Inventory_Presser_Addon_License_Validator

	class Inventory_Presser_Addon_License_Validator
	{		
		/**
		 * is_active
		 *
		 * @param  string $product_id 
		 * @param  string $license_key
		 * @return bool
		 */
		public static function is_active( $product_id, $license_key )
		{
			$response = self::api_response( 'check_license', $product_id, $license_key );
			return isset( $response->license ) && 'valid' == $response->license;
		}
		
		/**
		 * activate
		 * 
		 * Activates the license with the plugin store
		 *
		 * @param  string $product_id 
		 * @param  string $license_key
		 * @return bool
		 */
		public static function activate( $product_id, $license_key )
		{
			$response = self::api_response( 'activate_license', $product_id, $license_key );
			return isset( $response->license ) && 'valid' == $response->license;
		}

		/**
		 * api_response
		 * 
		 * Retrieves the license activation response from the plugin store.
		 *
		 * @param  string $action
		 * @param  string $product_id 
		 * @param  string $license_key
		 * @return void
		 */
		private static function api_response( $action, $product_id, $license_key )
		{
			$response = wp_remote_get( esc_url_raw( self::api_url( $action, $license_key, $product_id ) ) );
			return json_decode( wp_remote_retrieve_body( $response ), true );
		}
		
		/**
		 * api_url
		 * 
		 * Creates a URL to the plugin store where this license can be renewed.
		 *
		 * @param  string $action
		 * @param  string $product_id 
		 * @param  string $license_key
		 * @return string A URL
		 */
		private static function api_url( $action, $product_id, $license_key )
		{
			return sprintf(
				'https://inventorypresser.com/?edd_action=%s&item_id=%s&license=%s&url=%s',
				$action,
				$product_id,
				$license_key,
				urlencode( home_url() )
			);
		}
	}