muk_base/muk_attachment_lobject/models/ir_attachment.py

## -*- coding: utf-8 -*-

###################################################################################
# 
#    MuK Document Management System
#
#    Copyright (C) 2018 MuK IT GmbH
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as
#    published by the Free Software Foundation, either version 3 of the
#    License, or (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
###################################################################################

import base64
import hashlib
import itertools
import logging
import mimetypes
import os
import re
from collections import defaultdict

from odoo import api, fields, models, tools, SUPERUSER_ID, _
from odoo.exceptions import AccessError, ValidationError
from odoo.tools import config, human_size, ustr, html_escape
from odoo.tools.mimetypes import guess_mimetype

from odoo.addons.muk_fields_lobject import fields as lobject_fields

_logger = logging.getLogger(__name__)

class LObjectIrAttachment(models.Model):
    
    _inherit = 'ir.attachment'

    store_lobject = lobject_fields.LargeObject(
        string="Data")
    
    @api.model
    def force_storage(self):
        """Override force_storage without calling super,
           cause domain need to be edited."""
        if not self.env.user._is_admin():
            raise AccessError(_('Only administrators can execute this action.'))
        for attach in self.search(['|', ['res_field', '=', False], ['res_field', '!=', False]]):
            attach.write({'datas': attach.datas})
        return True
    
    @api.depends('store_fname', 'db_datas', 'store_lobject')
    def _compute_datas(self):
        bin_size = self._context.get('bin_size')
        for attach in self:
            if attach.store_lobject:
                if bin_size:
                    attach.datas = attach.store_lobject
                else:
                    attach.datas = base64.b64encode(attach.store_lobject)
            else:
                super(LObjectIrAttachment, attach)._compute_datas()
        
    def _inverse_datas(self):
        location = self._storage()
        for attach in self:
            if location == 'lobject':
                value = attach.datas
                bin_data = base64.b64decode(value) if value else b''
                vals = {
                    'file_size': len(bin_data),
                    'checksum': self._compute_checksum(bin_data),
                    'index_content': self._index(bin_data, attach.datas_fname, attach.mimetype),
                    'store_fname': False,
                    'db_datas': False,
                    'store_lobject': bin_data,
                }
                fname = attach.store_fname
                super(LObjectIrAttachment, attach.sudo()).write(vals)
                if fname:
                    self._file_delete(fname)
            else:
                super(LObjectIrAttachment, attach)._inverse_datas()