contacts: Update unsubscribe to work through browser GET interface

Also add field to mark unsubscribes as actioned.

conservancy/contacts/admin.py

@@ -6,4 +6,5 @@ from .models import Unsubscription
 @admin.register(Unsubscription)
 class UnsubscriptionAdmin(admin.ModelAdmin):
     list_display = ['created', 'email', 'mailout']
+    list_filter = ['mailout', 'actioned']
     search_fields = ['email', 'mailout']

conservancy/contacts/migrations/0003_unsubscription_actioned.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.2 on 2024-12-10 18:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contacts', '0002_unsubscription_mailout'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='unsubscription',
+            name='actioned',
+            field=models.DateField(blank=True, null=True),
+        ),
+    ]

conservancy/contacts/models.py

@@ -5,6 +5,13 @@ class Unsubscription(models.Model):
     created = models.DateTimeField(auto_now_add=True, blank=True)
     email = models.EmailField()
     mailout = models.SlugField()
+    actioned = models.DateField(null=True, blank=True)
 
     class Meta:
         ordering = ['created']
+
+    def __str__(self):
+        if self.mailout:
+            return f'{self.email} ({self.mailout})'
+        else:
+            return self.email

conservancy/contacts/views.py

@@ -27,15 +27,27 @@ def unsubscribe(request):
 
     Interfaces like Gmail will then provide a user interface to unsubscribe
     which will hit this endpoint.
+
+    Our understanding is that Gmail will submit the form with and HTTP POST request, but
+    with GET-style URL parameters. Hence this feature has been built to work both with
+    GET and POST-style data as well as GET and POST methods, just in case. Test it like
+    this:
+
+    curl -X POST -d 'email=foo@bar.com&mailout=jan2024-new' https://sfconservancy.org/contacts/unsubscribe/
+    curl -X POST 'https://sfconservancy.org/contacts/unsubscribe/?email=foo@bar.com&mailout=jan2024-new'
+
+    Or visit in a browser:
+
+    https://sfconservancy.org/contacts/unsubscribe/?email=foo@bar.com&mailout=jan2024-new
     """
     if request.method == 'POST':
         logger.debug('Unsubscribe GET: %s', request.GET)
         logger.debug('Unsubscribe POST: %s', request.POST)
-        form = UnsubscribeForm(request.GET)
+        form = UnsubscribeForm(request.GET.dict() | request.POST.dict())
         if form.is_valid():
             form.save()
             logger.info('Unsubscribed %s', form.cleaned_data['email'])
             return render(request, 'contacts/unsubscribe_success.html')
     else:
-        form = UnsubscribeForm()
+        form = UnsubscribeForm(request.GET.dict() | request.POST.dict())
     return render(request, 'contacts/unsubscribe.html', {'form': form})