package utils import ( "bytes" "regexp" "strings" "github.com/PuerkitoBio/goquery" "github.com/mindoc-org/mindoc/conf" ) func StripTags(s string) string { //将HTML标签全转换成小写 re, _ := regexp.Compile("\\<[\\S\\s]+?\\>") src := re.ReplaceAllStringFunc(s, strings.ToLower) //去除STYLE re, _ = regexp.Compile("\\") src = re.ReplaceAllString(src, "") //去除SCRIPT re, _ = regexp.Compile("\\") src = re.ReplaceAllString(src, "") //去除所有尖括号内的HTML代码，并换成换行符 re, _ = regexp.Compile("\\<[\\S\\s]+?\\>") src = re.ReplaceAllString(src, "\n") //去除连续的换行符 re, _ = regexp.Compile("\\s{2,}") src = re.ReplaceAllString(src, "\n") return src } //自动提取文章摘要 func AutoSummary(body string, l int) string { //匹配图片，如果图片语法是在代码块中，这里同样会处理 re := regexp.MustCompile(`

(.*?)

`) contents := re.FindAllString(body, -1) if len(contents) <= 0 { return "" } content := "" for _, s := range contents { b := strings.Replace(StripTags(s), "\n", "", -1) if l <= 0 { break } l = l - len([]rune(b)) content += b } return content } //安全处理HTML文档，过滤危险标签和属性. func SafetyProcessor(html string) string { //安全过滤，移除危险标签和属性 if docQuery, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html)); err == nil { docQuery.Find("script").Remove() docQuery.Find("form").Remove() docQuery.Find("link").Remove() docQuery.Find("applet").Remove() docQuery.Find("frame").Remove() docQuery.Find("meta").Remove() if !conf.GetEnableIframe() { docQuery.Find("iframe").Remove() } docQuery.Find("*").Each(func(i int, selection *goquery.Selection) { if href, ok := selection.Attr("href"); ok && strings.HasPrefix(href, "javascript:") { selection.SetAttr("href", "#") } if src, ok := selection.Attr("src"); ok && strings.HasPrefix(src, "javascript:") { selection.SetAttr("src", "#") } selection.RemoveAttr("onafterprint"). RemoveAttr("onbeforeprint"). RemoveAttr("onbeforeunload"). RemoveAttr("onload"). RemoveAttr("onclick"). RemoveAttr("onkeydown"). RemoveAttr("onkeypress"). RemoveAttr("onkeyup"). RemoveAttr("ondblclick"). RemoveAttr("onmousedown"). RemoveAttr("onmousemove"). RemoveAttr("onmouseout"). RemoveAttr("onmouseover"). RemoveAttr("onmouseup") }) //处理外链 docQuery.Find("a").Each(func(i int, contentSelection *goquery.Selection) { if src, ok := contentSelection.Attr("href"); ok { if strings.HasPrefix(src, "http://") || strings.HasPrefix(src, "https://") { if conf.BaseUrl != "" && !strings.HasPrefix(src, conf.BaseUrl) { contentSelection.SetAttr("target", "_blank") } } } }) //添加文档标签包裹 if selector := docQuery.Find("div.whole-article-wrap").First(); selector.Size() <= 0 { docQuery.Find("body").Children().WrapAllHtml("

") } //解决文档内容缺少包裹标签的问题 if selector := docQuery.Find("div.markdown-article").First(); selector.Size() <= 0 { if selector := docQuery.Find("div.markdown-toc").First(); selector.Size() > 0 { docQuery.Find("div.markdown-toc").NextAll().WrapAllHtml("

") } } if html, err := docQuery.Html(); err == nil { return strings.TrimSuffix(strings.TrimPrefix(strings.TrimSpace(html), ""), "") } } return html }