// Make functions related to server configuration and permissions available
func exportServerConfigFunctions(L *lua.LState, perm pinterface.IPermissions, filename string, luapool *lStatePool) {
// Set a default host and port. Maybe useful for alg applications.
L.SetGlobal("SetAddr", L.NewFunction(func(L *lua.LState) int {
serverAddrLua = L.ToString(1)
return 0 // number of results
}))
// Clear the default path prefixes. This makes everything public.
L.SetGlobal("ClearPermissions", L.NewFunction(func(L *lua.LState) int {
perm.Clear()
return 0 // number of results
}))
// Registers a path prefix, for instance "/secret",
// as having *user* rights.
L.SetGlobal("AddUserPrefix", L.NewFunction(func(L *lua.LState) int {
path := L.ToString(1)
perm.AddUserPath(path)
return 0 // number of results
}))
// Registers a path prefix, for instance "/secret",
// as having *admin* rights.
L.SetGlobal("AddAdminPrefix", L.NewFunction(func(L *lua.LState) int {
path := L.ToString(1)
perm.AddAdminPath(path)
return 0 // number of results
}))
// Sets a Lua function as a custom "permissions denied" page handler.
L.SetGlobal("DenyHandler", L.NewFunction(func(L *lua.LState) int {
luaDenyFunc := L.ToFunction(1)
// Custom handler for when permissions are denied
perm.SetDenyFunction(func(w http.ResponseWriter, req *http.Request) {
// Set up a new Lua state with the current http.ResponseWriter and *http.Request, without caching
exportCommonFunctions(w, req, filename, perm, L, luapool, nil, nil)
// Then run the given Lua function
L.Push(luaDenyFunc)
if err := L.PCall(0, lua.MultRet, nil); err != nil {
// Non-fatal error
log.Error("Permission denied handler failed:", err)
// Use the default permission handler from now on if the lua function fails
perm.SetDenyFunction(permissions.PermissionDenied)
perm.DenyFunction()(w, req)
}
})
return 0 // number of results
}))
// Sets a Lua function to be run once the server is done parsing configuration and arguments.
L.SetGlobal("OnReady", L.NewFunction(func(L *lua.LState) int {
luaReadyFunc := L.ToFunction(1)
// Custom handler for when permissions are denied.
// Put the *lua.LState in a closure.
serverReadyFunctionLua = func() {
// Run the given Lua function
L.Push(luaReadyFunc)
if err := L.PCall(0, lua.MultRet, nil); err != nil {
// Non-fatal error
log.Error("The OnReady function failed:", err)
}
}
return 0 // number of results
}))
// Set a access log filename. If blank, the log will go to the console (or browser, if debug mode is set).
L.SetGlobal("LogTo", L.NewFunction(func(L *lua.LState) int {
filename := L.ToString(1)
serverLogFile = filename
// Log as JSON by default
log.SetFormatter(&log.JSONFormatter{})
// Log to stderr if an empty filename is given
if filename == "" {
log.SetOutput(os.Stderr)
L.Push(lua.LBool(true))
return 1 // number of results
}
// Try opening/creating the given filename, for appending
f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_APPEND, defaultPermissions)
if err != nil {
log.Error(err)
L.Push(lua.LBool(false))
return 1 // number of results
}
// Set the file to log to and return
log.SetOutput(f)
L.Push(lua.LBool(true))
return 1 // number of results
}))
// Use a single Lua file as the server, instead of directory structure
L.SetGlobal("ServerFile", L.NewFunction(func(L *lua.LState) int {
givenFilename := L.ToString(1)
serverfilename := filepath.Join(filepath.Dir(filename), givenFilename)
if !fs.exists(filename) {
log.Error("Could not find", serverfilename)
L.Push(lua.LBool(false))
return 1 // number of results
}
luaServerFilename = serverfilename
L.Push(lua.LBool(true))
return 1 // number of results
}))
L.SetGlobal("ServerInfo", L.NewFunction(func(L *lua.LState) int {
// Return the string, but drop the final newline
L.Push(lua.LString(serverInfo()))
return 1 // number of results
}))
}
