first version of send mail with dummy backend and confirm action

cntmanage/flightslot/actions/send_email.py

@@ -0,0 +1,62 @@
+from django.conf import settings
+from django.contrib import messages
+from django.core.mail import EmailMultiAlternatives
+from django.http import HttpRequest
+from django.db.models.query import QuerySet
+from django.utils.safestring import SafeText
+from django.template.loader import render_to_string
+
+from ..models.students import Student
+
+from smtplib import SMTPException
+from email.mime.image import MIMEImage
+
+import os
+
+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:
+        messages.error(request=request, message="Cannot Load CantorAir Logo")
+        return
+
+    for student in queryset:
+        if not student.user or not student.email: # skip student if has not an associated user
+            continue
+        try:
+            username: str = student.user.username
+            password: str = student.default_password()
+            address: str = student.email
+
+            text_message: str = f"Cantor Air Flight Scheduler\nUsername:{username}\nPassword:{password}\n"
+
+            html_message: SafeText = render_to_string(
+                template_name="email/mail.html",
+                context={"username": username, "password": password}
+            )
+
+            mail: EmailMultiAlternatives = EmailMultiAlternatives(
+                subject="CantorAir Flight Scheduler 🛫",
+                from_email="ema.trabattoni@gmail.com",
+                body=text_message, 
+                to = [ address ]
+            )
+            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}")
+        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