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markdowns.go
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markdowns.go
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// Pipe - A small and beautiful blogging platform written in golang.
// Copyright (C) 2017-2019, b3log.org & hacpai.com
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
import (
"crypto/md5"
"io/ioutil"
"net/http"
"regexp"
"strings"
"time"
"unicode"
"unicode/utf8"
"github.com/PuerkitoBio/goquery"
"github.com/bluele/gcache"
"github.com/hackebrot/turtle"
"github.com/microcosm-cc/bluemonday"
"github.com/vinta/pangu"
"gopkg.in/russross/blackfriday.v2"
)
var markdownCache = gcache.New(1024).LRU().Build()
// MarkdownResult represents markdown result.
type MarkdownResult struct {
ContentHTML string
AbstractText string
ThumbURL string
}
var MarkedAvailable = false
// LoadMarkdown loads markdown process engine.
func LoadMarkdown() {
request, err := http.NewRequest("POST", "http://localhost:8250", strings.NewReader("旧日的足迹"))
if nil != err {
logger.Info("[marked] is not available, uses built-in [blackfriday] for markdown processing")
return
}
http.DefaultClient.Timeout = 2 * time.Second
response, err := http.DefaultClient.Do(request)
if nil != err {
logger.Info("[marked] is not available, uses built-in [blackfriday] for markdown processing")
return
}
defer response.Body.Close()
data, err := ioutil.ReadAll(response.Body)
if nil != err {
logger.Info("[marked] is not available, uses built-in [blackfriday] for markdown processing")
return
}
content := string(data)
MarkedAvailable = "<p>旧日的足迹</p>\n" == content
if MarkedAvailable {
logger.Debug("[marked] is available, uses it for markdown processing")
} else {
logger.Debug("[marked] is not available, uses built-in [blackfriday] for markdown processing")
}
}
func marked(mdText string) []byte {
request, err := http.NewRequest("POST", "http://localhost:8250", strings.NewReader(mdText))
if nil != err {
logger.Info("marked failed: " + err.Error())
return []byte("")
}
http.DefaultClient.Timeout = time.Second
response, err := http.DefaultClient.Do(request)
if nil != err {
logger.Warnf("[marked] failed [err=" + err.Error() + "], uses built-in [blackfriday] instead")
return bf(mdText)
}
defer response.Body.Close()
ret, err := ioutil.ReadAll(response.Body)
if nil != err {
logger.Info("marked failed: " + err.Error() + ", try to use built-in md engine instead")
return bf(mdText)
}
return ret
}
func bf(mdText string) []byte {
return blackfriday.Run([]byte(mdText))
}
// Markdown process the specified markdown text to HTML.
func Markdown(mdText string) *MarkdownResult {
mdText = strings.Replace(mdText, "\r\n", "\n", -1)
digest := md5.New()
digest.Write([]byte(mdText))
key := string(digest.Sum(nil))
cached, err := markdownCache.Get(key)
if nil == err {
return cached.(*MarkdownResult)
}
mdText = emojify(mdText)
var unsafe []byte
if MarkedAvailable {
unsafe = marked(mdText)
} else {
unsafe = bf(mdText)
}
contentHTML := string(unsafe)
doc, _ := goquery.NewDocumentFromReader(strings.NewReader(contentHTML))
doc.Find("img").Each(func(i int, ele *goquery.Selection) {
src, _ := ele.Attr("src")
ele.SetAttr("data-src", src)
ele.RemoveAttr("src")
})
doc.Find("*").Contents().FilterFunction(func(i int, ele *goquery.Selection) bool {
if "#text" != goquery.NodeName(ele) {
return false
}
parent := goquery.NodeName(ele.Parent())
return "span" != parent && "code" != parent && "pre" != parent
}).Each(func(i int, ele *goquery.Selection) {
text := ele.Text()
text = pangu.SpacingText(text)
ele.ReplaceWithHtml(text)
})
if !MarkedAvailable {
doc.Find("code").Each(func(i int, ele *goquery.Selection) {
code, err := ele.Html()
if nil != err {
logger.Errorf("get element [%+v]' HTML failed: %s", ele, err)
} else {
code = strings.Replace(code, "<", "<", -1)
code = strings.Replace(code, ">", ">", -1)
ele.SetHtml(code)
}
})
}
contentHTML, _ = doc.Find("body").Html()
contentHTML = bluemonday.UGCPolicy().AllowAttrs("class").Matching(regexp.MustCompile("^language-[a-zA-Z0-9]+$")).OnElements("code").
AllowAttrs("data-src").OnElements("img").
AllowAttrs("class", "target", "id", "style").Globally().
AllowAttrs("src", "width", "height", "border", "marginwidth", "marginheight").OnElements("iframe").
AllowAttrs("controls", "src").OnElements("audio").
AllowAttrs("color").OnElements("font").
AllowAttrs("controls", "src", "width", "height").OnElements("video").
AllowAttrs("src", "media", "type").OnElements("source").
AllowAttrs("width", "height", "data", "type").OnElements("object").
AllowAttrs("name", "value").OnElements("param").
AllowAttrs("src", "type", "width", "height", "wmode", "allowNetworking").OnElements("embed").
Sanitize(contentHTML)
text := doc.Text()
var runes []rune
for i, w := 0, 0; i < len(text); i += w {
runeValue, width := utf8.DecodeRuneInString(text[i:])
w = width
if unicode.IsSpace(runeValue) {
continue
}
runes = append(runes, runeValue)
if 200 < len(runes) {
break
}
}
selection := doc.Find("img").First()
thumbnailURL, _ := selection.Attr("src")
if "" == thumbnailURL {
thumbnailURL, _ = selection.Attr("data-src")
}
abstractText := strings.TrimSpace(runesToString(runes))
abstractText = pangu.SpacingText(abstractText)
abstractText = strings.Replace(abstractText, "<", "<", -1)
abstractText = strings.Replace(abstractText, ">", ">", -1)
ret := &MarkdownResult{
ContentHTML: contentHTML,
AbstractText: abstractText,
ThumbURL: thumbnailURL,
}
markdownCache.Set(key, ret)
return ret
}
func runesToString(runes []rune) (ret string) {
for _, v := range runes {
ret += string(v)
}
return
}
var emojiRegx = regexp.MustCompile(":[a-z_]+:")
func emojify(text string) string {
return emojiRegx.ReplaceAllStringFunc(text, func(emojiASCII string) string {
emojiASCII = strings.Replace(emojiASCII, ":", "", -1)
emoji := turtle.Emojis[emojiASCII]
if nil == emoji {
//logger.Warn("not found [" + emojiASCII + "]")
return emojiASCII
}
return emoji.Char
})
}