Add qrcode converter

qr_code.py

+##############################################################################
+#
+#    Converter Odoo module
+#    Copyright © 2020, 2025 XCG Consulting <https://xcg-consulting.fr>
+#
+#    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 io
+from collections.abc import Mapping
+from typing import Any
+
+from odoo import models  # type: ignore[import-untyped]
+
+from .base import Converter
+
+_qrcode: None | Exception = None
+try:
+    import qrcode  # type: ignore[import-untyped]
+except ImportError as e:
+    _qrcode = e
+
+
+def QRToImage(qr):
+    """Generate a image dict from a QR Code"""
+    img = qr.make_image(fill="black", back_color="white")
+    buffered = io.BytesIO()
+    img.save(buffered, format="PNG")
+
+    body = base64.b64encode(buffered.getvalue()).decode("ascii")
+    return {"body": body, "mime-type": "image/png"}
+
+
+def stringToQRCode(data: str):
+    """Generate a QR code from a string and return it as a base64-encoded image."""
+    if not data:
+        return False
+
+    if _qrcode is not None:
+        raise _qrcode
+
+    qr = qrcode.QRCode(
+        version=1,
+        error_correction=qrcode.constants.ERROR_CORRECT_L,
+        box_size=10,
+        border=4,
+    )
+    qr.add_data(data)
+    qr.make(fit=True)
+    return qr
+
+
+class QRCodeFile(Converter):
+    def __init__(self, fieldname):
+        self.fieldname = fieldname
+
+    def odoo_to_message(
+        self, instance: models.Model, ctx: Mapping | None = None
+    ) -> Any:
+        value = getattr(instance, self.fieldname)
+
+        if not value:
+            return {}
+
+        return QRToImage(stringToQRCode(value))
+
+
+class QRCodeDataURL(Converter):
+    def __init__(self, fieldname):
+        self.fieldname = fieldname
+
+    def odoo_to_message(
+        self, instance: models.Model, ctx: Mapping | None = None
+    ) -> Any:
+        value = getattr(instance, self.fieldname)
+
+        if not value:
+            return ""
+
+        image = QRToImage(stringToQRCode(value))
+        return "data:{};base64,{}".format(
+            image["mime-type"],
+            image["body"],
+        )