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tplink.go
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tplink.go
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package tplink
// Credit to:
// sausheong https://github.com/sausheong/hs1xxplug
// jaedle https://github.com/jaedle/golang-tplink-hs100
// nik-johnson-net https://github.com/nik-johnson-net/go-smarthome
import (
"fmt"
"io"
"log"
"net"
"time"
"encoding/binary"
"encoding/json"
)
// This is the key by which all bytes sent/received from tp-link hardware are
// obfuscated.
const hashKey byte = 0xAB
const frameHeaderSize = 4
const frameMaxSize = 1 << 30
// SysInfo A type used to return information from tplink devices
type SysInfo struct {
System struct {
GetSysinfo struct {
SwVer string `json:"sw_ver"`
HwVer string `json:"hw_ver"`
Type string `json:"type"`
Model string `json:"model"`
Mac string `json:"mac"`
DevName string `json:"dev_name"`
Alias string `json:"alias"`
RelayState int `json:"relay_state"`
OnTime int `json:"on_time"`
ActiveMode string `json:"active_mode"`
Feature string `json:"feature"`
Updating int `json:"updating"`
IconHash string `json:"icon_hash"`
Rssi int `json:"rssi"`
LedOff int `json:"led_off"`
LongitudeI int `json:"longitude_i"`
LatitudeI int `json:"latitude_i"`
HwID string `json:"hwId"`
FwID string `json:"fwId"`
DeviceID string `json:"deviceId"`
OemID string `json:"oemId"`
Children []struct {
ID string `json:"id"`
State int `json:"state"`
Alias string `json:"alias"`
OnTime int `json:"on_time"`
NextAction struct {
Type int `json:"type"`
} `json:"next_action"`
} `json:"children"`
ChildNum int `json:"child_num"`
NtcState int `json:"ntc_state"`
NextAction struct {
Type int `json:"type"`
} `json:"next_action"`
ErrCode int `json:"err_code"`
MicType string `json:"mic_type"`
Latitude float64 `json:"latitude"`
Longitude float64 `json:"longitude"`
} `json:"get_sysinfo"`
} `json:"system"`
Emeter struct {
GetRealtime struct {
CurrentMa int `json:"current_ma"`
VoltageMv int `json:"voltage_mv"`
PowerMw int `json:"power_mw"`
TotalWh int `json:"total_wh"`
ErrCode int `json:"err_code"`
} `json:"get_realtime"`
GetVgainIgain struct {
Vgain int `json:"vgain"`
Igain int `json:"igain"`
ErrCode int `json:"err_code"`
} `json:"get_vgain_igain"`
GetDaystat struct {
DayList []struct {
Year int `json:"year"`
Month int `json:"month"`
Day int `json:"day"`
EnergyWh int `json:"energy_wh"`
} `json:"day_list"`
ErrCode int `json:"err_code"`
} `json:"get_daystat"`
} `json:"emeter"`
}
// Tplink Device host identification
type Tplink struct {
Host string
SwitchID int
}
type getSysInfo struct {
System struct {
SysInfo struct {
} `json:"get_sysinfo"`
} `json:"system"`
}
type changeState struct {
System struct {
SetRelayState struct {
State int `json:"state"`
} `json:"set_relay_state"`
} `json:"system"`
}
type changeStateMultiSwitch struct {
Context struct {
ChildIds []string `json:"child_ids"`
} `json:"context"`
System struct {
SetRelayState struct {
State int `json:"state"`
} `json:"set_relay_state"`
} `json:"system"`
}
type meterInfo struct {
System struct {
GetSysinfo struct{} `json:"get_sysinfo"`
} `json:"system"`
Emeter struct {
GetRealtime struct{} `json:"get_realtime"`
GetVgainIgain struct{} `json:"get_vgain_igain"`
} `json:"emeter"`
}
type dailyStats struct {
Emeter struct {
GetDaystat struct {
Month int `json:"month"`
Year int `json:"year"`
} `json:"get_daystat"`
} `json:"emeter"`
}
func encrypt(data []byte) []byte {
ciphertext := make([]byte, len(data))
key := hashKey
for i, currentByte := range data {
encByte := key ^ currentByte
key = encByte
ciphertext[i] = encByte
}
return ciphertext
}
func decrypt(ciphertext []byte) []byte {
plaintext := make([]byte, len(ciphertext))
key := hashKey
for i, currentByte := range ciphertext {
decByte := key ^ currentByte
key = currentByte
plaintext[i] = decByte
}
return plaintext
}
func talkToDevice(host string, payload []byte) ([]byte, error) {
// establish connection (two second timeout)
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", host, 9999), time.Second*2)
if err != nil {
return []byte{}, err
}
defer func() {
if err := conn.Close(); err != nil {
log.Fatalf("[ERROR] tplink.go: Unable to close connection: %v\n", err)
}
}()
// encrypt payload
encryptedPayload := encrypt(payload)
frameData := func(data []byte) []byte {
frameSize := len(data)
frameBuffer := make([]byte, frameHeaderSize, frameSize+frameHeaderSize)
binary.BigEndian.PutUint32(frameBuffer, uint32(frameSize))
return append(frameBuffer, data...)
}(encryptedPayload)
// send payload
if _, err := conn.Write(frameData); err != nil {
return nil, fmt.Errorf("[ERROR] tplink.go: Unable to send payload: %v", err)
}
// read payload
data, err := func(r io.Reader) ([]byte, error) {
header := make([]byte, frameHeaderSize)
if _, err := io.ReadFull(r, header); err != nil {
return nil, fmt.Errorf("[ERROR] tplink.go: Unable to read payload: %v", err)
}
frameSize := binary.BigEndian.Uint32(header)
if frameSize > frameMaxSize {
return nil, fmt.Errorf("[ERROR] tplink.go: Returned data exceeds max frame size: 1GB")
}
frameBuffer := make([]byte, frameSize)
_, err := io.ReadFull(r, frameBuffer)
if err != nil {
return nil, fmt.Errorf("[ERROR] tplink.go: Unable to read returned data: %v", err)
}
return frameBuffer, nil
}(conn)
if err != nil {
return nil, err
}
return decrypt(data), nil
}
func getDevID(s *Tplink) (string, error) {
info, err := s.SystemInfo()
if err != nil {
return "", err
}
return info.System.GetSysinfo.DeviceID, nil
}
// SystemInfo Returns information from targeted device
func (s *Tplink) SystemInfo() (SysInfo, error) {
var (
payload getSysInfo
jsonResp SysInfo
)
j, err := json.Marshal(payload)
if err != nil {
return SysInfo{}, fmt.Errorf("[WARN] Unexpected data: %v", err)
}
resp, err := talkToDevice(s.Host, j)
if err != nil {
return jsonResp, err
}
if err := json.Unmarshal(resp, &jsonResp); err != nil {
return jsonResp, err
}
return jsonResp, nil
}
// ChangeState changes the power state of a single port device
// True = on
// False = off
func (s *Tplink) ChangeState(state bool) error {
var payload changeState
if state {
payload.System.SetRelayState.State = 1
} else {
payload.System.SetRelayState.State = 0
}
j, err := json.Marshal(payload)
if err != nil {
return fmt.Errorf("[WARN] Unexpected data: %v", err)
}
if _, err := talkToDevice(s.Host, j); err != nil {
return err
}
return nil
}
// ChangeStateMultiSwitch changes the power state of a device on with multiple outlets/switches
// True = on
// False = off
func (s *Tplink) ChangeStateMultiSwitch(state bool) error {
var payload changeStateMultiSwitch
devID, err := getDevID(s)
if err != nil {
return err
}
payload.Context.ChildIds = append(payload.Context.ChildIds, devID+fmt.Sprintf("%02d", s.SwitchID))
if state {
payload.System.SetRelayState.State = 1
} else {
payload.System.SetRelayState.State = 0
}
j, err := json.Marshal(payload)
if err != nil {
return fmt.Errorf("[WARN] Unexpected data: %v", err)
}
if _, err := talkToDevice(s.Host, j); err != nil {
return err
}
return nil
}
// GetMeterInfo gets the power stats from a device
func (s *Tplink) GetMeterInto() (SysInfo, error) {
var (
payload meterInfo
jsonResp SysInfo
)
j, err := json.Marshal(payload)
if err != nil {
return SysInfo{}, fmt.Errorf("[WARN] Unexpected data: %v", err)
}
resp, err := talkToDevice(s.Host, j)
if err != nil {
return jsonResp, err
}
if err := json.Unmarshal(resp, &jsonResp); err != nil {
return jsonResp, err
}
return jsonResp, nil
}
// GetMeterInfo gets the power stats from a device
func (s *Tplink) GetDailyStats(month, year int) (SysInfo, error) {
var (
payload dailyStats
jsonResp SysInfo
)
payload.Emeter.GetDaystat.Month = month
payload.Emeter.GetDaystat.Year = year
j, err := json.Marshal(payload)
if err != nil {
return SysInfo{}, fmt.Errorf("[WARN] Unexpected data in response: %v", err)
}
resp, err := talkToDevice(s.Host, j)
if err != nil {
return jsonResp, err
}
if err := json.Unmarshal(resp, &jsonResp); err != nil {
return jsonResp, err
}
return jsonResp, nil
}