diff --git a/synapse/rest/synapse/client/pick_idp.py b/synapse/rest/synapse/client/pick_idp.py
new file mode 100644
index 0000000000..e5b720bbca
--- /dev/null
+++ b/synapse/rest/synapse/client/pick_idp.py
@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+from typing import TYPE_CHECKING
+
+from synapse.http.server import (
+ DirectServeHtmlResource,
+ finish_request,
+ respond_with_html,
+)
+from synapse.http.servlet import parse_string
+from synapse.http.site import SynapseRequest
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class PickIdpResource(DirectServeHtmlResource):
+ """IdP picker resource.
+
+ This resource gets mounted under /_synapse/client/pick_idp. It serves an HTML page
+ which prompts the user to choose an Identity Provider from the list.
+ """
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+ self._sso_handler = hs.get_sso_handler()
+ self._sso_login_idp_picker_template = (
+ hs.config.sso.sso_login_idp_picker_template
+ )
+ self._server_name = hs.hostname
+
+ async def _async_render_GET(self, request: SynapseRequest) -> None:
+ client_redirect_url = parse_string(request, "redirectUrl", required=True)
+ idp = parse_string(request, "idp", required=False)
+
+ # if we need to pick an IdP, do so
+ if not idp:
+ return await self._serve_id_picker(request, client_redirect_url)
+
+ # otherwise, redirect to the IdP's redirect URI
+ providers = self._sso_handler.get_identity_providers()
+ auth_provider = providers.get(idp)
+ if not auth_provider:
+ logger.info("Unknown idp %r", idp)
+ self._sso_handler.render_error(
+ request, "unknown_idp", "Unknown identity provider ID"
+ )
+ return
+
+ sso_url = await auth_provider.handle_redirect_request(
+ request, client_redirect_url.encode("utf8")
+ )
+ logger.info("Redirecting to %s", sso_url)
+ request.redirect(sso_url)
+ finish_request(request)
+
+ async def _serve_id_picker(
+ self, request: SynapseRequest, client_redirect_url: str
+ ) -> None:
+ # otherwise, serve up the IdP picker
+ providers = self._sso_handler.get_identity_providers()
+ html = self._sso_login_idp_picker_template.render(
+ redirect_url=client_redirect_url,
+ server_name=self._server_name,
+ providers=providers.values(),
+ )
+ respond_with_html(request, 200, html)
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