84 lines
2.6 KiB
Go
84 lines
2.6 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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"strings"
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"miniflux.app/config"
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"miniflux.app/reader/sanitizer"
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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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type urlProxyRewriter func(router *mux.Router, url string) string
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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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return genericImageProxyRewriter(router, ProxifyURL, data)
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}
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// AbsoluteImageProxyRewriter do the same as ImageProxyRewriter except it uses absolute URLs.
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func AbsoluteImageProxyRewriter(router *mux.Router, host, data string) string {
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proxifyFunction := func(router *mux.Router, url string) string {
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return AbsoluteProxifyURL(router, host, url)
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}
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return genericImageProxyRewriter(router, proxifyFunction, data)
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}
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func genericImageProxyRewriter(router *mux.Router, proxifyFunction urlProxyRewriter, 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 srcAttrValue, ok := img.Attr("src"); ok {
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if !isDataURL(srcAttrValue) && (proxyImages == "all" || !url.IsHTTPS(srcAttrValue)) {
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img.SetAttr("src", proxifyFunction(router, srcAttrValue))
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}
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}
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if srcsetAttrValue, ok := img.Attr("srcset"); ok {
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proxifySourceSet(img, router, proxifyFunction, proxyImages, srcsetAttrValue)
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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 srcsetAttrValue, ok := sourceElement.Attr("srcset"); ok {
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proxifySourceSet(sourceElement, router, proxifyFunction, proxyImages, srcsetAttrValue)
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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, proxifyFunction urlProxyRewriter, proxyImages, srcsetAttrValue string) {
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imageCandidates := sanitizer.ParseSrcSetAttribute(srcsetAttrValue)
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for _, imageCandidate := range imageCandidates {
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if !isDataURL(imageCandidate.ImageURL) && (proxyImages == "all" || !url.IsHTTPS(imageCandidate.ImageURL)) {
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imageCandidate.ImageURL = proxifyFunction(router, imageCandidate.ImageURL)
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}
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}
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element.SetAttr("srcset", imageCandidates.String())
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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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