Fixed static and template email files for container

cntmanage/flightslot/actions/send_email.py

@@ -1,6 +1,6 @@
-from django.conf import settings
+from django.contrib.staticfiles import finders
 from django.contrib import messages
-from django.core.mail import EmailMultiAlternatives
+from django.core.mail import EmailMultiAlternatives, get_connection
 from django.http import HttpRequest
 from django.db.models.query import QuerySet
 from django.utils.safestring import SafeText
@@ -11,24 +11,27 @@ from ..models.students import Student
 from smtplib import SMTPException
 from email.mime.image import MIMEImage
 
-import os
+from typing import List
 
 def send_mail_password(request: HttpRequest, queryset: QuerySet[Student]) -> None:
     img: MIMEImage | None = None
-    try:
-        for d in settings.STATICFILES_DIRS:
-            filename = os.path.join(d, "cantorair.png")
-            if not os.path.exists(filename):
-                continue
-            with open(filename, "rb") as f:
-                img = MIMEImage(f.read())
-                img.add_header("Content-ID", "logo_image")
-                img.add_header("Content-Disposition", "inline", filename="cantorair.png")
-                break
-    except:
+    filename: str
+    candidates = finders.find("cantorair.png")
+    if not candidates:
         messages.error(request=request, message="Cannot Load CantorAir Logo")
         return
+    elif isinstance(candidates, list):
+        filename = candidates.pop()
+    else:
+        filename = candidates
 
+    with open(filename, "rb") as f:
+        img = MIMEImage(f.read())
+        img.add_header("Content-ID", "logo_image")
+        img.add_header("Content-Disposition", "inline", filename="cantorair.png")     
+    
+    # build mail list filling template
+    mails: List[EmailMultiAlternatives] = []
     for student in queryset:
         if not student.user or not student.email: # skip student if has not an associated user
             continue
@@ -52,11 +55,19 @@ def send_mail_password(request: HttpRequest, queryset: QuerySet[Student]) -> Non
             )
             mail.attach(filename=img)
             mail.attach_alternative(content=html_message, mimetype="text/html")
-            mail.send()
-        except SMTPException as e:
-            messages.error(request=request, message=f"Send Mail error: {e.strerror}")
+            mails.append(mail)
         except Exception as e:
             messages.error(request=request, message=f"General Error: {e}")
-        else:
-            messages.success(request=request, message=f"Email Sent To: {student.surname} {student.name[0].upper()}. -> {mail.to.pop()}")
-    return
+    
+    # Open only one conenction and send mass email
+    try:
+        with get_connection() as conn:
+            conn.send_messages(mails)
+    except SMTPException as e:
+        messages.error(request=request, message=f"Send Mail SMTP error: {e.strerror}")
+    except Exception as e:
+        messages.error(request=request, message=f"Send Mail General error: {e}")
+    else:
+        messages.success(request=request, message=f"Successfully sent {len(mails)} messages")
+    
+    return