return err
	}
	for k, v := range r.PostForm {
		if _, ok := r.Form[k]; !ok {
			r.Form[k] = v
		}
	}
	return nil
}

// getTokenSigningKey returns secret key used to sign JWT session tokens
func getTokenSigningKey() (string, error) {
	secret := globalActiveCred.SecretKey
	if globalSiteReplicationSys.isEnabled() {
		secretKey, err := globalSiteReplicatorCred.Get(GlobalContext)

	if parentUser == "" {
		return errInvalidArgument
	}

	cache := store.lock()
	defer store.unlock()

	secret, err := getTokenSigningKey()
	if err != nil {
		return err
	}

	var revoked bool
	for _, ui := range cache.iamSTSAccountsMap {
		if ui.Credentials.ParentUser != parentUser {
			continue
		}

		return nil, toAPIErrorCode(r.Context(), errInvalidAccessKeyID)
	}
	secret := globalActiveCred.SecretKey
	if globalSiteReplicationSys.isEnabled() && cred.AccessKey != siteReplicatorSvcAcc {
		nsecret, err := getTokenSigningKey()
		if err != nil {
			return nil, toAPIErrorCode(r.Context(), err)
		}
		// sign root's temporary accounts also with site replicator creds
		if cred.ParentUser != globalActiveCred.AccessKey || cred.IsTemp() {

		if u.Credentials.AccessKey != value.AccessKeyID {
			c.Fatalf("Expected access key %s, got %s", value.AccessKeyID, u.Credentials.AccessKey)
		}

		// Retrieve the credential's claims.
		secret, err := getTokenSigningKey()
		if err != nil {
			c.Fatalf("Error getting token signing key: %v", err)
		}
		claims, err := getClaimsFromTokenWithSecret(value.SessionToken, secret)
		if err != nil {

				if err != nil {
					jwtClaims, err = auth.ExtractClaims(cred.SessionToken, globalActiveCred.SecretKey)
				}
			} else {
				var secretKey string
				secretKey, err = getTokenSigningKey()
				if err != nil {
					continue
				}
				jwtClaims, err = auth.ExtractClaims(cred.SessionToken, secretKey)
			}
			if err != nil {
				// skip this cred - session token seems invalid

	if !updatedAt.IsZero() {
		if u, _, err := globalIAMSys.getTempAccount(ctx, stsCred.AccessKey); err == nil {
			if u.UpdatedAt.After(updatedAt) {
				return nil
			}
		}
	}
	secretKey, err := getTokenSigningKey()
	if err != nil {
		return errSRInvalidRequest(err)
	}

	// Verify the session token of the stsCred
	claims, err := auth.ExtractClaims(stsCred.SessionToken, secretKey)
	if err != nil {