257 lines
6.6 KiB
Go
257 lines
6.6 KiB
Go
package runner
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import (
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"fmt"
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"sync"
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"github.com/goccy/go-json"
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"github.com/valyala/bytebufferpool"
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luajit "git.sharkk.net/Sky/LuaJIT-to-Go"
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"git.sharkk.net/Sky/Moonshark/core/logger"
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)
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// Sandbox provides a secure execution environment for Lua scripts
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type Sandbox struct {
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modules map[string]any // Custom modules for environment
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debug bool // Enable debug output
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mu sync.RWMutex // Protects modules
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}
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// NewSandbox creates a new sandbox environment
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func NewSandbox() *Sandbox {
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return &Sandbox{
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modules: make(map[string]any, 8), // Pre-allocate with reasonable capacity
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debug: false,
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}
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}
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// EnableDebug turns on debug logging
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func (s *Sandbox) EnableDebug() {
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s.debug = true
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}
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// debugLog logs a message if debug mode is enabled
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func (s *Sandbox) debugLog(format string, args ...interface{}) {
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if s.debug {
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logger.Debug("Sandbox "+format, args...)
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}
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}
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// debugLog logs a message if debug mode is enabled
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func (s *Sandbox) debugLogCont(format string, args ...interface{}) {
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if s.debug {
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logger.DebugCont(format, args...)
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}
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}
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// AddModule adds a module to the sandbox environment
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func (s *Sandbox) AddModule(name string, module any) {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.modules[name] = module
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s.debugLog("Added module: %s", name)
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}
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// Setup initializes the sandbox in a Lua state
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func (s *Sandbox) Setup(state *luajit.State, stateIndex int) error {
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verbose := stateIndex == 0
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if verbose {
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s.debugLog("is setting up...")
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}
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// Register modules in the global environment
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s.mu.RLock()
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for name, module := range s.modules {
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if verbose {
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s.debugLog("is registering module: %s", name)
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}
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if err := state.PushValue(module); err != nil {
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s.mu.RUnlock()
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if verbose {
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s.debugLog("failed to register module %s: %v", name, err)
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}
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return err
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}
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state.SetGlobal(name)
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}
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s.mu.RUnlock()
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// Initialize environment setup
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err := state.DoString(`
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-- Global tables for response handling
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__http_responses = __http_responses or {}
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-- Create environment inheriting from _G
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function __create_env(ctx)
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-- Create environment with metatable inheriting from _G
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local env = setmetatable({}, {__index = _G})
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-- Add context if provided
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if ctx then
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env.ctx = ctx
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end
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-- Add proper require function to this environment
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if __setup_require then
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__setup_require(env)
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end
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return env
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end
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-- Execute script with clean environment
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function __execute_script(fn, ctx)
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-- Clear previous responses
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__http_responses[1] = nil
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-- Create environment
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local env = __create_env(ctx)
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-- Set environment for function
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setfenv(fn, env)
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-- Execute with protected call
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local ok, result = pcall(fn)
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if not ok then
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error(result, 0)
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end
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return result
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end
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`)
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if err != nil {
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if verbose {
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s.debugLog("failed to set up...")
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s.debugLogCont("%v", err)
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}
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return err
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}
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if verbose {
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s.debugLogCont("Complete")
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}
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return nil
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}
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// Execute runs bytecode in the sandbox
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func (s *Sandbox) Execute(state *luajit.State, bytecode []byte, ctx map[string]any) (any, error) {
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// Create a temporary context if we only have a map
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if ctx != nil {
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tempCtx := &Context{
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Values: ctx,
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}
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return s.OptimizedExecute(state, bytecode, tempCtx)
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}
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// Just pass nil through if we have no context
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return s.OptimizedExecute(state, bytecode, nil)
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}
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// OptimizedExecute runs bytecode with a fasthttp context if available
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func (s *Sandbox) OptimizedExecute(state *luajit.State, bytecode []byte, ctx *Context) (any, error) {
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// Use a buffer from the pool for any string operations
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buf := bytebufferpool.Get()
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defer bytebufferpool.Put(buf)
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// Load bytecode
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if err := state.LoadBytecode(bytecode, "script"); err != nil {
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s.debugLog("Failed to load bytecode: %v", err)
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return nil, fmt.Errorf("failed to load script: %w", err)
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}
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// Prepare context values
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var ctxValues map[string]any
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if ctx != nil {
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ctxValues = ctx.Values
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} else {
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ctxValues = nil
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}
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// Prepare context table
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if ctxValues != nil {
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state.CreateTable(0, len(ctxValues))
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for k, v := range ctxValues {
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state.PushString(k)
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if err := state.PushValue(v); err != nil {
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state.Pop(2) // Pop key and table
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s.debugLog("Failed to push context value %s: %v", k, err)
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return nil, fmt.Errorf("failed to prepare context: %w", err)
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}
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state.SetTable(-3)
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}
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} else {
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state.PushNil() // No context
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}
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// Get execution function
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state.GetGlobal("__execute_script")
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if !state.IsFunction(-1) {
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state.Pop(2) // Pop context and non-function
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s.debugLog("__execute_script is not a function")
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return nil, fmt.Errorf("sandbox execution function not found")
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}
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// Stack setup for call: __execute_script, bytecode function, context
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state.PushCopy(-3) // bytecode function (copy from -3)
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state.PushCopy(-3) // context (copy from -3)
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// Clean up duplicate references
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state.Remove(-5) // Remove original bytecode function
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state.Remove(-4) // Remove original context
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// Call with 2 args (function, context), 1 result
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if err := state.Call(2, 1); err != nil {
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s.debugLog("Execution failed: %v", err)
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return nil, fmt.Errorf("script execution failed: %w", err)
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}
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// Get result
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result, err := state.ToValue(-1)
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state.Pop(1) // Pop result
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// Check for HTTP response
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httpResponse, hasResponse := GetHTTPResponse(state)
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if hasResponse {
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// Add the script result as the response body
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httpResponse.Body = result
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// If we have a fasthttp context, apply the response directly
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if ctx != nil && ctx.RequestCtx != nil {
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ApplyHTTPResponse(httpResponse, ctx.RequestCtx)
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ReleaseResponse(httpResponse)
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return nil, nil // No need to return response object
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}
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return httpResponse, nil
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}
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// If we have a fasthttp context and the result needs to be written directly
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if ctx != nil && ctx.RequestCtx != nil && (result != nil) {
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// For direct HTTP responses
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switch r := result.(type) {
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case string:
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ctx.RequestCtx.SetBodyString(r)
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case []byte:
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ctx.RequestCtx.SetBody(r)
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case map[string]any, []any:
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// JSON response
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ctx.RequestCtx.Response.Header.SetContentType("application/json")
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if err := json.NewEncoder(buf).Encode(r); err == nil {
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ctx.RequestCtx.SetBody(buf.Bytes())
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} else {
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ctx.RequestCtx.SetBodyString(fmt.Sprintf("%v", r))
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}
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default:
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// Default string conversion
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ctx.RequestCtx.SetBodyString(fmt.Sprintf("%v", r))
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}
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return nil, nil
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}
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return result, err
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}
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