Rename PROXY_* options to MEDIA_PROXY_*

internal/mediaproxy/rewriter.go

@@ -0,0 +1,113 @@
+// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package mediaproxy // import "miniflux.app/v2/internal/mediaproxy"
+
+import (
+	"strings"
+
+	"miniflux.app/v2/internal/config"
+	"miniflux.app/v2/internal/reader/sanitizer"
+	"miniflux.app/v2/internal/urllib"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/gorilla/mux"
+)
+
+type urlProxyRewriter func(router *mux.Router, url string) string
+
+func RewriteDocumentWithRelativeProxyURL(router *mux.Router, htmlDocument string) string {
+	return genericProxyRewriter(router, ProxifyRelativeURL, htmlDocument)
+}
+
+func RewriteDocumentWithAbsoluteProxyURL(router *mux.Router, host, htmlDocument string) string {
+	proxifyFunction := func(router *mux.Router, url string) string {
+		return ProxifyAbsoluteURL(router, host, url)
+	}
+	return genericProxyRewriter(router, proxifyFunction, htmlDocument)
+}
+
+func genericProxyRewriter(router *mux.Router, proxifyFunction urlProxyRewriter, htmlDocument string) string {
+	proxyOption := config.Opts.MediaProxyMode()
+	if proxyOption == "none" {
+		return htmlDocument
+	}
+
+	doc, err := goquery.NewDocumentFromReader(strings.NewReader(htmlDocument))
+	if err != nil {
+		return htmlDocument
+	}
+
+	for _, mediaType := range config.Opts.MediaProxyResourceTypes() {
+		switch mediaType {
+		case "image":
+			doc.Find("img, picture source").Each(func(i int, img *goquery.Selection) {
+				if srcAttrValue, ok := img.Attr("src"); ok {
+					if shouldProxy(srcAttrValue, proxyOption) {
+						img.SetAttr("src", proxifyFunction(router, srcAttrValue))
+					}
+				}
+
+				if srcsetAttrValue, ok := img.Attr("srcset"); ok {
+					proxifySourceSet(img, router, proxifyFunction, proxyOption, srcsetAttrValue)
+				}
+			})
+
+			doc.Find("video").Each(func(i int, video *goquery.Selection) {
+				if posterAttrValue, ok := video.Attr("poster"); ok {
+					if shouldProxy(posterAttrValue, proxyOption) {
+						video.SetAttr("poster", proxifyFunction(router, posterAttrValue))
+					}
+				}
+			})
+
+		case "audio":
+			doc.Find("audio, audio source").Each(func(i int, audio *goquery.Selection) {
+				if srcAttrValue, ok := audio.Attr("src"); ok {
+					if shouldProxy(srcAttrValue, proxyOption) {
+						audio.SetAttr("src", proxifyFunction(router, srcAttrValue))
+					}
+				}
+			})
+
+		case "video":
+			doc.Find("video, video source").Each(func(i int, video *goquery.Selection) {
+				if srcAttrValue, ok := video.Attr("src"); ok {
+					if shouldProxy(srcAttrValue, proxyOption) {
+						video.SetAttr("src", proxifyFunction(router, srcAttrValue))
+					}
+				}
+
+				if posterAttrValue, ok := video.Attr("poster"); ok {
+					if shouldProxy(posterAttrValue, proxyOption) {
+						video.SetAttr("poster", proxifyFunction(router, posterAttrValue))
+					}
+				}
+			})
+		}
+	}
+
+	output, err := doc.Find("body").First().Html()
+	if err != nil {
+		return htmlDocument
+	}
+
+	return output
+}
+
+func proxifySourceSet(element *goquery.Selection, router *mux.Router, proxifyFunction urlProxyRewriter, proxyOption, srcsetAttrValue string) {
+	imageCandidates := sanitizer.ParseSrcSetAttribute(srcsetAttrValue)
+
+	for _, imageCandidate := range imageCandidates {
+		if shouldProxy(imageCandidate.ImageURL, proxyOption) {
+			imageCandidate.ImageURL = proxifyFunction(router, imageCandidate.ImageURL)
+		}
+	}
+
+	element.SetAttr("srcset", imageCandidates.String())
+}
+
+func shouldProxy(attrValue, proxyOption string) bool {
+	return !strings.HasPrefix(attrValue, "data:") &&
+		(proxyOption == "all" || !urllib.IsHTTPS(attrValue))
+}