import smtplib from random import choice from django.conf import settings from django.contrib.auth.hashers import make_password from django.contrib.auth.models import ( AbstractBaseUser, BaseUserManager, Group as DjangoGroup, GroupManager as _GroupManager, Permission, PermissionsMixin, ) from django.core import mail from django.core.exceptions import ObjectDoesNotExist, ValidationError from django.db import models from django.db.models import Prefetch from django.utils import timezone from jsonfield import JSONField from ..core.config import config from ..utils.auth import GROUP_ADMIN_PK from ..utils.models import CASCADE_AND_AUTOUODATE, RESTModelMixin from .access_permissions import ( GroupAccessPermissions, PersonalNoteAccessPermissions, UserAccessPermissions, ) class UserManager(BaseUserManager): """ Customized manager that creates new users only with a password and a username. It also supports our get_full_queryset method. """ def get_full_queryset(self): """ Returns the normal queryset with all users. In the background all groups are prefetched from the database together with all permissions and content types. """ return self.get_queryset().prefetch_related( Prefetch( "groups", queryset=Group.objects.select_related("group_ptr").prefetch_related( Prefetch( "permissions", queryset=Permission.objects.select_related("content_type"), ) ), ) ) def create_user(self, username, password, skip_autoupdate=False, **kwargs): """ Creates a new user only with a password and a username. """ user = self.model(username=username, **kwargs) user.set_password(password) user.save(skip_autoupdate=skip_autoupdate, using=self._db) return user def create_or_reset_admin_user(self, skip_autoupdate=False): """ Creates an user with the username 'admin'. If such a user already exists, resets it. The password is (re)set to 'admin'. The user becomes member of the group 'Admin'. """ created = False try: admin = self.get(username="admin") except ObjectDoesNotExist: admin = self.model(username="admin", last_name="Administrator") created = True admin.default_password = "admin" admin.password = make_password(admin.default_password) admin.save(skip_autoupdate=skip_autoupdate) admin.groups.add(GROUP_ADMIN_PK) return created def generate_username(self, first_name, last_name): """ Generates a username from first name and last name. """ first_name = first_name.strip() last_name = last_name.strip() if first_name and last_name: base_name = " ".join((first_name, last_name)) else: base_name = first_name or last_name if not base_name: raise ValueError( "Either 'first_name' or 'last_name' must not be " "empty." ) if not self.filter(username=base_name).exists(): generated_username = base_name else: counter = 0 while True: counter += 1 test_name = f"{base_name} {counter}" if not self.filter(username=test_name).exists(): generated_username = test_name break return generated_username def generate_password(self): """ Generates a random passwort. Do not use l, o, I, O, 1 or 0. """ chars = "abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789" size = 8 return "".join([choice(chars) for i in range(size)]) class User(RESTModelMixin, PermissionsMixin, AbstractBaseUser): """ Model for users in OpenSlides. A client can login as an user with credentials. An user can also just be used as representation for a person in other OpenSlides apps like motion submitter or (assignment) election candidates. """ access_permissions = UserAccessPermissions() USERNAME_FIELD = "username" username = models.CharField(max_length=255, unique=True, blank=True) first_name = models.CharField(max_length=255, blank=True) last_name = models.CharField(max_length=255, blank=True) gender = models.CharField(max_length=255, blank=True) email = models.EmailField(blank=True) last_email_send = models.DateTimeField(blank=True, null=True) # TODO: Try to remove the default argument in the following fields. structure_level = models.CharField(max_length=255, blank=True, default="") title = models.CharField(max_length=50, blank=True, default="") number = models.CharField(max_length=50, blank=True, default="") about_me = models.TextField(blank=True, default="") comment = models.TextField(blank=True, default="") default_password = models.CharField(max_length=100, blank=True, default="") is_active = models.BooleanField(default=True) is_present = models.BooleanField(default=False) is_committee = models.BooleanField(default=False) objects = UserManager() class Meta: default_permissions = () permissions = ( ("can_see_name", "Can see names of users"), ( "can_see_extra_data", "Can see extra data of users (e.g. present and comment)", ), ("can_change_password", "Can change its own password"), ("can_manage", "Can manage users"), ) ordering = ("last_name", "first_name", "username") def __str__(self): # Strip white spaces from the name parts first_name = self.first_name.strip() last_name = self.last_name.strip() # The user has a last_name and a first_name if first_name and last_name: name = " ".join((self.first_name, self.last_name)) # The user has only a first_name or a last_name or no name else: name = first_name or last_name or self.username # Return result return name def save(self, *args, **kwargs): """ Overridden method to skip autoupdate if only last_login field was updated as it is done during login. """ if kwargs.get("update_fields") == ["last_login"]: kwargs["skip_autoupdate"] = True return super().save(*args, **kwargs) def has_perm(self, perm): """ This method is closed. Do not use it but use openslides.utils.auth.has_perm. """ raise RuntimeError( "Do not use user.has_perm() but use openslides.utils.auth.has_perm" ) def send_invitation_email( self, connection, subject, message, skip_autoupdate=False ): """ Sends an invitation email to the users. Returns True on success, False on failiure. May raise an ValidationError, if something went wrong. """ if not self.email: return False # Custom dict class that for formatstrings with entries like {not_existent} # no error is raised and this is replaced with ''. class format_dict(dict): def __missing__(self, key): return "" message_format = format_dict( { "name": str(self), "event_name": config["general_event_name"], "url": config["users_pdf_url"], "username": self.username, "password": self.default_password, } ) try: message = message.format(**message_format) except KeyError as err: raise ValidationError({"detail": f"Invalid property {err}."}) subject_format = format_dict( {"event_name": config["general_event_name"], "username": self.username} ) try: subject = subject.format(**subject_format) except KeyError as err: raise ValidationError({"detail": f"Invalid property {err}."}) # Create an email and send it. email = mail.EmailMessage( subject, message, config["users_email_sender"] + " <" + settings.DEFAULT_FROM_EMAIL + ">", [self.email], reply_to=[config["users_email_replyto"]], ) try: count = connection.send_messages([email]) except smtplib.SMTPDataError as e: error = e.smtp_code helptext = "" if error == 554: # The server does not accept our connection. The code is # something like "transaction failed" or "No SMTP service here" helptext = " Is the email sender correct?" connection.close() raise ValidationError( {"detail": f"Error {error}. Cannot send email.{helptext}"} ) except smtplib.SMTPRecipientsRefused: pass # Run into returning false later except smtplib.SMTPAuthenticationError as e: # Nice error message on auth failure raise ValidationError( { "detail": f"Error {e.smtp_code}: Authentication failure. Please contact your local administrator." } ) else: if count == 1: self.email_send = True self.last_email_send = timezone.now() self.save(skip_autoupdate=skip_autoupdate) return True return False @property def session_auth_hash(self): """ Returns the session auth hash of a user as attribute. Needed for the django rest framework. """ return self.get_session_auth_hash() class GroupManager(_GroupManager): """ Customized manager that supports our get_full_queryset method. """ def get_full_queryset(self): """ Returns the normal queryset with all groups. In the background all permissions with the content types are prefetched from the database. """ return ( self.get_queryset() .select_related("group_ptr") .prefetch_related( Prefetch( "permissions", queryset=Permission.objects.select_related("content_type"), ) ) ) class Group(RESTModelMixin, DjangoGroup): """ Extend the django group with support of our REST and caching system. """ access_permissions = GroupAccessPermissions() objects = GroupManager() class Meta: default_permissions = () class PersonalNoteManager(models.Manager): """ Customized model manager to support our get_full_queryset method. """ def get_full_queryset(self): """ Returns the normal queryset with all personal notes. In the background all users are prefetched from the database. """ return self.get_queryset().select_related("user") class PersonalNote(RESTModelMixin, models.Model): """ Model for personal notes (e. g. likes/stars) of a user concerning different openslides objects like motions. """ access_permissions = PersonalNoteAccessPermissions() objects = PersonalNoteManager() user = models.OneToOneField(User, on_delete=CASCADE_AND_AUTOUODATE) notes = JSONField() class Meta: default_permissions = ()