polyfony-inc/polyfony

<?php

namespace Polyfony\Store;

class Filesystem implements StoreInterface {

    private static function path(string $variable) :array {

        // compute a hash for that file
        $hash = md5($variable);
        // get the two first chars of the checksum
        list(
            $first_folder, 
            $second_folder
        ) = str_split(substr($hash, 0, 2));
        // assemble the full path with two subfolders
        return array(
            \Polyfony\Config::get('store', 'path') . 
            $first_folder .'/'. 
            $second_folder .'/',
            $hash
        );

    }

    public static function has(string $variable) :bool {
        
        // get the path for that variable
        list($path, $file) = self::path($variable);

        // if it exists
        return file_exists($path . $file);
        
    }
    

    public static function put(
        string $variable, 
        $value, 
        bool $overwrite = false,
        ?int $lifetime = null
    ) :bool {
    
        // already exists and no overwrite
        if(
            self::has($variable) && 
            !$overwrite
        ) {
            // throw an exception
            \Polyfony\Exception("{$variable} already exists in the store.");
        }
        
        // get the path for that variable
        list($path, $file) = self::path($variable);

        // if the path doesn't exist yet
        if(!is_dir($path)) {

            // create the directories
            mkdir($path, 0777, true);

        }

        // store the variable or document
        \Polyfony\Config::get('store', 'compress') ? 
            file_put_contents($path . $file, gzdeflate(msgpack_pack($value))) :
            file_put_contents($path . $file, msgpack_pack($value));

        // return status
        return self::has($variable);
        
    }
    

    public static function get(string $variable) {
        
        // doesn't exist in the store
        if(!self::has($variable)) {
            // throw an exception
            \Polyfony\Exception("{$variable} does not exist in the store.");
        }

        // get the path for that variable
        list($path, $file) = self::path($variable);

        // return it
        return \Polyfony\Config::get('store', 'compress') ? 
            msgpack_unpack(gzinflate(file_get_contents($path . $file))) :
            msgpack_unpack(file_get_contents($path . $file));

    }
    
    
    public static function remove(string $variable) :bool {
        
        // doesn't exist in the store
        if(!self::has($variable)) {
            // return false
            return false;    
        }

        // get the path for that variable
        list($path, $file) = self::path($variable);

        // return it
        unlink($path . $file);
        // return opposite of presence of the object
        return(!self::has($variable));
        
    }


}

?>