MESSENGER-5203 add federation check for room

bwi/Federation/MXRoom+Federation.swift

@@ -0,0 +1,79 @@
+//
+/*
+ * Copyright (c) 2023 BWI GmbH
+ *
+ * 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
+import MatrixSDK
+
+@objc extension MXRoom {
+    
+    func isRoomFederated() -> Bool {
+        var isFederated: Bool = true
+        state { state in
+            // Search for federate flag. If the flag is not found, default value is true
+            if let events = state?.stateEvents(with: .roomCreate) {
+                for event in events {
+                    if let federateContentValue = event.wireContent["m.federate"] {
+                        isFederated = federateContentValue as? Bool ?? true
+                    }
+                }
+            }
+            if isFederated {
+                // Check Server ACLs
+                if let events = state?.stateEvents(with: .roomServerACL) {
+                    for event in events {
+                        if let aclContentValue = event.wireContent["m.room.server_acl"] {
+                            if let aclEvent = aclContentValue as? MXEvent {
+                                if aclEvent.wireContent["deny"] != nil {
+                                    isFederated = false
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return isFederated
+    }
+    
+    func isDMFederated() -> Bool {
+        var isFederated: Bool = true
+        state { state in
+            // Search for federate flag. If the flag is not found, default value is true
+            if let events = state?.stateEvents(with: .roomCreate) {
+                for event in events {
+                    if let federateContentValue = event.wireContent["m.federate"] {
+                        isFederated = federateContentValue as? Bool ?? true
+                    }
+                }
+            }
+            if isFederated {
+                // Check if the user is from the same homeserver
+                if let memberUserId = self.directUserId {
+                    if let myUserId = self.mxSession.myUser.userId {
+                        var memberUserIdComponents = memberUserId.components(separatedBy: ":")
+                        var myUserIdComponents = myUserId.components(separatedBy: ":")
+                        if memberUserIdComponents.count == 2 && myUserIdComponents.count == 2
+                            && memberUserIdComponents.last ==  myUserIdComponents.last {
+                            isFederated = false
+                        }
+                    }
+                }
+            }
+        }
+        return isFederated
+    }
+}