invitations: Revoke remaining invitations after user registers.

If a user receives more than one invite to join a
realm, after that user registers, all the remaining
invitations should be revoked, preventing them to be
listed in active invitations on admin panel.
To do this, we added a new prereg_user status,
STATUS_REVOKED.

We also added a confirmation_link_expired_error page
in case the user tries click on a revoked invitaion.
This page has a link to login page.

Fixes: #12629

Co-authored-by: Arunika <arunikayadav42@gmail.com>

confirmation/settings.py

@@ -3,3 +3,4 @@
 __revision__ = '$Id: settings.py 12 2008-11-23 19:38:52Z jarek.zgoda $'
 
 STATUS_ACTIVE = 1
+STATUS_REVOKED = 2

templates/zerver/confirmation_link_expired_error.html

@@ -0,0 +1,14 @@
+{% extends "zerver/portico_signup.html" %}
+
+{% block portico_content %}
+<div class="app portico-page">
+    <div class="app-main portico-page-container center-block flex full-page account-creation new-style">
+        <div class="inline-block">
+            <div class="app-main white-box">
+                <h1>{{ _("The registration link has expired or is not valid.") }}</h1>
+                <a href="{{ login_url }}">{{ _("Log in") }}</a>.
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

zerver/lib/actions.py

@@ -401,12 +401,15 @@ def process_new_human_user(user_profile: UserProfile,
     # inactive so we can keep track of the PreregistrationUser we
     # actually used for analytics
     if prereg_user is not None:
-        PreregistrationUser.objects.filter(email__iexact=user_profile.delivery_email).exclude(
-            id=prereg_user.id).update(status=0)
+        PreregistrationUser.objects.filter(
+            email__iexact=user_profile.delivery_email).exclude(id=prereg_user.id)\
+            .update(status=confirmation_settings.STATUS_REVOKED)
+
         if prereg_user.referred_by is not None:
             notify_invites_changed(user_profile)
     else:
-        PreregistrationUser.objects.filter(email__iexact=user_profile.delivery_email).update(status=0)
+        PreregistrationUser.objects.filter(email__iexact=user_profile.delivery_email)\
+            .update(status=confirmation_settings.STATUS_REVOKED)
 
     notify_new_user(user_profile)
     # Clear any scheduled invitation emails to prevent them
@@ -5072,9 +5075,10 @@ def do_invite_users(user_profile: UserProfile,
 
 def do_get_user_invites(user_profile: UserProfile) -> List[Dict[str, Any]]:
     days_to_activate = settings.INVITATION_LINK_VALIDITY_DAYS
-    active_value = getattr(confirmation_settings, 'STATUS_ACTIVE', 1)
+    active_value = confirmation_settings.STATUS_ACTIVE
+    revoked_value = confirmation_settings.STATUS_REVOKED
     lowest_datetime = timezone_now() - datetime.timedelta(days=days_to_activate)
-    base_query = PreregistrationUser.objects.exclude(status=active_value).filter(
+    base_query = PreregistrationUser.objects.exclude(status__in=[active_value, revoked_value]).filter(
         invited_at__gte=lowest_datetime)
 
     if user_profile.is_realm_admin:

zerver/tests/test_signup.py

@@ -8,6 +8,7 @@ from django.http import HttpResponse
 from django.test import TestCase, override_settings
 from django.utils.timezone import now as timezone_now
 from django.core.exceptions import ValidationError
+from django.urls import reverse
 
 from unittest.mock import patch, MagicMock
 from zerver.lib.test_helpers import (
@@ -41,7 +42,8 @@ from zerver.lib.actions import (
     do_create_default_stream_group,
     do_add_default_stream,
     do_create_realm,
-    get_default_streams_for_realm)
+    get_default_streams_for_realm,
+    do_invite_users, do_create_user)
 from zerver.lib.send_email import send_future_email, FromAddress, \
     deliver_email
 from zerver.lib.initial_password import initial_password
@@ -1506,6 +1508,40 @@ so we didn't send them an invitation. We did send invitations to everyone else!"
         self.assert_in_success_response(["Whoops. The confirmation link has expired "
                                          "or been deactivated."], result)
 
+    def test_send_more_than_one_invite_to_same_user(self) -> None:
+        self.user_profile = self.example_user('iago')
+        streams = []
+        for stream_name in ["Denmark", "Scotland"]:
+            streams.append(get_stream(stream_name, self.user_profile.realm))
+
+        do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False)
+        prereg_user = PreregistrationUser.objects.get(email="foo@zulip.com")
+        do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False)
+        do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False)
+
+        invites = PreregistrationUser.objects.filter(email__iexact="foo@zulip.com")
+        self.assertEqual(len(invites), 3)
+
+        do_create_user(
+            'foo@zulip.com',
+            'password',
+            self.user_profile.realm,
+            'full name', 'short name',
+            prereg_user=prereg_user,
+        )
+
+        accepted_invite = PreregistrationUser.objects.filter(
+            email__iexact="foo@zulip.com", status=confirmation_settings.STATUS_ACTIVE)
+        revoked_invites = PreregistrationUser.objects.filter(
+            email__iexact="foo@zulip.com", status=confirmation_settings.STATUS_REVOKED)
+        # If a user was invited more than once, when it accepts one invite and register
+        # the others must be canceled.
+        self.assertEqual(len(accepted_invite), 1)
+        self.assertEqual(accepted_invite[0].id, prereg_user.id)
+
+        expected_revoked_invites = set(invites.exclude(id=prereg_user.id))
+        self.assertEqual(set(revoked_invites), expected_revoked_invites)
+
     def test_validate_email_not_already_in_realm(self) -> None:
         email = self.nonreg_email('alice')
         password = 'password'
@@ -2763,11 +2799,9 @@ class UserSignUpTest(InviteUserBase):
              'terms': True,
              'full_name': "New Guy",
              'from_confirmation': '1'})
-        # We should get redirected back to the login page.
-        expected_url = ('/accounts/login/' + '?email=' +
-                        urllib.parse.quote_plus(email))
-        self.assertEqual(result.status_code, 302)
-        self.assertEqual(result["Location"], expected_url)
+        # Error page should be displayed
+        self.assert_in_success_response(["The registration link has expired or is not valid."], result)
+        self.assertEqual(result.status_code, 200)
 
     def test_signup_with_multiple_default_stream_groups(self) -> None:
         # Check if user is subscribed to the streams of default

zerver/views/registration.py

@@ -43,18 +43,24 @@ from confirmation.models import Confirmation, RealmCreationKey, ConfirmationKeyE
     validate_key, create_confirmation_link, get_object_from_key, \
     render_confirmation_key_error
 
+from confirmation import settings as confirmation_settings
+
 import logging
 import smtplib
 
 import urllib
 
 def check_prereg_key_and_redirect(request: HttpRequest, confirmation_key: str) -> HttpResponse:
-    # If the key isn't valid, show the error message on the original URL
     confirmation = Confirmation.objects.filter(confirmation_key=confirmation_key).first()
     if confirmation is None or confirmation.type not in [
             Confirmation.USER_REGISTRATION, Confirmation.INVITATION, Confirmation.REALM_CREATION]:
         return render_confirmation_key_error(
             request, ConfirmationKeyException(ConfirmationKeyException.DOES_NOT_EXIST))
+
+    prereg_user = confirmation.content_object
+    if prereg_user.status == confirmation_settings.STATUS_REVOKED:
+        return render(request, "zerver/confirmation_link_expired_error.html")
+
     try:
         get_object_from_key(confirmation_key, confirmation.type, activate_object=False)
     except ConfirmationKeyException as exception:
@@ -73,6 +79,8 @@ def accounts_register(request: HttpRequest) -> HttpResponse:
     key = request.POST['key']
     confirmation = Confirmation.objects.get(confirmation_key=key)
     prereg_user = confirmation.content_object
+    if prereg_user.status == confirmation_settings.STATUS_REVOKED:
+        return render(request, "zerver/confirmation_link_expired_error.html")
     email = prereg_user.email
     realm_creation = prereg_user.realm_creation
     password_required = prereg_user.password_required