Refactor video-util.ts and rename markdown-preview (#233)

* Refactor video-util.ts
* Rename markdown-preview to markdown-renderer and refactor some methods

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

src/components/editor/markdown-renderer/replace-components/vimeo/vimeo-frame.tsx

@@ -0,0 +1,54 @@
+import React, { useCallback } from 'react'
+import { ComponentReplacer } from '../../markdown-renderer'
+import { getAttributesFromCodiMdTag } from '../codi-md-tag-utils'
+import { OneClickEmbedding } from '../one-click-frame/one-click-embedding'
+
+const getElementReplacement:ComponentReplacer = (node, counterMap) => {
+  const attributes = getAttributesFromCodiMdTag(node, 'vimeo')
+  if (attributes && attributes.id) {
+    const videoId = attributes.id
+    const count = (counterMap.get(videoId) || 0) + 1
+    counterMap.set(videoId, count)
+    return <VimeoFrame key={`vimeo_${videoId}_${count}`} id={videoId}/>
+  }
+}
+
+interface VimeoApiResponse {
+  // Vimeo uses strange names for their fields. ESLint doesn't like that.
+  // eslint-disable-next-line camelcase
+  thumbnail_large?: string
+}
+
+export interface VimeoFrameProps {
+  id: string
+}
+
+export const VimeoFrame: React.FC<VimeoFrameProps> = ({ id }) => {
+  const getPreviewImageLink = useCallback(async () => {
+    const response = await fetch(`https://vimeo.com/api/v2/video/${id}.json`, {
+      credentials: 'omit',
+      referrerPolicy: 'no-referrer'
+    })
+    if (response.status !== 200) {
+      throw new Error('Error while loading data from vimeo api')
+    }
+    const vimeoResponse: VimeoApiResponse[] = await response.json() as VimeoApiResponse[]
+
+    if (vimeoResponse[0] && vimeoResponse[0].thumbnail_large) {
+      return vimeoResponse[0].thumbnail_large
+    } else {
+      throw new Error('Invalid vimeo response')
+    }
+  }, [id])
+
+  return (
+    <OneClickEmbedding containerClassName={'embed-responsive embed-responsive-16by9'} previewContainerClassName={'embed-responsive-item'} loadingImageUrl={'https://i.vimeocdn.com/video/'} hoverIcon={'vimeo-square'}
+      onImageFetch={getPreviewImageLink}>
+      <iframe className='embed-responsive-item' title={`vimeo video of ${id}`}
+        src={`https://player.vimeo.com/video/${id}?autoplay=1`}
+        allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"/>
+    </OneClickEmbedding>
+  )
+}
+
+export { getElementReplacement as getVimeoReplacement }