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endpoint.go
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endpoint.go
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package idkproxy
import (
"crypto/hmac"
"crypto/sha256"
"encoding/hex"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/evcc-io/evcc/util"
"github.com/evcc-io/evcc/util/request"
"github.com/evcc-io/evcc/util/urlvalues"
"github.com/evcc-io/evcc/vehicle/vag"
"github.com/evcc-io/evcc/vehicle/vag/cariad"
)
const WellKnown = cariad.BaseURL + "/login/v1/idk/openid-configuration"
var Config = &oidc.ProviderConfig{
AuthURL: "https://identity.vwgroup.io/oidc/v1/authorize",
TokenURL: cariad.BaseURL + "/login/v1/idk/token",
}
var _ vag.TokenExchanger = (*Service)(nil)
type Service struct {
*request.Helper
data url.Values
}
func New(log *util.Logger, q url.Values) *Service {
return &Service{
Helper: request.NewHelper(log),
data: q,
}
}
// https://github.com/arjenvrh/audi_connect_ha/issues/133
const (
qmSecret = "e47866378ef0658ce75d71007a809f34616b9635e2ec228245784c1f63e88d06"
qmClientId = "c95f4fd2"
)
func qmauth(ts int64) string {
secret, _ := hex.DecodeString(qmSecret)
hash := hmac.New(sha256.New, secret)
hash.Write([]byte(strconv.FormatInt(ts, 10)))
return hex.EncodeToString(hash.Sum(nil))
}
func qmauthNow() string {
return "v1:" + qmClientId + ":" + qmauth(time.Now().Unix()/100)
}
// Exchange exchanges an VAG identity token for an IDK token
func (v *Service) Exchange(q url.Values) (*vag.Token, error) {
if err := urlvalues.Require(q, "code", "code_verifier"); err != nil {
return nil, err
}
data := url.Values{
"grant_type": {"authorization_code"},
"response_type": {"token id_token"},
"code": {q.Get("code")},
"code_verifier": {q.Get("code_verifier")},
}
urlvalues.Merge(data, v.data)
var res vag.Token
req, err := request.New(http.MethodPost, Config.TokenURL, strings.NewReader(data.Encode()), map[string]string{
"Content-Type": request.FormContent,
"Accept": request.JSONContent,
"x-qmauth": qmauthNow(),
})
if err == nil {
err = v.DoJSON(req, &res)
}
return &res, err
}
// Refresh refreshes an IDK token
func (v *Service) Refresh(token *vag.Token) (*vag.Token, error) {
data := url.Values{
"grant_type": {"refresh_token"},
"response_type": {"token id_token"},
"refresh_token": {token.RefreshToken},
}
urlvalues.Merge(data, v.data)
var res vag.Token
req, err := request.New(http.MethodPost, Config.TokenURL, strings.NewReader(data.Encode()), map[string]string{
"Content-Type": request.FormContent,
"Accept": request.JSONContent,
"x-qmauth": qmauthNow(),
})
if err == nil {
err = v.DoJSON(req, &res)
}
return &res, err
}
// TokenSource creates token source. Token is refreshed automatically.
func (v *Service) TokenSource(token *vag.Token) vag.TokenSource {
return vag.RefreshTokenSource(token, v.Refresh)
}