Simple Lua script for making a token request against the Force.com REST APIs.

gettoken.lua

local secretKey = "YOUR_SECRET_KEY"

local data = {
    client_id = "YOUR_CONSUMER_KEY",
    client_secret = "YOUR_CONSUMER_SECRET",
    grant_type = "password",
    username = "YOUR_LOGIN",
    password = "YOUR_PASSWORD" .. secretKey
}

local response = http.request {
    method = "POST",
    headers= {["Content-Type"]="application/x-www-form-urlencoded"},
    url = 'https://login.salesforce.com/services/oauth2/token',
    data = data
}

local tokenResponse = json.parse(response.content)