disable URL previews by default upon admin room creation

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/service/admin.rs

@@ -14,6 +14,7 @@ use ruma::{
 			message::RoomMessageEventContent,
 			name::RoomNameEventContent,
 			power_levels::RoomPowerLevelsEventContent,
+			preview_url::RoomPreviewUrlsEventContent,
 			topic::RoomTopicEventContent,
 		},
 		TimelineEventType,
@@ -387,6 +388,27 @@ impl Service {
 
 		services().rooms.alias.set_alias(&alias, &room_id)?;
 
+		// 7. (ad-hoc) Disable room previews for everyone by default
+		services()
+			.rooms
+			.timeline
+			.build_and_append_pdu(
+				PduBuilder {
+					event_type: TimelineEventType::RoomPreviewUrls,
+					content: to_raw_value(&RoomPreviewUrlsEventContent {
+						disabled: true,
+					})
+					.expect("event is valid we just created it"),
+					unsigned: None,
+					state_key: Some(String::new()),
+					redacts: None,
+				},
+				&server_user,
+				&room_id,
+				&state_lock,
+			)
+			.await?;
+
 		Ok(())
 	}