1 files changed, 84 insertions, 0 deletions
diff --git a/plugins/jetpack/_inc/lib/class.jetpack-iframe-embed.php b/plugins/jetpack/_inc/lib/class.jetpack-iframe-embed.php
new file mode 100644
index 00000000..4445cb65
--- /dev/null
+++ b/plugins/jetpack/_inc/lib/class.jetpack-iframe-embed.php
@@ -0,0 +1,84 @@
+<?php
+/**
+ * Tweak the preview when rendered in an iframe
+ */
+
+class Jetpack_Iframe_Embed {
+	static function init() {
+		if ( ! self::is_embedding_in_iframe() ) {
+			return;
+		}
+
+		// Disable the admin bar
+		if ( ! defined( 'IFRAME_REQUEST' ) ) {
+			define( 'IFRAME_REQUEST', true );
+		}
+
+		// Prevent canonical redirects
+		remove_filter( 'template_redirect', 'redirect_canonical' );
+
+		add_action( 'wp_head', array( 'Jetpack_Iframe_Embed', 'noindex' ), 1 );
+		add_action( 'wp_head', array( 'Jetpack_Iframe_Embed', 'base_target_blank' ), 1 );
+
+		add_filter( 'shortcode_atts_video', array( 'Jetpack_Iframe_Embed', 'disable_autoplay' ) );
+		add_filter( 'shortcode_atts_audio', array( 'Jetpack_Iframe_Embed', 'disable_autoplay' ) );
+
+		if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) {
+			wp_enqueue_script( 'jetpack-iframe-embed', WPMU_PLUGIN_URL . '/jetpack-iframe-embed/jetpack-iframe-embed.js', array( 'jquery' ) );
+		} else {
+			$ver = sprintf( '%s-%s', gmdate( 'oW' ), defined( 'JETPACK__VERSION' ) ? JETPACK__VERSION : '' );
+			wp_enqueue_script( 'jetpack-iframe-embed', '//s0.wp.com/wp-content/mu-plugins/jetpack-iframe-embed/jetpack-iframe-embed.js', array( 'jquery' ), $ver );
+		}
+		wp_localize_script( 'jetpack-iframe-embed', '_previewSite', array( 'siteURL' => get_site_url() ) );
+	}
+
+	static function is_embedding_in_iframe() {
+		return (
+			self::has_iframe_get_param() && (
+				self::has_preview_get_param() ||
+				self::has_preview_theme_preview_param()
+			)
+		);
+	}
+
+	private static function has_iframe_get_param() {
+		return isset( $_GET['iframe'] ) && $_GET['iframe'] === 'true';
+	}
+
+	private static function has_preview_get_param() {
+		return isset( $_GET['preview'] ) && $_GET['preview'] === 'true';
+	}
+
+	private static function has_preview_theme_preview_param() {
+		return isset( $_GET['theme_preview'] ) && $_GET['theme_preview'] === 'true';
+	}
+
+	/**
+	 * Disable `autoplay` shortcode attribute in context of an iframe
+	 * Added via `shortcode_atts_video` & `shortcode_atts_audio` in `init`
+	 *
+	 * @param  array $atts The output array of shortcode attributes.
+	 *
+	 * @return array       The output array of shortcode attributes.
+	 */
+	static function disable_autoplay( $atts ) {
+		return array_merge( $atts, array( 'autoplay' => false ) );
+	}
+
+	/**
+	 * We don't want search engines to index iframe previews
+	 * Added via `wp_head` action in `init`
+	 */
+	static function noindex() {
+		echo '<meta name="robots" content="noindex,nofollow" />';
+	}
+
+	/**
+	 * Make sure all links and forms open in a new window by default
+	 * (unless overridden on client-side by JS)
+	 * Added via `wp_head` action in `init`
+	 */
+	static function base_target_blank() {
+		echo '<base target="_blank" />';
+	}
+}