mia-accounting-django/mia_core/models.py

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# The core application of the Mia project.
# by imacat <imacat@mail.imacat.idv.tw>, 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.
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"""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
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from mia_core.utils import get_multi_lingual_attr, set_multi_lingual_attr, \
new_pk
class Country(DirtyFieldsMixin, models.Model):
"""A country."""
sn = models.PositiveIntegerField(primary_key=True)
code = models.CharField(max_length=2, unique=True)
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):
return get_multi_lingual_attr(self, "name", "en")
@name.setter
def name(self, value):
set_multi_lingual_attr(self, "name", value)
class Meta:
db_table = "countries"
class User(DirtyFieldsMixin, models.Model):
"""A user."""
sn = models.PositiveIntegerField(primary_key=True)
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(null=True)
visited_at = models.DateTimeField(null=True, db_column="visited")
visited_ip = models.GenericIPAddressField(null=True, db_column="ip")
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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=True, db_column="updated")
updated_by = models.ForeignKey(
"self", on_delete=models.PROTECT,
db_column="updatedby", related_name="updated_users")
REQUIRED_FIELDS = ["sn", "name"]
USERNAME_FIELD = "login_id"
@property
def is_anonymous(self):
return False
@property
def is_authenticated(self):
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, current_user=None, force_insert=False, force_update=False,
using=None, update_fields=None):
if self.pk is None:
self.pk = new_pk(User)
if current_user is not None:
self.created_by = current_user
if current_user is not None:
self.updated_by = current_user
with transaction.atomic():
super(User, self).save(
force_insert=force_insert, force_update=force_update,
using=using, update_fields=update_fields)
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):
m = hashlib.md5()
m.update(value.encode("utf-8"))
return m.hexdigest()
def is_in_use(self):
"""Returns whether this user is in use.
Returns:
bool: 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):
"""Returns whether this user is in use with a specific SQL statement.
Args:
sql (str): The SQL query statement
Returns:
bool: 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
if cursor.fetchone() is None:
return False
return True