diff --git a/synapse/rest/client/account_validity.py b/synapse/rest/client/account_validity.py
new file mode 100644
index 0000000000..6c24b96c54
--- /dev/null
+++ b/synapse/rest/client/account_validity.py
@@ -0,0 +1,99 @@
+# Copyright 2019 New Vector Ltd
+#
+# 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, Tuple
+
+from twisted.web.server import Request
+
+from synapse.http.server import HttpServer, respond_with_html
+from synapse.http.servlet import RestServlet, parse_string
+from synapse.http.site import SynapseRequest
+from synapse.types import JsonDict
+
+from ._base import client_patterns
+
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
+logger = logging.getLogger(__name__)
+
+
+class AccountValidityRenewServlet(RestServlet):
+ PATTERNS = client_patterns("/account_validity/renew$")
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+
+ self.hs = hs
+ self.account_activity_handler = hs.get_account_validity_handler()
+ self.auth = hs.get_auth()
+ self.account_renewed_template = (
+ hs.config.account_validity.account_validity_account_renewed_template
+ )
+ self.account_previously_renewed_template = (
+ hs.config.account_validity.account_validity_account_previously_renewed_template
+ )
+ self.invalid_token_template = (
+ hs.config.account_validity.account_validity_invalid_token_template
+ )
+
+ async def on_GET(self, request: Request) -> None:
+ renewal_token = parse_string(request, "token", required=True)
+
+ (
+ token_valid,
+ token_stale,
+ expiration_ts,
+ ) = await self.account_activity_handler.renew_account(renewal_token)
+
+ if token_valid:
+ status_code = 200
+ response = self.account_renewed_template.render(expiration_ts=expiration_ts)
+ elif token_stale:
+ status_code = 200
+ response = self.account_previously_renewed_template.render(
+ expiration_ts=expiration_ts
+ )
+ else:
+ status_code = 404
+ response = self.invalid_token_template.render(expiration_ts=expiration_ts)
+
+ respond_with_html(request, status_code, response)
+
+
+class AccountValiditySendMailServlet(RestServlet):
+ PATTERNS = client_patterns("/account_validity/send_mail$")
+
+ def __init__(self, hs: "HomeServer"):
+ super().__init__()
+
+ self.hs = hs
+ self.account_activity_handler = hs.get_account_validity_handler()
+ self.auth = hs.get_auth()
+ self.account_validity_renew_by_email_enabled = (
+ hs.config.account_validity.account_validity_renew_by_email_enabled
+ )
+
+ async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
+ requester = await self.auth.get_user_by_req(request, allow_expired=True)
+ user_id = requester.user.to_string()
+ await self.account_activity_handler.send_renewal_email_to_user(user_id)
+
+ return 200, {}
+
+
+def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
+ AccountValidityRenewServlet(hs).register(http_server)
+ AccountValiditySendMailServlet(hs).register(http_server)
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