fix: resolve message sending failure when containing "\n" using webhook and custom channel (#111)

* 使用webhook和custom通道发送消息时如果内容中包含\n会推送失败的问题

* 消息查看页面增加markdown内容解析，访问链接页面增加GFM拓展解析

* 访问链接页面GFM footnote支持

common/utils.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"github.com/google/uuid"
 	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
 	"html/template"
 	"log"
 	"net"
@@ -148,7 +149,13 @@ func Markdown2HTML(markdown string) (HTML string, err error) {
 		return "", nil
 	}
 	var buf bytes.Buffer
-	err = goldmark.Convert([]byte(markdown), &buf)
+	goldMarkEntity := goldmark.New(
+		goldmark.WithExtensions(
+			extension.GFM,
+			extension.Footnote,
+		),
+	)
+	err = goldMarkEntity.Convert([]byte(markdown), &buf)
 	if err != nil {
 		return fmt.Sprintf("Markdown 渲染出错：%s", err.Error()), err
 	}
@@ -159,3 +166,8 @@ func Markdown2HTML(markdown string) (HTML string, err error) {
 func GetTimestamp() int64 {
 	return time.Now().Unix()
 }
+
+func Replace(s, old, new string, n int) string {
+	new = strings.TrimPrefix(strings.TrimSuffix(fmt.Sprintf("%q", new), "\""), "\"")
+	return strings.Replace(s, old, new, n)
+}