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###################################################################################
#
# Copyright (c) 2017-2019 MuK IT GmbH.
#
# This file is part of MuK Large Objects Field
# (see https://mukit.at).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
###################################################################################
import base64
import hashlib
import logging
import binascii
import tempfile
from odoo import fields
from odoo.tools import human_size
_logger = logging.getLogger(__name__)
class LargeObject(fields.Field):
type = 'lobject'
column_type = ('oid', 'oid')
_slots = {
'prefetch': False,
'context_dependent': True,
}
def convert_to_column(self, value, record, values=None, validate=True):
oid = record.with_context({'oid': True})[self.name]
if oid:
record.env.cr._cnx.lobject(oid, 'rb').unlink()
if not value:
return None
lobject = record.env.cr._cnx.lobject(0, 'wb')
if isinstance(value, bytes):
lobject.write(value)
elif isinstance(value, str):
lobject.write(base64.b64decode(value))
else:
while True:
chunk = value.read(4096)
if not chunk:
break
lobject.write(chunk)
return lobject.oid
def convert_to_record(self, value, record):
if value and isinstance(value, int):
lobject = record.env.cr._cnx.lobject(value, 'rb')
if record._context.get('human_size'):
return human_size(lobject.seek(0, 2))
elif record._context.get('bin_size'):
return lobject.seek(0, 2)
elif record._context.get('oid'):
return lobject.oid
elif record._context.get('base64'):
return base64.b64encode(lobject.read())
elif record._context.get('stream'):
file = tempfile.TemporaryFile()
while True:
chunk = lobject.read(4096)
if not chunk:
file.seek(0)
return file
file.write(chunk)
elif record._context.get('checksum'):
checksum = hashlib.sha1()
while True:
chunk = lobject.read(4096)
if not chunk:
return checksum.hexdigest()
checksum.update(chunk)
else:
return lobject.read()
return value
def convert_to_export(self, value, record):
if value:
lobject = record.env.cr._cnx.lobject(value, 'rb')
if record._context.get('export_raw_data'):
return lobject.read()
return base64.b64encode(lobject.read())
return ''