add fixes from review

extensions/appprovider/pkg/config/parser/parse.go

@@ -6,6 +6,7 @@ import (
 	"github.com/owncloud/ocis/extensions/appprovider/pkg/config"
 	"github.com/owncloud/ocis/extensions/appprovider/pkg/config/defaults"
 	ociscfg "github.com/owncloud/ocis/ocis-pkg/config"
+	"github.com/owncloud/ocis/ocis-pkg/shared"
 
 	"github.com/owncloud/ocis/ocis-pkg/config/envdecode"
 )
@@ -33,5 +34,9 @@ func ParseConfig(cfg *config.Config) error {
 }
 
 func Validate(cfg *config.Config) error {
+	if cfg.TokenManager.JWTSecret == "" {
+		return shared.MissingJWTTokenError(cfg.Service.Name)
+	}
+
 	return nil
 }

extensions/appprovider/pkg/config/reva.go

@@ -7,5 +7,5 @@ type Reva struct {
 
 // TokenManager is the config for using the reva token manager
 type TokenManager struct {
-	JWTSecret string `yaml:"jwt_secret" env:"OCIS_JWT_SECRET;OCS_JWT_SECRET"`
+	JWTSecret string `yaml:"jwt_secret" env:"OCIS_JWT_SECRET;APP_PROVIDER_JWT_SECRET"`
 }