Lots of internal cleanup

internal/config/domains.go

@@ -0,0 +1,41 @@
+package config
+
+import "strings"
+
+// This file contains domain related derived configuration values.
+
+// HTTPSEnabled returns if the distillery has HTTPS enabled, and false otherwise.
+func (cfg Config) HTTPSEnabled() bool {
+	return cfg.CertbotEmail != ""
+}
+
+// IfHttps returns value when the distillery has https enabled, and the empty string otherwise.
+func (cfg Config) IfHttps(value string) string {
+	if !cfg.HTTPSEnabled() {
+		return ""
+	}
+	return value
+}
+
+// DefaultHost returns the default hostname for the distillery.
+//
+// This consists of the [DefaultDomain] as well as [ExtraDomains].
+// Domain names are concatinated with commas.
+func (cfg Config) DefaultHost() string {
+	var builder strings.Builder
+
+	builder.WriteString(cfg.DefaultDomain)
+	for _, domain := range cfg.SelfExtraDomains {
+		builder.WriteRune(',')
+		builder.WriteString(domain)
+	}
+
+	return builder.String()
+}
+
+// DefaultSSLHost returns the default hostname for the ssl version of the distillery.
+//
+// This is exactly [DefaultHost] when SSL is enabled, and the empty string otherwise.
+func (cfg Config) DefaultSSLHost() string {
+	return cfg.IfHttps(cfg.DefaultHost())
+}