feat: add delivery more plateform independant (#362)

delivery_carrier_label/README.rst

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+Shipping label external location
+--------------------------------
+
+* Add external storage location management for shipping label.

delivery_carrier_label/__init__.py

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+# -*- coding: utf-8 -*-
+# © 2022 Vincent Renaville (Camptocamp)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import models

delivery_carrier_label/__openerp__.py

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+# -*- coding: utf-8 -*-
+# © 2022 Vincent Renaville (Camptocamp)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    'name': 'External storage - Shipping Label',
+    'version': '9.0.1.0.0',
+    'author': 'Camptocamp',
+    'license': 'AGPL-3',
+    'category': 'Knowledge Management',
+    'website': 'http://www.camptocamp.com',
+    'images': [],
+    'depends': [
+        'base_delivery_carrier_label',
+        'base_attachment_object_storage',
+    ],
+    'data': [
+    ],
+    'test': [],
+    'installable': True,
+    'auto_install': True,
+}

delivery_carrier_label/models/__init__.py

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+# -*- coding: utf-8 -*-
+# © 2022 Vincent Renaville (Camptocamp)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import shipping_label

delivery_carrier_label/models/shipping_label.py

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+# -*- coding: utf-8 -*-
+from openerp import api, fields, models
+
+
+class ShippingLabel(models.Model):
+    """Inherit of shipping label to store datas
+    in the right location if external stroage activated"""
+
+    _inherit = "shipping.label"
+
+    datas = fields.Binary(
+        compute="_compute_datas",
+        inverse="_inverse_datas",
+        string="File Content",
+        nodrop=True,
+    )
+
+    @api.depends("store_fname", "db_datas")
+    def _compute_datas(self):
+        for label in self:
+            values = label.attachment_id._data_get("datas", None)
+            label.datas = values.get(label.id)
+
+    def _inverse_datas(self):
+        # override in order to store files that need fast access,
+        # we keep them in the database instead of the object storage
+        for label in self:
+            location = label.attachment_id._storage()
+            if (
+                location == label.attachment_id._get_stores()
+                and self.attachment_id._save_in_db_anyway()
+            ):
+                # compute the fields that depend on datas
+                value = label.datas
+                bin_data = value and value.decode("base64") or ""
+                vals = {
+                    "file_size": len(bin_data),
+                    "checksum": self.attachment_id._compute_checksum(bin_data),
+                    "db_datas": value,
+                    # we seriously don't need index content on those fields
+                    "index_content": False,
+                    "store_fname": False,
+                }
+                fname = label.store_fname
+                # write as superuser, as user probably does not
+                # have write access
+                super(ShippingLabel, label.sudo()).write(vals)
+                if fname:
+                    self.attachment_id._file_delete(fname)
+                continue
+            self.attachment_id._data_set("datas", label.datas, None)