feat(policy-server): Add configurable timeout

conduwuit-example.toml

@@ -340,6 +340,22 @@
 #
 #federation_timeout = 300
 
+# MSC4284 Policy server request timeout (seconds). Generally policy
+# servers should respond near instantly, however may slow down under
+# load. If a policy server doesn't respond in a short amount of time, the
+# room it is configured in may become unusable if this limit is set too
+# high. 10 seconds is a good default, however dropping this to 3-5 seconds
+# can be acceptable.
+#
+# Please be aware that policy requests are *NOT* currently re-tried, so if
+# a spam check request fails, the event will be assumed to be not spam,
+# which in some cases may result in spam being sent to or received from
+# the room that would typically be prevented.
+#
+# About policy servers: https://matrix.org/blog/2025/04/introducing-policy-servers/
+#
+#policy_server_request_timeout = 10
+
 # Federation client idle connection pool timeout (seconds).
 #
 #federation_idle_timeout = 25

src/core/config/mod.rs

@@ -431,6 +431,23 @@ pub struct Config {
 	#[serde(default = "default_federation_timeout")]
 	pub federation_timeout: u64,
 
+	/// MSC4284 Policy server request timeout (seconds). Generally policy
+	/// servers should respond near instantly, however may slow down under
+	/// load. If a policy server doesn't respond in a short amount of time, the
+	/// room it is configured in may become unusable if this limit is set too
+	/// high. 10 seconds is a good default, however dropping this to 3-5 seconds
+	/// can be acceptable.
+	///
+	/// Please be aware that policy requests are *NOT* currently re-tried, so if
+	/// a spam check request fails, the event will be assumed to be not spam,
+	/// which in some cases may result in spam being sent to or received from
+	/// the room that would typically be prevented.
+	///
+	/// About policy servers: https://matrix.org/blog/2025/04/introducing-policy-servers/
+	/// default: 10
+	#[serde(default = "default_policy_server_request_timeout")]
+	pub policy_server_request_timeout: u64,
+
 	/// Federation client idle connection pool timeout (seconds).
 	///
 	/// default: 25
@@ -2208,6 +2225,8 @@ fn default_federation_conn_timeout() -> u64 { 10 }
 
 fn default_federation_timeout() -> u64 { 25 }
 
+fn default_policy_server_request_timeout() -> u64 { 25 }
+
 fn default_federation_idle_timeout() -> u64 { 25 }
 
 fn default_federation_idle_per_host() -> u16 { 1 }

src/service/rooms/event_handler/policy_server.rs

@@ -65,7 +65,7 @@ pub async fn ask_policy_server(&self, pdu: &PduEvent, room_id: &RoomId) -> Resul
 		"Checking event for spam with policy server"
 	);
 	let response = tokio::time::timeout(
-		Duration::from_secs(10),
+		Duration::from_secs(self.services.server.config.policy_server_request_timeout),
 		self.services
 			.sending
 			.send_federation_request(via, PolicyRequest {