From 9359dc5be05bd2d7587fa5df4d3e755d61f5a8ff Mon Sep 17 00:00:00 2001
From: Pierre HUBERT <pierre.git@communiquons.org>
Date: Mon, 1 Dec 2025 10:42:19 +0100
Subject: [PATCH] Send read receipts

---
 .../matrix/matrix_event_controller.rs         | 22 ++++++++++++++++
 matrixgw_backend/src/main.rs                  |  4 +++
 .../src/api/matrix/MatrixApiEvent.ts          | 10 ++++++++
 .../src/widgets/messages/RoomWidget.tsx       | 25 ++++++++++++++++++-
 4 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs b/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs
index efbe9e0..94e4eb1 100644
--- a/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs
+++ b/matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs
@@ -11,7 +11,9 @@ use matrix_sdk::deserialized_responses::{TimelineEvent, TimelineEventKind};
 use matrix_sdk::media::MediaEventContent;
 use matrix_sdk::room::MessagesOptions;
 use matrix_sdk::room::edit::EditedContent;
+use matrix_sdk::ruma::api::client::receipt::create_receipt::v3::ReceiptType;
 use matrix_sdk::ruma::events::reaction::ReactionEventContent;
+use matrix_sdk::ruma::events::receipt::ReceiptThread;
 use matrix_sdk::ruma::events::relation::Annotation;
 use matrix_sdk::ruma::events::room::message::{
     MessageType, RoomMessageEvent, RoomMessageEventContent, RoomMessageEventContentWithoutRelation,
@@ -266,3 +268,23 @@ pub async fn redact_event(
         }
     })
 }
+
+/// Send receipt for event
+pub async fn receipt(
+    client: MatrixClientExtractor,
+    path: web::Path<RoomIdInPath>,
+    event_path: web::Path<EventIdInPath>,
+) -> HttpResult {
+    let Some(room) = client.client.client.get_room(&path.room_id) else {
+        return Ok(HttpResponse::NotFound().json("Room not found"));
+    };
+
+    room.send_single_receipt(
+        ReceiptType::Read,
+        ReceiptThread::default(),
+        event_path.event_id.clone(),
+    )
+    .await?;
+
+    Ok(HttpResponse::Accepted().finish())
+}
diff --git a/matrixgw_backend/src/main.rs b/matrixgw_backend/src/main.rs
index 7623f65..1713864 100644
--- a/matrixgw_backend/src/main.rs
+++ b/matrixgw_backend/src/main.rs
@@ -188,6 +188,10 @@ async fn main() -> std::io::Result<()> {
             .route(
                 "/api/matrix/room/{room_id}/event/{event_id}",
                 web::delete().to(matrix_event_controller::redact_event),
+            )
+             .route(
+                "/api/matrix/room/{room_id}/event/{event_id}/receipt",
+                web::post().to(matrix_event_controller::receipt),
             )
             // Matrix media controller
             .route(
diff --git a/matrixgw_frontend/src/api/matrix/MatrixApiEvent.ts b/matrixgw_frontend/src/api/matrix/MatrixApiEvent.ts
index f3d81f9..497dc0d 100644
--- a/matrixgw_frontend/src/api/matrix/MatrixApiEvent.ts
+++ b/matrixgw_frontend/src/api/matrix/MatrixApiEvent.ts
@@ -140,4 +140,14 @@ export class MatrixApiEvent {
       uri: `/matrix/room/${room.id}/event/${event_id}`,
     });
   }
+
+  /**
+   * Send event receipt
+   */
+  static async SendReceipt(room: Room, event_id: string): Promise<void> {
+    await APIClient.exec({
+      method: "POST",
+      uri: `/matrix/room/${room.id}/event/${event_id}/receipt`,
+    });
+  }
 }
diff --git a/matrixgw_frontend/src/widgets/messages/RoomWidget.tsx b/matrixgw_frontend/src/widgets/messages/RoomWidget.tsx
index 77d52f1..61d33be 100644
--- a/matrixgw_frontend/src/widgets/messages/RoomWidget.tsx
+++ b/matrixgw_frontend/src/widgets/messages/RoomWidget.tsx
@@ -4,14 +4,37 @@ import type { Room } from "../../api/matrix/MatrixApiRoom";
 import { RoomEventsManager } from "../../utils/RoomEventsManager";
 import { RoomMessagesList } from "./RoomMessagesList";
 import { SendMessageForm } from "./SendMessageForm";
+import { MatrixApiEvent } from "../../api/matrix/MatrixApiEvent";
+import { useSnackbar } from "../../hooks/contexts_provider/SnackbarProvider";
 
 export function RoomWidget(p: {
   room: Room;
   users: UsersMap;
   manager: RoomEventsManager;
 }): React.ReactElement {
+  const snackbar = useSnackbar();
+
+  const receiptId = React.useRef<string | undefined>(undefined);
+
+  const handleRoomClick = async () => {
+    if (p.manager.messages.length === 0) return;
+    const latest = p.manager.messages[p.manager.messages.length - 1];
+    if (latest.event_id === receiptId.current) return;
+
+    receiptId.current = latest.event_id;
+    try {
+      await MatrixApiEvent.SendReceipt(p.room, latest.event_id);
+    } catch (e) {
+      console.error("Failed to send read receipt!", e);
+      snackbar(`Failed to send read receipt! ${e}`);
+    }
+  };
+
   return (
-    <div style={{ display: "flex", flexDirection: "column", flex: 1 }}>
+    <div
+      style={{ display: "flex", flexDirection: "column", flex: 1 }}
+      onClick={handleRoomClick}
+    >
       <RoomMessagesList {...p} />
       <SendMessageForm {...p} />
     </div>