Add DDNS support (#324)

* feat: add ddns updater framework

Note: no functionality implemented yet

* feat: add webhook ddns provider

* feat: update dashboard template

* fix: check nil and cron task string

* fix: webhook string formated with unexcepted param

* fix: webhook header split error

* feat: cloudflare ddns provider

* refract: move ddns update trigger into ReportSystemInfo

* lang: update other languages text

* fix: clear codes and logics

* fix: move update ddns to goroutine to avoid blocking

* fix: clear unused codes

* fix: update timestamp to prevent cache

model/config.go

@@ -112,6 +112,19 @@ type Config struct {
 	IgnoredIPNotificationServerIDs map[uint64]bool // [ServerID] -> bool(值为true代表当前ServerID在特定服务器列表内）
 	MaxTCPPingValue                int32
 	AvgPingCount                   int
+
+	// 动态域名解析更新
+	DDNS struct {
+		Enable             bool
+		Provider           string
+		AccessID           string
+		AccessSecret       string
+		WebhookURL         string
+		WebhookMethod      string
+		WebhookRequestBody string
+		WebhookHeaders     string
+		MaxRetries         uint32
+	}
 }
 
 // Read 读取配置文件并应用
@@ -152,6 +165,15 @@ func (c *Config) Read(path string) error {
 	if c.AvgPingCount == 0 {
 		c.AvgPingCount = 2
 	}
+	if c.DDNS.Provider == "" {
+		c.DDNS.Provider = "webhook"
+	}
+	if c.DDNS.WebhookMethod == "" {
+		c.DDNS.WebhookMethod = "POST"
+	}
+	if c.DDNS.MaxRetries == 0 {
+		c.DDNS.MaxRetries = 3
+	}
 
 	c.updateIgnoredIPNotificationID()
 	return nil