Add barcode to comprovante de protocolo

protocoloadm/views.py

@@ -1,3 +1,5 @@
+from sapl.utils import create_barcode_128_as_base64_png
+
 from datetime import date, datetime
 from re import sub
 
@@ -321,7 +323,12 @@ class ComprovanteProtocoloView(TemplateView):
         numero = self.kwargs['pk']
         ano = self.kwargs['ano']
         protocolo = Protocolo.objects.get(ano=ano, numero=numero)
-        return self.render_to_response({"protocolo": protocolo})
+
+        # numero is string, padd with zeros left via .zfill()
+        base64_data = create_barcode_128_as_base64_png(numero.zfill(6))
+        barcode = 'data:image/png;base64,{0}'.format(base64_data)
+
+        return self.render_to_response({"protocolo": protocolo, "barcode": barcode})
 
 
 class ProtocoloMateriaView(FormMixin, GenericView):

sapl/utils.py

@@ -32,6 +32,17 @@ def xstr(s):
     return '' if s is None else str(s)
 
 
+def create_barcode_128_as_base64_png(value):
+    from base64 import b64encode
+    from reportlab.pdfgen import canvas
+    from reportlab.lib.units import mm, inch
+    from reportlab.graphics.barcode import createBarcodeDrawing
+
+    barcode = createBarcodeDrawing('Code128', value = value, barWidth = 170, height=50, fontSize = 2, humanReadable = True)
+    data = b64encode(barcode.asString('png'))
+    return data.decode('utf-8')
+
+
 def make_choices(*choice_pairs):
     assert len(choice_pairs) % 2 == 0
     ipairs = iter(choice_pairs)

templates/protocoloadm/comprovante.html

@@ -36,7 +36,11 @@
 		<tr> <td colspan="2" align="center"><b>COMPROVANTE DE PROTOCOLO</b></td> </tr>
 
 		<tr>
-			<td>Código de Barra</td>
+			<td><center>
+					<img src="{{barcode}}" height="50px" width="170px">
+					<br>
+					{{ protocolo.numero|stringformat:'06d' }}
+				</center></td>
 			<td align="center">Autenticação ??</td>
 		</tr>