# Bcc mail sending

* extends mailer class with bcc based mailing
* switches all team based mail sending (multiple mail adresses) to bcc based mailing
* adds smaller versions of tech-croc error images for 4xx and 5xx errors for faster rendering

konova/utils/mailer.py

@@ -5,7 +5,7 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 09.11.20
 
 """
-from django.core.mail import send_mail
+from django.core.mail import send_mail, EmailMultiAlternatives
 from django.template.loader import render_to_string
 from django.utils.translation import gettext_lazy as _
 
@@ -45,6 +45,19 @@ class Mailer:
             auth_password=self.auth_password
         )
 
+    def send_via_bcc(self, recipient_list: list, subject: str, msg: str):
+        """
+        Sends a mail with subject and message where recipients will be masked via bcc
+        """
+        email_obj = EmailMultiAlternatives(
+            subject,
+            msg,
+            self.from_mail,
+            bcc=recipient_list,
+        )
+        email_obj.attach_alternative(msg, "text/html")
+        return email_obj.send(fail_silently=self.fail_silently)
+
     def send_mail_shared_access_removed(self, obj, user, municipals_names):
         """ Send a mail if user has no access to the object anymore
 
@@ -115,7 +128,7 @@ class Mailer:
         }
         msg = render_to_string("email/sharing/shared_access_given_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared access given").format(obj.identifier),
             msg
@@ -141,7 +154,7 @@ class Mailer:
         }
         msg = render_to_string("email/sharing/shared_access_removed_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared access removed").format(obj.identifier),
             msg
@@ -167,7 +180,7 @@ class Mailer:
         }
         msg = render_to_string("email/recording/shared_data_unrecorded_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared data unrecorded").format(obj.identifier),
             msg
@@ -193,7 +206,7 @@ class Mailer:
         }
         msg = render_to_string("email/recording/shared_data_recorded_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared data recorded").format(obj.identifier),
             msg
@@ -219,7 +232,7 @@ class Mailer:
         }
         msg = render_to_string("email/checking/shared_data_checked_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared data checked").format(obj.identifier),
             msg
@@ -244,7 +257,7 @@ class Mailer:
         }
         msg = render_to_string("email/other/deduction_changed_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Deduction changed").format(obj.identifier),
             msg
@@ -270,7 +283,7 @@ class Mailer:
         }
         msg = render_to_string("email/deleting/shared_data_deleted_team.html", context)
         user_mail_address = users_to_notify.values_list("email", flat=True)
-        self.send(
+        self.send_via_bcc(
             user_mail_address,
             _("{} - Shared data deleted").format(obj.identifier),
             msg