contacts: Add field to represent the mailout the unsubscribe came from

conservancy/contacts/admin.py

@@ -5,4 +5,5 @@ from .models import Unsubscription
 
 @admin.register(Unsubscription)
 class UnsubscriptionAdmin(admin.ModelAdmin):
-    list_display = ['created', 'email']
+    list_display = ['created', 'email', 'mailout']
+    search_fields = ['email', 'mailout']

conservancy/contacts/migrations/0002_unsubscription_mailout.py

@@ -0,0 +1,19 @@
+# Generated by Django 4.2.11 on 2024-04-10 02:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contacts', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='unsubscription',
+            name='mailout',
+            field=models.SlugField(default=''),
+            preserve_default=False,
+        ),
+    ]

conservancy/contacts/models.py

@@ -4,6 +4,7 @@ from django.db import models
 class Unsubscription(models.Model):
     created = models.DateTimeField(auto_now_add=True, blank=True)
     email = models.EmailField()
+    mailout = models.SlugField()
 
     class Meta:
         ordering = ['created']

conservancy/contacts/views.py

@@ -11,17 +11,27 @@ logger = logging.getLogger(__name__)
 class UnsubscribeForm(ModelForm):
     class Meta:
         model = Unsubscription
-        fields = ['email']
+        fields = ['email', 'mailout']
 
 
-# Exempt from CSRF protection so that it can be triggered by Gmail's on-click
+@csrf_exempt  # Submitted directly by Gmail and similar - no CSRF token.
-# unsubscribe.
-@csrf_exempt
 def unsubscribe(request):
+    """Endpoint for use with Gmail one-click unsubscribe or similar.
+
+    Gmail now requires "List-Unsubscribe" headers for senders over a certain
+    monthly volume (currently 5000 emails). Add the following headers to your
+    mailout:
+
+        List-Unsubscribe: <https://sfconservancy.org/contacts/unsubscribe/?email=foo@bar.com&mailout=jan2024-news>
+        List-Unsubscribe-Post: List-Unsubscribe=One-Click
+
+    Interfaces like Gmail will then provide a user interface to unsubscribe
+    which will hit this endpoint.
+    """
     if request.method == 'POST':
         logger.debug('Unsubscribe GET: %s', request.GET)
         logger.debug('Unsubscribe POST: %s', request.POST)
-        form = UnsubscribeForm(request.GET | request.POST)
+        form = UnsubscribeForm(request.GET)
         if form.is_valid():
             form.save()
             logger.info('Unsubscribed %s', form.cleaned_data['email'])