feat(ftp): support upload, download and PASV rebind (#13)

Co-authored-by: E99p1ant <[email protected]>

internal/rule/compile.go

@@ -1,12 +1,20 @@
 package rule
 
-import "strings"
+import (
+	"strings"
+)
 
-func CompileTpl(tpl string, vars map[string]string) (compiled string) {
-	compiled = tpl
+// CompileTpl receive []byte or string type tpl and variables map.
+// Return the template after variable substitution
+func CompileTpl(tpl interface{}, vars map[string]string) (compiled string) {
+	switch v := tpl.(type) {
+	case string:
+		compiled = v
+	case []byte:
+		compiled = string(v)
+	}
 	for n, v := range vars {
 		compiled = strings.ReplaceAll(compiled, "${"+n+"}", v)
 	}
-
 	return compiled
 }