refactor(editor): add image proxy for privacy (serlo-only)

packages/editor/src/plugins/dropzone-image/components/answer-zone/answer-content.tsx

@@ -1,3 +1,4 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
 import { StaticSlate } from '@editor/plugins/text/static-components/static-slate'
 import { cn } from '@editor/utils/cn'
 import React from 'react'
@@ -14,7 +15,7 @@ export function AnswerContent(props: AnswerContentProps) {
 
   if (url) {
     return (
-      <img
+      <EditorImage
         data-qa="plugin-dropzone-image-answer-content-image"
         src={url}
         className={cn('h-full w-full object-contain', className)}

packages/editor/src/plugins/image-gallery/components/image-grid.tsx

@@ -1,3 +1,4 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
 import { cn } from '@editor/utils/cn'
 
 import { GridImage } from '../types'
@@ -35,7 +36,7 @@ export function ImageGrid({
               style={isLastImage ? {} : getFlex(leftImage)}
             >
               <button onClick={() => onImageClick(index)}>
-                <img
+                <EditorImage
                   src={leftImage.src}
                   alt={leftImage.alt}
                   className={cn(isLastImage && 'max-h-96')}
@@ -47,7 +48,10 @@ export function ImageGrid({
             {rightImage ? (
               <div className="group relative" style={getFlex(rightImage)}>
                 <button onClick={() => onImageClick(rightIndex)}>
-                  <img src={rightImage.src} alt={`Image ${rightImage.src}`} />
+                  <EditorImage
+                    src={rightImage.src}
+                    alt={`Image ${rightImage.src}`}
+                  />
                 </button>
                 {extraChildren?.[rightIndex]}
                 {renderHoverOverlay(rightImage.caption, rightIndex)}

packages/editor/src/plugins/image-gallery/components/static/static-carousel.tsx

@@ -1,3 +1,5 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
+
 import { GridImage } from '../../types'
 
 interface StaticCarouselProps {
@@ -14,7 +16,7 @@ export function StaticCarousel({ images, onImageClick }: StaticCarouselProps) {
           className="w-full flex-shrink-0 snap-center snap-always text-center"
           onClick={() => onImageClick(index)}
         >
-          <img src={src} alt={alt} />
+          <EditorImage src={src} alt={alt} />
           <div className="mt-3">
             {caption ? (
               <div className="italic text-gray-700 [&_a]:text-brand-400">

packages/editor/src/plugins/image-gallery/components/static/static-lightbox-carousel.tsx

@@ -1,3 +1,4 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
 import { UIEvent, useEffect, useRef } from 'react'
 
 import { GridImage } from '../../types'
@@ -37,7 +38,7 @@ export function StaticLightboxCarousel({
           key={index}
           className="w-full flex-shrink-0 snap-center snap-always text-center"
         >
-          <img src={src} alt={alt} />
+          <EditorImage src={src} alt={alt} />
           <div className="mt-3">
             {caption ? (
               <div className="italic text-gray-100 [&_a]:text-brand-400">

packages/editor/src/plugins/image-gallery/components/static/static-lightbox-image.tsx

@@ -1,13 +1,15 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
+
 import { GridImage } from '../../types'
 
 export function StaticLightboxImage({ caption, src, alt }: GridImage) {
   if (!caption) {
-    return <img src={src} className="max-h-[60vh] bg-white" />
+    return <EditorImage src={src} className="max-h-[60vh] bg-white" />
   }
 
   return (
     <div className="text-center">
-      <img src={src} alt={alt} className="max-h-[60vh] bg-white" />
+      <EditorImage src={src} alt={alt} className="max-h-[60vh] bg-white" />
       <div className="mt-3 italic text-gray-100 [&_a]:text-brand-400">
         {caption}
       </div>

packages/editor/src/plugins/image-gallery/components/static/static-lightbox-thumbnail.tsx

@@ -1,3 +1,4 @@
+import { EditorImage } from '@editor/plugins/image/components/editor-image'
 import { cn } from '@editor/utils/cn'
 
 import type { GridImage } from '../../types'
@@ -17,7 +18,7 @@ export function StaticLightboxThumbnail({
 
   return (
     <button className="group relative" onClick={onClick}>
-      <img src={src} alt={alt} className="max-h-[120px] bg-white" />
+      <EditorImage src={src} alt={alt} className="max-h-[120px] bg-white" />
       <div
         className={cn(
           'absolute inset-0 bg-black bg-opacity-70 group-hover:block',

packages/editor/src/plugins/image/components/editor-image.tsx

@@ -0,0 +1,25 @@
+import { serloDomain } from '@editor/utils/serlo-domain'
+import { SerloOnlyFeaturesContext } from '@editor/utils/serlo-extra-context'
+import { ImgHTMLAttributes, useContext } from 'react'
+
+/**
+ * Proxies external editor images via cloudflare worker
+ * Temporary fix for privacy reasons. Long term we want to upload
+ * images to our own bucket instead
+ */
+export function EditorImage(props: ImgHTMLAttributes<HTMLImageElement>) {
+  const isSerlo = useContext(SerloOnlyFeaturesContext).isSerlo
+  return <img {...props} src={getSrc(isSerlo, props.src)} />
+}
+
+function getSrc(isSerlo?: boolean, src?: string) {
+  if (!isSerlo || !src) return src
+
+  const isAllowed =
+    src.startsWith('https://assets.serlo.org/') ||
+    src.startsWith('https://pixabay.com/')
+
+  if (isAllowed) return src
+
+  return `https://asset-proxy.${serloDomain}/src?url=${encodeURIComponent(src)}`
+}

packages/editor/src/plugins/image/renderer.tsx

@@ -1,5 +1,7 @@
 import { useStaticStrings } from '@editor/i18n/static-strings-provider'
 
+import { EditorImage } from './components/editor-image'
+
 interface ImageProps {
   image: {
     src: string
@@ -31,7 +33,7 @@ export function ImageRenderer({
       <div style={{ maxWidth }} className="mx-auto">
         {wrapWithLink(
           placeholder ?? (
-            <img
+            <EditorImage
               className="serlo-img"
               src={src}
               alt={alt ? alt : altFallbackString}