feat: add alias file support

config.go

@@ -42,6 +42,7 @@ var (
 	allowedSenderStr = flagset.String("allowed_sender", "", "Regular expression for valid FROM EMail addresses")
 	allowedRecipStr  = flagset.String("allowed_recipients", "", "Regular expression for valid TO EMail addresses")
 	allowedUsers     = flagset.String("allowed_users", "", "Path to file with valid users/passwords")
+	aliasesFile      = flagset.String("aliases_file", "", "Path to aliases file")
 	command          = flagset.String("command", "", "Path to pipe command")
 	remotesStr       = flagset.String("remotes", "", "Outgoing SMTP servers")
 	strictSender     = flagset.Bool("strict_sender", false, "Use only SMTP servers with Sender matches to From")
@@ -59,12 +60,27 @@ var (
 	allowedSender     *regexp.Regexp
 	allowedRecipients *regexp.Regexp
 	remotes           = []*Remote{}
+	aliasesList       = AliasMap{}
 )
 
 func localAuthRequired() bool {
 	return *allowedUsers != ""
 }
 
+func setupAliases() {
+	if *aliasesFile != "" {
+		aliases := make(AliasMap)
+		aliases, err := AliasLoadFile(*aliasesFile)
+		if err != nil {
+			log.Fatal().
+				Str("file", *aliasesFile).
+				Err(err).
+				Msg("cannot load aliases file")
+		}
+		aliasesList = aliases
+	}
+}
+
 func setupAllowedNetworks() {
 	for _, netstr := range splitstr(*allowedNetsStr, ' ') {
 		baseIP, allowedNet, err := net.ParseCIDR(netstr)
@@ -240,6 +256,7 @@ func ConfigLoad() {
 
 	setupAllowedNetworks()
 	setupAllowedPatterns()
+	setupAliases()
 	setupRemotes()
 	setupListeners()
 	setupTimeouts()