90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2020 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package proxy // import "miniflux.app/proxy"
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import (
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"regexp"
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"strings"
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"miniflux.app/config"
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"miniflux.app/url"
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"github.com/PuerkitoBio/goquery"
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"github.com/gorilla/mux"
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)
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var regexSplitSrcset = regexp.MustCompile(`,\s+`)
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// ImageProxyRewriter replaces image URLs with internal proxy URLs.
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func ImageProxyRewriter(router *mux.Router, data string) string {
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proxyImages := config.Opts.ProxyImages()
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if proxyImages == "none" {
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return data
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}
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doc, err := goquery.NewDocumentFromReader(strings.NewReader(data))
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if err != nil {
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return data
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}
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doc.Find("img").Each(func(i int, img *goquery.Selection) {
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if srcAttr, ok := img.Attr("src"); ok {
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if !isDataURL(srcAttr) && (proxyImages == "all" || !url.IsHTTPS(srcAttr)) {
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img.SetAttr("src", ProxifyURL(router, srcAttr))
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}
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}
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if srcsetAttr, ok := img.Attr("srcset"); ok {
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if proxyImages == "all" || !url.IsHTTPS(srcsetAttr) {
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proxifySourceSet(img, router, srcsetAttr)
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}
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}
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})
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doc.Find("picture source").Each(func(i int, sourceElement *goquery.Selection) {
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if srcsetAttr, ok := sourceElement.Attr("srcset"); ok {
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if proxyImages == "all" || !url.IsHTTPS(srcsetAttr) {
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proxifySourceSet(sourceElement, router, srcsetAttr)
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}
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}
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})
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output, err := doc.Find("body").First().Html()
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if err != nil {
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return data
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}
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return output
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}
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func proxifySourceSet(element *goquery.Selection, router *mux.Router, attributeValue string) {
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var proxifiedSources []string
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for _, source := range regexSplitSrcset.Split(attributeValue, -1) {
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parts := strings.Split(strings.TrimSpace(source), " ")
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nbParts := len(parts)
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if nbParts > 0 {
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rewrittenSource := parts[0]
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if !isDataURL(rewrittenSource) {
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rewrittenSource = ProxifyURL(router, rewrittenSource)
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}
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if nbParts > 1 {
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rewrittenSource += " " + parts[1]
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}
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proxifiedSources = append(proxifiedSources, rewrittenSource)
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}
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}
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if len(proxifiedSources) > 0 {
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element.SetAttr("srcset", strings.Join(proxifiedSources, ", "))
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}
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}
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func isDataURL(s string) bool {
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return strings.HasPrefix(s, "data:")
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}
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