# The core application of the Mia project. # by imacat , 2020/6/29 # Copyright (c) 2020 imacat. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """The data models of the Mia core application. """ import hashlib from dirtyfields import DirtyFieldsMixin from django.conf import settings from django.db import models, connection, OperationalError, transaction, \ ProgrammingError from django.db.models.functions import Now from mia_core.utils import get_multi_lingual_attr, set_multi_lingual_attr, \ new_pk class Country(DirtyFieldsMixin, models.Model): """A country.""" id = models.PositiveIntegerField(primary_key=True, db_column="sn") code = models.CharField(max_length=2, unique=True, db_column="id") name_en = models.CharField(max_length=64) name_zh_hant = models.CharField( max_length=32, null=True, db_column="name_zhtw") name_zh_hans = models.CharField( max_length=32, null=True, db_column="name_zhcn") is_special = models.BooleanField( default=False, db_column="special") created_at = models.DateTimeField( auto_now_add=True, db_column="created") created_by = models.ForeignKey( "User", on_delete=models.PROTECT, db_column="createdby", related_name="created_countries") updated_at = models.DateTimeField( auto_now=True, db_column="updated") updated_by = models.ForeignKey( "User", on_delete=models.PROTECT, db_column="updatedby", related_name="updated_countries") def __str__(self): """Returns the string representation of this country.""" return self.code.__str__() + " " + self.name.__str__() @property def name(self) -> str: """The country name in the current language.""" return get_multi_lingual_attr(self, "name", "en") @name.setter def name(self, value: str) -> None: set_multi_lingual_attr(self, "name", value) class Meta: db_table = "country" class User(DirtyFieldsMixin, models.Model): """A user.""" id = models.PositiveIntegerField(primary_key=True, db_column="sn") login_id = models.CharField(max_length=32, unique=True, db_column="id") password = models.CharField(max_length=32, db_column="passwd") name = models.CharField(max_length=32) is_disabled = models.BooleanField( default=False, db_column="disabled") is_deleted = models.BooleanField( default=False, db_column="deleted") language = models.CharField(max_length=6, null=True, db_column="lang") visits = models.PositiveSmallIntegerField(default=0) visited_at = models.DateTimeField(null=True, db_column="visited") visited_ip = models.GenericIPAddressField(null=True, db_column="ip") visited_host = models.CharField( max_length=128, null=True, db_column="host") visited_country = models.ForeignKey( Country, on_delete=models.PROTECT, null=True, db_column="ct", to_field="code", related_name="users") created_at = models.DateTimeField( auto_now_add=True, db_column="created") created_by = models.ForeignKey( "self", on_delete=models.PROTECT, db_column="createdby", related_name="created_users") updated_at = models.DateTimeField( auto_now_add=True, db_column="updated") updated_by = models.ForeignKey( "self", on_delete=models.PROTECT, db_column="updatedby", related_name="updated_users") REQUIRED_FIELDS = ["id", "name"] USERNAME_FIELD = "login_id" def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.current_user = None @property def is_anonymous(self) -> bool: return False @property def is_authenticated(self) -> bool: return True def set_password(self): pass def check_password(self): pass def __str__(self): """Returns the string representation of this user.""" return "%s (%s)" % ( self.name.__str__(), self.login_id.__str__()) def save(self, force_insert=False, force_update=False, using=None, update_fields=None): if self.pk is None: self.pk = new_pk(User) if self.current_user is not None: self.created_by = self.current_user if self.current_user is not None: self.updated_by = self.current_user with transaction.atomic(): super(User, self).save( force_insert=force_insert, force_update=force_update, using=using, update_fields=update_fields) User.objects.filter(pk=self.pk).update(updated_at=Now()) class Meta: db_table = "users" app_label = "mia_core" def set_digest_password(self, login_id, password): self.password = self.md5( F"{login_id}:{settings.DIGEST_REALM}:{password}") @staticmethod def md5(value: str) -> str: m = hashlib.md5() m.update(value.encode("utf-8")) return m.hexdigest() def is_in_use(self) -> bool: """Returns whether this user is in use. Returns: True if this user is in use, or False otherwise. """ for table in connection.introspection.table_names(): if self._is_in_use_with(F"SELECT * FROM {table}" " WHERE createdby=%s OR updatedby=%s"): return True if self._is_in_use_with( F"SELECT * FROM {table}" " WHERE created_by_id=%s OR updated_by_id=%s"): return True return False def _is_in_use_with(self, sql: str) -> bool: """Returns whether this user is in use with a specific SQL statement. Args: sql: The SQL query statement Returns: True if this user is in use, or False otherwise. """ with connection.cursor() as cursor: try: cursor.execute(sql, [self.pk, self.pk]) except OperationalError: return False except ProgrammingError: return False if cursor.fetchone() is None: return False return True