diff --git a/internal/middleware/notify_token.go b/internal/middleware/notify_token.go
index 067e6a2..30e6bd0 100644
--- a/internal/middleware/notify_token.go
+++ b/internal/middleware/notify_token.go
@@ -29,7 +29,7 @@ func NotifyTokenAuth() gin.HandlerFunc {
 			return
 		}
 
-		if strings.ToLower(token) != strings.ToLower(savedToken) {
+		if !strings.EqualFold(token, savedToken) {
 			utils.Unauthorized(c, "通知 Token 无效")
 			c.Abort()
 			return
diff --git a/internal/sdk/messenger/channels/dtalk.go b/internal/sdk/messenger/channels/dtalk.go
index 4e9cc8c..fd4e162 100644
--- a/internal/sdk/messenger/channels/dtalk.go
+++ b/internal/sdk/messenger/channels/dtalk.go
@@ -26,11 +26,12 @@ func (c *DtalkChannel) Send(config ChannelConfig, msg *Message) (*Result, error)
 	var res []byte
 	var err error
 
-	if contentType == FormatTypeText {
+	switch contentType {
+	case FormatTypeText:
 		res, err = cli.SendMessageText(formattedContent, atMobiles...)
-	} else if contentType == FormatTypeMarkdown {
+	case FormatTypeMarkdown:
 		res, err = cli.SendMessageMarkdown(msg.Title, formattedContent, atMobiles...)
-	} else {
+	default:
 		return SendError("未知的钉钉发送内容类型：%s", contentType), nil
 	}
 
diff --git a/internal/sdk/messenger/channels/email.go b/internal/sdk/messenger/channels/email.go
index 45b4056..e45d076 100644
--- a/internal/sdk/messenger/channels/email.go
+++ b/internal/sdk/messenger/channels/email.go
@@ -34,11 +34,12 @@ func (c *EmailChannel) Send(config ChannelConfig, msg *Message) (*Result, error)
 	emailer.Init(server, port, account, passwd, fromName)
 
 	var errMsg string
-	if contentType == FormatTypeText {
+	switch contentType {
+	case FormatTypeText:
 		errMsg = emailer.SendTextMessage(toAccount, msg.Title, formattedContent)
-	} else if contentType == FormatTypeHTML {
+	case FormatTypeHTML:
 		errMsg = emailer.SendHtmlMessage(toAccount, msg.Title, formattedContent)
-	} else {
+	default:
 		errMsg = fmt.Sprintf("未知的邮件发送内容类型：%s", contentType)
 	}
 
diff --git a/internal/sdk/messenger/channels/feishu.go b/internal/sdk/messenger/channels/feishu.go
index ecf23f2..7208cee 100644
--- a/internal/sdk/messenger/channels/feishu.go
+++ b/internal/sdk/messenger/channels/feishu.go
@@ -28,11 +28,12 @@ func (c *FeishuChannel) Send(config ChannelConfig, msg *Message) (*Result, error
 	var res []byte
 	var err error
 
-	if contentType == FormatTypeText {
+	switch contentType {
+	case FormatTypeText:
 		res, err = cli.SendMessageText(formattedContent, atList...)
-	} else if contentType == FormatTypeMarkdown {
+	case FormatTypeMarkdown:
 		res, err = cli.SendMessageMarkdown(msg.Title, formattedContent, atList...)
-	} else {
+	default:
 		return SendError("未知的飞书发送内容类型：%s", contentType), nil
 	}
 
diff --git a/internal/sdk/messenger/channels/helpers.go b/internal/sdk/messenger/channels/helpers.go
index 4eef1aa..b4400ac 100644
--- a/internal/sdk/messenger/channels/helpers.go
+++ b/internal/sdk/messenger/channels/helpers.go
@@ -34,10 +34,8 @@ func sendAliyunSMS(client *dysmsapi.Client, phoneNumber, signName, templateCode,
 	templateParam := map[string]interface{}{
 		"content": content,
 	}
-	if extra != nil {
-		for k, v := range extra {
-			templateParam[k] = v
-		}
+	for k, v := range extra {
+		templateParam[k] = v
 	}
 	templateParamJSON, _ := json.Marshal(templateParam)
 
diff --git a/internal/sdk/messenger/channels/qyweixin.go b/internal/sdk/messenger/channels/qyweixin.go
index b9b706c..f9329d1 100644
--- a/internal/sdk/messenger/channels/qyweixin.go
+++ b/internal/sdk/messenger/channels/qyweixin.go
@@ -27,11 +27,12 @@ func (c *QyWeiXinChannel) Send(config ChannelConfig, msg *Message) (*Result, err
 	var res []byte
 	var err error
 
-	if contentType == FormatTypeText {
+	switch contentType {
+	case FormatTypeText:
 		res, err = cli.SendMessageText(formattedContent, atList...)
-	} else if contentType == FormatTypeMarkdown {
+	case FormatTypeMarkdown:
 		res, err = cli.SendMessageMarkdown(msg.Title, formattedContent, atList...)
-	} else {
+	default:
 		return SendError("未知的企业微信发送内容类型：%s", contentType), nil
 	}