Adding a new class for properly handling Instagram oembeds in previews

classes/class-wpcom-liveblog-entry-instagram-oembed.php

@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * Class WPCOM_Liveblog_Entry_Instagram_oEmbed
+ *
+ * This addresses the issues with Instagram oEmbeds in Liveblog
+ */
+class WPCOM_Liveblog_Entry_Instagram_oEmbed {
+
+	/**
+	 * Called by WPCOM_Liveblog::load(),
+	 * it registers the initial filter
+	 */
+	public static function load() {
+
+		add_filter( 'liveblog_entry_enable_embeds', array( __CLASS__, 'register_filters' ) );
+
+	}
+
+	/**
+	 * Register the filters just in time - when we are about to return HTML in endpoint
+	 */
+	public static function register_filters( $return ) {
+
+		add_filter( 'oembed_fetch_url', array( __CLASS__, 'add_omitscript_arg' ), 10, 3 );
+		add_filter( 'embed_oembed_html', array( __CLASS__, 'add_custom_script' ), 10, 4 );
+		add_filter( 'comment_text', array( __CLASS__, 'unregister_filters' ), 0, 1 );
+		return $return;
+	}
+
+	/** 
+	 * Deregister the filter we added
+	 */
+	public static function unregister_filters( $return ) {
+		remove_filter( 'oembed_fetch_url', array( __CLASS__, 'add_omitscript_arg' ), 10 );
+		remove_filter( 'embed_oembed_html', array( __CLASS__, 'add_custom_script' ), 10 );
+		return $return;
+	}
+
+	public static function add_omitscript_arg( $provider, $url, $args ) {
+		if ( true === self::is_instagram_provider( $url ) )  {
+			$provider = add_query_arg( 'omitscript', rawurlencode( true ), $provider );
+		}
+		return $provider;
+	}
+
+	public static function add_custom_script( $html, $url, $attr, $post_ID ) {
+		if ( true === self::is_instagram_provider( $url ) )	 {
+			$instagram_script_uri = '//platform.instagram.com/en_US/embeds.js';
+			$script = '<script type="text/javascript">';
+			$script .= '(function( $ ){ if ( undefined === window.instgrm ) { $.getScript( '.wp_json_encode( $instagram_script_uri ).' ); } $(".instagram-media a").each( function(){ if ( -1 === $(this).attr("href").indexOf("instagr") ) { $(this).replaceWith( $(this).text() ) } } ); window.instgrm.Embeds.process(); })(jQuery);';
+			$script .= '</script>';
+			$html .= $script;
+		}
+		return $html;
+	}
+
+	private static function is_instagram_provider( $url ) {
+		$wp_oembed = _wp_oembed_get_object();
+		$provider = $wp_oembed->get_provider( $url );
+		return ( 'https://api.instagram.com/oembed' === $provider );
+	}
+}

liveblog.php

@@ -82,6 +82,7 @@ public static function load() {
 		WPCOM_Liveblog_Entry_Extend::load();
 		WPCOM_Liveblog_Lazyloader::load();
 		WPCOM_Liveblog_Socketio_Loader::load();
+		WPCOM_Liveblog_Entry_Instagram_oEmbed::load();
 	}
 
 	public static function add_custom_post_type_support( $query ) {
@@ -122,6 +123,7 @@ private static function includes() {
 		require( dirname( __FILE__ ) . '/classes/class-wpcom-liveblog-entry-extend-feature-authors.php' );
 		require( dirname( __FILE__ ) . '/classes/class-wpcom-liveblog-lazyloader.php' );
 		require( dirname( __FILE__ ) . '/classes/class-wpcom-liveblog-socketio-loader.php' );
+		require( dirname( __FILE__ ) . '/classes/class-wpcom-liveblog-entry-instagram-oembed.php' );
 
 		// Manually include ms.php theme-side in multisite environments because
 		// we need its filesize and available space functions.