624 lines
16 KiB
Lua
624 lines
16 KiB
Lua
--[[
|
|
Moonshark Lua Sandbox Environment
|
|
|
|
This file contains all the Lua code needed for the sandbox environment,
|
|
including core modules and utilities. It's designed to be embedded in the
|
|
Go binary at build time.
|
|
]]--
|
|
|
|
__http_response = {}
|
|
__module_paths = {}
|
|
__module_bytecode = {}
|
|
__ready_modules = {}
|
|
__EXIT_SENTINEL = {} -- Unique object for exit identification
|
|
|
|
-- ======================================================================
|
|
-- CORE SANDBOX FUNCTIONALITY
|
|
-- ======================================================================
|
|
|
|
function exit()
|
|
error(__EXIT_SENTINEL)
|
|
end
|
|
|
|
-- Create environment inheriting from _G
|
|
function __create_env(ctx)
|
|
local env = setmetatable({}, {__index = _G})
|
|
|
|
if ctx then
|
|
env.ctx = ctx
|
|
end
|
|
|
|
if __setup_require then
|
|
__setup_require(env)
|
|
end
|
|
|
|
return env
|
|
end
|
|
|
|
-- Execute script with clean environment
|
|
function __execute_script(fn, ctx)
|
|
__http_response = nil
|
|
|
|
local env = __create_env(ctx)
|
|
env.exit = exit
|
|
setfenv(fn, env)
|
|
|
|
local ok, result = pcall(fn)
|
|
if not ok then
|
|
if result == __EXIT_SENTINEL then
|
|
return
|
|
end
|
|
|
|
error(result, 0)
|
|
end
|
|
|
|
return result
|
|
end
|
|
|
|
-- Ensure __http_response exists, then return it
|
|
function __ensure_response()
|
|
if not __http_response then
|
|
__http_response = {}
|
|
end
|
|
return __http_response
|
|
end
|
|
|
|
-- ======================================================================
|
|
-- HTTP MODULE
|
|
-- ======================================================================
|
|
|
|
local http = {
|
|
-- Set HTTP status code
|
|
set_status = function(code)
|
|
if type(code) ~= "number" then
|
|
error("http.set_status: status code must be a number", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.status = code
|
|
end,
|
|
|
|
-- Set HTTP header
|
|
set_header = function(name, value)
|
|
if type(name) ~= "string" or type(value) ~= "string" then
|
|
error("http.set_header: name and value must be strings", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.headers = resp.headers or {}
|
|
resp.headers[name] = value
|
|
end,
|
|
|
|
-- Set content type; set_header helper
|
|
set_content_type = function(content_type)
|
|
http.set_header("Content-Type", content_type)
|
|
end,
|
|
|
|
-- Set metadata (arbitrary data to be returned with response)
|
|
set_metadata = function(key, value)
|
|
if type(key) ~= "string" then
|
|
error("http.set_metadata: key must be a string", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.metadata = resp.metadata or {}
|
|
resp.metadata[key] = value
|
|
end,
|
|
|
|
-- HTTP client submodule
|
|
client = {
|
|
-- Generic request function
|
|
request = function(method, url, body, options)
|
|
if type(method) ~= "string" then
|
|
error("http.client.request: method must be a string", 2)
|
|
end
|
|
if type(url) ~= "string" then
|
|
error("http.client.request: url must be a string", 2)
|
|
end
|
|
|
|
-- Call native implementation
|
|
local result = __http_request(method, url, body, options)
|
|
return result
|
|
end,
|
|
|
|
-- Shorthand function to directly get JSON
|
|
get_json = function(url, options)
|
|
options = options or {}
|
|
local response = http.client.get(url, options)
|
|
if response.ok and response.json then
|
|
return response.json
|
|
end
|
|
return nil, response
|
|
end,
|
|
|
|
-- Utility to build a URL with query parameters
|
|
build_url = function(base_url, params)
|
|
if not params or type(params) ~= "table" then
|
|
return base_url
|
|
end
|
|
|
|
local query = {}
|
|
for k, v in pairs(params) do
|
|
if type(v) == "table" then
|
|
for _, item in ipairs(v) do
|
|
table.insert(query, k .. "=" .. tostring(item))
|
|
end
|
|
else
|
|
table.insert(query, k .. "=" .. tostring(v))
|
|
end
|
|
end
|
|
|
|
if #query > 0 then
|
|
if base_url:find("?") then
|
|
return base_url .. "&" .. table.concat(query, "&")
|
|
else
|
|
return base_url .. "?" .. table.concat(query, "&")
|
|
end
|
|
end
|
|
|
|
return base_url
|
|
end
|
|
}
|
|
}
|
|
|
|
local function make_method(method, needs_body)
|
|
return function(url, body_or_options, options)
|
|
if needs_body then
|
|
options = options or {}
|
|
return http.client.request(method, url, body_or_options, options)
|
|
else
|
|
body_or_options = body_or_options or {}
|
|
return http.client.request(method, url, nil, body_or_options)
|
|
end
|
|
end
|
|
end
|
|
|
|
http.client.get = make_method("GET", false)
|
|
http.client.delete = make_method("DELETE", false)
|
|
http.client.head = make_method("HEAD", false)
|
|
http.client.options = make_method("OPTIONS", false)
|
|
http.client.post = make_method("POST", true)
|
|
http.client.put = make_method("PUT", true)
|
|
http.client.patch = make_method("PATCH", true)
|
|
|
|
http.redirect = function(url, status)
|
|
if type(url) ~= "string" then
|
|
error("http.redirect: url must be a string", 2)
|
|
end
|
|
|
|
status = status or 302 -- Default to temporary redirect
|
|
|
|
local resp = __ensure_response()
|
|
resp.status = status
|
|
|
|
resp.headers = resp.headers or {}
|
|
resp.headers["Location"] = url
|
|
|
|
exit()
|
|
end
|
|
|
|
-- ======================================================================
|
|
-- COOKIE MODULE
|
|
-- ======================================================================
|
|
|
|
local cookie = {
|
|
-- Set a cookie
|
|
set = function(name, value, options)
|
|
if type(name) ~= "string" then
|
|
error("cookie.set: name must be a string", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.cookies = resp.cookies or {}
|
|
|
|
local opts = options or {}
|
|
local cookie = {
|
|
name = name,
|
|
value = value or "",
|
|
path = opts.path or "/",
|
|
domain = opts.domain
|
|
}
|
|
|
|
if opts.expires then
|
|
if type(opts.expires) == "number" then
|
|
if opts.expires > 0 then
|
|
cookie.max_age = opts.expires
|
|
local now = os.time()
|
|
cookie.expires = now + opts.expires
|
|
elseif opts.expires < 0 then
|
|
cookie.expires = 1
|
|
cookie.max_age = 0
|
|
end
|
|
-- opts.expires == 0: Session cookie (omitting both expires and max-age)
|
|
end
|
|
end
|
|
|
|
cookie.secure = (opts.secure ~= false)
|
|
cookie.http_only = (opts.http_only ~= false)
|
|
|
|
if opts.same_site then
|
|
local valid_values = {none = true, lax = true, strict = true}
|
|
local same_site = string.lower(opts.same_site)
|
|
|
|
if not valid_values[same_site] then
|
|
error("cookie.set: same_site must be one of 'None', 'Lax', or 'Strict'", 2)
|
|
end
|
|
|
|
-- If SameSite=None, the cookie must be secure
|
|
if same_site == "none" and not cookie.secure then
|
|
cookie.secure = true
|
|
end
|
|
|
|
cookie.same_site = opts.same_site
|
|
else
|
|
cookie.same_site = "Lax"
|
|
end
|
|
|
|
table.insert(resp.cookies, cookie)
|
|
return true
|
|
end,
|
|
|
|
-- Get a cookie value
|
|
get = function(name)
|
|
if type(name) ~= "string" then
|
|
error("cookie.get: name must be a string", 2)
|
|
end
|
|
|
|
local env = getfenv(2)
|
|
|
|
if env.ctx and env.ctx.cookies then
|
|
return env.ctx.cookies[name]
|
|
end
|
|
|
|
if env.ctx and env.ctx._request_cookies then
|
|
return env.ctx._request_cookies[name]
|
|
end
|
|
|
|
return nil
|
|
end,
|
|
|
|
-- Remove a cookie
|
|
remove = function(name, path, domain)
|
|
if type(name) ~= "string" then
|
|
error("cookie.remove: name must be a string", 2)
|
|
end
|
|
|
|
return cookie.set(name, "", {expires = 0, path = path or "/", domain = domain})
|
|
end
|
|
}
|
|
|
|
-- ======================================================================
|
|
-- SESSION MODULE
|
|
-- ======================================================================
|
|
|
|
local session = {
|
|
get = function(key)
|
|
if type(key) ~= "string" then
|
|
error("session.get: key must be a string", 2)
|
|
end
|
|
|
|
local env = getfenv(2)
|
|
|
|
if env.ctx and env.ctx.session and env.ctx.session.data then
|
|
return env.ctx.session.data[key]
|
|
end
|
|
|
|
return nil
|
|
end,
|
|
|
|
set = function(key, value)
|
|
if type(key) ~= "string" then
|
|
error("session.set: key must be a string", 2)
|
|
end
|
|
if type(value) == nil then
|
|
error("session.set: value cannot be nil", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.session = resp.session or {}
|
|
resp.session[key] = value
|
|
end,
|
|
|
|
id = function()
|
|
local env = getfenv(2)
|
|
|
|
if env.ctx and env.ctx.session then
|
|
return env.ctx.session.id
|
|
end
|
|
|
|
return nil
|
|
end,
|
|
|
|
get_all = function()
|
|
local env = getfenv(2)
|
|
|
|
if env.ctx and env.ctx.session then
|
|
return env.ctx.session.data
|
|
end
|
|
|
|
return nil
|
|
end,
|
|
|
|
delete = function(key)
|
|
if type(key) ~= "string" then
|
|
error("session.delete: key must be a string", 2)
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.session = resp.session or {}
|
|
resp.session[key] = "__SESSION_DELETE_MARKER__"
|
|
|
|
local env = getfenv(2)
|
|
if env.ctx and env.ctx.session and env.ctx.session.data then
|
|
env.ctx.session.data[key] = nil
|
|
end
|
|
end,
|
|
|
|
clear = function()
|
|
local env = getfenv(2)
|
|
if env.ctx and env.ctx.session and env.ctx.session.data then
|
|
for k, _ in pairs(env.ctx.session.data) do
|
|
env.ctx.session.data[k] = nil
|
|
end
|
|
end
|
|
|
|
local resp = __ensure_response()
|
|
resp.session = {}
|
|
|
|
resp.session["__clear_all"] = true
|
|
end
|
|
}
|
|
|
|
-- ======================================================================
|
|
-- CSRF MODULE
|
|
-- ======================================================================
|
|
|
|
local csrf = {
|
|
generate = function()
|
|
local token = util.generate_token(32)
|
|
session.set("_csrf_token", token)
|
|
return token
|
|
end,
|
|
|
|
field = function()
|
|
local token = session.get("_csrf_token")
|
|
if not token then
|
|
token = csrf.generate()
|
|
end
|
|
return string.format('<input type="hidden" name="_csrf_token" value="%s" />', token)
|
|
end,
|
|
|
|
validate = function()
|
|
local env = getfenv(2)
|
|
local token = false
|
|
if env.ctx and env.ctx.session and env.ctx.session.data then
|
|
token = env.ctx.session.data["_csrf_token"]
|
|
end
|
|
|
|
if not token then
|
|
http.set_status(403)
|
|
__http_response.body = "CSRF validation failed"
|
|
exit()
|
|
end
|
|
|
|
local request_token = nil
|
|
if env.ctx and env.ctx.form then
|
|
request_token = env.ctx.form._csrf_token
|
|
end
|
|
|
|
if not request_token and env.ctx and env.ctx._request_headers then
|
|
request_token = env.ctx._request_headers["x-csrf-token"] or
|
|
env.ctx._request_headers["csrf-token"]
|
|
end
|
|
|
|
if not request_token or request_token ~= token then
|
|
http.set_status(403)
|
|
__http_response.body = "CSRF validation failed"
|
|
exit()
|
|
end
|
|
|
|
return true
|
|
end
|
|
}
|
|
|
|
-- ======================================================================
|
|
-- UTIL MODULE
|
|
-- ======================================================================
|
|
|
|
-- Utility module implementation
|
|
local util = {
|
|
generate_token = function(length)
|
|
return __generate_token(length or 32)
|
|
end,
|
|
|
|
-- Deep copy of tables
|
|
deep_copy = function(obj)
|
|
if type(obj) ~= 'table' then return obj end
|
|
local res = {}
|
|
for k, v in pairs(obj) do res[k] = util.deep_copy(v) end
|
|
return res
|
|
end,
|
|
|
|
-- Merge tables
|
|
merge_tables = function(t1, t2)
|
|
if type(t1) ~= 'table' or type(t2) ~= 'table' then
|
|
error("Both arguments must be tables", 2)
|
|
end
|
|
|
|
local result = util.deep_copy(t1)
|
|
for k, v in pairs(t2) do
|
|
if type(v) == 'table' and type(result[k]) == 'table' then
|
|
result[k] = util.merge_tables(result[k], v)
|
|
else
|
|
result[k] = v
|
|
end
|
|
end
|
|
return result
|
|
end,
|
|
|
|
-- String utilities
|
|
string = {
|
|
-- Trim whitespace
|
|
trim = function(s)
|
|
return (s:gsub("^%s*(.-)%s*$", "%1"))
|
|
end,
|
|
|
|
-- Split string
|
|
split = function(s, delimiter)
|
|
delimiter = delimiter or ","
|
|
local result = {}
|
|
for match in (s..delimiter):gmatch("(.-)"..delimiter) do
|
|
table.insert(result, match)
|
|
end
|
|
return result
|
|
end
|
|
}
|
|
}
|
|
|
|
-- ======================================================================
|
|
-- TEMPLATE RENDER FUNCTION
|
|
-- ======================================================================
|
|
|
|
_G.render = function(template_str, env)
|
|
local OPEN_TAG, CLOSE_TAG = "<?", "?>"
|
|
|
|
-- Helper functions
|
|
local function escape_html(s)
|
|
local entities = {['&']='&', ['<']='<', ['>']='>', ['"']='"', ["'"]='''}
|
|
return (s:gsub([=[["><'&]]=], entities))
|
|
end
|
|
|
|
local function get_line(s, ln)
|
|
for line in s:gmatch("([^\n]*)\n?") do
|
|
if ln == 1 then return line end
|
|
ln = ln - 1
|
|
end
|
|
end
|
|
|
|
local function pos_to_line(s, pos)
|
|
local line = 1
|
|
for _ in s:sub(1, pos):gmatch("\n") do line = line + 1 end
|
|
return line
|
|
end
|
|
|
|
-- Parse template
|
|
local pos, chunks = 1, {}
|
|
while pos <= #template_str do
|
|
local start, stop = template_str:find(OPEN_TAG, pos, true)
|
|
if not start then
|
|
table.insert(chunks, template_str:sub(pos))
|
|
break
|
|
end
|
|
|
|
if start > pos then
|
|
table.insert(chunks, template_str:sub(pos, start-1))
|
|
end
|
|
|
|
pos = stop + 1
|
|
local modifier = template_str:match("^[=-]", pos)
|
|
if modifier then pos = pos + 1 end
|
|
|
|
local close_start, close_stop = template_str:find(CLOSE_TAG, pos, true)
|
|
if not close_start then
|
|
error("Failed to find closing tag at position " .. pos)
|
|
end
|
|
|
|
local trim_newline = false
|
|
if template_str:sub(close_start-1, close_start-1) == "-" then
|
|
close_start = close_start - 1
|
|
trim_newline = true
|
|
end
|
|
|
|
local code = template_str:sub(pos, close_start-1)
|
|
table.insert(chunks, {modifier or "code", code, pos})
|
|
|
|
pos = close_stop + 1
|
|
if trim_newline and template_str:sub(pos, pos) == "\n" then
|
|
pos = pos + 1
|
|
end
|
|
end
|
|
|
|
-- Compile chunks to Lua code
|
|
local buffer = {"local _tostring, _escape, _b, _b_i = ...\n"}
|
|
for _, chunk in ipairs(chunks) do
|
|
local t = type(chunk)
|
|
if t == "string" then
|
|
table.insert(buffer, "_b_i = _b_i + 1\n")
|
|
table.insert(buffer, "_b[_b_i] = " .. string.format("%q", chunk) .. "\n")
|
|
else
|
|
t = chunk[1]
|
|
if t == "code" then
|
|
table.insert(buffer, "--[[" .. chunk[3] .. "]] " .. chunk[2] .. "\n")
|
|
elseif t == "=" or t == "-" then
|
|
table.insert(buffer, "_b_i = _b_i + 1\n")
|
|
table.insert(buffer, "--[[" .. chunk[3] .. "]] _b[_b_i] = ")
|
|
if t == "=" then
|
|
table.insert(buffer, "_escape(_tostring(" .. chunk[2] .. "))\n")
|
|
else
|
|
table.insert(buffer, "_tostring(" .. chunk[2] .. ")\n")
|
|
end
|
|
end
|
|
end
|
|
end
|
|
table.insert(buffer, "return _b")
|
|
|
|
-- Load the compiled code
|
|
local fn, err = loadstring(table.concat(buffer))
|
|
if not fn then error(err) end
|
|
|
|
-- Create execution environment
|
|
env = env or {}
|
|
local runtime_env = setmetatable({}, {__index = function(_, k) return env[k] or _G[k] end})
|
|
|
|
setfenv(fn, runtime_env)
|
|
|
|
local output_buffer = {}
|
|
fn(tostring, escape_html, output_buffer, 0)
|
|
return table.concat(output_buffer)
|
|
end
|
|
|
|
-- ======================================================================
|
|
-- PASSWORD MODULE
|
|
-- ======================================================================
|
|
|
|
local password = {}
|
|
|
|
-- Hash a password using Argon2id
|
|
-- Options:
|
|
-- memory: Amount of memory to use in KB (default: 64MB)
|
|
-- iterations: Number of iterations (default: 3)
|
|
-- parallelism: Number of threads (default: 4)
|
|
-- salt_length: Length of salt in bytes (default: 16)
|
|
-- key_length: Length of the derived key in bytes (default: 32)
|
|
function password.hash(plain_password, options)
|
|
if type(plain_password) ~= "string" then
|
|
error("password.hash: expected string password", 2)
|
|
end
|
|
|
|
return __password_hash(plain_password, options)
|
|
end
|
|
|
|
-- Verify a password against a hash
|
|
function password.verify(plain_password, hash_string)
|
|
if type(plain_password) ~= "string" then
|
|
error("password.verify: expected string password", 2)
|
|
end
|
|
|
|
if type(hash_string) ~= "string" then
|
|
error("password.verify: expected string hash", 2)
|
|
end
|
|
|
|
return __password_verify(plain_password, hash_string)
|
|
end
|
|
|
|
-- ======================================================================
|
|
-- REGISTER MODULES GLOBALLY
|
|
-- ======================================================================
|
|
|
|
_G.http = http
|
|
_G.session = session
|
|
_G.csrf = csrf
|
|
_G.cookie = cookie
|
|
_G.util = util
|
|
_G.password = password
|