product_print_zpl_barcode: Add field barcode_image for EAN13 and EAN8 on product.product

product_print_zpl_barcode/__manifest__.py

@@ -41,6 +41,7 @@ This module has been written by Alexis de Lattre from Akretion
         'barcodes',
         'base_report_to_printer',
         ],
+    'external_dependencies': {'python': ['python-barcode>=0.14.0']},
     'data': [
         'security/ir.model.access.csv',
         'wizard/product_print_zpl_barcode_view.xml',

product_print_zpl_barcode/models/product.py

@@ -1,11 +1,14 @@
-# -*- coding: utf-8 -*-
-# Copyright 2020 Akretion France (http://www.akretion.com/)
+# Copyright 2020-2023 Akretion France (http://www.akretion.com/)
 # @author: Alexis de Lattre <alexis.delattre@akretion.com>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 from odoo import api, fields, models, _
 from odoo.exceptions import UserError
-from stdnum.ean import calc_check_digit
+from stdnum.ean import calc_check_digit, is_valid
+from barcode import EAN13, EAN8
+from barcode.writer import ImageWriter
+import base64
+import io
 
 
 class ProductTemplate(models.Model):
@@ -34,8 +37,8 @@ class ProductTemplate(models.Model):
                 "print_zpl_barcode_from_product_template on product '%s' "
                 "because it has %d variants and not just one.")
                 % (self.display_name, self.product_variant_count))
-        action = self.env.ref(
-            'product_print_zpl_barcode.product_print_zpl_barcode_action').sudo().read()[0]
+        action = self.env["ir.actions.actions"]._for_xml_id(
+            'product_print_zpl_barcode.product_print_zpl_barcode_action')
         action['context'] = {
             'active_id': self.product_variant_ids[0].id,
             'active_model': 'product.product',
@@ -46,6 +49,30 @@ class ProductTemplate(models.Model):
 class ProductProduct(models.Model):
     _inherit = 'product.product'
 
+    # Not useful for ZPL, but it is often useful to have a barcode image field
+    barcode_image = fields.Binary(
+        compute='_compute_barcode_image',
+        string='Barcode Image')
+
+    @api.depends('barcode')
+    def _compute_barcode_image(self):
+        for product in self:
+            barcode = product.barcode
+            barcode_image = False
+            if barcode:
+                barcode_obj = False
+                if len(barcode) == 13 and is_valid(barcode):
+                    barcode_obj = EAN13(barcode, writer=ImageWriter(), guardbar=True)
+                elif len(barcode) == 8 and is_valid(barcode):
+                    barcode_obj = EAN8(barcode, writer=ImageWriter(), guardbar=True)
+                if barcode_obj:
+                    barcode_file = io.BytesIO()
+                    barcode_obj.write(barcode_file)  # generate PNG
+                    barcode_file.seek(0)
+                    barcode_img = barcode_file.read()
+                    barcode_image = base64.b64encode(barcode_img)
+            product.barcode_image = barcode_image
+
     def generate_barcode_from_product_product(self):
         self.ensure_one()
         if self.barcode:

product_print_zpl_barcode/wizard/product_print_zpl_barcode.py

@@ -270,7 +270,8 @@ class ProductPrintZplBarcode(models.TransientModel):
             'zpl_filename': 'barcode_%s.zpl' % vals['barcode'],
             })
         self.write(vals)
-        action = self.env.ref('product_print_zpl_barcode.product_print_zpl_barcode_action').sudo().read()[0]
+        action = self.env["ir.actions.actions"]._for_xml_id(
+            'product_print_zpl_barcode.product_print_zpl_barcode_action')
         action.update({
             'res_id': self.id,
             'context': self._context,
@@ -285,7 +286,8 @@ class ProductPrintZplBarcode(models.TransientModel):
             self.zpl_filename, base64.decodebytes(self.zpl_file), format='raw')
         action = True
         if self._context.get('print_and_new'):
-            action = self.env.ref('product_print_zpl_barcode.product_print_zpl_barcode_action').sudo().read()[0]
+            action = self.env["ir.actions.actions"]._for_xml_id(
+                'product_print_zpl_barcode.product_print_zpl_barcode_action')
             action.update({
                 'views': False,
                 'context': self._context,