feat(auth-app): make service optional plus docu

Signed-off-by: jkoberg <jkoberg@owncloud.com>

services/proxy/pkg/command/server.go

@@ -294,10 +294,12 @@ func loadMiddlewares(logger log.Logger, cfg *config.Config,
 		})
 	}
 
-	authenticators = append(authenticators, middleware.AppAuthAuthenticator{
-		Logger:              logger,
-		RevaGatewaySelector: gatewaySelector,
-	})
+	if cfg.AuthMiddleware.AllowAppAuth {
+		authenticators = append(authenticators, middleware.AppAuthAuthenticator{
+			Logger:              logger,
+			RevaGatewaySelector: gatewaySelector,
+		})
+	}
 	authenticators = append(authenticators, middleware.PublicShareAuthenticator{
 		Logger:              logger,
 		RevaGatewaySelector: gatewaySelector,

services/proxy/pkg/config/config.go

@@ -91,6 +91,7 @@ var (
 // AuthMiddleware configures the proxy http auth middleware.
 type AuthMiddleware struct {
 	CredentialsByUserAgent map[string]string `yaml:"credentials_by_user_agent"`
+	AllowAppAuth           bool              `yaml:"allow_app_auth" env:"PROXY_ENABLE_APP_AUTH" desc:"Allow app authentication. This can be used to authenticate 3rd party applications. Note that auth-app service must be running for this feature to work." introductionVersion:"%NEXT%"`
 }
 
 // PoliciesMiddleware configures the proxy's policies middleware.