package stdlib
import (
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"github.com/d5/tengo"
"github.com/d5/tengo/objects"
)
var osModule = map[string]objects.Object{
"o_rdonly": &objects.Int{Value: int64(os.O_RDONLY)},
"o_wronly": &objects.Int{Value: int64(os.O_WRONLY)},
"o_rdwr": &objects.Int{Value: int64(os.O_RDWR)},
"o_append": &objects.Int{Value: int64(os.O_APPEND)},
"o_create": &objects.Int{Value: int64(os.O_CREATE)},
"o_excl": &objects.Int{Value: int64(os.O_EXCL)},
"o_sync": &objects.Int{Value: int64(os.O_SYNC)},
"o_trunc": &objects.Int{Value: int64(os.O_TRUNC)},
"mode_dir": &objects.Int{Value: int64(os.ModeDir)},
"mode_append": &objects.Int{Value: int64(os.ModeAppend)},
"mode_exclusive": &objects.Int{Value: int64(os.ModeExclusive)},
"mode_temporary": &objects.Int{Value: int64(os.ModeTemporary)},
"mode_symlink": &objects.Int{Value: int64(os.ModeSymlink)},
"mode_device": &objects.Int{Value: int64(os.ModeDevice)},
"mode_named_pipe": &objects.Int{Value: int64(os.ModeNamedPipe)},
"mode_socket": &objects.Int{Value: int64(os.ModeSocket)},
"mode_setuid": &objects.Int{Value: int64(os.ModeSetuid)},
"mode_setgui": &objects.Int{Value: int64(os.ModeSetgid)},
"mode_char_device": &objects.Int{Value: int64(os.ModeCharDevice)},
"mode_sticky": &objects.Int{Value: int64(os.ModeSticky)},
"mode_type": &objects.Int{Value: int64(os.ModeType)},
"mode_perm": &objects.Int{Value: int64(os.ModePerm)},
"path_separator": &objects.Char{Value: os.PathSeparator},
"path_list_separator": &objects.Char{Value: os.PathListSeparator},
"dev_null": &objects.String{Value: os.DevNull},
"seek_set": &objects.Int{Value: int64(io.SeekStart)},
"seek_cur": &objects.Int{Value: int64(io.SeekCurrent)},
"seek_end": &objects.Int{Value: int64(io.SeekEnd)},
"args": &objects.UserFunction{Name: "args", Value: osArgs}, // args() => array(string)
"chdir": &objects.UserFunction{Name: "chdir", Value: FuncASRE(os.Chdir)}, // chdir(dir string) => error
"chmod": osFuncASFmRE("chmod", os.Chmod), // chmod(name string, mode int) => error
"chown": &objects.UserFunction{Name: "chown", Value: FuncASIIRE(os.Chown)}, // chown(name string, uid int, gid int) => error
"clearenv": &objects.UserFunction{Name: "clearenv", Value: FuncAR(os.Clearenv)}, // clearenv()
"environ": &objects.UserFunction{Name: "environ", Value: FuncARSs(os.Environ)}, // environ() => array(string)
"exit": &objects.UserFunction{Name: "exit", Value: FuncAIR(os.Exit)}, // exit(code int)
"expand_env": &objects.UserFunction{Name: "expand_env", Value: osExpandEnv}, // expand_env(s string) => string
"getegid": &objects.UserFunction{Name: "getegid", Value: FuncARI(os.Getegid)}, // getegid() => int
"getenv": &objects.UserFunction{Name: "getenv", Value: FuncASRS(os.Getenv)}, // getenv(s string) => string
"geteuid": &objects.UserFunction{Name: "geteuid", Value: FuncARI(os.Geteuid)}, // geteuid() => int
"getgid": &objects.UserFunction{Name: "getgid", Value: FuncARI(os.Getgid)}, // getgid() => int
"getgroups": &objects.UserFunction{Name: "getgroups", Value: FuncARIsE(os.Getgroups)}, // getgroups() => array(string)/error
"getpagesize": &objects.UserFunction{Name: "getpagesize", Value: FuncARI(os.Getpagesize)}, // getpagesize() => int
"getpid": &objects.UserFunction{Name: "getpid", Value: FuncARI(os.Getpid)}, // getpid() => int
"getppid": &objects.UserFunction{Name: "getppid", Value: FuncARI(os.Getppid)}, // getppid() => int
"getuid": &objects.UserFunction{Name: "getuid", Value: FuncARI(os.Getuid)}, // getuid() => int
"getwd": &objects.UserFunction{Name: "getwd", Value: FuncARSE(os.Getwd)}, // getwd() => string/error
"hostname": &objects.UserFunction{Name: "hostname", Value: FuncARSE(os.Hostname)}, // hostname() => string/error
"lchown": &objects.UserFunction{Name: "lchown", Value: FuncASIIRE(os.Lchown)}, // lchown(name string, uid int, gid int) => error
"link": &objects.UserFunction{Name: "link", Value: FuncASSRE(os.Link)}, // link(oldname string, newname string) => error
"lookup_env": &objects.UserFunction{Name: "lookup_env", Value: osLookupEnv}, // lookup_env(key string) => string/false
"mkdir": osFuncASFmRE("mkdir", os.Mkdir), // mkdir(name string, perm int) => error
"mkdir_all": osFuncASFmRE("mkdir_all", os.MkdirAll), // mkdir_all(name string, perm int) => error
"readlink": &objects.UserFunction{Name: "readlink", Value: FuncASRSE(os.Readlink)}, // readlink(name string) => string/error
"remove": &objects.UserFunction{Name: "remove", Value: FuncASRE(os.Remove)}, // remove(name string) => error
"remove_all": &objects.UserFunction{Name: "remove_all", Value: FuncASRE(os.RemoveAll)}, // remove_all(name string) => error
"rename": &objects.UserFunction{Name: "rename", Value: FuncASSRE(os.Rename)}, // rename(oldpath string, newpath string) => error
"setenv": &objects.UserFunction{Name: "setenv", Value: FuncASSRE(os.Setenv)}, // setenv(key string, value string) => error
"symlink": &objects.UserFunction{Name: "symlink", Value: FuncASSRE(os.Symlink)}, // symlink(oldname string newname string) => error
"temp_dir": &objects.UserFunction{Name: "temp_dir", Value: FuncARS(os.TempDir)}, // temp_dir() => string
"truncate": &objects.UserFunction{Name: "truncate", Value: FuncASI64RE(os.Truncate)}, // truncate(name string, size int) => error
"unsetenv": &objects.UserFunction{Name: "unsetenv", Value: FuncASRE(os.Unsetenv)}, // unsetenv(key string) => error
"create": &objects.UserFunction{Name: "create", Value: osCreate}, // create(name string) => imap(file)/error
"open": &objects.UserFunction{Name: "open", Value: osOpen}, // open(name string) => imap(file)/error
"open_file": &objects.UserFunction{Name: "open_file", Value: osOpenFile}, // open_file(name string, flag int, perm int) => imap(file)/error
"find_process": &objects.UserFunction{Name: "find_process", Value: osFindProcess}, // find_process(pid int) => imap(process)/error
"start_process": &objects.UserFunction{Name: "start_process", Value: osStartProcess}, // start_process(name string, argv array(string), dir string, env array(string)) => imap(process)/error
"exec_look_path": &objects.UserFunction{Name: "exec_look_path", Value: FuncASRSE(exec.LookPath)}, // exec_look_path(file) => string/error
"exec": &objects.UserFunction{Name: "exec", Value: osExec}, // exec(name, args...) => command
"stat": &objects.UserFunction{Name: "stat", Value: osStat}, // stat(name) => imap(fileinfo)/error
"read_file": &objects.UserFunction{Name: "read_file", Value: osReadFile}, // readfile(name) => array(byte)/error
}
func osReadFile(args ...objects.Object) (ret objects.Object, err error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
fname, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
bytes, err := ioutil.ReadFile(fname)
if err != nil {
return wrapError(err), nil
}
if len(bytes) > tengo.MaxBytesLen {
return nil, objects.ErrBytesLimit
}
return &objects.Bytes{Value: bytes}, nil
}
func osStat(args ...objects.Object) (ret objects.Object, err error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
fname, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
stat, err := os.Stat(fname)
if err != nil {
return wrapError(err), nil
}
fstat := &objects.ImmutableMap{
Value: map[string]objects.Object{
"name": &objects.String{Value: stat.Name()},
"mtime": &objects.Time{Value: stat.ModTime()},
"size": &objects.Int{Value: stat.Size()},
"mode": &objects.Int{Value: int64(stat.Mode())},
},
}
if stat.IsDir() {
fstat.Value["directory"] = objects.TrueValue
} else {
fstat.Value["directory"] = objects.FalseValue
}
return fstat, nil
}
func osCreate(args ...objects.Object) (objects.Object, error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
res, err := os.Create(s1)
if err != nil {
return wrapError(err), nil
}
return makeOSFile(res), nil
}
func osOpen(args ...objects.Object) (objects.Object, error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
res, err := os.Open(s1)
if err != nil {
return wrapError(err), nil
}
return makeOSFile(res), nil
}
func osOpenFile(args ...objects.Object) (objects.Object, error) {
if len(args) != 3 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
i2, ok := objects.ToInt(args[1])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
}
i3, ok := objects.ToInt(args[2])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "third",
Expected: "int(compatible)",
Found: args[2].TypeName(),
}
}
res, err := os.OpenFile(s1, i2, os.FileMode(i3))
if err != nil {
return wrapError(err), nil
}
return makeOSFile(res), nil
}
func osArgs(args ...objects.Object) (objects.Object, error) {
if len(args) != 0 {
return nil, objects.ErrWrongNumArguments
}
arr := &objects.Array{}
for _, osArg := range os.Args {
if len(osArg) > tengo.MaxStringLen {
return nil, objects.ErrStringLimit
}
arr.Value = append(arr.Value, &objects.String{Value: osArg})
}
return arr, nil
}
func osFuncASFmRE(name string, fn func(string, os.FileMode) error) *objects.UserFunction {
return &objects.UserFunction{
Name: name,
Value: func(args ...objects.Object) (objects.Object, error) {
if len(args) != 2 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
i2, ok := objects.ToInt64(args[1])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "second",
Expected: "int(compatible)",
Found: args[1].TypeName(),
}
}
return wrapError(fn(s1, os.FileMode(i2))), nil
},
}
}
func osLookupEnv(args ...objects.Object) (objects.Object, error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
res, ok := os.LookupEnv(s1)
if !ok {
return objects.FalseValue, nil
}
if len(res) > tengo.MaxStringLen {
return nil, objects.ErrStringLimit
}
return &objects.String{Value: res}, nil
}
func osExpandEnv(args ...objects.Object) (objects.Object, error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
s1, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
var vlen int
var failed bool
s := os.Expand(s1, func(k string) string {
if failed {
return ""
}
v := os.Getenv(k)
// this does not count the other texts that are not being replaced
// but the code checks the final length at the end
vlen += len(v)
if vlen > tengo.MaxStringLen {
failed = true
return ""
}
return v
})
if failed || len(s) > tengo.MaxStringLen {
return nil, objects.ErrStringLimit
}
return &objects.String{Value: s}, nil
}
func osExec(args ...objects.Object) (objects.Object, error) {
if len(args) == 0 {
return nil, objects.ErrWrongNumArguments
}
name, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
var execArgs []string
for idx, arg := range args[1:] {
execArg, ok := objects.ToString(arg)
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: fmt.Sprintf("args[%d]", idx),
Expected: "string(compatible)",
Found: args[1+idx].TypeName(),
}
}
execArgs = append(execArgs, execArg)
}
return makeOSExecCommand(exec.Command(name, execArgs...)), nil
}
func osFindProcess(args ...objects.Object) (objects.Object, error) {
if len(args) != 1 {
return nil, objects.ErrWrongNumArguments
}
i1, ok := objects.ToInt(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "int(compatible)",
Found: args[0].TypeName(),
}
}
proc, err := os.FindProcess(i1)
if err != nil {
return wrapError(err), nil
}
return makeOSProcess(proc), nil
}
func osStartProcess(args ...objects.Object) (objects.Object, error) {
if len(args) != 4 {
return nil, objects.ErrWrongNumArguments
}
name, ok := objects.ToString(args[0])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "first",
Expected: "string(compatible)",
Found: args[0].TypeName(),
}
}
var argv []string
var err error
switch arg1 := args[1].(type) {
case *objects.Array:
argv, err = stringArray(arg1.Value, "second")
if err != nil {
return nil, err
}
case *objects.ImmutableArray:
argv, err = stringArray(arg1.Value, "second")
if err != nil {
return nil, err
}
default:
return nil, objects.ErrInvalidArgumentType{
Name: "second",
Expected: "array",
Found: arg1.TypeName(),
}
}
dir, ok := objects.ToString(args[2])
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: "third",
Expected: "string(compatible)",
Found: args[2].TypeName(),
}
}
var env []string
switch arg3 := args[3].(type) {
case *objects.Array:
env, err = stringArray(arg3.Value, "fourth")
if err != nil {
return nil, err
}
case *objects.ImmutableArray:
env, err = stringArray(arg3.Value, "fourth")
if err != nil {
return nil, err
}
default:
return nil, objects.ErrInvalidArgumentType{
Name: "fourth",
Expected: "array",
Found: arg3.TypeName(),
}
}
proc, err := os.StartProcess(name, argv, &os.ProcAttr{
Dir: dir,
Env: env,
})
if err != nil {
return wrapError(err), nil
}
return makeOSProcess(proc), nil
}
func stringArray(arr []objects.Object, argName string) ([]string, error) {
var sarr []string
for idx, elem := range arr {
str, ok := elem.(*objects.String)
if !ok {
return nil, objects.ErrInvalidArgumentType{
Name: fmt.Sprintf("%s[%d]", argName, idx),
Expected: "string",
Found: elem.TypeName(),
}
}
sarr = append(sarr, str.Value)
}
return sarr, nil
}