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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package rewrite // import "miniflux.app/reader/rewrite"
import (
"fmt"
"html"
"net/url"
"regexp"
"strings"
"github.com/PuerkitoBio/goquery"
)
var (
youtubeRegex = regexp.MustCompile(`youtube\.com/watch\?v=(.*)`)
imgRegex = regexp.MustCompile(`<img [^>]+>`)
textLinkRegex = regexp.MustCompile(`(?mi)(\bhttps?:\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])`)
)
func addImageTitle(entryURL, entryContent string) string {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(entryContent))
if err != nil {
return entryContent
}
matches := doc.Find("img[src][title]")
if matches.Length() > 0 {
matches.Each(func(i int, img *goquery.Selection) {
altAttr := img.AttrOr("alt", "")
srcAttr, _ := img.Attr("src")
titleAttr, _ := img.Attr("title")
img.ReplaceWithHtml(`<figure><img src="` + srcAttr + `" alt="` + altAttr + `"/><figcaption><p>` + html.EscapeString(titleAttr) + `</p></figcaption></figure>`)
})
output, _ := doc.Find("body").First().Html()
return output
}
return entryContent
}
func addMailtoSubject(entryURL, entryContent string) string {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(entryContent))
if err != nil {
return entryContent
}
matches := doc.Find(`a[href^="mailto:"]`)
if matches.Length() > 0 {
matches.Each(func(i int, a *goquery.Selection) {
hrefAttr, _ := a.Attr("href")
mailto, err := url.Parse(hrefAttr)
if err != nil {
return
}
subject := mailto.Query().Get("subject")
if subject == "" {
return
}
a.AppendHtml(" [" + html.EscapeString(subject) + "]")
})
output, _ := doc.Find("body").First().Html()
return output
}
return entryContent
}
func addDynamicImage(entryURL, entryContent string) string {
doc, err := goquery.NewDocumentFromReader(strings.NewReader(entryContent))
if err != nil {
return entryContent
}
// Ordered most preferred to least preferred.
candidateAttrs := []string{
"data-src",
"data-original",
"data-orig",
"data-url",
"data-orig-file",
"data-large-file",
"data-medium-file",
"data-2000src",
"data-1000src",
"data-800src",
"data-655src",
"data-500src",
"data-380src",
}
changed := false
doc.Find("img,div").Each(func(i int, img *goquery.Selection) {
for _, candidateAttr := range candidateAttrs {
if srcAttr, found := img.Attr(candidateAttr); found {
changed = true
if img.Is("img") {
img.SetAttr("src", srcAttr)
} else {
altAttr := img.AttrOr("alt", "")
img.ReplaceWithHtml(`<img src="` + srcAttr + `" alt="` + altAttr + `"/>`)
}
break
}
}
})
if !changed {
doc.Find("noscript").Each(func(i int, noscript *goquery.Selection) {
matches := imgRegex.FindAllString(noscript.Text(), 2)
if len(matches) == 1 {
changed = true
noscript.ReplaceWithHtml(matches[0])
}
})
}
if changed {
output, _ := doc.Find("body").First().Html()
return output
}
return entryContent
}
func addYoutubeVideo(entryURL, entryContent string) string {
matches := youtubeRegex.FindStringSubmatch(entryURL)
if len(matches) == 2 {
video := `<iframe width="650" height="350" frameborder="0" src="https://www.youtube-nocookie.com/embed/` + matches[1] + `" allowfullscreen></iframe>`
return video + "<p>" + replaceLineFeeds(replaceTextLinks(entryContent)) + "</p>"
}
return entryContent
}
func addPDFLink(entryURL, entryContent string) string {
if strings.HasSuffix(entryURL, ".pdf") {
return fmt.Sprintf(`<a href="%s">PDF</a><br>%s`, entryURL, entryContent)
}
return entryContent
}
func replaceTextLinks(input string) string {
return textLinkRegex.ReplaceAllString(input, `<a href="${1}">${1}</a>`)
}
func replaceLineFeeds(input string) string {
return strings.Replace(input, "\n", "<br>", -1)
}
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