events: Add RoomRedactionUnsigned

crates/ruma-common/src/events/room/redaction.rs

@@ -2,17 +2,19 @@
 //!
 //! [`m.room.redaction`]: https://spec.matrix.org/latest/client-server-api/#mroomredaction
 
+use js_int::Int;
 use ruma_macros::{Event, EventContent};
 use serde::{Deserialize, Deserializer, Serialize};
 use serde_json::value::RawValue as RawJsonValue;
 
 use crate::{
     events::{
-        EventContent, MessageLikeEventType, MessageLikeUnsigned, RedactedUnsigned,
+        BundledMessageLikeRelations, EventContent, MessageLikeEventType, RedactedUnsigned,
         RedactionDeHelper,
     },
-    serde::from_raw_json_value,
+    serde::{from_raw_json_value, CanBeEmpty},
-    EventId, MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedRoomId, OwnedUserId, RoomId, UserId,
+    EventId, MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedRoomId, OwnedTransactionId,
+    OwnedUserId, RoomId, UserId,
 };
 
 /// A possibly-redacted redaction event.
@@ -60,7 +62,7 @@ pub struct OriginalRoomRedactionEvent {
     pub room_id: OwnedRoomId,
 
     /// Additional key-value pairs not signed by the homeserver.
-    pub unsigned: MessageLikeUnsigned<RoomRedactionEventContent>,
+    pub unsigned: RoomRedactionUnsigned,
 }
 
 /// Redacted redaction event.
@@ -106,7 +108,7 @@ pub struct OriginalSyncRoomRedactionEvent {
     pub origin_server_ts: MilliSecondsSinceUnixEpoch,
 
     /// Additional key-value pairs not signed by the homeserver.
-    pub unsigned: MessageLikeUnsigned<RoomRedactionEventContent>,
+    pub unsigned: RoomRedactionUnsigned,
 }
 
 /// Redacted redaction event without a `room_id`.
@@ -291,3 +293,49 @@ impl<'de> Deserialize<'de> for SyncRoomRedactionEvent {
         }
     }
 }
+
+/// Extra information about a redaction that is not incorporated into the event's hash.
+#[derive(Clone, Debug, Deserialize)]
+#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
+pub struct RoomRedactionUnsigned {
+    /// The time in milliseconds that has elapsed since the event was sent.
+    ///
+    /// This field is generated by the local homeserver, and may be incorrect if the local time on
+    /// at least one of the two servers is out of sync, which can cause the age to either be
+    /// negative or greater than it actually is.
+    pub age: Option<Int>,
+
+    /// The client-supplied transaction ID, if the client being given the event is the same one
+    /// which sent it.
+    pub transaction_id: Option<OwnedTransactionId>,
+
+    /// [Bundled aggregations] of related child events.
+    ///
+    /// [Bundled aggregations]: https://spec.matrix.org/latest/client-server-api/#aggregations
+    #[serde(rename = "m.relations", default)]
+    pub relations: BundledMessageLikeRelations<OriginalSyncRoomRedactionEvent>,
+}
+
+impl RoomRedactionUnsigned {
+    /// Create a new `Unsigned` with fields set to `None`.
+    pub fn new() -> Self {
+        Self { age: None, transaction_id: None, relations: BundledMessageLikeRelations::default() }
+    }
+}
+
+impl Default for RoomRedactionUnsigned {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl CanBeEmpty for RoomRedactionUnsigned {
+    /// Whether this unsigned data is empty (all fields are `None`).
+    ///
+    /// This method is used to determine whether to skip serializing the `unsigned` field in room
+    /// events. Do not use it to determine whether an incoming `unsigned` field was present - it
+    /// could still have been present but contained none of the known fields.
+    fn is_empty(&self) -> bool {
+        self.age.is_none() && self.transaction_id.is_none() && self.relations.is_empty()
+    }
+}