Introduce XML-RPC extensions

Custom XML-RPC endpoints to handle thumbnail upload and management so we can start syndicating thumbnails alongside posts.

see #33

includes/class-syndication-wp-xmlrpc-client.php

@@ -403,3 +403,90 @@ class Syndication_WP_XMLRPC_Client extends WP_HTTP_IXR_Client implements Syndica
 	}
 
 }
+
+class Syndication_WP_XMLRPC_Client_Extensions {
+
+	public static function init() {
+		add_filter( 'xmlrpc_methods' , array( __CLASS__, 'push_syndicate_methods' ) );
+		add_filter( 'wp_get_attachment_url' , array( __CLASS__, 'push_syndicate_attachment_url' ), 10, 2 );
+	}
+
+	public static function push_syndicate_methods( $methods ) {
+        $methods['syndication.AddThumbnail']    = array( __CLASS__, 'xmlrpc_add_thumbnail' );
+        $methods['syndication.DeleteThumbnail']    = array( __CLASS__, 'xmlrpc_delete_thumbnail' );
+		return $methods;
+	}
+
+	public static function xmlrpc_add_thumbnail( $args ) {
+	        global $wp_xmlrpc_server;
+	        $wp_xmlrpc_server->escape( $args );
+
+	        $blog_id	    = (int) $args[0];
+	        $username	    = $args[1];
+	        $password	    = $args[2];
+	        $post_ID            = (int)$args[3];
+	        $content_struct     = $args[4];
+
+	        if ( !$user = $wp_xmlrpc_server->login( $username, $password ) )
+	            return $wp_xmlrpc_server->error;
+
+	        if ( ! current_user_can( 'edit_posts' ) )
+	            return new IXR_Error( 401, __( 'Sorry, you are not allowed to post on this site.' ) );
+
+	        if ( isset( $content_struct['post_title'] ) )
+	            $data['post_title'] = $content_struct['post_title'];
+
+	        if ( isset( $content_struct['post_content'] ) )
+	            $data['post_content'] = $content_struct['post_content'];
+
+	        $data['post_type'] = 'attachment';
+
+	        if ( empty( $content_struct['guid'] ) )
+			return new IXR_Error( 403, __( 'Please provide a thumbnail URL.' ) );
+
+		$data['guid'] = $content_struct['guid'];
+
+		$wp_filetype = wp_check_filetype( $content_struct['guid'], null );
+	        if ( empty( $wp_filetype['type'] ) )
+			return new IXR_Error( 403, __( 'Invalid thumbnail URL.' ) );
+
+		$data['post_mime_type'] = $wp_filetype['type'];
+
+	        $thumbnail_id = wp_insert_attachment( $data, $content_struct['guid'], $post_ID );
+	        $attachment_meta_data = wp_generate_attachment_metadata( $thumbnail_id, $content_struct['guid'] );
+	        $attachment_meta_data['push_syndicate_featured_image'] = 'yes';
+	        wp_update_attachment_metadata( $thumbnail_id, $attachment_meta_data );
+
+	        if ( set_post_thumbnail( $post_ID, $thumbnail_id ) )
+			return new IXR_Error( 403, __( 'Could not attach post thumbnail.' ) );
+
+		return $thumbnail_id;
+
+	}
+
+	public static function xmlrpc_delete_thumbnail( $args ) {
+
+		global $wp_xmlrpc_server;
+		$wp_xmlrpc_server->escape( $args );
+
+		$blog_id	    = (int) $args[0];
+		$username	    = $args[1];
+		$password	    = $args[2];
+		$post_ID            = (int)$args[3];
+
+		if ( !$user = $wp_xmlrpc_server->login( $username, $password ) )
+			return $wp_xmlrpc_server->error;
+
+		if ( ! current_user_can( 'edit_post', $post_ID ) )
+			return new IXR_Error( 401, __( 'Sorry, you are not allowed to post on this site.' ) );
+
+		if ( ! delete_post_thumbnail( $post_ID ) )
+			return new IXR_Error( 403, __( 'Could not remove post thumbnail.' ) );
+
+		return true;
+
+	}
+
+}
+
+Syndication_WP_XMLRPC_Client_Extensions::init();