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commissionee.go
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commissionee.go
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// Copyright (C) 2024 Satoshi Konno. All rights reserved.
//
// 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 matter
import (
_ "embed"
"strings"
"github.com/cybergarage/go-mdns/mdns"
"github.com/cybergarage/go-mdns/mdns/dns"
)
// Commissionee represents a commissionee.
type Commissionee struct {
*mdns.Service
}
// NewCommissioneeWithMessage returns a new commissionee with a mDNS message.
func NewCommissioneeWithMessage(msg *dns.Message) (*Commissionee, error) {
service, err := mdns.NewServiceWithMessage(msg)
if err != nil {
return nil, err
}
return NewCommissioneeWithService(service), nil
}
// NewCommissioneeWithService returns a new commissionee with a mDNS service.
func NewCommissioneeWithService(service *mdns.Service) *Commissionee {
com := &Commissionee{
Service: service,
}
return com
}
// LookupSubtype returns a subtype for the specified prefix.
func (com *Commissionee) LookupSubtype(prefix string) (string, bool) {
record, ok := com.Service.LookupResourceRecordForNamePrefix(prefix)
if !ok {
return "", false
}
names := strings.Split(record.Name(), ".")
if len(names) < 1 {
return "", false
}
return names[0][len(prefix):], true
}
// LookupAttribute returns an attribute value for the specified name.
func (com *Commissionee) LookupAttribute(name string) (string, bool) {
attr, ok := com.Service.LookupAttribute(name)
if !ok {
return "", false
}
return attr.Value(), true
}
func (com *Commissionee) appendLookupSubtype(records []string, name string) []string {
v, ok := com.LookupSubtype(name)
if !ok {
return records
}
return append(records, v)
}
func (com *Commissionee) appendLookupAttribute(records []string, name string) []string {
v, ok := com.LookupAttribute(name)
if !ok {
return records
}
return append(records, v)
}
// 4.3.1.3. Commissioning Subtypes (_L,_S)
// 4.3.1.5. TXT key for discriminator (D)
// LookupDiscriminator returns a discriminator.
func (com *Commissionee) LookupDiscriminator() (string, bool) {
d, ok := com.LookupFullDiscriminator()
if ok {
return d, true
}
return com.LookupShortDiscriminator()
}
// 4.3.1.3. Commissioning Subtypes (_L)
// LookupDiscriminator returns a full 12-bit discriminator.
func (com *Commissionee) LookupFullDiscriminator() (string, bool) {
d, ok := com.LookupAttribute(TxtRecordDiscriminator)
if ok {
return d, true
}
d, ok = com.LookupSubtype(SubtypeDiscriminatorLong)
if ok {
return d, true
}
return com.LookupSubtype(SubtypeDiscriminatorShort)
}
// 4.3.1.3. Commissioning Subtypes (_S)
// LookupShortDiscriminator returns a short 4-bit discriminator.
func (com *Commissionee) LookupShortDiscriminator() (string, bool) {
return com.LookupSubtype(SubtypeDiscriminatorShort)
}
// 4.3.1.3. Commissioning Subtypes (_V)
// 4.3.1.6. TXT key for Vendor ID and Product ID (VP)
// LookupVendorID returns a vendor and product ID.
func (com *Commissionee) LookupVendorID() (string, bool) {
venderID, _, ok := com.LookupVendorProductID()
if ok {
return venderID, true
}
return com.LookupSubtype(SubtypeVendorID)
}
// 4.3.1.6. TXT key for Vendor ID and Product ID (VP)
// LookupVendorProductID returns a vendor and product ID.
func (com *Commissionee) LookupVendorProductID() (string, string, bool) {
splitVenderProductID := func(vp string) (string, string, bool) {
vpList := strings.Split(vp, "+")
if len(vpList) < 1 {
return vpList[0], "", true
}
return vpList[0], vpList[1], true
}
vp, ok := com.LookupAttribute(TxtRecordVendorProductID)
if !ok || len(vp) == 0 {
return "", "", false
}
return splitVenderProductID(vp)
}
// 4.3.1.3. Commissioning Subtypes (_CM)
// 4.3.1.7. TXT key for commissioning mode (CM)
// LookupCommissioningMode returns a commissioning mode.
func (com *Commissionee) LookupCommissioningMode() (string, bool) {
cmFrom := func(cms string) (string, bool) {
if len(cms) == 0 {
return CommissioningModeNone, true
}
return cms, true
}
var records []string
records = com.appendLookupAttribute(records, TxtRecordCommissioningMode)
records = com.appendLookupSubtype(records, SubtypeCommissioningMode)
for _, cms := range records {
cm, ok := cmFrom(cms)
if ok {
return cm, true
}
}
return CommissioningModeNone, false
}
// 4.3.1.3. Commissioning Subtypes (_T)
// 4.3.1.8. TXT key for device type (DT)
// LookupDeviceType returns a device type.
func (com *Commissionee) LookupDeviceType() (DeviceType, bool) {
deviceTypeFrom := func(dts string) (DeviceType, bool) {
dt, err := NewDeviceTypeFromString(dts)
if err != nil {
return DeviceTypeUnknown, false
}
return dt, true
}
var records []string
records = com.appendLookupAttribute(records, TxtRecordDeviceType)
records = com.appendLookupSubtype(records, SubtypeDeviceType)
for _, dts := range records {
dt, ok := deviceTypeFrom(dts)
if ok {
return dt, true
}
}
return DeviceTypeUnknown, false
}
// 4.3.1.9. TXT key for device name (DN)
// LookupDeviceName returns a device name.
func (com *Commissionee) LookupDeviceName() (string, bool) {
return com.LookupAttribute(TxtRecordDeviceName)
}
// 4.3.1.10. TXT key for rotating device identifier (RI)
// LookupRotatingDeviceID returns a rotating device identifier.
func (com *Commissionee) LookupRotatingDeviceID() (string, bool) {
return com.LookupAttribute(TxtRecordRotatingDeviceID)
}
// 4.3.1.11. TXT key for pairing hint (PH)
// LookupPairingHint returns a pairing hint.
func (com *Commissionee) LookupPairingHint() (PairingHint, bool) {
phs, ok := com.LookupAttribute(TxtRecordPairingHint)
if !ok {
return PairingHintNone, false
}
ph, err := NewPairingHintFromString(phs)
if err != nil {
return PairingHintNone, false
}
return ph, true
}
// 4.3.1.12. TXT key for pairing instructions (PI)
// LookupPairingInstructions returns a pairing instructions.
func (com *Commissionee) LookupPairingInstructions() (string, bool) {
return com.LookupAttribute(TxtRecordPairingInstruction)
}