add user scripting with lua

config.go

@@ -19,6 +19,12 @@ type OAuthProvider struct {
 	ClientID     string `toml:"client_id"`
 	ClientSecret string `toml:"client_secret"`
 	RedirectURL  string `toml:"redirect_url"`
+
+	// Only for custom OAuth provider
+	AuthURL  string   `toml:"auth_url"`
+	TokenURL string   `toml:"token_url"`
+	Scopes   []string `toml:"scopes"`
+	Script   string   `toml:"info_script"`
 }
 
 type Config struct {
@@ -50,6 +56,15 @@ func LoadConfig() (Config, oauth2.Config, error) {
 	case "google":
 		oa2.Endpoint = endpoints.Google
 		oa2.Scopes = []string{"https://www.googleapis.com/auth/userinfo.email"}
+	default:
+		oa2.Endpoint = oauth2.Endpoint{
+			AuthURL:  config.OAuthProvider.AuthURL,
+			TokenURL: config.OAuthProvider.TokenURL,
+		}
+		oa2.Scopes = config.OAuthProvider.Scopes
+		if config.OAuthProvider.Script == "" {
+			panic("no script provided")
+		}
 	}
 
 	return config, oa2, err