SlashDupe

Adds a configurable /dupe command that lets players duplicate the item currently in their hand.

Without any restrictions, item duplication can completely break your server's economy and progression. SlashDupe gives you full control — blacklist specific items, block or scan shulker boxes for blacklisted items, cooldowns between 2 dupes.

Features:

Duplicates the exact amount of the item in your hand
Configurable cooldown between uses
Full item blacklist to block specific materials from being duped
Shulker box protection — block all shulker duping or scan contents for blacklisted items
All messages customizable with color codes
Console logging of every dupe action
Live config reload via /dupe reload

Default Config.yml

# ================================
#     SlashDupe Configuration
# ================================

settings:
  # Enable or disable /dupe entirely
  enabled: true

  # Allow duping the item in offhand
  allow_offhand: true

  # Max stack size override (-1 = Minecraft default)
  max_stack_size: -1

  # Cooldown in seconds (0 = no cooldown)
  cooldown: 5

  # Block duping shulker boxes entirely
  # true  = shulker boxes cannot be duped at all
  # false = shulker boxes can be duped but contents are checked for blacklisted items
  block_shulker_dupe: true

# ================================
#       Permission Defaults
# ================================
# true  = everyone can use
# false = OP only
permission_defaults:
  dupe.use: true
  dupe.bypass.cooldown: false
  dupe.bypass.blacklist: false
  dupe.admin: false

# ================================
#          Permissions
# ================================
permissions:
  use: "dupe.use"
  bypass_cooldown: "dupe.bypass.cooldown"
  bypass_blacklist: "dupe.bypass.blacklist"
  admin: "dupe.admin"

# ================================
#           Blacklist
# ================================
blacklist:
  # Enable or disable the blacklist
  enabled: true

  # Items that cannot be duped
  # Use Minecraft material names (all caps, underscores)
  items:
    - BEDROCK
    - BARRIER
    - COMMAND_BLOCK
    - CHAIN_COMMAND_BLOCK
    - REPEATING_COMMAND_BLOCK
    - STRUCTURE_BLOCK
    - ELYTRA
    - TOTEM_OF_UNDYING

# ================================
#           Messages
# ================================
# Supports & color codes
# Placeholders: {player} {item} {amount} {cooldown}
messages:
  no_permission: "&cYou don't have permission to use this command."
  nothing_in_hand: "&cYou must be holding an item to dupe it."
  item_blacklisted: "&cThis item cannot be duped."
  shulker_blocked: "&cYou cannot dupe shulker boxes."
  shulker_contains_blacklisted: "&cThis shulker box contains a blacklisted item and cannot be duped."
  success: "&aSuccessfully duped &e{item}&a!"
  cooldown_active: "&cPlease wait &e{cooldown}s &cbefore duping again."
  inventory_full: "&cYour inventory is full!"
  plugin_disabled: "&cThe dupe command is currently disabled."
  reloaded: "&aSlashDupe config reloaded!"

# ================================
#            Logging
# ================================
logging:
  # Log every dupe action to console
  log_to_console: true

  # Placeholders: {player} {item} {amount}
  log_format: "[SlashDupe] {player} duped {item} x{amount}"