Fixes youtube embed issues (#50)

* fixes youtube embed

* move extractMetaHtml test to its own file

* tests cleanup

* Add fallback for youtube meta data

* lint

* Check for youtube in the url domain

* use hostname instead of full url to check for link domain

* checks only for domain

src/lib/extractHtmlMeta.ts

@@ -0,0 +1,65 @@
+import {extractYoutubeMeta} from './extractYoutubeMeta'
+
+interface ExtractHtmlMetaInput {
+  html: string
+  hostname?: string
+}
+
+export const extractHtmlMeta = ({
+  html,
+  hostname,
+}: ExtractHtmlMetaInput): Record<string, string> => {
+  const htmlTitleRegex = /<title>([^<]+)<\/title>/i
+
+  let res: Record<string, string> = {}
+
+  const match = htmlTitleRegex.exec(html)
+
+  if (match) {
+    res.title = match[1].trim()
+  }
+
+  let metaMatch
+  let propMatch
+  const metaRe = /<meta[\s]([^>]+)>/gis
+  while ((metaMatch = metaRe.exec(html))) {
+    let propName
+    let propValue
+    const propRe = /(name|property|content)="([^"]+)"/gis
+    while ((propMatch = propRe.exec(metaMatch[1]))) {
+      if (propMatch[1] === 'content') {
+        propValue = propMatch[2]
+      } else {
+        propName = propMatch[2]
+      }
+    }
+    if (!propName || !propValue) {
+      continue
+    }
+    switch (propName?.trim()) {
+      case 'title':
+      case 'og:title':
+      case 'twitter:title':
+        res.title = propValue?.trim()
+        break
+      case 'description':
+      case 'og:description':
+      case 'twitter:description':
+        res.description = propValue?.trim()
+        break
+      case 'og:image':
+      case 'twitter:image':
+        res.image = propValue?.trim()
+        break
+    }
+  }
+
+  const isYoutubeUrl =
+    hostname?.includes('youtube.') || hostname?.includes('youtu.be')
+  if (isYoutubeUrl) {
+    // Workaround for Youtube not having a title in the meta tags
+    res = {...res, ...extractYoutubeMeta(html)}
+  }
+
+  return res
+}