2019-03-11 02:06:45 +00:00
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# -*- coding: utf-8 -*-
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#
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import json
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from django.db import models
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from django.utils.translation import ugettext_lazy as _
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2020-06-11 04:10:00 +00:00
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from django.utils.encoding import force_text
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2019-03-11 02:06:45 +00:00
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2020-10-28 09:28:15 +00:00
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from ..utils import signer, crypto
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2019-03-11 02:06:45 +00:00
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__all__ = [
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'JsonMixin', 'JsonDictMixin', 'JsonListMixin', 'JsonTypeMixin',
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'JsonCharField', 'JsonTextField', 'JsonListCharField', 'JsonListTextField',
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'JsonDictCharField', 'JsonDictTextField', 'EncryptCharField',
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2019-05-20 11:39:53 +00:00
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'EncryptTextField', 'EncryptMixin', 'EncryptJsonDictTextField',
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2019-12-18 07:37:53 +00:00
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'EncryptJsonDictCharField',
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2019-03-11 02:06:45 +00:00
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]
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class JsonMixin:
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tp = None
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@staticmethod
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def json_decode(data):
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try:
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return json.loads(data)
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except (TypeError, json.JSONDecodeError):
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return None
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@staticmethod
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def json_encode(data):
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return json.dumps(data)
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2020-11-19 07:50:31 +00:00
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def from_db_value(self, value, expression, connection, context=None):
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2019-03-11 02:06:45 +00:00
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if value is None:
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return value
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return self.json_decode(value)
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def to_python(self, value):
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if value is None:
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return value
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if not isinstance(value, str) or not value.startswith('"'):
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return value
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else:
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return self.json_decode(value)
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def get_prep_value(self, value):
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if value is None:
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return value
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return self.json_encode(value)
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class JsonTypeMixin(JsonMixin):
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tp = dict
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2020-11-19 07:50:31 +00:00
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def from_db_value(self, value, expression, connection, context=None):
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2019-03-11 02:06:45 +00:00
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value = super().from_db_value(value, expression, connection, context)
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if not isinstance(value, self.tp):
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value = self.tp()
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return value
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def to_python(self, value):
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data = super().to_python(value)
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if not isinstance(data, self.tp):
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data = self.tp()
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return data
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def get_prep_value(self, value):
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if not isinstance(value, self.tp):
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value = self.tp()
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return self.json_encode(value)
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class JsonDictMixin(JsonTypeMixin):
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tp = dict
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class JsonDictCharField(JsonDictMixin, models.CharField):
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description = _("Marshal dict data to char field")
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class JsonDictTextField(JsonDictMixin, models.TextField):
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description = _("Marshal dict data to text field")
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class JsonListMixin(JsonTypeMixin):
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tp = list
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class JsonStrListMixin(JsonListMixin):
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pass
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class JsonListCharField(JsonListMixin, models.CharField):
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description = _("Marshal list data to char field")
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class JsonListTextField(JsonListMixin, models.TextField):
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description = _("Marshal list data to text field")
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class JsonCharField(JsonMixin, models.CharField):
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description = _("Marshal data to char field")
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class JsonTextField(JsonMixin, models.TextField):
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description = _("Marshal data to text field")
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class EncryptMixin:
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2019-12-18 07:37:53 +00:00
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"""
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EncryptMixin要放在最前面
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"""
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2020-06-11 06:10:55 +00:00
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def decrypt_from_signer(self, value):
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return signer.unsign(value) or ''
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2020-11-19 07:50:31 +00:00
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def from_db_value(self, value, expression, connection, context=None):
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2019-12-18 07:37:53 +00:00
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if value is None:
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return value
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2020-06-11 04:10:00 +00:00
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value = force_text(value)
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2020-10-28 09:28:15 +00:00
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plain_value = crypto.decrypt(value)
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2020-06-11 04:10:00 +00:00
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# 如果没有解开,使用原来的signer解密
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if not plain_value:
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2020-06-11 06:10:55 +00:00
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plain_value = self.decrypt_from_signer(value)
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# 可能和Json mix,所以要先解密,再json
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2019-12-18 07:37:53 +00:00
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sp = super()
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if hasattr(sp, 'from_db_value'):
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2020-06-11 04:10:00 +00:00
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plain_value = sp.from_db_value(plain_value, expression, connection, context)
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return plain_value
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2019-03-11 02:06:45 +00:00
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def get_prep_value(self, value):
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if value is None:
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return value
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2020-06-11 06:10:55 +00:00
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# 先 json 再解密
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2019-12-18 07:37:53 +00:00
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sp = super()
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if hasattr(sp, 'get_prep_value'):
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value = sp.get_prep_value(value)
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2020-06-11 04:10:00 +00:00
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value = force_text(value)
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# 替换新的加密方式
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2020-10-28 09:28:15 +00:00
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return crypto.encrypt(value)
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2019-03-11 02:06:45 +00:00
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class EncryptTextField(EncryptMixin, models.TextField):
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description = _("Encrypt field using Secret Key")
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class EncryptCharField(EncryptMixin, models.CharField):
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2019-06-24 14:16:39 +00:00
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@staticmethod
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def change_max_length(kwargs):
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kwargs.setdefault('max_length', 1024)
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max_length = kwargs.get('max_length')
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if max_length < 129:
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max_length = 128
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max_length = max_length * 2
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kwargs['max_length'] = max_length
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2019-03-11 02:06:45 +00:00
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def __init__(self, *args, **kwargs):
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2019-06-24 14:16:39 +00:00
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self.change_max_length(kwargs)
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2019-03-11 02:06:45 +00:00
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super().__init__(*args, **kwargs)
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2019-06-24 14:16:39 +00:00
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def deconstruct(self):
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name, path, args, kwargs = super().deconstruct()
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max_length = kwargs.pop('max_length')
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if max_length > 255:
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max_length = max_length // 2
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kwargs['max_length'] = max_length
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return name, path, args, kwargs
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2019-03-11 02:06:45 +00:00
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2019-05-20 11:39:53 +00:00
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class EncryptJsonDictTextField(EncryptMixin, JsonDictTextField):
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pass
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2019-03-11 02:06:45 +00:00
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2019-12-18 07:37:53 +00:00
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class EncryptJsonDictCharField(EncryptMixin, JsonDictCharField):
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pass
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