GW2 Item/Recipe ID Toolkit

# GW2 Item/Recipe ID Toolkit
# Authored by Reddit user NotTheHead
# On December 24, 2013
#
# It should be noted that much of the error checking that could be
# included is left out for simplicity's sake. Don't use negative
# numbers or zero and you should be fine.

from base64 import *

def GetRecipeCode(recipe_id):
  """Using a Recipe's ID, create a chat code you can share in-game.

     Parameters:
     recipe_id   -- The ID of the recipe to create a chat code for.

     Returns:
     A string containing the chat code to type in-game.
     """
  hexa = '\x09'
  for i in range(4): #For both Python 3 and 2.
    #Little endian format
    hexa += chr(recipe_id % 256)
    recipe_id /= 256
  return '[&' + b64encode(hexa) + ']'

def GetItemCode(item_id, num_items=1):
  """Using an Item's ID, create a chat code you can share in-game.

     Parameters:
     item_id   -- The ID of the item to create a chat code for.

     Returns:
     A string containing the chat code to type in-game.
     """
  hexa = '\x02' + chr(num_items)
  for i in range(4): #For both Python 3 and 2.
    #Little endian format
    hexa += chr(item_id % 256)
    item_id /= 256
  return '[&' + b64encode(hexa) + ']'

def GetChatCodeB64(chat_code):
  """Strips the [& and ] off of the chat code, if they are on the
     chat code at all.

     Parameters:
     chat_code   -- The chat code to be processed.

     Returns:
     A string containing the chat code's b64 portion without the
     containing braces.
     """
  if chat_code[0] == '[':
    chat_code = chat_code[1:]
  if chat_code[0] == '&':
    chat_code = chat_code[1:]
  if chat_code[-1] == ']':
    chat_code = chat_code[:-1]
  return chat_code

def GetRecipeID(chat_code):
  """Using a Recipe's chat code, retrieve the Recipe's ID.

     WARNING: Do not use the chat code given in-game. As of the writing
     of this code, those item codes are wrong. They use an incorrect
     header, and some give the wrong ID as well.

     Parameters:
     chat_code   -- The chat code of the recipe.

     Returns:
     The recipe's ID in numerical form.
     """
  hexa = b64decode(GetChatCodeB64(chat_code))[1:] #Remove header
  decimal = 0
  for byte in reversed(hexa): #Little endian format
    decimal *= 256
    decimal += ord(byte)
  return decimal

def GetItemID(chat_code):
  """Using an Item's chat code, retrieve the Recipe's ID.

     Parameters:
     chat_code   -- The chat code of the item.

     Returns:
     The item's ID in numerical form.
     """
  hexa = b64decode(GetChatCodeB64(chat_code))[2:] #Remove header
  decimal = 0
  for byte in reversed(hexa): #Little endian format
    decimal *= 256
    decimal += ord(byte)
  return decimal