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c8f7a2a544
fixes #850 1. 修复文档为空附件不能下载 2. 修复文档设置为非markdown编辑附件不能下载 3. 兼容现存问题文档 4. 非markdown编辑文档，阅读时增加文档修改信息
129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
package utils
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import (
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"bytes"
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"regexp"
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"strings"
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"github.com/PuerkitoBio/goquery"
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"github.com/mindoc-org/mindoc/conf"
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)
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func StripTags(s string) string {
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//将HTML标签全转换成小写
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re, _ := regexp.Compile("\\<[\\S\\s]+?\\>")
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src := re.ReplaceAllStringFunc(s, strings.ToLower)
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//去除STYLE
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re, _ = regexp.Compile("\\<style[\\S\\s]+?\\</style\\>")
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src = re.ReplaceAllString(src, "")
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//去除SCRIPT
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re, _ = regexp.Compile("\\<script[\\S\\s]+?\\</script\\>")
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src = re.ReplaceAllString(src, "")
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//去除所有尖括号内的HTML代码，并换成换行符
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re, _ = regexp.Compile("\\<[\\S\\s]+?\\>")
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src = re.ReplaceAllString(src, "\n")
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//去除连续的换行符
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re, _ = regexp.Compile("\\s{2,}")
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src = re.ReplaceAllString(src, "\n")
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return src
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}
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//自动提取文章摘要
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func AutoSummary(body string, l int) string {
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//匹配图片，如果图片语法是在代码块中，这里同样会处理
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re := regexp.MustCompile(`<p>(.*?)</p>`)
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contents := re.FindAllString(body, -1)
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if len(contents) <= 0 {
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return ""
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}
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content := ""
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for _, s := range contents {
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b := strings.Replace(StripTags(s), "\n", "", -1)
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if l <= 0 {
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break
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}
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l = l - len([]rune(b))
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content += b
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}
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return content
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}
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//安全处理HTML文档，过滤危险标签和属性.
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func SafetyProcessor(html string) string {
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//安全过滤，移除危险标签和属性
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if docQuery, err := goquery.NewDocumentFromReader(bytes.NewBufferString(html)); err == nil {
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docQuery.Find("script").Remove()
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docQuery.Find("form").Remove()
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docQuery.Find("link").Remove()
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docQuery.Find("applet").Remove()
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docQuery.Find("frame").Remove()
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docQuery.Find("meta").Remove()
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if !conf.GetEnableIframe() {
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docQuery.Find("iframe").Remove()
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}
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docQuery.Find("*").Each(func(i int, selection *goquery.Selection) {
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if href, ok := selection.Attr("href"); ok && strings.HasPrefix(href, "javascript:") {
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selection.SetAttr("href", "#")
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}
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if src, ok := selection.Attr("src"); ok && strings.HasPrefix(src, "javascript:") {
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selection.SetAttr("src", "#")
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}
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selection.RemoveAttr("onafterprint").
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RemoveAttr("onbeforeprint").
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RemoveAttr("onbeforeunload").
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RemoveAttr("onload").
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RemoveAttr("onclick").
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RemoveAttr("onkeydown").
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RemoveAttr("onkeypress").
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RemoveAttr("onkeyup").
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RemoveAttr("ondblclick").
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RemoveAttr("onmousedown").
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RemoveAttr("onmousemove").
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RemoveAttr("onmouseout").
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RemoveAttr("onmouseover").
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RemoveAttr("onmouseup")
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})
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//处理外链
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docQuery.Find("a").Each(func(i int, contentSelection *goquery.Selection) {
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if src, ok := contentSelection.Attr("href"); ok {
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if strings.HasPrefix(src, "http://") || strings.HasPrefix(src, "https://") {
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if conf.BaseUrl != "" && !strings.HasPrefix(src, conf.BaseUrl) {
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contentSelection.SetAttr("target", "_blank")
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}
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}
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}
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})
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//添加文档标签包裹
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if selector := docQuery.Find("div.whole-article-wrap").First(); selector.Size() <= 0 {
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docQuery.Find("body").Children().WrapAllHtml("<div class=\"whole-article-wrap\"></div>")
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}
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//解决文档内容缺少包裹标签的问题
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if selector := docQuery.Find("div.markdown-article").First(); selector.Size() <= 0 {
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if selector := docQuery.Find("div.markdown-toc").First(); selector.Size() > 0 {
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docQuery.Find("div.markdown-toc").NextAll().WrapAllHtml("<div class=\"markdown-article\"></div>")
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}
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}
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if html, err := docQuery.Html(); err == nil {
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return strings.TrimSuffix(strings.TrimPrefix(strings.TrimSpace(html), "<html><head></head><body>"), "</body></html>")
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}
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}
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return html
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}
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