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miniflux/proxy/image_proxy.go
2022-10-27 17:33:18 -07:00

84 lines
2.6 KiB
Go

// 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 (
"strings"
"miniflux.app/config"
"miniflux.app/reader/sanitizer"
"miniflux.app/url"
"github.com/PuerkitoBio/goquery"
"github.com/gorilla/mux"
)
type urlProxyRewriter func(router *mux.Router, url string) string
// ImageProxyRewriter replaces image URLs with internal proxy URLs.
func ImageProxyRewriter(router *mux.Router, data string) string {
return genericImageProxyRewriter(router, ProxifyURL, data)
}
// AbsoluteImageProxyRewriter do the same as ImageProxyRewriter except it uses absolute URLs.
func AbsoluteImageProxyRewriter(router *mux.Router, host, data string) string {
proxifyFunction := func(router *mux.Router, url string) string {
return AbsoluteProxifyURL(router, host, url)
}
return genericImageProxyRewriter(router, proxifyFunction, data)
}
func genericImageProxyRewriter(router *mux.Router, proxifyFunction urlProxyRewriter, 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 srcAttrValue, ok := img.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyImages == "all" || !url.IsHTTPS(srcAttrValue)) {
img.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
if srcsetAttrValue, ok := img.Attr("srcset"); ok {
proxifySourceSet(img, router, proxifyFunction, proxyImages, srcsetAttrValue)
}
})
doc.Find("picture source").Each(func(i int, sourceElement *goquery.Selection) {
if srcsetAttrValue, ok := sourceElement.Attr("srcset"); ok {
proxifySourceSet(sourceElement, router, proxifyFunction, proxyImages, srcsetAttrValue)
}
})
output, err := doc.Find("body").First().Html()
if err != nil {
return data
}
return output
}
func proxifySourceSet(element *goquery.Selection, router *mux.Router, proxifyFunction urlProxyRewriter, proxyImages, srcsetAttrValue string) {
imageCandidates := sanitizer.ParseSrcSetAttribute(srcsetAttrValue)
for _, imageCandidate := range imageCandidates {
if !isDataURL(imageCandidate.ImageURL) && (proxyImages == "all" || !url.IsHTTPS(imageCandidate.ImageURL)) {
imageCandidate.ImageURL = proxifyFunction(router, imageCandidate.ImageURL)
}
}
element.SetAttr("srcset", imageCandidates.String())
}
func isDataURL(s string) bool {
return strings.HasPrefix(s, "data:")
}