users: Remove redundant get_role_for_new_user in lib/create_user.py.

The function get_role_for_new_user was added to get role from the
invited_as value, as invited_as values were one of (1,2,3,4)
previously, but it was then changed to be the actual role value,
i.e. one of (100, 200, 400, 600), in 1f8f227444.

So, we can safely remove this function now and use invited_as value
directly and handle realm_creation case by using an if condition.

zerver/lib/create_user.py

@@ -7,15 +7,7 @@ from django.utils.timezone import now as timezone_now
 from zerver.lib.hotspots import copy_hotspots
 from zerver.lib.upload import copy_avatar
 from zerver.lib.utils import generate_api_key
-from zerver.models import (
+from zerver.models import Realm, Recipient, Stream, Subscription, UserProfile, get_fake_email_domain
-    PreregistrationUser,
-    Realm,
-    Recipient,
-    Stream,
-    Subscription,
-    UserProfile,
-    get_fake_email_domain,
-)
 
 
 def copy_user_settings(source_profile: UserProfile, target_profile: UserProfile) -> None:
@@ -57,16 +49,6 @@ def get_display_email_address(user_profile: UserProfile) -> str:
     return user_profile.delivery_email
 
 
-def get_role_for_new_user(invited_as: int, realm_creation: bool = False) -> int:
-    if realm_creation or invited_as == PreregistrationUser.INVITE_AS["REALM_OWNER"]:
-        return UserProfile.ROLE_REALM_OWNER
-    elif invited_as == PreregistrationUser.INVITE_AS["REALM_ADMIN"]:
-        return UserProfile.ROLE_REALM_ADMINISTRATOR
-    elif invited_as == PreregistrationUser.INVITE_AS["GUEST_USER"]:
-        return UserProfile.ROLE_GUEST
-    return UserProfile.ROLE_MEMBER
-
-
 # create_user_profile is based on Django's User.objects.create_user,
 # except that we don't save to the database so it can used in
 # bulk_creates

zerver/views/registration.py

@@ -45,7 +45,6 @@ from zerver.lib.actions import (
     do_set_user_display_setting,
     lookup_default_stream_groups,
 )
-from zerver.lib.create_user import get_role_for_new_user
 from zerver.lib.email_validation import email_allowed_for_realm, validate_email_not_already_in_realm
 from zerver.lib.onboarding import send_initial_realm_messages, setup_realm_internal_bots
 from zerver.lib.pysa import mark_sanitized
@@ -134,7 +133,9 @@ def accounts_register(request: HttpRequest) -> HttpResponse:
     realm_creation = prereg_user.realm_creation
     password_required = prereg_user.password_required
 
-    role = get_role_for_new_user(prereg_user.invited_as, realm_creation)
+    role = prereg_user.invited_as
+    if realm_creation:
+        role = UserProfile.ROLE_REALM_OWNER
 
     try:
         validators.validate_email(email)

zproject/backends.py

@@ -64,7 +64,6 @@ from zerver.lib.actions import (
 )
 from zerver.lib.avatar import avatar_url, is_avatar_new
 from zerver.lib.avatar_hash import user_avatar_content_hash
-from zerver.lib.create_user import get_role_for_new_user
 from zerver.lib.dev_ldap_directory import init_fakeldap
 from zerver.lib.email_validation import email_allowed_for_realm, validate_email_not_already_in_realm
 from zerver.lib.mobile_auth_otp import is_valid_otp
@@ -863,7 +862,11 @@ class ZulipLDAPAuthBackend(ZulipLDAPAuthBackendBase):
             invited_as = self._prereg_user.invited_as
             realm_creation = self._prereg_user.realm_creation
             opts["prereg_user"] = self._prereg_user
-            opts["role"] = get_role_for_new_user(invited_as, realm_creation)
+
+            opts["role"] = invited_as
+            if realm_creation:
+                opts["role"] = UserProfile.ROLE_REALM_OWNER
+
             opts["realm_creation"] = realm_creation
             # TODO: Ideally, we should add a mechanism for the user
             # entering which default stream groups they've selected in