Remove old dependency on django_qr_code

InvenTree/report/templatetags/barcode.py

@@ -0,0 +1,64 @@
+"""
+Template tags for rendering various barcodes
+"""
+
+import os
+import base64
+
+from io import BytesIO
+
+
+from django import template
+
+import qrcode
+import barcode
+
+register = template.Library()
+
+
+def image_data(img, fmt='PNG'):
+    """
+    Convert an image into HTML renderable data
+
+    Returns a string ``data:image/FMT;base64,xxxxxxxxx`` which can be rendered to an <img> tag
+    """
+
+    buffered = BytesIO()
+    img.save(buffered, format=fmt)
+    
+    img_str = base64.b64encode(buffered.getvalue())
+
+    return f"data:image/{fmt.lower()};charset=utf-8;base64," + img_str.decode()
+
+
+@register.simple_tag()
+def qr_code(data, **kwargs):
+    """
+    Return a byte-encoded QR code image
+
+    Optional kwargs
+    ---------------
+
+    fill_color: Fill color (default = black)
+    back_color: Background color (default = white)
+    """
+
+    # Construct "default" values
+    params = dict(
+        box_size=20,
+        border=1,
+    )
+
+    fill_color = kwargs.pop('fill_color', 'black')
+    back_color = kwargs.pop('back_color', 'white')
+
+    params.update(**kwargs)
+
+    qr = qrcode.QRCode(**params)
+
+    qr.add_data(data, optimize=20)
+    qr.make(fit=True)
+
+    qri = qr.make_image(fill_color=fill_color, back_color=back_color)
+
+    return image_data(qri)