Ensure cards hidden if you shouldn't be able to see them

forge-game/src/main/java/forge/game/card/Card.java

@@ -8528,19 +8528,43 @@ public class Card extends GameEntity implements Comparable<Card> {
     }
 
     public boolean canBeShownTo(final Player viewer) {
-        if (!isFaceDown()) {
+        Zone zone = this.getZone();
+        if (zone == null) { return false; } //cards can't be shown if they're not in a zone
+
+        switch (zone.getZoneType()) {
+        case Ante:
+        case Command:
+        case Exile:
+        case Battlefield:
+        case Graveyard:
+        case Stack:
+            //cards in these zones are visible to all
+            if (isFaceDown() && getController().isOpponentOf(viewer) && !hasKeyword("Your opponent may look at this card.")) {
+                break; //exception is face down cards controlled by opponents
+            }
             return true;
-        }
+        case Hand:
-        if (getController() == viewer && isInZone(ZoneType.Battlefield)) {
+        case Sideboard:
+            //face-up cards in these zones are hidden to opponents unless they specify otherwise
+            if (getController().isOpponentOf(viewer) && !hasKeyword("Your opponent may look at this card.")) {
+                break;
+            }
             return true;
+        case Library:
+        case PlanarDeck:
+        case SchemeDeck:
+            //cards in these zones are hidden to all unless they specify otherwise
+            if (getController() == viewer && hasKeyword("You may look at this card.")) {
+                return true;
+            }
+            if (getController().isOpponentOf(viewer) && hasKeyword("Your opponent may look at this card.")) {
+                return true;
+            }
+            break;
         }
+
+        //one last check to see if card can be shown
         final Game game = this.getGame();
-        if (getController() == viewer && hasKeyword("You may look at this card.")) {
-            return true;
-        }
-        if (getController().isOpponentOf(viewer) && hasKeyword("Your opponent may look at this card.")) {
-            return true;
-        }
         for (Card host : game.getCardsIn(ZoneType.Battlefield)) {
             final ArrayList<StaticAbility> staticAbilities = host.getStaticAbilities();
             for (final StaticAbility stAb : staticAbilities) {

forge-m-base/src/forge/screens/match/FControl.java

@@ -223,8 +223,25 @@ public class FControl {
         }
     }
 
+    public static Player getCurrentPlayer() {
+        // try current priority
+        Player currentPriority = game.getPhaseHandler().getPriorityPlayer();
+        if (null != currentPriority && currentPriority.getLobbyPlayer() == FServer.getLobby().getGuiPlayer()) {
+            return currentPriority;
+        }
+
+        // otherwise find just any player, belonging to this lobbyplayer
+        for (Player p : game.getPlayers()) {
+            if (p.getLobbyPlayer() == FServer.getLobby().getGuiPlayer()) {
+                return p;
+            }
+        }
+
+        return null;
+    }
+
     public static boolean mayShowCard(Card c) {
-        return true;// game == null || !gameHasHumanPlayer || c.canBeShownTo(getCurrentPlayer());
+        return game == null || !gameHasHumanPlayer || c.canBeShownTo(getCurrentPlayer());
     }
 
     public static void showCombat(Combat combat) {