Notes on Roblox Script Security with Remote Functions

Introduction

• Enhancing security in Roblox scripts.
• Focus on remote functions as a two-way communication feature.
• Example: Leader stats with coin transactions for purchasing a button.

Remote Functions vs Remote Events

Communication Types

• Remote Events: One-way communication.
  • Client to Server
  • Server to Client
  • Server to All Clients
• Remote Functions: Two-way communication.
  • Client communicates to Server and receives a result back.

Diagram Reference

• Previous episodes included a diagram illustrating server-client communication.
• Remote functions allow for specific responses back to the client.

Implementation Steps

1. Setup Leader Stats
   • Create script in Server Script Service to initialize player coins (50).
2. Create GUI
   • Screen GUI: Add text label and button for purchasing.
   • Text label: "Would you like to buy this button for 50 coins?"
   • Button: "Buy Button (50 coins)"
3. Local Script
   • Create a local script to reference GUI elements and remote function.
   • Call remote function to notify the server when the button is clicked.
   • Use invoke instead of fire server to call the server and return responses.
4. Server Script Changes
   • Use onServerInvoke to handle server responses.
   • Check if player has enough coins and deduct if successful.
   • Send boolean to client indicating purchase success or failure.

Syntax Differences

• onServerInvoke:
  • Syntax: byButtonRemote.onServerInvoke = function(player, ...)
  • Callback vs Event:
    • Callbacks require parameters and are structured differently from events.
    • Events can trigger multiple times without waiting for responses.

Challenge

• Create a tools shop system using remote functions.
• Requirements:
  1. Use a remote function.
  2. Create at least three buttons/tools.
  3. Implement clone function to transfer tools into player’s backpack.

Implementation of the Shop System

1. Tools Setup: Use random tools from the toolbox and place them into Server Storage.
2. GUI Setup:
   • Create shop GUI with buttons for each tool (e.g., sword, flashlight, knife).
   • Assign different prices to each tool.
3. Script Functionality:
   • Reference all buttons and set up mouse click events for purchasing.
   • Pass tool name and price to the server on purchase attempts.
   • Check if player has enough coins; use the clone function to transfer the tool.
   • Update the GUI based on purchase success or failure.

Testing the Shop System

• Test purchase functionality for each button.
• Validate the addition of purchased tools to the player’s backpack.
• Verify messages on successful and failed purchases.

Conclusion

• Remote functions enhance communication in Roblox scripting.
• Successfully implemented a shop system using learned concepts.
• Encouragement to join the community and continue learning through future episodes.