add simple view

app/signup/templates/signup/index.html

@@ -77,12 +77,18 @@
   <form class="pure-form pure-form-aligned" action="{% url "index" %}" method="post">
     <fieldset>
       {% csrf_token %}
-      {% comment %}
-        <span class="pure-form-message message-error">{{ .Err }}</span>
+
+      {% if error_message %}
+        <span class="pure-form-message message-error">{{ error_message }}</span>
+      {% elif request.GET.success %}
         <span class="pure-form-message message-success">
-          You are now subscribed!
+          {% if request.GET.already_subscribed %}
+            Looks like you were already subscribed. We share your excitement!
+          {% else %}
+            You are now subscribed!
+          {% endif %}
         </span>
-      {% endcomment %}
+      {% endif %}
 
       <input type="email" class="subscribe-email" name="email" id="email" placeholder="your@email.com" required />
 

app/signup/tests.py

@@ -1,3 +1,21 @@
-from django.test import TestCase
+from django.test import TestCase, Client
+
+from django.urls import reverse
+
+def SignupViewTests(TestCase):
+    def setUp(self):
+        self.client = Client()
+
+    def test_index(self):
+        resp = self.client.get(reverse("index"))
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(resp, "11sync is a privacy-respecting way")
+
+    def test_ok_signup(self):
+        resp = self.client.post(reverse("index"), {"email": "foo@example.com"},
+                                follow = True,
+                                HTTP_USER_AGENT = "foo-agent",
+                                REMOTE_ADDR = "127.0.0.2")
+        self.assertEqual(resp.redirect_chain, ('http://testserver/?success', 302))
+        self.assertContains(resp, "You are now subscribed!")
 
-# Create your tests here.

app/signup/views.py

@@ -1,4 +1,48 @@
-from django.shortcuts import render
+import logging
+
+from django.shortcuts import render, redirect
+from django.db import IntegrityError
+
+from lib.anonymize_ip import anonymize_ip
+
+from .models import Signup
+
+
+logger = logging.getLogger(__name__)
+
 
 def index(request):
+    if request.method == "POST":
+        x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR')
+        if x_forwarded_for:
+            ip = x_forwarded_for.split(',')[0]
+        else:
+            ip = request.META.get('REMOTE_ADDR')
+        anonymous_ip = anonymize_ip(ip)
+
+        e = Email(
+          email = request.POST.get("email"),
+          anonymized_ip = anonymous_ip,
+          user_agent = request.META["HTTP_USER_AGENT"],
+        )
+
+        try:
+            e.clean_fields()
+        except ValidationError as e:
+            return e.render(request, "signup/index.html",
+                            {"error_message": e.message})
+
+        logging.info("registering email={}".format(request.POST.get("email")))
+        try:
+            e.save()
+        except IntegrityError:
+            # email already registered, presumably
+            return redirect("index") + "?already_subscribed"
+        except DatabaseError:
+            logger.exception("database error when registering an email")
+            err =  "Sorry, database error. Please come back later."
+            return render(request, "signup/index.html",
+                          {"error_message": err})
+        return redirect("index") + "?success"
+
     return render(request, "signup/index.html", {})