find_account: Fix the email search query.

The search should be case-insensitive.

zerver/tests/test_signup.py

@@ -4128,15 +4128,16 @@ class TestFindMyTeam(ZulipTestCase):
         self.assertIn("Find your Zulip accounts", result.content.decode('utf8'))
 
     def test_result(self) -> None:
+        # We capitalize a letter in cordelia's email to test that the search is case-insensitive.
         result = self.client_post('/accounts/find/',
-                                  dict(emails="iago@zulip.com,cordelia@zulip.com"))
+                                  dict(emails="iago@zulip.com,cordeliA@zulip.com"))
         self.assertEqual(result.status_code, 302)
-        self.assertEqual(result.url, "/accounts/find/?emails=iago%40zulip.com%2Ccordelia%40zulip.com")
+        self.assertEqual(result.url, "/accounts/find/?emails=iago%40zulip.com%2CcordeliA%40zulip.com")
         result = self.client_get(result.url)
         content = result.content.decode('utf8')
         self.assertIn("Emails sent! You will only receive emails", content)
-        self.assertIn(self.example_email("iago"), content)
-        self.assertIn(self.example_email("cordelia"), content)
+        self.assertIn("iago@zulip.com", content)
+        self.assertIn("cordeliA@zulip.com", content)
         from django.core.mail import outbox
 
         # 3 = 1 + 2 -- Cordelia gets an email each for the "zulip" and "lear" realms.

zerver/views/registration.py

@@ -7,6 +7,7 @@ from django.conf import settings
 from django.contrib.auth import authenticate, get_backends
 from django.core import validators
 from django.core.exceptions import ValidationError
+from django.db.models import Q
 from django.http import HttpRequest, HttpResponse, HttpResponseRedirect
 from django.shortcuts import redirect, render
 from django.urls import reverse
@@ -601,8 +602,15 @@ def find_account(request: HttpRequest) -> HttpResponse:
         form = FindMyTeamForm(request.POST)
         if form.is_valid():
             emails = form.cleaned_data['emails']
+
+            # Django doesn't support __iexact__in lookup with EmailField, so we have
+            # to use Qs to get around that without needing to do multiple queries.
+            emails_q = Q()
+            for email in emails:
+                emails_q |= Q(delivery_email__iexact=email)
+
             for user in UserProfile.objects.filter(
-                    delivery_email__in=emails, is_active=True, is_bot=False,
+                    emails_q, is_active=True, is_bot=False,
                     realm__deactivated=False):
                 context = common_context(user)
                 context.update({