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// Copyright 2020 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 proxy // import "miniflux.app/proxy"
import (
"regexp"
"strings"
"miniflux.app/config"
"miniflux.app/url"
"github.com/PuerkitoBio/goquery"
"github.com/gorilla/mux"
)
var regexSplitSrcset = regexp.MustCompile(`,\s+`)
// ImageProxyRewriter replaces image URLs with internal proxy URLs.
func ImageProxyRewriter(router *mux.Router, data string) string {
proxyImages := config.Opts.ProxyImages()
if proxyImages == "none" {
return data
}
doc, err := goquery.NewDocumentFromReader(strings.NewReader(data))
if err != nil {
return data
}
doc.Find("img").Each(func(i int, img *goquery.Selection) {
if srcAttr, ok := img.Attr("src"); ok {
if !isDataURL(srcAttr) && (proxyImages == "all" || !url.IsHTTPS(srcAttr)) {
img.SetAttr("src", ProxifyURL(router, srcAttr))
}
}
if srcsetAttr, ok := img.Attr("srcset"); ok {
if proxyImages == "all" || !url.IsHTTPS(srcsetAttr) {
proxifySourceSet(img, router, srcsetAttr)
}
}
})
doc.Find("picture source").Each(func(i int, sourceElement *goquery.Selection) {
if srcsetAttr, ok := sourceElement.Attr("srcset"); ok {
if proxyImages == "all" || !url.IsHTTPS(srcsetAttr) {
proxifySourceSet(sourceElement, router, srcsetAttr)
}
}
})
output, err := doc.Find("body").First().Html()
if err != nil {
return data
}
return output
}
func proxifySourceSet(element *goquery.Selection, router *mux.Router, attributeValue string) {
var proxifiedSources []string
for _, source := range regexSplitSrcset.Split(attributeValue, -1) {
parts := strings.Split(strings.TrimSpace(source), " ")
nbParts := len(parts)
if nbParts > 0 {
rewrittenSource := parts[0]
if !isDataURL(rewrittenSource) {
rewrittenSource = ProxifyURL(router, rewrittenSource)
}
if nbParts > 1 {
rewrittenSource += " " + parts[1]
}
proxifiedSources = append(proxifiedSources, rewrittenSource)
}
}
if len(proxifiedSources) > 0 {
element.SetAttr("srcset", strings.Join(proxifiedSources, ", "))
}
}
func isDataURL(s string) bool {
return strings.HasPrefix(s, "data:")
}
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