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-rw-r--r--synapse/rest/admin/users.py36
1 files changed, 36 insertions, 0 deletions
diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index 86198bab30..68c3c64a0d 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -890,3 +890,39 @@ class UserTokenRestServlet(RestServlet):
         )
 
         return 200, {"access_token": token}
+
+
+class ShadowBanRestServlet(RestServlet):
+    """An admin API for shadow-banning a user.
+
+    A shadow-banned users receives successful responses to their client-server
+    API requests, but the events are not propagated into rooms.
+
+    Shadow-banning a user should be used as a tool of last resort and may lead
+    to confusing or broken behaviour for the client.
+
+    Example:
+
+        POST /_synapse/admin/v1/users/@test:example.com/shadow_ban
+        {}
+
+        200 OK
+        {}
+    """
+
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]*)/shadow_ban")
+
+    def __init__(self, hs: "HomeServer"):
+        self.hs = hs
+        self.store = hs.get_datastore()
+        self.auth = hs.get_auth()
+
+    async def on_POST(self, request, user_id):
+        await assert_requester_is_admin(self.auth, request)
+
+        if not self.hs.is_mine_id(user_id):
+            raise SynapseError(400, "Only local users can be shadow-banned")
+
+        await self.store.set_shadow_banned(UserID.from_string(user_id), True)
+
+        return 200, {}