support: Consolidate logic for generating support URLs.

The build_support_url is a more generic function that's used in
the BillingSession framework and will generate the same URL for
these Zulip Cloud support requests.

corporate/lib/support.py

@@ -1,11 +1,8 @@
 from dataclasses import dataclass
 from datetime import datetime, timedelta
 from typing import Optional, TypedDict, Union
-from urllib.parse import urlencode, urljoin, urlunsplit
 
-from django.conf import settings
 from django.db.models import Sum
-from django.urls import reverse
 from django.utils.timezone import now as timezone_now
 
 from corporate.lib.stripe import (
@@ -30,7 +27,7 @@ from corporate.models import (
 )
 from zerver.models import Realm
 from zerver.models.realm_audit_logs import AuditLogEventType
-from zerver.models.realms import get_org_type_display_name, get_realm
+from zerver.models.realms import get_org_type_display_name
 from zilencer.lib.remote_counts import MissingDataError
 from zilencer.models import (
     RemoteCustomerUserCount,
@@ -130,15 +127,6 @@ def get_stripe_customer_url(stripe_id: str) -> str:
     return f"https://dashboard.stripe.com/customers/{stripe_id}"  # nocoverage
 
 
-def get_realm_support_url(realm: Realm) -> str:
-    support_realm_url = get_realm(settings.STAFF_SUBDOMAIN).url
-    support_url = urljoin(
-        support_realm_url,
-        urlunsplit(("", "", reverse("support"), urlencode({"q": realm.string_id}), "")),
-    )
-    return support_url
-
-
 def get_realm_user_data(realm: Realm) -> UserData:
     non_guests = get_non_guest_user_count(realm)
     guests = get_guest_user_count(realm)

corporate/views/support.py

@@ -98,7 +98,7 @@ class DemoRequestForm(forms.Form):
 @zulip_login_required
 @typed_endpoint_without_parameters
 def support_request(request: HttpRequest) -> HttpResponse:
-    from corporate.lib.support import get_realm_support_url
+    from corporate.lib.stripe import build_support_url
 
     user = request.user
     assert user.is_authenticated
@@ -119,7 +119,7 @@ def support_request(request: HttpRequest) -> HttpResponse:
                 "realm_string_id": user.realm.string_id,
                 "request_subject": form.cleaned_data["request_subject"],
                 "request_message": form.cleaned_data["request_message"],
-                "support_url": get_realm_support_url(user.realm),
+                "support_url": build_support_url("support", user.realm.string_id),
                 "user_role": user.get_role_name(),
             }
             # Sent to the server's support team, so this email is not user-facing.