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sense.go
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sense.go
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package sense
import (
"encoding/json"
"errors"
"fmt"
"log"
"github.com/golang-jwt/jwt"
"github.com/gorilla/websocket"
"io/ioutil"
"net/http"
"net/url"
"reflect"
"strconv"
"strings"
"time"
)
const (
apiUrl = "https://api.sense.com/apiservice/api/v1"
formContentType = "application/x-www-form-urlencoded"
wssHost = "clientrt.sense.com"
senseProtocol = "8"
errMfaRequired = "mfa_required"
deviceId = "dnccvg0pzp62lmdotpg2hho0q7333ihzccpr6ifijc5lh9kigzc7m6jcovy8avq4wb2c40u0tsygwzi3vcj9lkmn0v7wjar36r5tvdqjqcfbtcrqaawfemmvmtamahg2"
defaultTimelineItems = 30
)
var (
MaxMessageCache = 200
)
func (s *SenseApi) apiRequest(method, url, contentType, body string) (res *http.Response, err error) {
if s.authRes.AccessToken != "" && isTokenExpired(s.authRes.AccessToken) {
s.authRes.AccessToken = ""
err = s.RenewToken()
if err != nil {
return res, errors.New("token expired")
}
res, err = s.apiRequest(method, url, contentType, body)
return res, err
}
req, _ := http.NewRequest(method, url, strings.NewReader(body))
headers := req.Header
if contentType != "" {
headers.Add("Content-Type", contentType)
}
headers.Add("x-sense-device-id", deviceId)
headers.Add("authorization", "bearer "+s.authRes.AccessToken)
client := http.Client{}
res, err = client.Do(req)
return res, err
}
func (s *SenseApi) mfaAuth(mfaToken, totp string) (err error) {
u := apiUrl + "/authenticate/mfa"
v := url.Values{}
v.Add("mfaToken", mfaToken)
v.Add("totp", totp)
res, err := s.apiRequest(http.MethodPost, u, formContentType, v.Encode())
if err != nil {
return err
}
authRes := AuthRes{}
err = parseRes(res, &authRes)
if err != nil {
return err
}
if authRes.Authorized {
s.authSet(authRes)
} else {
return errors.New(authRes.ErrorReason)
}
return err
}
func (s *SenseApi) authSet(a AuthRes) {
s.authRes = a
s.wssEndpoint = "monitors/" + s.getMonitorId() + "/realtimefeed"
}
func (s *SenseApi) authenticate(username, password string) (err error) {
authUrl := apiUrl + "/authenticate"
v := url.Values{}
v.Add("email", username)
v.Add("password", password)
res, err := s.apiRequest(http.MethodPost, authUrl, formContentType, v.Encode())
if err != nil {
return err
}
authRes := AuthRes{}
err = parseRes(res, &authRes)
if err != nil {
return err
}
if authRes.Authorized {
s.authSet(authRes)
} else if authRes.Status == errMfaRequired {
if authRes.MfaType != "totp" {
return errors.New("only support totp mfa type but received unsupported mfa type: " + authRes.MfaType)
}
var totp string
fmt.Println("Please enter two factor code: ")
fmt.Scanln(&totp)
err = s.mfaAuth(authRes.MfaToken, totp)
if err != nil {
return err
}
} else {
return errors.New(authRes.ErrorReason)
}
return err
}
func (s *SenseApi) getMonitorId() string {
if len(s.authRes.Monitors) == 0 {
return ""
}
return strconv.FormatInt(int64(s.authRes.Monitors[0].Id), 10)
}
func (s *SenseApi) RenewToken() (err error) {
u := fmt.Sprintf("%s/renew", apiUrl)
v := url.Values{}
v.Add("refresh_token", s.authRes.RefreshToken)
v.Add("user_id", strconv.FormatInt(int64(s.authRes.UserId), 10))
v.Add("is_access_token", "true")
res, err := s.apiRequest(http.MethodPost, u, formContentType, v.Encode())
if err != nil {
return err
}
err = parseRes(res, &s.authRes)
if err != nil {
return err
}
return err
}
func (s *SenseApi) ListenWss() (err error) {
q := url.Values{}
q.Add("access_token", s.authRes.AccessToken)
q.Add("sense_protocol", senseProtocol)
q.Add("sense_client_type", "web")
q.Add("sense_device_id", deviceId)
u := url.URL{Scheme: "wss", Host: wssHost, Path: s.wssEndpoint, RawQuery: q.Encode()}
s.ws, _, err = websocket.DefaultDialer.Dial(u.String(), nil)
return err
}
func (s *SenseApi) AlwaysOn() (al *AlwaysOn, err error) {
u := fmt.Sprintf("%s/app/monitors/%s/devices/always_on", apiUrl, s.getMonitorId())
res, err := s.apiRequest("", u, formContentType, "")
if err != nil {
return al, err
}
al = &AlwaysOn{}
err = parseRes(res, al)
return al, err
}
func (s *SenseApi) DevicesOverview(includeMerged bool) (do *DevicesOverview, err error) {
u := fmt.Sprintf("%s/app/monitors/%s/devices/overview?include_merged=%t", apiUrl, s.getMonitorId(), includeMerged)
res, err := s.apiRequest("", u, "", "")
if err != nil {
return do, err
}
do = &DevicesOverview{}
err = parseRes(res, do)
if err != nil {
return do, err
}
return do, err
}
func (s *SenseApi) TimeLine(items int) (tl *TimeLineRes, err error) {
if items <= 0 {
items = defaultTimelineItems
}
u := fmt.Sprintf("%s/users/%d/timeline?n_items=%d", apiUrl, s.authRes.UserId, items)
res, err := s.apiRequest("", u, "", "")
if err != nil {
return tl, err
}
tl = &TimeLineRes{}
err = parseRes(res, tl)
if err != nil {
return tl, err
}
return tl, err
}
// RateZone Time of Use Rate Zones
func (s *SenseApi) RateZone() (rz *RateZones, err error) {
u := fmt.Sprintf("%s/app/monitors/%s/rate_zones", apiUrl, s.getMonitorId())
res, err := s.apiRequest("", u, "", "")
if err != nil {
return rz, err
}
rz = &RateZones{}
err = parseRes(res, rz)
if err != nil {
return rz, err
}
return rz, err
}
type TrendScale string
const (
TrendMonth TrendScale = "MONTH"
TrendYear TrendScale = "YEAR"
TrendWeek TrendScale = "WEEK"
TrendDay TrendScale = "DAY"
)
func (s *SenseApi) Trend(scale TrendScale, start time.Time) (trend *TrendType, err error) {
v := url.Values{}
v.Add("monitor_id", s.getMonitorId())
v.Add("device_id", "")
v.Add("scale", string(scale))
v.Add("start", start.Format(time.RFC3339))
u := fmt.Sprintf("%s/app/history/trends?%s", apiUrl, v.Encode())
res, err := s.apiRequest("", u, "", "")
if err != nil {
return trend, err
}
trend = &TrendType{}
err = parseRes(res, trend)
if err != nil {
return trend, err
}
return trend, err
}
func (s *SenseApi) reconnect() (err error) {
if s.ws == nil {
if s.authRes.AccessToken != "" && isTokenExpired(s.authRes.AccessToken) {
s.authRes.AccessToken = ""
err = s.RenewToken()
if err != nil {
return err
}
err = s.ListenWss()
if err != nil {
return err
}
} else {
err = s.ListenWss()
if err != nil {
return err
}
}
}
return err
}
// ReadMessageAsync read message async and store messages in cache
// use ReadMessages() to retrieve cached messages
func (s *SenseApi) ReadMessageAsync(close <-chan bool) (err error) {
s.readingAsync = true
for {
select {
case <-close:
s.readingAsync = false
return
default:
err = s.reconnect()
if err != nil {
s.readingAsync = false
return err
}
rt, err := s.ReadMessage()
if err != nil {
s.readingAsync = false
return err
}
s.mutex.Lock()
s.messages = append(s.messages, *rt)
if len(s.messages) > MaxMessageCache {
s.messages = s.messages[len(s.messages)-MaxMessageCache : len(s.messages)]
}
s.mutex.Unlock()
}
}
}
// ReadMessages Read Cached messages
// Cached messages are created async by ReadMessageAsync()
func (s *SenseApi) ReadMessages() (msgs []RealTime, err error) {
if !s.readingAsync {
return msgs, errors.New("reading async not start please run ReadMessageAsync() to start async reader")
}
err = s.reconnect()
if err != nil {
return msgs, err
}
s.mutex.Lock()
msgs = s.messages
s.messages = []RealTime{}
s.mutex.Unlock()
return msgs, err
}
// ReadMessage Read one real time message
func (s *SenseApi) ReadMessage() (msg *RealTime, err error) {
msg = &RealTime{}
err = s.reconnect()
if err != nil {
return msg, err
}
_, b, err := s.ws.ReadMessage()
if err != nil {
return msg, err
}
err = json.Unmarshal(b, &msg)
if err != nil {
return msg, err
}
return msg, err
}
// Close websocket connection
func (s *SenseApi) Close() (err error) {
if s.ws == nil {
return errors.New("websocket already closed")
}
err = s.ws.Close()
if err != nil {
return err
}
s.ws = nil
return err
}
func (s *SenseApi) GetHistoryComparison() (hc HistoryCompare, err error) {
v := url.Values{}
v.Add("monitor_id", s.getMonitorId())
u := fmt.Sprintf("%s/app/history/comparisons?%s", apiUrl, v.Encode())
res, err := s.apiRequest("", u, "", "")
if err != nil {
return hc, err
}
err = parseRes(res, &hc)
if err != nil {
return hc, err
}
return hc, err
}
func unmarshallJWT(token string) (result *jwtClaims) {
t, _, err := new(jwt.Parser).ParseUnverified(token, &jwtClaims{})
if err != nil {
log.Printf("failed to parse jwt token: %s", err)
}
if claims, ok := t.Claims.(*jwtClaims); ok {
return claims
}
return result
}
func isTokenExpired(token string) (ok bool) {
ok = true
tPart := strings.Split(token, ".")
if len(tPart) != 5 {
return ok
}
j := unmarshallJWT(strings.Join(tPart[2:], "."))
exp := j.Exp
if time.Since(time.Unix(int64(exp), 0)) < 0 {
return false
}
return ok
}
func parseRes(res *http.Response, parseType interface{}) (err error) {
if reflect.TypeOf(parseType).Kind() != reflect.Ptr {
return errors.New("parseType must be pointer reference")
}
b, err := ioutil.ReadAll(res.Body)
if err != nil {
return err
}
defer res.Body.Close()
err = json.Unmarshal(b, parseType)
if err != nil {
return err
}
return err
}
func NewSenseApi(username, password string) (s *SenseApi, err error) {
s = &SenseApi{
messages: []RealTime{},
}
err = s.authenticate(username, password)
if err != nil {
return s, err
}
err = s.ListenWss()
return s, err
}