Allow computers and inventories to be locked

Just like vanilla locking, this isn't accessible in survival.

> "im retired! im retired!!", i continue to insist as i slowly shrink
> and transform into a corn cob.

src/main/java/dan200/computercraft/shared/common/TileGeneric.java

@@ -62,10 +62,9 @@ public abstract class TileGeneric extends TileEntity
         return 8.0;
     }
 
-    public boolean isUsable( PlayerEntity player, boolean ignoreRange )
+    public boolean isUsable( PlayerEntity player )
     {
         if( player == null || !player.isAlive() || getLevel().getBlockEntity( getBlockPos() ) != this ) return false;
-        if( ignoreRange ) return true;
 
         double range = getInteractRange( player );
         BlockPos pos = getBlockPos();

src/main/java/dan200/computercraft/shared/computer/blocks/TileCommandComputer.java

@@ -113,12 +113,12 @@ public class TileCommandComputer extends TileComputer
     }
 
     @Override
-    public boolean isUsable( PlayerEntity player, boolean ignoreRange )
+    public boolean isUsable( PlayerEntity player )
     {
-        return isUsable( player ) && super.isUsable( player, ignoreRange );
+        return isCommandUsable( player ) && super.isUsable( player );
     }
 
-    public static boolean isUsable( PlayerEntity player )
+    public static boolean isCommandUsable( PlayerEntity player )
     {
         MinecraftServer server = player.getServer();
         if( server == null || !server.isCommandBlockEnabled() )

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputer.java

@@ -53,7 +53,7 @@ public class TileComputer extends TileComputerBase
 
     protected boolean isUsableByPlayer( PlayerEntity player )
     {
-        return isUsable( player, false );
+        return isUsable( player );
     }
 
     @Override

src/main/java/dan200/computercraft/shared/computer/blocks/TileComputerBase.java

@@ -26,6 +26,7 @@ import net.minecraft.item.Items;
 import net.minecraft.nbt.CompoundNBT;
 import net.minecraft.network.play.server.SUpdateTileEntityPacket;
 import net.minecraft.tileentity.ITickableTileEntity;
+import net.minecraft.tileentity.LockableTileEntity;
 import net.minecraft.tileentity.TileEntityType;
 import net.minecraft.util.ActionResultType;
 import net.minecraft.util.Direction;
@@ -36,6 +37,7 @@ import net.minecraft.util.math.BlockRayTraceResult;
 import net.minecraft.util.text.ITextComponent;
 import net.minecraft.util.text.StringTextComponent;
 import net.minecraft.util.text.TranslationTextComponent;
+import net.minecraft.world.LockCode;
 import net.minecraftforge.common.util.NonNullConsumer;
 
 import javax.annotation.Nonnull;
@@ -58,6 +60,8 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
     private int invalidSides = 0;
     private final NonNullConsumer<Object>[] invalidate;
 
+    private LockCode lockCode = LockCode.NO_LOCK;
+
     private final ComputerFamily family;
 
     public TileComputerBase( TileEntityType<? extends TileGeneric> type, ComputerFamily family )
@@ -112,6 +116,12 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         return false;
     }
 
+    @Override
+    public boolean isUsable( PlayerEntity player )
+    {
+        return super.isUsable( player ) && LockableTileEntity.canUnlock( player, lockCode, getDisplayName() );
+    }
+
     @Nonnull
     @Override
     public ActionResultType onActivate( PlayerEntity player, Hand hand, BlockRayTraceResult hit )
@@ -130,7 +140,7 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         else if( !player.isCrouching() )
         {
             // Regular right click to activate computer
-            if( !getLevel().isClientSide && isUsable( player, false ) )
+            if( !getLevel().isClientSide && isUsable( player ) )
             {
                 createServerComputer().turnOn();
                 new ComputerContainerData( createServerComputer() ).open( player, this );
@@ -201,6 +211,8 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         if( label != null ) nbt.putString( NBT_LABEL, label );
         nbt.putBoolean( NBT_ON, on );
 
+        lockCode.addToTag( nbt );
+
         return super.save( nbt );
     }
 
@@ -213,6 +225,8 @@ public abstract class TileComputerBase extends TileGeneric implements IComputerT
         computerID = nbt.contains( NBT_ID ) ? nbt.getInt( NBT_ID ) : -1;
         label = nbt.contains( NBT_LABEL ) ? nbt.getString( NBT_LABEL ) : null;
         on = startOn = nbt.getBoolean( NBT_ON );
+
+        lockCode = LockCode.fromTag( nbt );
     }
 
     protected boolean isPeripheralBlockedOnSide( ComputerSide localSide )

src/main/java/dan200/computercraft/shared/computer/inventory/ContainerViewComputer.java

@@ -43,7 +43,7 @@ public class ContainerViewComputer extends ComputerMenuWithoutInventory
         }
 
         // If we're a command computer then ensure we're in creative
-        if( computer.getFamily() == ComputerFamily.COMMAND && !TileCommandComputer.isUsable( player ) )
+        if( computer.getFamily() == ComputerFamily.COMMAND && !TileCommandComputer.isCommandUsable( player ) )
         {
             return false;
         }

src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java

@@ -26,12 +26,14 @@ import net.minecraft.inventory.container.INamedContainerProvider;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.CompoundNBT;
 import net.minecraft.tileentity.ITickableTileEntity;
+import net.minecraft.tileentity.LockableTileEntity;
 import net.minecraft.tileentity.TileEntityType;
 import net.minecraft.util.*;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.BlockRayTraceResult;
 import net.minecraft.util.text.ITextComponent;
 import net.minecraft.util.text.TranslationTextComponent;
+import net.minecraft.world.LockCode;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
 import net.minecraftforge.fml.network.NetworkHooks;
@@ -58,6 +60,7 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
     }
 
     ITextComponent customName;
+    private LockCode lockCode;
 
     private final Map<IComputerAccess, MountInfo> computers = new HashMap<>();
 
@@ -92,6 +95,12 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
         peripheralCap = CapabilityUtil.invalidate( peripheralCap );
     }
 
+    @Override
+    public boolean isUsable( PlayerEntity player )
+    {
+        return super.isUsable( player ) && LockableTileEntity.canUnlock( player, lockCode, getDisplayName() );
+    }
+
     @Nonnull
     @Override
     public ActionResultType onActivate( PlayerEntity player, Hand hand, BlockRayTraceResult hit )
@@ -111,7 +120,10 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
         else
         {
             // Open the GUI
-            if( !getLevel().isClientSide ) NetworkHooks.openGui( (ServerPlayerEntity) player, this );
+            if( !getLevel().isClientSide && isUsable( player ) )
+            {
+                NetworkHooks.openGui( (ServerPlayerEntity) player, this );
+            }
             return ActionResultType.SUCCESS;
         }
     }
@@ -132,6 +144,8 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
             diskStack = ItemStack.of( item );
             diskMount = null;
         }
+
+        lockCode = LockCode.fromTag( nbt );
     }
 
     @Nonnull
@@ -146,6 +160,9 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
             diskStack.save( item );
             nbt.put( NBT_ITEM, item );
         }
+
+        lockCode.addToTag( nbt );
+
         return super.save( nbt );
     }
 
@@ -297,7 +314,7 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
     @Override
     public boolean stillValid( @Nonnull PlayerEntity player )
     {
-        return isUsable( player, false );
+        return isUsable( player );
     }
 
     @Override

src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java

@@ -22,12 +22,14 @@ import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.item.Items;
 import net.minecraft.nbt.CompoundNBT;
+import net.minecraft.tileentity.LockableTileEntity;
 import net.minecraft.tileentity.TileEntityType;
 import net.minecraft.util.*;
 import net.minecraft.util.math.BlockRayTraceResult;
 import net.minecraft.util.math.vector.Vector3d;
 import net.minecraft.util.text.ITextComponent;
 import net.minecraft.util.text.TranslationTextComponent;
+import net.minecraft.world.LockCode;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
 import net.minecraftforge.fml.network.NetworkHooks;
@@ -54,6 +56,7 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
     private static final int[] SIDE_SLOTS = new int[] { 0 };
 
     ITextComponent customName;
+    private LockCode lockCode;
 
     private final NonNullList<ItemStack> inventory = NonNullList.withSize( SLOTS, ItemStack.EMPTY );
     private final SidedCaps<IItemHandler> itemHandlerCaps =
@@ -83,13 +86,22 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
         peripheralCap = CapabilityUtil.invalidate( peripheralCap );
     }
 
+    @Override
+    public boolean isUsable( PlayerEntity player )
+    {
+        return super.isUsable( player ) && LockableTileEntity.canUnlock( player, lockCode, getDisplayName() );
+    }
+
     @Nonnull
     @Override
     public ActionResultType onActivate( PlayerEntity player, Hand hand, BlockRayTraceResult hit )
     {
         if( player.isCrouching() ) return ActionResultType.PASS;
 
-        if( !getLevel().isClientSide ) NetworkHooks.openGui( (ServerPlayerEntity) player, this );
+        if( !getLevel().isClientSide && isUsable( player ) )
+        {
+            NetworkHooks.openGui( (ServerPlayerEntity) player, this );
+        }
         return ActionResultType.SUCCESS;
     }
 
@@ -110,6 +122,8 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
 
         // Read inventory
         ItemStackHelper.loadAllItems( nbt, inventory );
+
+        lockCode = LockCode.fromTag( nbt );
     }
 
     @Nonnull
@@ -129,6 +143,8 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
         // Write inventory
         ItemStackHelper.saveAllItems( nbt, inventory );
 
+        lockCode.addToTag( nbt );
+
         return super.save( nbt );
     }
 
@@ -231,7 +247,7 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
     @Override
     public boolean stillValid( @Nonnull PlayerEntity playerEntity )
     {
-        return isUsable( playerEntity, false );
+        return isUsable( playerEntity );
     }
 
     // ISidedInventory implementation

src/main/java/dan200/computercraft/shared/turtle/blocks/TileTurtle.java

@@ -479,7 +479,7 @@ public class TileTurtle extends TileComputerBase implements ITurtleTile, Default
     @Override
     public boolean stillValid( @Nonnull PlayerEntity player )
     {
-        return isUsable( player, false );
+        return isUsable( player );
     }
 
     private void onInventoryDefinitelyChanged()