commit 8d8f68957f6fa70c0f0cc719e2952b52f09b80a6
Author: The_Spider <nhyatt@smoothnet.org>
Date:   Sat Dec 4 10:15:16 2021 -0600

    initial commit

diff --git a/cmd/tpstate/config.go b/cmd/tpstate/config.go
new file mode 100644
index 0000000..a3bed43
--- /dev/null
+++ b/cmd/tpstate/config.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"os"
+	"time"
+
+	"github.com/hashicorp/logutils"
+	"github.com/kelvins/sunrisesunset"
+)
+
+type configStructure struct {
+	// time configuration
+	TimeFormat string         `json:"time_format"`
+	TimeZone   *time.Location `json:"time_zone"`
+
+	// logging
+	LogLevel int                   `json:"log_level"`
+	Log      *logutils.LevelFilter `json:"log_level_fileter"`
+
+	//sunriseset configuration
+	SunRiseSet *sunrisesunset.Parameters `json:"sun_rise_set_configuration"`
+
+	// mode of operation
+	CalculateDate time.Time `json:"sunrise_sunset_calculation_date"`
+	SecondsUntil bool `json:"seconds_until"`
+	NextSunriseSunset bool `json:"next_sunrise_sunset"`
+}
+
+// Set Defaults
+var config = configStructure{
+	LogLevel:   50,
+	TimeFormat: "2006-01-02 15:04:05",
+	Log: &logutils.LevelFilter{
+		Levels: []logutils.LogLevel{"TRACE", "DEBUG", "INFO", "WARNING", "ERROR"},
+		Writer: os.Stderr,
+	},
+	SunRiseSet: &sunrisesunset.Parameters{
+		Latitude:  38.749020,
+		Longitude: -90.521360,
+	},
+}
diff --git a/cmd/tpstate/init.go b/cmd/tpstate/init.go
new file mode 100644
index 0000000..76d3e9d
--- /dev/null
+++ b/cmd/tpstate/init.go
@@ -0,0 +1,136 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/hashicorp/logutils"
+)
+
+func getEnvFloat64(env string, def float64) (val float64) {
+	osVal := os.Getenv(env)
+
+	if osVal == "" {
+		return def
+	}
+
+	var err error
+	if val, err = strconv.ParseFloat(osVal, 64); err != nil {
+		log.Fatalf("[ERROR] Unable to parse floating point number from environment variable (%s): %v", env, err)
+	}
+	return
+}
+
+func getEnvInt(env string, def int) (ret int) {
+	val := os.Getenv(env)
+
+	if val == "" {
+		return def
+	}
+
+	ret, err := strconv.Atoi(val)
+	if err != nil {
+		log.Fatalf("[ERROR] Environment variable is not of numeric type: %v\n", env)
+	}
+
+	return
+}
+
+func getEnvString(env, def string) (val string) {
+	val = os.Getenv(env)
+
+	if val == "" {
+		return def
+	}
+
+	return
+}
+
+func getEnvBool(env string, def bool) (val bool) {
+	osVal := os.Getenv(env)
+
+	if osVal == "" {
+		return def
+	}
+
+	var err error
+	if val, err = strconv.ParseBool(osVal); err != nil {
+		log.Fatalf("[ERROR] Environment variable is not of boolean type: %v\n", env)
+	}
+
+	return
+}
+
+func setLogLevel(l int) {
+	switch {
+	case l <= 20:
+		config.Log.SetMinLevel(logutils.LogLevel("ERROR"))
+	case l > 20 && l <= 40:
+		config.Log.SetMinLevel(logutils.LogLevel("WARNING"))
+	case l > 40 && l <= 60:
+		config.Log.SetMinLevel(logutils.LogLevel("INFO"))
+	case l > 60 && l <= 80:
+		config.Log.SetMinLevel(logutils.LogLevel("DEBUG"))
+	case l > 80:
+		config.Log.SetMinLevel(logutils.LogLevel("TRACE"))
+	}
+}
+
+func initialize() {
+	var (
+		tz  string
+		dt  string
+		err error
+	)
+
+	flag.IntVar(&config.LogLevel,
+		"log",
+		getEnvInt("LOG_LEVEL", 0),
+		"(LOG_LEVEL) Set the log verbosity.",
+	)
+	flag.Float64Var(&config.SunRiseSet.Latitude,
+		"latitude",
+		getEnvFloat64("LATITUDE", 38.749020),
+		"(LATITUDE) Latitude for the sunset/sunrise calculation.",
+	)
+	flag.Float64Var(&config.SunRiseSet.Longitude,
+		"longitude",
+		getEnvFloat64("LONGITUDE", -90.521360),
+		"(LONGITUDE) Longitude for the sunrise/sunset calculation.",
+	)
+	flag.StringVar(&tz,
+		"timezone",
+		getEnvString("TIMEZONE", "America/Chicago"),
+		"(TIMEZONE) Timezone for the sunrise/sunset calculation.",
+	)
+	flag.StringVar(&dt,
+		"date",
+		getEnvString("DATE", time.Now().Format(config.TimeFormat)),
+		"(DATE) Date to use for sunrise/sunset calculation.",
+	)
+	flag.BoolVar(&config.NextSunriseSunset,
+		"next",
+		getEnvBool("NEXT", true),
+		"(NEXT) Determine and calculate the next occuring sunrise/sunset date & time.",
+	)
+	flag.Parse()
+
+	setLogLevel(config.LogLevel)
+	log.SetOutput(config.Log)
+
+	config.CalculateDate, err = time.Parse(config.TimeFormat, dt)
+	if err != nil {
+		log.Fatalf("[ERROR] Unable to parse time: %v\n", err)
+	}
+
+	config.TimeZone, err = time.LoadLocation(tz)
+	if err != nil {
+		log.Fatalf("[ERROR] Unable to parse time zone: %v\n", err)
+	}
+
+	_, tzOffset := config.CalculateDate.In(config.TimeZone).Zone()
+	config.SunRiseSet.UtcOffset = float64(tzOffset / 60 / 60)
+}
diff --git a/cmd/tpstate/main.go b/cmd/tpstate/main.go
new file mode 100644
index 0000000..a95e101
--- /dev/null
+++ b/cmd/tpstate/main.go
@@ -0,0 +1,14 @@
+package main
+
+import (
+	"log"
+)
+
+func main() {
+	initialize()
+
+	_, _, err := nextSunriseSunsetTime(config.CalculateDate)
+	if err != nil {
+		log.Fatalf("[ERROR] Unable to calculate sunrise/sunset: %v\n", err)
+	}
+}
diff --git a/cmd/tpstate/sunCalculations.go b/cmd/tpstate/sunCalculations.go
new file mode 100644
index 0000000..4881f76
--- /dev/null
+++ b/cmd/tpstate/sunCalculations.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"log"
+	"time"
+)
+
+func nextSunriseSunsetTime(t time.Time) (time.Time, time.Time, error) {
+	s := config.SunRiseSet
+
+	s.Date = t
+	currentSR, currentSS, err := s.GetSunriseSunset()
+	if err != nil {
+		return time.Time{}, time.Time{}, err
+	}
+
+	s.Date = t.Add(24 * time.Hour)
+	nextSR, nextSS, err := s.GetSunriseSunset()
+	if err != nil {
+		return time.Time{}, time.Time{}, err
+	}
+
+	var (
+		nSR time.Time
+		nSS time.Time
+	)
+
+	if currentSR.After(t) {
+		nSR = currentSR
+	} else {
+		nSR = nextSR
+	}
+
+	if currentSS.After(t) {
+		nSS = currentSS
+	} else {
+		nSS = nextSS
+	}
+
+	log.Printf("[TRACE] Next calculated sunrise: %s\n", nSR.Format("2006-01-02 15:04:05"))
+	log.Printf("[TRACE] Next calculated sunset : %s\n", nSS.Format("2006-01-02 15:04:05"))
+
+	return nSR, nSS, nil
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..69a2b1e
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module tplink
+
+go 1.17
+
+require (
+	github.com/hashicorp/logutils v1.0.0
+	github.com/kelvins/sunrisesunset v0.0.0-20210220141756-39fa1bd816d5
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..a93efce
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/hashicorp/logutils v1.0.0 h1:dLEQVugN8vlakKOUE3ihGLTZJRB4j+M2cdTm/ORI65Y=
+github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
+github.com/kelvins/sunrisesunset v0.0.0-20210220141756-39fa1bd816d5 h1:ouekCqYkMw4QXFCaLyYqjBe99/MUW4Qf3DJhCRh1G18=
+github.com/kelvins/sunrisesunset v0.0.0-20210220141756-39fa1bd816d5/go.mod h1:3oZ7G+fb8Z8KF+KPHxeDO3GWpEjgvk/f+d/yaxmDRT4=
diff --git a/internal/tplink/tplink.go b/internal/tplink/tplink.go
new file mode 100644
index 0000000..4518291
--- /dev/null
+++ b/internal/tplink/tplink.go
@@ -0,0 +1,249 @@
+package tplink
+
+import (
+	"bufio"
+	"bytes"
+	"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
+
+// 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"`
+}
+
+// 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"`
+}
+
+func encrypt(plaintext string) []byte {
+	n := len(plaintext)
+	buf := new(bytes.Buffer)
+	if err := binary.Write(buf, binary.BigEndian, uint32(n)); err != nil {
+		log.Printf("[WARNING] tplink.go: Unable to write to buffer %v\n", err)
+	}
+	ciphertext := buf.Bytes()
+
+	key := hashKey
+	payload := make([]byte, n)
+	for i := 0; i < n; i++ {
+		payload[i] = plaintext[i] ^ key
+		key = payload[i]
+	}
+
+	for i := 0; i < len(payload); i++ {
+		ciphertext = append(ciphertext, payload[i])
+	}
+
+	return ciphertext
+}
+
+func decrypt(ciphertext []byte) string {
+	n := len(ciphertext)
+	key := hashKey
+	var nextKey byte
+	for i := 0; i < n; i++ {
+		nextKey = ciphertext[i]
+		ciphertext[i] ^= key
+		key = nextKey
+	}
+	return string(ciphertext)
+}
+
+func send(host string, dataSend []byte) ([]byte, error) {
+	var header = make([]byte, 4)
+
+	// establish connection (two second timeout)
+	conn, err := net.DialTimeout("tcp", host+":9999", time.Second*2) //nolint:gomnd
+	if err != nil {
+		return []byte{}, err
+	}
+	defer func() {
+		if err := conn.Close(); err != nil { //nolint:govet
+			log.Fatalf("[ERROR] tplink.go: Unable to close connection: %v\n", err)
+		}
+	}()
+
+	// submit data to device
+	writer := bufio.NewWriter(conn)
+	_, err = writer.Write(dataSend)
+	if err != nil {
+		return []byte{}, err
+	}
+	if err := writer.Flush(); err != nil { //nolint:govet
+		return []byte{}, err
+	}
+
+	// read response header to determine response size
+	headerReader := io.LimitReader(conn, int64(4)) //nolint:gomnd
+	_, err = headerReader.Read(header)
+	if err != nil {
+		return []byte{}, err
+	}
+
+	// read response
+	respSize := int64(binary.BigEndian.Uint32(header))
+	respReader := io.LimitReader(conn, respSize)
+	var response = make([]byte, respSize)
+	_, err = respReader.Read(response)
+	if err != nil {
+		return []byte{}, err
+	}
+
+	return response, 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, _ := json.Marshal(payload)
+
+	data := encrypt(string(j))
+	resp, err := send(s.Host, data)
+	if err != nil {
+		return jsonResp, err
+	}
+
+	if err := json.Unmarshal([]byte(decrypt(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, _ := json.Marshal(payload)
+	data := encrypt(string(j))
+	if _, err := send(s.Host, data); 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, _ := json.Marshal(payload)
+	data := encrypt(string(j))
+	if _, err := send(s.Host, data); err != nil {
+		return err
+	}
+	return nil
+}