Bring back support for legacy shortcodes

api.php

@@ -0,0 +1,51 @@
+<?php
+/**
+ * Cognito Forms WordPress Plugin.
+ *
+ * The Cognito Forms WordPress Plugin is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * The Cognito Forms WordPress Plugin is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+// Cognito API access
+if ( !class_exists('CognitoAPI') ) {
+	class CognitoAPI {
+		public static $formsBase = 'https://www.cognitoforms.com/';
+
+		// Convert MS GUID to Short GUID
+		private static function guid_to_short_guid($guid) {
+			$guid_byte_order = [ 3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15 ];
+			$guid = preg_replace( "/[^a-zA-Z0-9]+/", "", $guid );
+			$hex = "";
+			for ( $i = 0; $i < 16; $i++ )
+				$hex .= substr( $guid, 2 * $guid_byte_order[$i], 2 );
+			$bin = hex2bin( $hex );
+			$encoded = base64_encode( $bin );
+			$encoded = str_replace( "/", "_", $encoded );
+			$encoded = str_replace( "+", "-", $encoded );
+			$encoded = substr ( $encoded, 0, 22 );
+			return $encoded;
+		}
+
+		// Builds form embed script
+		public static function get_form_embed_script( $public_key, $formId ) {
+			$base = self::$formsBase;
+			$public_short_guid = self::guid_to_short_guid( $public_key );
+
+			return <<< EOF
+				<script src="{$base}/f/seamless.js" data-key="{$public_short_guid}" data-form="{$formId}"></script>
+	EOF;
+		}
+	}
+}
+
+?>