427 lines
10 KiB
Go
427 lines
10 KiB
Go
package dbus
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"reflect"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
byteType = reflect.TypeOf(byte(0))
|
|
boolType = reflect.TypeOf(false)
|
|
uint8Type = reflect.TypeOf(uint8(0))
|
|
int16Type = reflect.TypeOf(int16(0))
|
|
uint16Type = reflect.TypeOf(uint16(0))
|
|
intType = reflect.TypeOf(int(0))
|
|
uintType = reflect.TypeOf(uint(0))
|
|
int32Type = reflect.TypeOf(int32(0))
|
|
uint32Type = reflect.TypeOf(uint32(0))
|
|
int64Type = reflect.TypeOf(int64(0))
|
|
uint64Type = reflect.TypeOf(uint64(0))
|
|
float64Type = reflect.TypeOf(float64(0))
|
|
stringType = reflect.TypeOf("")
|
|
signatureType = reflect.TypeOf(Signature{""})
|
|
objectPathType = reflect.TypeOf(ObjectPath(""))
|
|
variantType = reflect.TypeOf(Variant{Signature{""}, nil})
|
|
interfacesType = reflect.TypeOf([]interface{}{})
|
|
interfaceType = reflect.TypeOf((*interface{})(nil)).Elem()
|
|
unixFDType = reflect.TypeOf(UnixFD(0))
|
|
unixFDIndexType = reflect.TypeOf(UnixFDIndex(0))
|
|
)
|
|
|
|
// An InvalidTypeError signals that a value which cannot be represented in the
|
|
// D-Bus wire format was passed to a function.
|
|
type InvalidTypeError struct {
|
|
Type reflect.Type
|
|
}
|
|
|
|
func (e InvalidTypeError) Error() string {
|
|
return "dbus: invalid type " + e.Type.String()
|
|
}
|
|
|
|
// Store copies the values contained in src to dest, which must be a slice of
|
|
// pointers. It converts slices of interfaces from src to corresponding structs
|
|
// in dest. An error is returned if the lengths of src and dest or the types of
|
|
// their elements don't match.
|
|
func Store(src []interface{}, dest ...interface{}) error {
|
|
if len(src) != len(dest) {
|
|
return errors.New("dbus.Store: length mismatch")
|
|
}
|
|
|
|
for i := range src {
|
|
if err := storeInterfaces(src[i], dest[i]); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func storeInterfaces(src, dest interface{}) error {
|
|
return store(reflect.ValueOf(dest), reflect.ValueOf(src))
|
|
}
|
|
|
|
func store(dest, src reflect.Value) error {
|
|
if dest.Kind() == reflect.Ptr {
|
|
return store(dest.Elem(), src)
|
|
}
|
|
switch src.Kind() {
|
|
case reflect.Slice:
|
|
return storeSlice(dest, src)
|
|
case reflect.Map:
|
|
return storeMap(dest, src)
|
|
default:
|
|
return storeBase(dest, src)
|
|
}
|
|
}
|
|
|
|
func storeBase(dest, src reflect.Value) error {
|
|
return setDest(dest, src)
|
|
}
|
|
|
|
func setDest(dest, src reflect.Value) error {
|
|
if !isVariant(src.Type()) && isVariant(dest.Type()) {
|
|
//special conversion for dbus.Variant
|
|
dest.Set(reflect.ValueOf(MakeVariant(src.Interface())))
|
|
return nil
|
|
}
|
|
if isVariant(src.Type()) && !isVariant(dest.Type()) {
|
|
src = getVariantValue(src)
|
|
}
|
|
if !src.Type().ConvertibleTo(dest.Type()) {
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: cannot convert %s to %s",
|
|
src.Type(), dest.Type())
|
|
}
|
|
dest.Set(src.Convert(dest.Type()))
|
|
return nil
|
|
}
|
|
|
|
func kindsAreCompatible(dest, src reflect.Type) bool {
|
|
switch {
|
|
case isVariant(dest):
|
|
return true
|
|
case dest.Kind() == reflect.Interface:
|
|
return true
|
|
default:
|
|
return dest.Kind() == src.Kind()
|
|
}
|
|
}
|
|
|
|
func isConvertibleTo(dest, src reflect.Type) bool {
|
|
switch {
|
|
case isVariant(dest):
|
|
return true
|
|
case dest.Kind() == reflect.Interface:
|
|
return true
|
|
case dest.Kind() == reflect.Slice:
|
|
return src.Kind() == reflect.Slice &&
|
|
isConvertibleTo(dest.Elem(), src.Elem())
|
|
case dest.Kind() == reflect.Struct:
|
|
return src == interfacesType
|
|
default:
|
|
return src.ConvertibleTo(dest)
|
|
}
|
|
}
|
|
|
|
func storeMap(dest, src reflect.Value) error {
|
|
switch {
|
|
case !kindsAreCompatible(dest.Type(), src.Type()):
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"map: cannot store a value of %s into %s",
|
|
src.Type(), dest.Type())
|
|
case isVariant(dest.Type()):
|
|
return storeMapIntoVariant(dest, src)
|
|
case dest.Kind() == reflect.Interface:
|
|
return storeMapIntoInterface(dest, src)
|
|
case isConvertibleTo(dest.Type().Key(), src.Type().Key()) &&
|
|
isConvertibleTo(dest.Type().Elem(), src.Type().Elem()):
|
|
return storeMapIntoMap(dest, src)
|
|
default:
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"map: cannot convert a value of %s into %s",
|
|
src.Type(), dest.Type())
|
|
}
|
|
}
|
|
|
|
func storeMapIntoVariant(dest, src reflect.Value) error {
|
|
dv := reflect.MakeMap(src.Type())
|
|
err := store(dv, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return storeBase(dest, dv)
|
|
}
|
|
|
|
func storeMapIntoInterface(dest, src reflect.Value) error {
|
|
var dv reflect.Value
|
|
if isVariant(src.Type().Elem()) {
|
|
//Convert variants to interface{} recursively when converting
|
|
//to interface{}
|
|
dv = reflect.MakeMap(
|
|
reflect.MapOf(src.Type().Key(), interfaceType))
|
|
} else {
|
|
dv = reflect.MakeMap(src.Type())
|
|
}
|
|
err := store(dv, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return storeBase(dest, dv)
|
|
}
|
|
|
|
func storeMapIntoMap(dest, src reflect.Value) error {
|
|
if dest.IsNil() {
|
|
dest.Set(reflect.MakeMap(dest.Type()))
|
|
}
|
|
keys := src.MapKeys()
|
|
for _, key := range keys {
|
|
dkey := key.Convert(dest.Type().Key())
|
|
dval := reflect.New(dest.Type().Elem()).Elem()
|
|
err := store(dval, getVariantValue(src.MapIndex(key)))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dest.SetMapIndex(dkey, dval)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func storeSlice(dest, src reflect.Value) error {
|
|
switch {
|
|
case src.Type() == interfacesType && dest.Kind() == reflect.Struct:
|
|
//The decoder always decodes structs as slices of interface{}
|
|
return storeStruct(dest, src)
|
|
case !kindsAreCompatible(dest.Type(), src.Type()):
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"slice: cannot store a value of %s into %s",
|
|
src.Type(), dest.Type())
|
|
case isVariant(dest.Type()):
|
|
return storeSliceIntoVariant(dest, src)
|
|
case dest.Kind() == reflect.Interface:
|
|
return storeSliceIntoInterface(dest, src)
|
|
case isConvertibleTo(dest.Type().Elem(), src.Type().Elem()):
|
|
return storeSliceIntoSlice(dest, src)
|
|
default:
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"slice: cannot convert a value of %s into %s",
|
|
src.Type(), dest.Type())
|
|
}
|
|
}
|
|
|
|
func storeStruct(dest, src reflect.Value) error {
|
|
if isVariant(dest.Type()) {
|
|
return storeBase(dest, src)
|
|
}
|
|
dval := make([]interface{}, 0, dest.NumField())
|
|
dtype := dest.Type()
|
|
for i := 0; i < dest.NumField(); i++ {
|
|
field := dest.Field(i)
|
|
ftype := dtype.Field(i)
|
|
if ftype.PkgPath != "" {
|
|
continue
|
|
}
|
|
if ftype.Tag.Get("dbus") == "-" {
|
|
continue
|
|
}
|
|
dval = append(dval, field.Addr().Interface())
|
|
}
|
|
if src.Len() != len(dval) {
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"destination struct does not have "+
|
|
"enough fields need: %d have: %d",
|
|
src.Len(), len(dval))
|
|
}
|
|
return Store(src.Interface().([]interface{}), dval...)
|
|
}
|
|
|
|
func storeSliceIntoVariant(dest, src reflect.Value) error {
|
|
dv := reflect.MakeSlice(src.Type(), src.Len(), src.Cap())
|
|
err := store(dv, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return storeBase(dest, dv)
|
|
}
|
|
|
|
func storeSliceIntoInterface(dest, src reflect.Value) error {
|
|
var dv reflect.Value
|
|
if isVariant(src.Type().Elem()) {
|
|
//Convert variants to interface{} recursively when converting
|
|
//to interface{}
|
|
dv = reflect.MakeSlice(reflect.SliceOf(interfaceType),
|
|
src.Len(), src.Cap())
|
|
} else {
|
|
dv = reflect.MakeSlice(src.Type(), src.Len(), src.Cap())
|
|
}
|
|
err := store(dv, src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return storeBase(dest, dv)
|
|
}
|
|
|
|
func storeSliceIntoSlice(dest, src reflect.Value) error {
|
|
if dest.IsNil() || dest.Len() < src.Len() {
|
|
dest.Set(reflect.MakeSlice(dest.Type(), src.Len(), src.Cap()))
|
|
}
|
|
if dest.Len() != src.Len() {
|
|
return fmt.Errorf(
|
|
"dbus.Store: type mismatch: "+
|
|
"slices are different lengths "+
|
|
"need: %d have: %d",
|
|
src.Len(), dest.Len())
|
|
}
|
|
for i := 0; i < src.Len(); i++ {
|
|
err := store(dest.Index(i), getVariantValue(src.Index(i)))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func getVariantValue(in reflect.Value) reflect.Value {
|
|
if isVariant(in.Type()) {
|
|
return reflect.ValueOf(in.Interface().(Variant).Value())
|
|
}
|
|
return in
|
|
}
|
|
|
|
func isVariant(t reflect.Type) bool {
|
|
return t == variantType
|
|
}
|
|
|
|
// An ObjectPath is an object path as defined by the D-Bus spec.
|
|
type ObjectPath string
|
|
|
|
// IsValid returns whether the object path is valid.
|
|
func (o ObjectPath) IsValid() bool {
|
|
s := string(o)
|
|
if len(s) == 0 {
|
|
return false
|
|
}
|
|
if s[0] != '/' {
|
|
return false
|
|
}
|
|
if s[len(s)-1] == '/' && len(s) != 1 {
|
|
return false
|
|
}
|
|
// probably not used, but technically possible
|
|
if s == "/" {
|
|
return true
|
|
}
|
|
split := strings.Split(s[1:], "/")
|
|
for _, v := range split {
|
|
if len(v) == 0 {
|
|
return false
|
|
}
|
|
for _, c := range v {
|
|
if !isMemberChar(c) {
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// A UnixFD is a Unix file descriptor sent over the wire. See the package-level
|
|
// documentation for more information about Unix file descriptor passsing.
|
|
type UnixFD int32
|
|
|
|
// A UnixFDIndex is the representation of a Unix file descriptor in a message.
|
|
type UnixFDIndex uint32
|
|
|
|
// alignment returns the alignment of values of type t.
|
|
func alignment(t reflect.Type) int {
|
|
switch t {
|
|
case variantType:
|
|
return 1
|
|
case objectPathType:
|
|
return 4
|
|
case signatureType:
|
|
return 1
|
|
case interfacesType:
|
|
return 4
|
|
}
|
|
switch t.Kind() {
|
|
case reflect.Uint8:
|
|
return 1
|
|
case reflect.Uint16, reflect.Int16:
|
|
return 2
|
|
case reflect.Uint, reflect.Int, reflect.Uint32, reflect.Int32, reflect.String, reflect.Array, reflect.Slice, reflect.Map:
|
|
return 4
|
|
case reflect.Uint64, reflect.Int64, reflect.Float64, reflect.Struct:
|
|
return 8
|
|
case reflect.Ptr:
|
|
return alignment(t.Elem())
|
|
}
|
|
return 1
|
|
}
|
|
|
|
// isKeyType returns whether t is a valid type for a D-Bus dict.
|
|
func isKeyType(t reflect.Type) bool {
|
|
switch t.Kind() {
|
|
case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
|
|
reflect.Int16, reflect.Int32, reflect.Int64, reflect.Float64,
|
|
reflect.String, reflect.Uint, reflect.Int:
|
|
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// isValidInterface returns whether s is a valid name for an interface.
|
|
func isValidInterface(s string) bool {
|
|
if len(s) == 0 || len(s) > 255 || s[0] == '.' {
|
|
return false
|
|
}
|
|
elem := strings.Split(s, ".")
|
|
if len(elem) < 2 {
|
|
return false
|
|
}
|
|
for _, v := range elem {
|
|
if len(v) == 0 {
|
|
return false
|
|
}
|
|
if v[0] >= '0' && v[0] <= '9' {
|
|
return false
|
|
}
|
|
for _, c := range v {
|
|
if !isMemberChar(c) {
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// isValidMember returns whether s is a valid name for a member.
|
|
func isValidMember(s string) bool {
|
|
if len(s) == 0 || len(s) > 255 {
|
|
return false
|
|
}
|
|
i := strings.Index(s, ".")
|
|
if i != -1 {
|
|
return false
|
|
}
|
|
if s[0] >= '0' && s[0] <= '9' {
|
|
return false
|
|
}
|
|
for _, c := range s {
|
|
if !isMemberChar(c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func isMemberChar(c rune) bool {
|
|
return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') ||
|
|
(c >= 'a' && c <= 'z') || c == '_'
|
|
}
|