/
keycloakTokenManager.go
138 lines (118 loc) · 3.61 KB
/
keycloakTokenManager.go
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package tokenmanager
import (
"encoding/json"
"errors"
"github.com/Masterminds/log-go"
"io"
"net/http"
"net/url"
"strings"
"time"
)
func NewTokenManager(openIdConnectTokenUrl string, clientId string, secretKey string) AlpTokenManager {
return &tokenManagerKeycloak{
openIdConnectTokenUrl: openIdConnectTokenUrl,
clientId: clientId,
secretKey: secretKey,
responseModel: &TokenResponseModel{},
client: &http.Client{},
}
}
func NewTokenManagerWithCustomClient(openIdConnectTokenUrl string, clientId string, secretKey string, client *http.Client) AlpTokenManager {
return &tokenManagerKeycloak{
openIdConnectTokenUrl: openIdConnectTokenUrl,
clientId: clientId,
secretKey: secretKey,
responseModel: &TokenResponseModel{},
client: client,
}
}
type tokenManagerKeycloak struct {
openIdConnectTokenUrl string
clientId string
secretKey string
responseModel *TokenResponseModel
client *http.Client
}
var grantTypeCredentials = "client_credentials"
var grantTypeRefreshToken = "refresh_token"
var expireThreshold int64 = 30
func (t tokenManagerKeycloak) GetBearerToken() (string, error) {
if t.responseModel.AccessToken == "" {
err := t.getToken()
if err != nil {
log.Error("error while getting token. ", err)
return "", err
}
} else if t.responseModel.ExpiredAt < (time.Now().Unix() + expireThreshold) {
err := t.RefreshToken()
if err != nil {
log.Error("error while getting token. ", err)
return "Bearer " + t.responseModel.AccessToken, err
}
}
return "Bearer " + t.responseModel.AccessToken, nil
}
func (t tokenManagerKeycloak) RefreshToken() error {
var err error
if t.responseModel.RefreshToken == "" || t.responseModel.RefreshExpiredAt < (time.Now().Unix()+expireThreshold) {
err = t.getToken()
} else {
err = t.refreshToken()
}
if err != nil {
log.Error("error while getting token. ", err)
}
return nil
}
func (t *tokenManagerKeycloak) ClearToken() {
t.responseModel = &TokenResponseModel{}
log.Info("Token cleared")
}
func (t *tokenManagerKeycloak) refreshToken() error {
data := url.Values{}
data.Set("client_id", t.clientId)
data.Set("client_secret", t.secretKey)
data.Set("grant_type", grantTypeRefreshToken)
data.Set("refresh_token", t.responseModel.RefreshToken)
err := t.requestToken(data)
if err != nil {
log.Error("Token refresh request error", err)
} else {
log.Info("Token refreshed")
}
return err
}
func (t *tokenManagerKeycloak) getToken() error {
data := url.Values{}
data.Set("client_id", t.clientId)
data.Set("client_secret", t.secretKey)
data.Set("grant_type", grantTypeCredentials)
err := t.requestToken(data)
if err != nil {
log.Error("Token request error", err)
} else {
log.Info("Token received")
}
return err
}
func (t *tokenManagerKeycloak) requestToken(data url.Values) error {
r, _ := http.NewRequest(http.MethodPost, t.openIdConnectTokenUrl, strings.NewReader(data.Encode())) // URL-encoded payload
r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := t.client.Do(r)
if err != nil {
return err
} else {
bodyBytes, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return errors.New("response not successful. statusCode: " + resp.Status + " response: " + string(bodyBytes))
}
_ = json.Unmarshal(bodyBytes, t.responseModel)
t.responseModel.ExpiredAt = time.Now().Unix() + t.responseModel.ExpiresIn
t.responseModel.RefreshExpiredAt = time.Now().Unix() + t.responseModel.RefreshExpiresIn
return nil
}
}