feat: add document options `is_image`

src/classes/entities/class-tainacan-item.php

@@ -719,10 +719,8 @@ class Item extends Entity {
 
 				if ( $document_options && isset($document_options['forced_iframe']) && $document_options['forced_iframe'] === true ) {
 
-					$headers = get_headers($url, 1);
-
 					// URL points to an image file
-					if (strpos($headers['Content-Type'], 'image/') !== false) {
+					if (isset($document_options['is_image']) && $document_options['is_image'] === true) {
 						$_embed = sprintf('<a href="%s" target="blank"><img src="%s" /></a>', $url, $url);
 
 					// URL points to a content that is not an image

src/classes/repositories/class-tainacan-items.php

@@ -117,6 +117,13 @@ class Items extends Repository {
 						'context'     => array( 'view', 'edit', 'embed' ),
 						'default'     => false
 					),
+					'is_image' => array(
+						'title' => __( 'Is link to external image', 'tainacan' ),
+						'description' => __( 'Is link to external image', 'tainacan' ),
+						'type'        => 'boolean',
+						'context'     => array( 'view', 'edit', 'embed' ),
+						'default'     => false
+					),
 					'forced_iframe_height'      => array(
 						'description' => __( 'Iframe height (px)', 'tainacan' ),
 						'type'        => 'number',