youtube: an option to fix EU redirects for YT shorts via a feature flag

Please configure  `fix_shorts_in_eu: true` - see example config file.

cc #543

config.local.js.SAMPLE

@@ -256,7 +256,8 @@ export default {
         youtube: {
             // api_key: "INSERT YOUR VALUE",
             // parts: [ "snippet", "player" ], // list of fields you want to use in the request, in most cases you only need those two
-            get_params: "?rel=0&showinfo=1"     // https://developers.google.com/youtube/player_parameters
+            get_params: "?rel=0&showinfo=1"     // https://developers.google.com/youtube/player_parameters,
+            fix_shorts_in_eu: true              // Avoid consent redirect for EU servers
         },
         vimeo: {
             get_params: "?byline=0&badge=0"     // https://developer.vimeo.com/player/embedding

lib/plugins/system/oembed/providers.json

@@ -168,6 +168,13 @@
         "url": "https://www.youtube.com/watch?v={1}",
         "endpoint": "https://www.youtube.com/oembed?format={format}&url={url}"
     },
+    {
+        "name": "YouTube Shorts",
+        "templates": [
+            "www\\.youtube\\.com/shorts/([a-zA-Z0-9_-]+)"
+        ],
+        "endpoint": "https://www.youtube.com/oembed"
+    },    
     {
         "name": "YouTube Playlist",
         "templates": [

plugins/domains/youtube.com/youtube.shorts.js

@@ -0,0 +1,34 @@
+/**
+ * This is an alternative fix for https://github.com/itteco/iframely/issues/543.
+ * If your servers are in EU, this avoids a redirect to cookie consents, 
+ * Activate it by addong 
+ */
+
+export default {
+
+    re: /^https?:\/\/www\.youtube\.com\/shorts\/([a-zA-Z0-9_-]+)/i,
+
+    // The issue with EU consent redirect needs to be bypassed 
+    // by avoiding htmlparser-dependent plugins and mixins.
+
+    notPlugin: !CONFIG.providerOptions?.youtube?.fix_shorts_in_eu,
+
+    mixins: [
+        "domain-icon",
+        "oembed-title",
+        "oembed-site",
+        "oembed-author",
+        "oembed-thumbnail",
+        "oembed-video", // "allow" attributes will be merged from there
+        "oembed-iframe"
+    ],
+
+    getLink: function(iframe) {
+        return {
+            href: iframe.src,
+            type: CONFIG.T.text_html,
+            rel: CONFIG.R.player,
+            "aspect-ratio": 9/16,
+        }
+    }
+};