c3lf-system-3/core/files/models.py
jedi 1f41b81b8f add django backend in /core
ported from laravel in c3lf/lfbackend repo
2023-11-18 12:57:50 +01:00

57 lines
2.4 KiB
Python

from django.core.files.base import ContentFile
from django.db import models, IntegrityError
from django_softdelete.models import SoftDeleteModel
from inventory.models import Item
def hash_upload(instance, filename):
return f"{instance.hash[:2]}/{instance.hash[2:4]}/{instance.hash[4:6]}/{instance.hash[6:]}"
class FileManager(models.Manager):
def get_or_create(self, **kwargs):
if 'data' in kwargs and type(kwargs['data']) == str:
import base64
from hashlib import sha256
content = base64.b64decode(kwargs['data'], validate=True)
kwargs.pop('data')
content_hash = sha256(content).hexdigest()
kwargs['file'] = ContentFile(content, content_hash)
kwargs['hash'] = content_hash
else:
raise ValueError('data must be a base64 encoded string or file and hash must be provided')
try:
return self.get(hash=kwargs['hash']), False
except self.model.DoesNotExist:
return self.create(**kwargs), True
def create(self, **kwargs):
if 'data' in kwargs and type(kwargs['data']) == str:
import base64
from hashlib import sha256
content = base64.b64decode(kwargs['data'], validate=True)
kwargs.pop('data')
content_hash = sha256(content).hexdigest()
kwargs['file'] = ContentFile(content, content_hash)
kwargs['hash'] = content_hash
elif 'file' in kwargs and 'hash' in kwargs and type(kwargs['file']) == ContentFile:
pass
else:
raise ValueError('data must be a base64 encoded string or file and hash must be provided')
if not self.filter(hash=kwargs['hash']).exists():
return super().create(**kwargs)
else:
raise IntegrityError('File with this hash already exists')
class File(models.Model):
item = models.ForeignKey(Item, models.CASCADE, db_column='iid', null=True, blank=True, related_name='files')
created_at = models.DateTimeField(blank=True, null=True)
updated_at = models.DateTimeField(blank=True, null=True)
deleted_at = models.DateTimeField(blank=True, null=True)
file = models.ImageField(upload_to=hash_upload)
mime_type = models.CharField(max_length=255, null=False, blank=False)
hash = models.CharField(max_length=64, null=False, blank=False, unique=True)
objects = FileManager()