fix proxy rules behavior and implemented a few more rules and commands, dependencies upgrade

internal/route/rules/command.go

@@ -0,0 +1,51 @@
+package rules
+
+import "net/http"
+
+type (
+	CommandHandler interface {
+		// CommandHandler can read and modify the values
+		// then handle the request
+		// finally proceed to next command (or return) base on situation
+		Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool)
+	}
+	// StaticCommand will run then proceed to next command or reverse proxy.
+	StaticCommand http.HandlerFunc
+	// ReturningCommand will run then return immediately.
+	ReturningCommand http.HandlerFunc
+	// DynamicCommand will return base on the request
+	// and can raed or modify the values.
+	DynamicCommand func(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool)
+	// BypassCommand will skip all the following commands
+	// and directly return to reverse proxy.
+	BypassCommand struct{}
+	// Commands is a slice of CommandHandler.
+	Commands []CommandHandler
+)
+
+func (c StaticCommand) Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool) {
+	c(w, r)
+	return true
+}
+
+func (c ReturningCommand) Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool) {
+	c(w, r)
+	return false
+}
+
+func (c DynamicCommand) Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool) {
+	return c(cached, w, r)
+}
+
+func (c BypassCommand) Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool) {
+	return true
+}
+
+func (c Commands) Handle(cached Cache, w http.ResponseWriter, r *http.Request) (proceed bool) {
+	for _, cmd := range c {
+		if !cmd.Handle(cached, w, r) {
+			return false
+		}
+	}
+	return true
+}