add qr code

fet2020/finance/admin.py

@@ -1,7 +1,10 @@
 from django.contrib import admin, messages
+from django.utils.html import format_html
 from django.utils.safestring import mark_safe
 from django.utils.translation import ngettext
 
+from segno import helpers
+
 from .forms import (
     BankDataAdminForm,
     BillAdminForm,
@@ -67,6 +70,7 @@ class BillAdmin(admin.ModelAdmin):
         "status_colored",
         "bill_creator",
         "affiliation",
+        "get_qrcode",
     ]
 
     actions = ["make_cleared", "make_finished"]
@@ -171,6 +175,27 @@ class BillAdmin(admin.ModelAdmin):
 
         return f"{ tmp.bic }"
 
+    @admin.display(description="QR Code")
+    def get_qrcode(self, obj):
+        if obj.status != "C":
+            return "-"
+
+        try:
+            tmp = BankData.objects.get(id=obj.bankdata.id)
+        except Exception:
+            return "-"
+
+        qrcode = helpers.make_epc_qr(
+            name=tmp.name,
+            iban=tmp.iban,
+            amount=obj.amount,
+            text=obj.purpose,
+            bic=tmp.bic,
+            encoding="utf-8",
+        )
+        uri = qrcode.png_data_uri(scale=3.0)
+        return format_html(f'<img src="{uri}">')
+
     @admin.display(description="Status")
     def status_colored(self, obj):
         # TODO: if there is a status without color, set nothing.