feat(ftp): support receive ftp connection (#6)

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

internal/rule/compile.go

@@ -0,0 +1,12 @@
+package rule
+
+import "strings"
+
+func CompileTpl(tpl string, vars map[string]string) (compiled string) {
+	compiled = tpl
+	for n, v := range vars {
+		compiled = strings.ReplaceAll(compiled, "${"+n+"}", v)
+	}
+
+	return compiled
+}