feat: configuration

internal/pkg/config/secrets.go

@@ -0,0 +1,34 @@
+package config
+
+import (
+	"io"
+	"os"
+	"strings"
+
+	"github.com/sethvargo/go-envconfig"
+)
+
+func secretLookuper() envconfig.LookuperFunc {
+	return func(key string) (string, bool) {
+		fileName := os.Getenv(key + "_FILE")
+		if fileName == "" {
+			return "", false
+		}
+
+		file, err := os.Open(fileName)
+		if err != nil {
+			return "", false
+		}
+
+		defer file.Close()
+
+		sb := &strings.Builder{}
+
+		_, err = io.Copy(sb, file)
+		if err != nil {
+			return "", false
+		}
+
+		return sb.String(), true
+	}
+}