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

Riot/Modules/Room/DataSources/RoomDataSource.m

@@ -44,6 +44,10 @@
 // Timer used to debounce cells refresh
 @property (nonatomic, strong) NSTimer *refreshCellsTimer;
 
+@property (nonatomic, readonly) id<RoomDataSourceDelegate> roomDataSourceDelegate;
+
+@property(nonatomic, readwrite) RoomEncryptionTrustLevel encryptionTrustLevel;
+
 @end
 
 @implementation RoomDataSource
@@ -83,6 +87,9 @@
         
         [self registerKeyVerificationRequestNotification];
         [self registerDeviceVerificationTransactionNotification];
+        [self registerTrustLevelDidChangeNotifications];
+        
+        self.encryptionTrustLevel = RoomEncryptionTrustLevelUnknown;
     }
     return self;
 }
@@ -105,6 +112,21 @@
             NSLog(@"[MXKRoomDataSource] finalizeRoomDataSource: Cannot retrieve all room members");
         }];
     }
+    
+    if (self.room.summary.isEncrypted)
+    {
+        [self fetchEncryptionTrustedLevel];
+    }
+}
+
+- (id<RoomDataSourceDelegate>)roomDataSourceDelegate
+{
+    if (!self.delegate || ![self.delegate conformsToProtocol:@protocol(RoomDataSourceDelegate)])
+    {
+        return nil;
+    }
+    
+    return ((id<RoomDataSourceDelegate>)(self.delegate));
 }
 
 - (void)updateEventFormatter
@@ -167,6 +189,88 @@
     }
 }
 
+#pragma mark Encryption trust level
+
+- (void)registerTrustLevelDidChangeNotifications
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceInfoTrustLevelDidChange:) name:MXDeviceInfoTrustLevelDidChangeNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(crossSigningInfoTrustLevelDidChange:) name:MXCrossSigningInfoTrustLevelDidChangeNotification object:nil];
+}
+
+- (void)deviceInfoTrustLevelDidChange:(NSNotification*)notification
+{
+    MXDeviceInfo *deviceInfo = notification.object;
+    
+    NSString *userId = deviceInfo.userId;
+    
+    if (userId)
+    {
+        [self encryptionTrustLevelDidChangeRelatedToUserId:userId];
+    }
+}
+
+- (void)crossSigningInfoTrustLevelDidChange:(NSNotification*)notification
+{
+    MXCrossSigningInfo *crossSigningInfo = notification.object;
+    
+    NSString *userId = crossSigningInfo.userId;
+    
+    if (userId)
+    {
+        [self encryptionTrustLevelDidChangeRelatedToUserId:userId];
+    }
+}
+
+- (void)fetchEncryptionTrustedLevel
+{
+    [self encryptionTrustLevelDidChangeRelatedToUserId:self.mxSession.myUser.userId];
+}
+
+- (void)encryptionTrustLevelDidChangeRelatedToUserId:(NSString*)userId
+{
+    if (!self.room.summary.isEncrypted)
+    {
+        return;
+    }
+    
+    [self.room members:^(MXRoomMembers *roomMembers) {
+        MXRoomMember *roomMember = [roomMembers memberWithUserId:userId];
+        
+        // If user belongs to the room refresh the trust level
+        if (roomMember)
+        {
+            [self.room trustedMembersProgressWithSuccess:^(NSProgress *trustedMembersProgress) {
+                
+                RoomEncryptionTrustLevel roomEncryptionTrustLevel;
+                
+                double trustedMembersPercentage = trustedMembersProgress.fractionCompleted;
+                
+                if (trustedMembersPercentage >= 1.0)
+                {
+                    roomEncryptionTrustLevel = RoomEncryptionTrustLevelTrusted;
+                }
+                else if (trustedMembersPercentage == 0.0)
+                {
+                    roomEncryptionTrustLevel = RoomEncryptionTrustLevelNormal;
+                }
+                else
+                {
+                    roomEncryptionTrustLevel = RoomEncryptionTrustLevelWarning;
+                }
+                
+                self.encryptionTrustLevel = roomEncryptionTrustLevel;
+                [self.roomDataSourceDelegate roomDataSource:self didUpdateEncryptionTrustLevel:roomEncryptionTrustLevel];
+                
+            } failure:^(NSError *error) {
+                NSLog(@"[RoomDataSource] trustLevelDidChangeRelatedToUserId fails to retrieve room members trusted progress");
+            }];
+        }
+        
+    } failure:^(NSError *error) {
+        NSLog(@"[RoomDataSource] trustLevelDidChangeRelatedToUserId fails to retrieve room members");
+    }];
+}
+
 #pragma  mark -
 
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section