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login.go
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login.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"strings"
"github.com/google/go-querystring/query"
)
type Credentials struct {
GrantType string `url:"grant_type"`
Username string `url:"username"`
Password string `url:"password"`
ClientId string `url:"client_id"` // optional
Version string `url:"v"` // optional
DeviceId string `url:"device_id"` // optional
DeviceInfo string `url:"device_info"` // optional
}
type Token struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn uint `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
PersonID int `json:"personId"`
}
type DecodedToken struct {
AUTHENTICATION_APP string `json:"AUTHENTICATION_APP"`
}
func (c Credentials) Login() Token {
fmt.Println("Logging in as", c.Username)
return Login(c.Username, c.Password)
}
var Login = func(id string, pwd string) Token {
// Encode credentials as body of POST request
values, _ := query.Values(Credentials{
GrantType: "password",
Username: id,
Password: pwd,
Version: apiFrontendVersion,
})
// fmt.Println(values.Encode())
reader := bytes.NewReader([]byte(values.Encode()))
// POST Request
contentType := "application/x-www-form-urlencoded;charset=UTF-8"
resp, err := http.Post(apiToken, contentType, reader)
if err != nil {
log.Fatal(err)
}
bytes, err := io.ReadAll(resp.Body)
// Unmarshal response to Token struct
var token Token
err = json.Unmarshal(bytes, &token)
if err != nil {
log.Fatal(err)
}
token.DecodeJWT()
return token
}
func (t *Token) DecodeJWT() {
// b64 decode user data from jwt token
me := strings.Split(t.AccessToken, ".")
decoded, err := base64.StdEncoding.DecodeString(me[1] + "=")
if err != nil {
log.Fatal(err)
}
// unmarshal decoded string
var decodedToken DecodedToken
err = json.Unmarshal(decoded, &decodedToken)
if err != nil {
log.Fatal(err)
}
userData := []Token{}
err = json.Unmarshal([]byte(decodedToken.AUTHENTICATION_APP), &userData)
if err != nil || len(userData) != 1 {
log.Fatal(err)
}
t.PersonID = userData[0].PersonID
}