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Simplify and optimize genericProxyRewriter 

- Reduce the amount of nested loops: it's preferable to search the whole page
  once and filter on it (even with filters that should always be false),
  than searching it again for every element we're looking for.
- Factorize the proxying conditions into a `shouldProxy` function to reduce the
  copy-pasta.
This commit is contained in:
jvoisin 2024-03-03 23:39:24 +01:00 committed by Frédéric Guillot
parent b8df6c31a0
commit 9fe99ce7fa
1 changed files with 12 additions and 33 deletions
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45
internal/proxy/media_proxy.go
View File

@ -43,9 +43,9 @@ func genericProxyRewriter(router *mux.Router, proxifyFunction urlProxyRewriter,
for _, mediaType := range config.Opts.ProxyMediaTypes() {
switch mediaType {
case "image":
doc.Find("img").Each(func(i int, img *goquery.Selection) {
doc.Find("img, picture source").Each(func(i int, img *goquery.Selection) {
if srcAttrValue, ok := img.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(srcAttrValue)) {
if shouldProxy(srcAttrValue, proxyOption) {
img.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
@ -55,59 +55,37 @@ func genericProxyRewriter(router *mux.Router, proxifyFunction urlProxyRewriter,
}
})
doc.Find("picture source").Each(func(i int, sourceElement *goquery.Selection) {
if srcsetAttrValue, ok := sourceElement.Attr("srcset"); ok {
proxifySourceSet(sourceElement, router, proxifyFunction, proxyOption, srcsetAttrValue)
}
})
doc.Find("video").Each(func(i int, video *goquery.Selection) {
if posterAttrValue, ok := video.Attr("poster"); ok {
if !isDataURL(posterAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(posterAttrValue)) {
if shouldProxy(posterAttrValue, proxyOption) {
video.SetAttr("poster", proxifyFunction(router, posterAttrValue))
}
}
})
case "audio":
doc.Find("audio").Each(func(i int, audio *goquery.Selection) {
doc.Find("audio, audio source").Each(func(i int, audio *goquery.Selection) {
if srcAttrValue, ok := audio.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(srcAttrValue)) {
if shouldProxy(srcAttrValue, proxyOption) {
audio.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
})
doc.Find("audio source").Each(func(i int, sourceElement *goquery.Selection) {
if srcAttrValue, ok := sourceElement.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(srcAttrValue)) {
sourceElement.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
})
case "video":
doc.Find("video").Each(func(i int, video *goquery.Selection) {
doc.Find("video, video source").Each(func(i int, video *goquery.Selection) {
if srcAttrValue, ok := video.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(srcAttrValue)) {
if shouldProxy(srcAttrValue, proxyOption) {
video.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
if posterAttrValue, ok := video.Attr("poster"); ok {
if !isDataURL(posterAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(posterAttrValue)) {
if shouldProxy(posterAttrValue, proxyOption) {
video.SetAttr("poster", proxifyFunction(router, posterAttrValue))
}
}
})
doc.Find("video source").Each(func(i int, sourceElement *goquery.Selection) {
if srcAttrValue, ok := sourceElement.Attr("src"); ok {
if !isDataURL(srcAttrValue) && (proxyOption == "all" || !urllib.IsHTTPS(srcAttrValue)) {
sourceElement.SetAttr("src", proxifyFunction(router, srcAttrValue))
}
}
})
}
}
@ -123,7 +101,7 @@ func proxifySourceSet(element *goquery.Selection, router *mux.Router, proxifyFun
imageCandidates := sanitizer.ParseSrcSetAttribute(srcsetAttrValue)
for _, imageCandidate := range imageCandidates {
if !isDataURL(imageCandidate.ImageURL) && (proxyOption == "all" || !urllib.IsHTTPS(imageCandidate.ImageURL)) {
if shouldProxy(imageCandidate.ImageURL, proxyOption) {
imageCandidate.ImageURL = proxifyFunction(router, imageCandidate.ImageURL)
}
}
@ -131,6 +109,7 @@ func proxifySourceSet(element *goquery.Selection, router *mux.Router, proxifyFun
element.SetAttr("srcset", imageCandidates.String())
}
func isDataURL(s string) bool {
return strings.HasPrefix(s, "data:")
func shouldProxy(attrValue, proxyOption string) bool {
return !strings.HasPrefix(attrValue, "data:") &&
(proxyOption == "all" || !urllib.IsHTTPS(attrValue))
}