdigest()
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    elif algorithm == 'sha1':
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        return sha_constructor(salt + raw_password).hexdigest()
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    raise ValueError("Got unknown password algorithm type in password.")
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def check_password(raw_password, enc_password):
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    """
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    Returns a boolean of whether the raw_password was correct. Handles
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    encryption formats behind the scenes.
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    """
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    algo, salt, hsh = enc_password.split('$')
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    return hsh == get_hexdigest(algo, salt, raw_password)
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class SiteProfileNotAvailable(Exception):
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    pass
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class Permission(models.Model):
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    """The permissions system provides a way to assign permissions to specific users and groups of users.
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    The permission system is used by the Django admin site, but may also be 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 and add an object.
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        - The "change" permission limits a user's ability to view the change 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 instance. It is possible to say "Mary may change news stories," but it's not currently possible to say "Mary may change news stories, but only the ones she created herself" or "Mary may only change news stories that have a certain status or publication date."
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    Three basic permissions -- add, change and delete -- are automatically created for each Django model.
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    """
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    name = models.CharField(_('name'), max_length=50)
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    content_type = models.ForeignKey(ContentType)
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    codename = models.CharField(_('codename'), max_length=100)
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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', 'codename')
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    def __unicode__(self):
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        return u"%s | %s | %s" % (
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            unicode(self.content_type.app_label),
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            unicode(self.content_type),
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            unicode(self.name))
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class Group(models.Model):
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    """Groups are a generic way of categorizing users to apply permissions, or some other label, to those users. A user can belong to any number of groups.
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    A user in a group automatically has all the permissions granted to that group. For example, if the group Site editors has the permission 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 apply some label, or extended functionality, to them. For example, you could create a group 'Special users', and you could write code that would do special things to those users -- such as giving them access to a members-only portion of your site, or sending them members-only e-mail 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(Permission, verbose_name=_('permissions'), blank=True)
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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 __unicode__(self):
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        return self.name
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class UserManager(models.Manager):
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    def create_user(self, username, email, password=None):
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        "Creates and saves a User with the given username, e-mail and password."
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        now = datetime.datetime.now()
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        user = self.model(None, username, '', '', email.strip().lower(), 'placeholder', False, True, False, now, now)
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        if password:
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            user.set_password(password)
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        else:
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            user.set_unusable_password()
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        user.save()
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        return user
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    def create_superuser(self, username, email, password):
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        u = self.create_user(username, email, password)
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        u.is_staff = True
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        u.is_active = True
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        u.is_superuser = True
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        u.save()
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    def make_random_password(self, length=10, allowed_chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789'):
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        "Generates a random password with the given length and given allowed_chars"
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        # Note that default value of allowed_chars does not have "I" or letters
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        # that look like it -- just to avoid confusion.
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        from random import choice
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        return ''.join([choice(allowed_chars) for i in range(length)])
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class User(models.Model):
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    """Users within the Django authentication system are represented by this model.
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    Username and password are required. Other fields are optional.
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    """
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    username = models.CharField(_('username'), max_length=30, unique=True, help_text=_("Required. 30 characters or fewer. Alphanumeric characters only (letters, digits and underscores)."))
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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(_('e-mail address'), blank=True)
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    password = models.CharField(_('password'), max_length=128, help_text=_("Use '[algo]$[salt]$[hexdigest]' or use the <a href=\"password/\">change password form</a>."))
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    is_staff = models.BooleanField(_('staff status'), default=False, help_text=_("Designates whether the user can log into this admin site."))
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    is_active = models.BooleanField(_('active'), default=True, help_text=_("Designates whether this user should be treated as active. Unselect this instead of deleting accounts."))
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    is_superuser = models.BooleanField(_('superuser status'), default=False, help_text=_("Designates that this user has all permissions without explicitly assigning them."))
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    last_login = models.DateTimeField(_('last login'), default=datetime.datetime.now)
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    date_joined = models.DateTimeField(_('date joined'), default=datetime.datetime.now)
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    groups = models.ManyToManyField(Group, verbose_name=_('groups'), blank=True,
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        help_text=_("In addition to the permissions manually assigned, this user will also get all permissions granted to each group he/she is in."))
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    user_permissions = models.ManyToManyField(Permission, verbose_name=_('user permissions'), blank=True)
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    objects = UserManager()
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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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    def __unicode__(self):
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        return self.username
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    def get_absolute_url(self):
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        return "/users/%s/" % urllib.quote(smart_str(self.username))
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    def is_anonymous(self):
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        "Always returns False. This is a way of comparing User objects to anonymous users."
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        return False
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    def is_authenticated(self):
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        """Always return True. This is a way to tell if the user has been authenticated in templates.
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        """
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        return True
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    def get_full_name(self):
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        "Returns the first_name plus the last_name, with a space in between."
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        full_name = u'%s %s' % (self.first_name, self.last_name)
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        return full_name.strip()
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    def set_password(self, raw_password):
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        import random
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        algo = 'sha1'
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        salt = get_hexdigest(algo, str(random.random()), str(random.random()))[:5]
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        hsh = get_hexdigest(algo, salt, raw_password)
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        self.password = '%s$%s$%s' % (algo, salt, hsh)
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    def check_password(self, raw_password):
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        """
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        Returns a boolean of whether the raw_password was correct. Handles
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        encryption formats behind the scenes.
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        """
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        # Backwards-compatibility check. Older passwords won't include the
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        # algorithm or salt.
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        if '$' not in self.password:
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            is_correct = (self.password == get_hexdigest('md5', '', raw_password))
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            if is_correct:
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                # Convert the password to the new, more secure format.
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                self.set_password(raw_password)
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                self.save()
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            return is_correct
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        return check_password(raw_password, self.password)
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    def set_unusable_password(self):
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        # Sets a value that will never be a valid hash
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        self.password = UNUSABLE_PASSWORD
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    def has_usable_password(self):
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        return self.password != UNUSABLE_PASSWORD
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    def get_group_permissions(self):
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        """
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        Returns a list of permission strings that this user has through
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        his/her groups. This method queries all available auth backends.
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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))
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        return permissions
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    def get_all_permissions(self):
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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(self))
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        return permissions
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    def has_perm(self, perm):
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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.
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        """
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        # Inactive users have no permissions.
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        if not self.is_active:
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            return False
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        # Superusers have all permissions.
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        if self.is_superuser:
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            return True
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        # Otherwise we need to check the backends.
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        for backend in auth.get_backends():
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            if hasattr(backend, "has_perm"):
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                if backend.has_perm(self, perm):
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                    return True
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        return False
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    def has_perms(self, perm_list):
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        """Returns True if the user has each of the specified permissions."""
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        for perm in perm_list:
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            if not self.has_perm(perm):
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                return False
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        return True
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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
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        label. Uses pretty much the same logic as has_perm, above.
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        """
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        if not self.is_active:
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            return False
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        if self.is_superuser:
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            return True
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        for backend in auth.get_backends():
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            if hasattr(backend, "has_module_perms"):
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                if backend.has_module_perms(self, app_label):
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                    return True
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        return False
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    def get_and_delete_messages(self):
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        messages = []
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        for m in self.message_set.all():
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            messages.append(m.message)
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            m.delete()
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        return messages
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    def email_user(self, subject, message, from_email=None):
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        "Sends an e-mail to this User."
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        from django.core.mail import send_mail
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        send_mail(subject, message, from_email, [self.email])
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    def get_profile(self):
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        """
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        Returns site-specific profile for this user. Raises
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        SiteProfileNotAvailable if this site does not allow profiles.
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        """
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        if not hasattr(self, '_profile_cache'):
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            from django.conf import settings
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            if not getattr(settings, 'AUTH_PROFILE_MODULE', False):
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                raise SiteProfileNotAvailable
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            try:
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                app_label, model_name = settings.AUTH_PROFILE_MODULE.split('.')
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                model = models.get_model(app_label, model_name)
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                self._profile_cache = model._default_manager.get(user__id__exact=self.id)
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                self._profile_cache.user = self
54
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            except (ImportError, ImproperlyConfigured):
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                raise SiteProfileNotAvailable
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        return self._profile_cache
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class Message(models.Model):
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    """
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    The message system is a lightweight way to queue messages for given
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    users. A message is associated with a User instance (so it is only
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    applicable for registered users). There's no concept of expiration or
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    timestamps. Messages are created by the Django admin after successful
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    actions. For example, "The poll Foo was created successfully." is a
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    message.
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    """
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    user = models.ForeignKey(User)
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    message = models.TextField(_('message'))
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    def __unicode__(self):
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        return self.message
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class AnonymousUser(object):
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    id = 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()
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    _user_permissions = EmptyManager()
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    def __init__(self):
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        pass
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    def __unicode__(self):
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        return 'AnonymousUser'
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    def __str__(self):
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        return unicode(self).encode('utf-8')
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    def __eq__(self, other):
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        return isinstance(other, self.__class__)
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    def __ne__(self, other):
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        return not self.__eq__(other)
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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
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    def delete(self):
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        raise NotImplementedError
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    def set_password(self, raw_password):
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        raise NotImplementedError
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    def check_password(self, raw_password):
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        raise NotImplementedError
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    def _get_groups(self):
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        return self._groups
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    groups = property(_get_groups)
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    def _get_user_permissions(self):
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        return self._user_permissions
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    user_permissions = property(_get_user_permissions)
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    def has_perm(self, perm):
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        return False
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    def has_perms(self, perm_list):
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        return False
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54
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    def has_module_perms(self, module):
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        return False
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    def get_and_delete_messages(self):
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        return []
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    def is_anonymous(self):
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        return True
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    def is_authenticated(self):
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        return False