signup: add referrer

app/signup/migrations/0002_signup_referrer.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.2 on 2024-02-27 16:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('signup', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='signup',
+            name='referrer',
+            field=models.CharField(blank=True, max_length=255),
+        ),
+    ]

app/signup/models.py

@@ -7,6 +7,7 @@ class Signup(models.Model):
     anonymized_ip = models.GenericIPAddressField()
     user_agent = models.CharField(max_length=255)
     geoip = models.JSONField(null=True, blank=True)
+    referrer = models.CharField(max_length=255, blank=True)
 
     class Meta:
         constraints = [

app/signup/tests.py

@@ -17,10 +17,12 @@ class SignupViewTest(TestCase):
         resp = self.client.post(reverse("index"), {"email": "foo@example.com"},
                                 follow=True,
                                 HTTP_USER_AGENT="foo-agent",
-                                REMOTE_ADDR="127.0.0.2")
+                                REMOTE_ADDR="127.0.0.2",
+                                HTTP_REFERRER="example.org/good-place")
         self.assertEqual(resp.redirect_chain, [('/?success=subscribed', 302)])
         self.assertContains(resp, "You are now subscribed!")
         obj = Signup.objects.get()
         self.assertEqual(obj.email, "foo@example.com")
         self.assertEqual(obj.anonymized_ip, "127.0.0.0")
         self.assertEqual(obj.user_agent, "foo-agent")
+        self.assertEqual(obj.referrer, "example.org/good-place")

app/signup/views.py

@@ -33,8 +33,9 @@ def index(request):
         s = Signup(
             email=request.POST.get("email"),
             anonymized_ip=anonymous_ip,
-            user_agent=request.META["HTTP_USER_AGENT"],
+            user_agent=request.META['HTTP_USER_AGENT'],
             geoip=geoip,
+            referrer=request.META.get('HTTP_REFERRER', ''),
         )
 
         try: