Add `/api/v1/notifications/:id/dismiss` endpoint

lib/pleroma/web/mastodon_api/controllers/notification_controller.ex

@@ -66,7 +66,8 @@ def clear(%{assigns: %{user: user}} = conn, _params) do
     json(conn, %{})
   end
 
-  # POST /api/v1/notifications/dismiss
+  # POST /api/v1/notifications/:id/dismiss
+  # POST /api/v1/notifications/dismiss (deprecated)
   def dismiss(%{assigns: %{user: user}} = conn, %{"id" => id} = _params) do
     with {:ok, _notif} <- Notification.dismiss(user, id) do
       json(conn, %{})

lib/pleroma/web/router.ex

@@ -352,9 +352,11 @@ defmodule Pleroma.Web.Router do
 
     get("/notifications", NotificationController, :index)
     get("/notifications/:id", NotificationController, :show)
+    post("/notifications/:id/dismiss", NotificationController, :dismiss)
     post("/notifications/clear", NotificationController, :clear)
-    post("/notifications/dismiss", NotificationController, :dismiss)
     delete("/notifications/destroy_multiple", NotificationController, :destroy_multiple)
+    # Deprecated: was removed in Mastodon v3, use `/notifications/:id/dismiss` instead
+    post("/notifications/dismiss", NotificationController, :dismiss)
 
     get("/scheduled_statuses", ScheduledActivityController, :index)
     get("/scheduled_statuses/:id", ScheduledActivityController, :show)

test/web/mastodon_api/controllers/notification_controller_test.exs

@@ -53,7 +53,7 @@ test "getting a single notification" do
     assert response == expected_response
   end
 
-  test "dismissing a single notification" do
+  test "dismissing a single notification (deprecated endpoint)" do
     %{user: user, conn: conn} = oauth_access(["write:notifications"])
     other_user = insert(:user)
 
@@ -69,6 +69,22 @@ test "dismissing a single notification" do
     assert %{} = json_response(conn, 200)
   end
 
+  test "dismissing a single notification" do
+    %{user: user, conn: conn} = oauth_access(["write:notifications"])
+    other_user = insert(:user)
+
+    {:ok, activity} = CommonAPI.post(other_user, %{"status" => "hi @#{user.nickname}"})
+
+    {:ok, [notification]} = Notification.create_notifications(activity)
+
+    conn =
+      conn
+      |> assign(:user, user)
+      |> post("/api/v1/notifications/#{notification.id}/dismiss")
+
+    assert %{} = json_response(conn, 200)
+  end
+
   test "clearing all notifications" do
     %{user: user, conn: conn} = oauth_access(["write:notifications", "read:notifications"])
     other_user = insert(:user)