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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package basicstation
import (
"fmt"
"regexp"
"strconv"
"strings"
"go.thethings.network/lorawan-stack/pkg/errors"
"go.thethings.network/lorawan-stack/pkg/types"
)
// EUI is an EUI that can be marshaled to an ID6 string and unmarshaled from a ID6 or hex string.
type EUI struct {
types.EUI64
Prefix string
}
// MarshalJSON implements json.Marshaler.
func (eui EUI) MarshalJSON() ([]byte, error) {
var res string
if eui.Prefix != "" {
res += strings.ToLower(eui.Prefix) + "-"
}
if eui.EUI64[0] != 0 || eui.EUI64[1] != 0 {
res += fmt.Sprintf("%x:", uint16(eui.EUI64[0])<<8|uint16(eui.EUI64[1]))
}
for _, g := range []uint16{
uint16(eui.EUI64[2])<<8 | uint16(eui.EUI64[3]),
uint16(eui.EUI64[4])<<8 | uint16(eui.EUI64[5]),
} {
if g != 0 {
res += fmt.Sprintf("%x", g)
}
res += ":"
}
res += fmt.Sprintf("%x", uint16(eui.EUI64[6])<<8|uint16(eui.EUI64[7]))
return []byte(`"` + res + `"`), nil
}
var (
hexPatternWithDashes = regexp.MustCompile(`^"([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})-([a-fA-F0-9]{2})"$`)
hexPatternWithColons = regexp.MustCompile(`^"([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2}):([a-fA-F0-9]{2})"$`)
id6Pattern = regexp.MustCompile(`^"(?:([a-z]+)-)?(?:([a-f0-9]{0,4}):)?([a-f0-9]{0,4}):([a-f0-9]{0,4}):([a-f0-9]{0,4})"$`)
)
var errFormat = errors.DefineInvalidArgument("format", "invalid format")
// UnmarshalJSON implements json.Unmarshaler.
func (eui *EUI) UnmarshalJSON(data []byte) error {
if bytes := hexPatternWithDashes.FindStringSubmatch(string(data)); bytes != nil {
for i, b := range bytes[1:] {
v, err := strconv.ParseUint(b, 16, 8)
if err != nil {
return errFormat.WithCause(err)
}
eui.EUI64[i] = uint8(v)
}
return nil
}
if bytes := hexPatternWithColons.FindStringSubmatch(string(data)); bytes != nil {
for i, b := range bytes[1:] {
v, err := strconv.ParseUint(b, 16, 8)
if err != nil {
return errFormat.WithCause(err)
}
eui.EUI64[i] = uint8(v)
}
return nil
}
if bytes := id6Pattern.FindStringSubmatch(string(data)); bytes != nil {
eui.Prefix = bytes[1]
for i, b := range bytes[2:] {
if b == "" {
b = "0"
}
v, err := strconv.ParseUint(b, 16, 16)
if err != nil {
return errFormat.WithCause(err)
}
eui.EUI64[2*i] = uint8(v >> 8)
eui.EUI64[2*i+1] = uint8(v)
}
return nil
}
return errFormat
}