diff --git a/synapse/config/cas.py b/synapse/config/cas.py
deleted file mode 100644
index c32bf36951..0000000000
--- a/synapse/config/cas.py
+++ /dev/null
@@ -1,113 +0,0 @@
-#
-# This file is licensed under the Affero General Public License (AGPL) version 3.
-#
-# Copyright 2021 The Matrix.org Foundation C.I.C.
-# Copyright 2015, 2016 OpenMarket Ltd
-# Copyright (C) 2023 New Vector, Ltd
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# See the GNU Affero General Public License for more details:
-# <https://www.gnu.org/licenses/agpl-3.0.html>.
-#
-# Originally licensed under the Apache License, Version 2.0:
-# <http://www.apache.org/licenses/LICENSE-2.0>.
-#
-# [This file includes modifications made by New Vector Limited]
-#
-#
-
-from typing import Any, List, Optional
-
-from synapse.config.sso import SsoAttributeRequirement
-from synapse.types import JsonDict
-
-from ._base import Config, ConfigError
-from ._util import validate_config
-
-
-class CasConfig(Config):
- """Cas Configuration
-
- cas_server_url: URL of CAS server
- """
-
- section = "cas"
-
- def read_config(self, config: JsonDict, **kwargs: Any) -> None:
- cas_config = config.get("cas_config", None)
- self.cas_enabled = cas_config and cas_config.get("enabled", True)
-
- if self.cas_enabled:
- self.cas_server_url = cas_config["server_url"]
-
- # TODO Update this to a _synapse URL.
- public_baseurl = self.root.server.public_baseurl
- self.cas_service_url: Optional[str] = (
- public_baseurl + "_matrix/client/r0/login/cas/ticket"
- )
-
- self.cas_protocol_version = cas_config.get("protocol_version")
- if (
- self.cas_protocol_version is not None
- and self.cas_protocol_version not in [1, 2, 3]
- ):
- raise ConfigError(
- "Unsupported CAS protocol version %s (only versions 1, 2, 3 are supported)"
- % (self.cas_protocol_version,),
- ("cas_config", "protocol_version"),
- )
- self.cas_displayname_attribute = cas_config.get("displayname_attribute")
- required_attributes = cas_config.get("required_attributes") or {}
- self.cas_required_attributes = _parsed_required_attributes_def(
- required_attributes
- )
-
- self.cas_enable_registration = cas_config.get("enable_registration", True)
-
- self.cas_allow_numeric_ids = cas_config.get("allow_numeric_ids")
- self.cas_numeric_ids_prefix = cas_config.get("numeric_ids_prefix")
- if (
- self.cas_numeric_ids_prefix is not None
- and self.cas_numeric_ids_prefix.isalnum() is False
- ):
- raise ConfigError(
- "Only alphanumeric characters are allowed for numeric IDs prefix",
- ("cas_config", "numeric_ids_prefix"),
- )
-
- self.idp_name = cas_config.get("idp_name", "CAS")
- self.idp_icon = cas_config.get("idp_icon")
- self.idp_brand = cas_config.get("idp_brand")
-
- else:
- self.cas_server_url = None
- self.cas_service_url = None
- self.cas_protocol_version = None
- self.cas_displayname_attribute = None
- self.cas_required_attributes = []
- self.cas_enable_registration = False
- self.cas_allow_numeric_ids = False
- self.cas_numeric_ids_prefix = "u"
-
-
-# CAS uses a legacy required attributes mapping, not the one provided by
-# SsoAttributeRequirement.
-REQUIRED_ATTRIBUTES_SCHEMA = {
- "type": "object",
- "additionalProperties": {"anyOf": [{"type": "string"}, {"type": "null"}]},
-}
-
-
-def _parsed_required_attributes_def(
- required_attributes: Any,
-) -> List[SsoAttributeRequirement]:
- validate_config(
- REQUIRED_ATTRIBUTES_SCHEMA,
- required_attributes,
- config_path=("cas_config", "required_attributes"),
- )
- return [SsoAttributeRequirement(k, v) for k, v in required_attributes.items()]
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