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import json
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from django.db import models
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from django.db.utils import ProgrammingError, OperationalError
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from django.utils.translation import ugettext_lazy as _
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from django.conf import settings
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from common.utils import signer, get_logger
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logger = get_logger(__name__)
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class SettingQuerySet(models.QuerySet):
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def __getattr__(self, item):
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queryset = list(self)
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instances = [i for i in queryset if i.name == item]
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if len(instances) == 1:
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return instances[0]
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else:
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return Setting()
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class SettingManager(models.Manager):
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def get_queryset(self):
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return SettingQuerySet(self.model, using=self._db)
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class Setting(models.Model):
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name = models.CharField(max_length=128, unique=True, verbose_name=_("Name"))
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value = models.TextField(verbose_name=_("Value"))
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category = models.CharField(max_length=128, default="default")
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encrypted = models.BooleanField(default=False)
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enabled = models.BooleanField(verbose_name=_("Enabled"), default=True)
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comment = models.TextField(verbose_name=_("Comment"))
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objects = SettingManager()
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cache_key_prefix = '_SETTING_'
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def __str__(self):
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return self.name
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@property
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def cleaned_value(self):
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try:
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value = self.value
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if self.encrypted:
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value = signer.unsign(value)
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if not value:
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return None
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value = json.loads(value)
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return value
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except json.JSONDecodeError:
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return None
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@cleaned_value.setter
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def cleaned_value(self, item):
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try:
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v = json.dumps(item)
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if self.encrypted:
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v = signer.sign(v)
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self.value = v
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except json.JSONDecodeError as e:
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raise ValueError("Json dump error: {}".format(str(e)))
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@classmethod
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def refresh_all_settings(cls):
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try:
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settings_list = cls.objects.all()
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for setting in settings_list:
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setting.refresh_setting()
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except (ProgrammingError, OperationalError):
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pass
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@classmethod
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def refresh_item(cls, name):
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item = cls.objects.filter(name=name).first()
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if not item:
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return
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item.refresh_setting()
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def refresh_setting(self):
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logger.debug(f"Refresh setting: {self.name}")
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if hasattr(self.__class__, f'refresh_{self.name}'):
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getattr(self.__class__, f'refresh_{self.name}')()
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else:
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setattr(settings, self.name, self.cleaned_value)
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@classmethod
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def refresh_AUTH_LDAP(cls):
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setting = cls.objects.filter(name='AUTH_LDAP').first()
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if not setting:
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return
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ldap_backend = settings.AUTH_BACKEND_LDAP
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backends = settings.AUTHENTICATION_BACKENDS
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has = ldap_backend in backends
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if setting.cleaned_value and not has:
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settings.AUTHENTICATION_BACKENDS.insert(0, ldap_backend)
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if not setting.cleaned_value and has:
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index = backends.index(ldap_backend)
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backends.pop(index)
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settings.AUTH_LDAP = setting.cleaned_value
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@classmethod
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def update_or_create(cls, name='', value='', encrypted=False, category=''):
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"""
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不能使用 Model 提供的，update_or_create 因为这里有 encrypted 和 cleaned_value
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:return: (changed, instance)
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"""
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setting = cls.objects.filter(name=name).first()
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changed = False
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if not setting:
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setting = Setting(name=name, encrypted=encrypted, category=category)
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if setting.cleaned_value != value:
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setting.encrypted = encrypted
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setting.cleaned_value = value
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setting.save()
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changed = True
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return changed, setting
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class Meta:
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db_table = "settings_setting"
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verbose_name = _("Setting")
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