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communicator.go
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communicator.go
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package communicator
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/Phill93/DoorManager/config"
"github.com/Phill93/DoorManager/log"
jwt "github.com/dgrijalva/jwt-go"
"github.com/spf13/viper"
"io/ioutil"
"net/http"
"os"
"time"
)
// Handles the communication with the controller app
var cfg = config.Config()
var apiClient = &http.Client{
Timeout: time.Second * cfg.GetDuration("http_timeout"),
}
type Communicator struct {
access string
refresh string
lastRefresh time.Time
baseUrl string
}
type tokens struct {
Access string `json:"access"`
Refresh string `json:"refresh"`
}
func NewCommunicator(baseUrl string) Communicator {
var com Communicator
com.baseUrl = baseUrl
t := com.loadTokens()
com.access = t.Access
com.refresh = t.Refresh
ok, err := com.VerifyAccess()
if err != nil {
log.Panic(err)
}
if !ok {
log.Panic("Tokens are not valid!")
}
return com
}
func (c Communicator) loadTokens() tokens {
jsonFile, err := os.Open("tokens.json")
if err != nil {
log.Panic(err)
}
defer jsonFile.Close()
jsonBytes, err := ioutil.ReadAll(jsonFile)
if err != nil {
log.Panic(err)
}
var tokens tokens
err = json.Unmarshal(jsonBytes, &tokens)
if err != nil {
log.Panic(err)
}
return tokens
}
func (c Communicator) saveTokens(tokens tokens) {
file, err := json.Marshal(&tokens)
if err != nil {
log.Panic(err)
}
err = ioutil.WriteFile("tokens.json",file,0600)
if err != nil {
log.Panic(err)
}
}
func (c Communicator) VerifyAccess() (bool, error) {
if c.baseUrl != "" && c.access != "" {
log.Debug("Try to verify token")
p, err := json.Marshal(map[string]string{
"token": c.access,
})
if err != nil {
return false, err
}
res, err := apiClient.Post(fmt.Sprintf("%s/api/token/verify/", c.baseUrl), "application/json;charset=utf-8", bytes.NewBuffer(p))
if err != nil {
return false, err
}
if res.StatusCode == 200 {
log.Debug("Token is valid")
return true, nil
}
log.Debug("Token is invalid")
return false, err
} else {
return false, errors.New("Base Url or access token empty")
}
}
func (c *Communicator) Refresh() error {
if c.baseUrl != "" && c.access != "" {
log.Debug("Try to refresh tokens")
p, err := json.Marshal(map[string]string{
"refresh": c.refresh,
})
if err != nil {
return err
}
res, err := apiClient.Post(fmt.Sprintf("%s/api/token/refresh/", c.baseUrl), "application/json;charset=utf-8", bytes.NewBuffer(p))
defer func() {
if res != nil {
_ = res.Body.Close()
}
}()
if err != nil {
return err
}
if res.StatusCode != 200 {
log.Error("Failed to refresh token")
return nil
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Error(err)
}
var r tokens
err = json.Unmarshal(body, &r)
if err != nil {
return err
}
c.access = r.Access
c.refresh = r.Refresh
c.saveTokens(r)
if cfg.ConfigFileUsed() != "" {
_ = viper.WriteConfig()
}
c.lastRefresh = time.Now()
_, _ = c.VerifyAccess()
return nil
} else {
return errors.New("Base Url or access token empty")
}
}
func (c Communicator) ValidateCode(code string) (bool, error) {
if c.baseUrl != "" && c.access != "" {
p, err := json.Marshal(map[string]string{
"code": code,
})
if err != nil {
return false, err
}
req, err := http.NewRequest("post", fmt.Sprintf("%s/api/codes/verify/", c.baseUrl), bytes.NewBuffer(p))
if err != nil {
return false, err
}
req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", c.access))
res, err := apiClient.Do(req)
if err != nil {
return false, err
}
type response struct {
valid bool
}
var r response
err = json.NewDecoder(res.Body).Decode(&r)
if err != nil {
return false, err
}
if r.valid == true {
return true, nil
}
return false, nil
} else {
return false, errors.New("Base Url or access token empty")
}
}
func parseToken(tokenString string) interface{} {
token, _, err := new(jwt.Parser).ParseUnverified(tokenString, jwt.MapClaims{})
if err != nil {
log.Fatal(err)
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
log.Fatal("Can't convert claims")
}
return claims
}
func (c *Communicator) TokenWatcher() {
for {
ok, err := c.VerifyAccess()
if err == nil {
log.Fatal(err)
}
if ok {
claims := parseToken(c.access)
var tm time.Time
fmt.Print(claims)
//switch exp := claims["exp"].(type) {
// case float64:
// tm = time.Unix(int64(exp), 0)
// case json.Number:
// v, _ := exp.Int64()
// tm = time.Unix(v, 0)
//}
diff := time.Now().Sub(tm).Seconds()
if diff < cfg.GetFloat64("token_refresh_threshold") {
err = c.Refresh()
if err != nil {
log.Fatal(err)
}
}
} else {
log.Fatal("Token invalid!")
}
time.Sleep(time.Second * 10)
}
}