Add configuration option to disable media proxy

Media proxy is enabled by default, and was always enabled before this
commit.

src/lib/constants.js

@@ -41,6 +41,11 @@ let constants = {
 	does_not_track: false,
 
 	allow_user_from_reel: "fallback", // one of: "never", "fallback", "prefer", "onlyPreferSaved", "preferForRSS"
+	proxy_media: { // Whether to proxy media (images, videos, thumbnails) through Bibliogram. This is strongly recommended to protect user privacy. If proxy is turned off, some browser content blockers may break all images since they are served from Facebook domains.
+		image: true,
+		video: true,
+		thumbnail: true
+	},
 
 	feeds: {
 		// Whether feeds are enabled.

src/lib/structures/TimelineBaseMethods.js

@@ -26,11 +26,15 @@ class TimelineBaseMethods {
 	}
 
 	getDisplayUrlP() {
-		return proxyImage(this.data.display_url)
+		let url = this.data.display_url
+		if (constants.proxy_media.image) url = proxyImage(url)
+		return url
 	}
 
 	getVideoUrlP() {
-		return proxyVideo(this.data.video_url)
+		let url = this.data.video_url
+		if (constants.proxy_media.video) url = proxyVideo(url)
+		return url
 	}
 
 	getAlt() {

src/lib/structures/TimelineEntry.js

@@ -154,7 +154,9 @@ class TimelineEntry extends TimelineBaseMethods {
 	getThumbnailSrcsetP() {
 		if (this.data.thumbnail_resources) {
 			return this.data.thumbnail_resources.map(tr => {
-				return `${proxyImage(tr.src, tr.config_width)} ${tr.config_width}w`
+				let src = tr.src
+				if (constants.proxy_media.thumbnail) src = proxyImage(tr.src, tr.config_width)
+				return `${src} ${tr.config_width}w`
 			}).join(", ")
 		} else {
 			return null
@@ -174,16 +176,20 @@ class TimelineEntry extends TimelineBaseMethods {
 				found = tr
 				if (tr.config_width >= size) break // don't proceed once we find one large enough
 			}
+			let src = found.src
+			if (constants.proxy_media.thumbnail) src = proxyImage(src, found.config_width) // force resize to config rather than requested
 			return {
 				config_width: found.config_width,
 				config_height: found.config_height,
-				src: proxyImage(found.src, found.config_width) // force resize to config rather than requested
+				src
 			}
 		} else if (this.data.thumbnail_src) {
+			let src = this.data.thumbnail_src
+			if (constants.proxy_media.thumbnail) src = proxyImage(src, size) // force resize to requested
 			return {
 				config_width: size, // probably?
 				config_height: size,
-				src: proxyImage(this.data.thumbnail_src, size) // force resize to requested
+				src
 			}
 		} else {
 			return null