Add TINYAUTH_AUTH_STANDALONE option

Allows to use TinyAuth on top-level domain only, but forbids
automatic cross-app authentication using Traefik or Nginx.

Author: jacekkow

internal/bootstrap/app_bootstrap.go

@@ -99,7 +99,13 @@ func (app *BootstrapApp) Setup() error {
 	}
 
 	// Get cookie domain
-	cookieDomain, err := utils.GetCookieDomain(app.context.appUrl)
+	cookieDomainResolver := utils.GetCookieDomain
+	if app.config.Auth.Standalone {
+		tlog.App.Info().Msg("Standalone mode enabled, automatic authentication for proxied apps will not work")
+		cookieDomainResolver = utils.GetStandaloneCookieDomain
+	}
+
+	cookieDomain, err := cookieDomainResolver(app.context.appUrl)
 
 	if err != nil {
 		return err

internal/config/config.go

@@ -115,6 +115,7 @@ type AuthConfig struct {
 	IP                 IPConfig `description:"IP whitelisting config options." yaml:"ip"`
 	Users              []string `description:"Comma-separated list of users (username:hashed_password)." yaml:"users"`
 	UsersFile          string   `description:"Path to the users file." yaml:"usersFile"`
+	Standalone         bool     `description:"Run in standalone mode, do not set cookies for subdomains." yaml:"standalone"`
 	SecureCookie       bool     `description:"Enable secure cookies." yaml:"secureCookie"`
 	SessionExpiry      int      `description:"Session expiry time in seconds." yaml:"sessionExpiry"`
 	SessionMaxLifetime int      `description:"Maximum session lifetime in seconds." yaml:"sessionMaxLifetime"`

internal/utils/app_utils.go

@@ -43,6 +43,15 @@ func GetCookieDomain(u string) (string, error) {
 	return domain, nil
 }
 
+func GetStandaloneCookieDomain(u string) (string, error) {
+	parsed, err := url.Parse(u)
+	if err != nil {
+		return "", err
+	}
+
+	return parsed.Hostname(), nil
+}
+
 func ParseFileToLine(content string) string {
 	lines := strings.Split(content, "\n")
 	users := make([]string, 0)