corporate: Show error page if mobile push data has not been uploaded.

Adds a template that displays an error message when the billing
or upgrade context for a remote server or remote realm raises a
MissingDataError.

corporate/lib/stripe.py

@@ -17,6 +17,8 @@ from django.conf import settings
 from django.core import signing
 from django.core.signing import Signer
 from django.db import transaction
+from django.http import HttpRequest, HttpResponse
+from django.shortcuts import render
 from django.urls import reverse
 from django.utils.timezone import now as timezone_now
 from django.utils.translation import gettext as _
@@ -3029,6 +3031,19 @@ class RemoteRealmBillingSession(BillingSession):  # nocoverage
         )
         return remote_realm_counts.non_guest_user_count + remote_realm_counts.guest_user_count
 
+    def missing_data_error_page(self, request: HttpRequest) -> HttpResponse:
+        # The RemoteRealm error page code path should not really be
+        # possible, in that the self-hosted server will have uploaded
+        # current audit log data as needed as part of logging the user
+        # in.
+        missing_data_context: Dict[str, Any] = {
+            "remote_realm_session": True,
+            "supports_remote_realms": self.remote_realm.server.last_api_feature_level is not None,
+        }
+        return render(
+            request, "corporate/server_not_uploading_data.html", context=missing_data_context
+        )
+
     @override
     def get_audit_log_event(self, event_type: AuditLogEventType) -> int:
         if event_type is AuditLogEventType.STRIPE_CUSTOMER_CREATED:
@@ -3407,6 +3422,17 @@ class RemoteServerBillingSession(BillingSession):  # nocoverage
         )
         return remote_server_counts.non_guest_user_count + remote_server_counts.guest_user_count
 
+    def missing_data_error_page(self, request: HttpRequest) -> HttpResponse:
+        # The remedy for a RemoteZulipServer login is usually
+        # upgrading to Zulip 8.0 or enabling SUBMIT_USAGE_STATISTICS.
+        missing_data_context = {
+            "remote_realm_session": False,
+            "supports_remote_realms": self.remote_server.last_api_feature_level is not None,
+        }
+        return render(
+            request, "corporate/server_not_uploading_data.html", context=missing_data_context
+        )
+
     @override
     def get_audit_log_event(self, event_type: AuditLogEventType) -> int:
         if event_type is AuditLogEventType.STRIPE_CUSTOMER_CREATED:

corporate/views/billing_page.py

@@ -25,6 +25,7 @@ from zerver.lib.response import json_success
 from zerver.lib.typed_endpoint import typed_endpoint
 from zerver.lib.validator import check_int, check_int_in
 from zerver.models import UserProfile
+from zilencer.lib.remote_counts import MissingDataError
 from zilencer.models import RemoteRealm, RemoteZulipServer
 
 billing_logger = logging.getLogger("corporate.stripe")
@@ -130,7 +131,11 @@ def remote_realm_billing_page(
     ):
         return HttpResponseRedirect(reverse("remote_realm_plans_page", args=(realm_uuid,)))
 
+    try:
         main_context = billing_session.get_billing_page_context()
+    except MissingDataError:
+        return billing_session.missing_data_error_page(request)
+
     if main_context:
         context.update(main_context)
         context["success_message"] = success_message
@@ -190,7 +195,11 @@ def remote_server_billing_page(
             )
         )
 
+    try:
         main_context = billing_session.get_billing_page_context()
+    except MissingDataError:
+        return billing_session.missing_data_error_page(request)
+
     if main_context:
         context.update(main_context)
         context["success_message"] = success_message

corporate/views/upgrade.py

@@ -28,6 +28,7 @@ from zerver.lib.response import json_success
 from zerver.lib.typed_endpoint import typed_endpoint
 from zerver.lib.validator import check_bool, check_int, check_string_in
 from zerver.models import UserProfile
+from zilencer.lib.remote_counts import MissingDataError
 
 billing_logger = logging.getLogger("corporate.stripe")
 
@@ -220,7 +221,10 @@ def remote_realm_upgrade_page(
         tier=CustomerPlan.TIER_SELF_HOSTED_BUSINESS,
         success_message=success_message,
     )
+    try:
         redirect_url, context = billing_session.get_initial_upgrade_context(initial_upgrade_request)
+    except MissingDataError:
+        return billing_session.missing_data_error_page(request)
 
     if redirect_url:
         return HttpResponseRedirect(redirect_url)
@@ -243,7 +247,10 @@ def remote_server_upgrade_page(
         tier=CustomerPlan.TIER_SELF_HOSTED_BUSINESS,
         success_message=success_message,
     )
+    try:
         redirect_url, context = billing_session.get_initial_upgrade_context(initial_upgrade_request)
+    except MissingDataError:
+        return billing_session.missing_data_error_page(request)
 
     if redirect_url:
         return HttpResponseRedirect(redirect_url)

templates/corporate/server_not_uploading_data.html

@@ -0,0 +1,42 @@
+{% extends "zerver/portico.html" %}
+
+{% block title %}
+<title>Required metadata missing | Zulip</title>
+{% endblock %}
+
+{% block portico_content %}
+<div class="center-block flex full-page account-creation new-style">
+    <div class="inline-block">
+        <div class="get-started">
+            <h1>Error: Server not uploading basic metadata</h1>
+        </div>
+        <div class="white-box">
+            <p>
+                Managing your Zulip plan requires your server to upload
+                up-to-date
+                <a
+                  href="https://zulip.readthedocs.io/en/latest/production/mobile-push-notifications.html#uploading-basic-metadata">basic
+                metadata</a>. This data is not being uploaded successfully.
+            </p>
+            {% if remote_realm_session %}
+            <p>
+                If your Zulip server's administrator is not able to fix this, <a
+                href="mailto:support@zulip.com">contact Zulip support</a>.
+            </p>
+            {% elif supports_remote_realms %}
+            <p>
+                If your Zulip server's administrator is not able to fix this, <a
+                href="mailto:support@zulip.com">contact Zulip support</a>.
+            </p>
+            {% else %}
+            <p>
+                Your Zulip server's administrator can fix this issue by <a
+                href="https://zulip.readthedocs.io/en/stable/production/upgrade.html">upgrading</a>
+                the server to Zulip 8.0+, or enabling the
+                <code>SUBMIT_USAGE_STATISTICS</code> setting.
+            </p>
+            {% endif %}
+        </div>
+    </div>
+</div>
+{% endblock %}