Support .env files if it exists

README.md

@@ -22,7 +22,7 @@ device which produces mail.
 
 ## Main features
 
-* Simple configuration with ini file or environment variables
+* Simple configuration with ini file .env file or environment variables
 * Supports SMTPS/TLS (465), STARTTLS (587) and unencrypted SMTP (25)
 * Checks for sender, receiver, client IP
 * Authentication support with file (LOGIN, PLAIN)

config.go

@@ -194,7 +194,18 @@ func setupTimeouts() {
 }
 
 func ConfigLoad() {
-	// configuration parsing
+	// use .env file if it exists
+	if _, err := os.Stat(".env"); err == nil {
+		if err := ff.Parse(flagset, os.Args[1:],
+			ff.WithEnvVarPrefix("smtprelay"),
+			ff.WithConfigFile(".env"),
+			ff.WithConfigFileParser(ff.EnvParser),
+		); err != nil {
+			fmt.Fprintf(os.Stderr, "error: %v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		// use env variables and smtprelay.ini file
 		if err := ff.Parse(flagset, os.Args[1:],
 			ff.WithEnvVarPrefix("smtprelay"),
 			ff.WithConfigFileFlag("config"),
@@ -203,6 +214,7 @@ func ConfigLoad() {
 			fmt.Fprintf(os.Stderr, "error: %v\n", err)
 			os.Exit(1)
 		}
+	}
 
 	// Set up logging as soon as possible
 	setupLogger()