Fixes embeds for youtube channels (#169)

src/lib/extractYoutubeMeta.ts

@@ -4,10 +4,12 @@ export const extractYoutubeMeta = (html: string): Record<string, string> => {
   const youtubeDescriptionRegex =
     /"videoDetails":.*"shortDescription":"([^"]*)"/i
   const youtubeThumbnailRegex = /"videoDetails":.*"url":"(.*)(default\.jpg)/i
-
+  const youtubeAvatarRegex =
+    /"avatar":{"thumbnails":\[{.*?url.*?url.*?url":"([^"]*)"/i
   const youtubeTitleMatch = youtubeTitleRegex.exec(html)
   const youtubeDescriptionMatch = youtubeDescriptionRegex.exec(html)
   const youtubeThumbnailMatch = youtubeThumbnailRegex.exec(html)
+  const youtubeAvatarMatch = youtubeAvatarRegex.exec(html)
 
   if (youtubeTitleMatch && youtubeTitleMatch.length >= 1) {
     res.title = decodeURI(youtubeTitleMatch[1])
@@ -21,6 +23,9 @@ export const extractYoutubeMeta = (html: string): Record<string, string> => {
   if (youtubeThumbnailMatch && youtubeThumbnailMatch.length >= 2) {
     res.image = youtubeThumbnailMatch[1] + 'default.jpg'
   }
+  if (!res.image && youtubeAvatarMatch && youtubeAvatarMatch.length >= 1) {
+    res.image = youtubeAvatarMatch[1]
+  }
 
   return res
 }