RoomDataSource: Handle room members trust level for an encrypted room.

Riot/Modules/Room/DataSources/RoomDataSource.h

@@ -19,6 +19,18 @@
 
 #import "WidgetManager.h"
 
+/**
+ RoomEncryptionTrustLevel represents the room members trust level in an encrypted room.
+ */
+typedef NS_ENUM(NSUInteger, RoomEncryptionTrustLevel) {
+    RoomEncryptionTrustLevelTrusted,
+    RoomEncryptionTrustLevelWarning,
+    RoomEncryptionTrustLevelNormal,
+    RoomEncryptionTrustLevelUnknown
+};
+
+@protocol RoomDataSourceDelegate;
+
 /**
  The data source for `RoomViewController` in Vector.
  */
@@ -39,6 +51,11 @@
  */
 @property(nonatomic) BOOL showBubbleDateTimeOnSelection;
 
+/**
+ Current room members trust level for an encrypted room.
+ */
+@property(nonatomic, readonly) RoomEncryptionTrustLevel encryptionTrustLevel;
+
 /**
  Check if there is an active jitsi widget in the room and return it.
 
@@ -85,3 +102,9 @@
                                      failure:(void(^)(NSError*))failure;
 
 @end
+
+@protocol RoomDataSourceDelegate <MXKDataSourceDelegate>
+
+- (void)roomDataSource:(RoomDataSource*)roomDataSource didUpdateEncryptionTrustLevel:(RoomEncryptionTrustLevel)roomEncryptionTrustLevel;
+
+@end