move handling of Iframely options URL value from the cloud to WordPress itself

Author: iparamonau

app/Embed/Gutenberg.php

@@ -15,6 +15,10 @@ public static function run(): void
 
     public static function init(): void
     {
+        # Always extract &iframely={serialized options} that we append to URLs 
+        # and add these options into the oEmbed endpoint's query-string parameters
+        add_filter('oembed_fetch_url', [self::class, 'maybe_add_iframely_url_options'], 20, 3);
+
         if (!current_user_can('edit_posts')) {
             return;
         }
@@ -58,6 +62,29 @@ public static function maybe_add_gutenberg_1($provider, $url, $args)
         return $provider;
     }
 
+    public static function maybe_add_iframely_url_options($provider, $url, $args)
+    {
+        # Options are added to URL the URL in utils.js this way:
+        # 'iframely=' + encodeURIComponent(window.btoa(JSON.stringify(query)));
+        if (Utils::stringContains($provider, 'iframe.ly') && Utils::stringContains($url, 'iframely=')) {
+            $parsed_url = parse_url($url);
+            if (isset($parsed_url['query'])) {
+                $params = array();
+                parse_str($parsed_url['query'], $params);
+
+                if (isset($params['iframely'])) {
+                    $options_str = base64_decode(urldecode($params['iframely']));
+                    $options_query = json_decode($options_str);
+
+                    foreach($options_query as $key => $value) {
+                        $provider = add_query_arg($key, $value, $provider);
+                    }
+                }
+            }
+        }
+        return $provider;
+    }
+
     public static function inject_events_proxy_to_gutenberg($html, $url, $args)
     {
         $html = str_replace('"//cdn.iframe.ly', '"https://cdn.iframe.ly', $html);