added functions to remove messages

Riot/Categories/MXRoomSummary.swift

@@ -0,0 +1,57 @@
+//
+// Copyright 2024 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+extension Notification.Name {
+    static let roomSummaryDidRemoveExpiredDataFromStore = Notification.Name(MXRoomSummary.roomSummaryDidRemoveExpiredDataFromStore)
+}
+
+@objc extension MXRoomSummary {
+    static let roomSummaryDidRemoveExpiredDataFromStore = "roomSummaryDidRemoveExpiredDataFromStore"
+    
+    private enum Constants {
+        static let roomRetentionInDaysKey = "roomRetentionInDays"
+    }
+    /// Get the room messages retention period in days
+    func roomRetentionPeriodInDays() -> uint {
+        if let period = self.others[Constants.roomRetentionInDaysKey] as? uint {
+            return period
+        } else {
+            return 365
+        }
+    }
+    
+    /// Get the timestamp below which the received messages must be removed from the store, and the display
+    func mininumTimestamp() -> UInt64 {
+        let periodInMs = Tools.durationInMs(fromDays: self.roomRetentionPeriodInDays())
+        let currentTs = (UInt64)(Date().timeIntervalSince1970 * 1000)
+        return (currentTs - periodInMs)
+    }
+    
+    /// Remove the expired messages from the store.
+    /// If some data are removed, this operation posts the notification: roomSummaryDidRemoveExpiredDataFromStore.
+    /// This operation does not commit the potential change. We let the caller trigger the commit when this is the more suitable.
+    ///
+    /// Provide a boolean telling whether some data have been removed.
+    func removeExpiredRoomContentsFromStore() -> Bool {
+        let ret = self.mxSession.store.removeAllMessagesSent(before: self.mininumTimestamp(), inRoom: roomId)
+        if ret {
+            NotificationCenter.default.post(name: .roomSummaryDidRemoveExpiredDataFromStore, object: self)
+        }
+        return ret
+    }
+}

Riot/Categories/MXSession.swift

@@ -26,3 +26,18 @@ extension MXSession {
                            displayName: user?.displayname)
     }
 }
+
+@objc extension MXSession {
+
+    /// Clean the storage of a session by removing the expired contents.
+    func removeExpiredMessages() {
+        var hasStoreChanged = false
+        for room in self.rooms {
+            hasStoreChanged = hasStoreChanged || room.summary.removeExpiredRoomContentsFromStore()
+        }
+
+        if hasStoreChanged {
+            self.store.commit?()
+        }
+    }
+}

Riot/Utils/Tools.h

@@ -48,4 +48,17 @@
  */
 + (NSURL*)fixURLWithSeveralHashKeys:(NSURL*)url;
 
+#pragma mark - Time utilities
+
+/**
+ * Convert a number of days to a duration in ms.
+ */
++ (uint64_t)durationInMsFromDays:(uint)days;
+
+/**
+ * Convert a duration in ms to a number of days.
+ */
++ (uint)numberOfDaysFromDurationInMs:(uint64_t)duration;
+
+
 @end

Riot/Utils/Tools.m

@@ -117,4 +117,16 @@
     return fixedURL;
 }
 
+#pragma mark - Time utilities
+
++ (uint64_t)durationInMsFromDays:(uint)days
+{
+    return days * (uint64_t)(86400000);
+}
+
++ (uint)numberOfDaysFromDurationInMs:(uint64_t)duration
+{
+    return (uint)(duration / 86400000);
+}
+
 @end