Password.php

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<?php
abstract class Password {
    protected $factory;

    protected $hash;

    protected $config;

    final public function __construct( PasswordFactory $factory, array $config, $hash = null ) {
        if ( !isset( $config['type'] ) ) {
            throw new MWException( 'Password configuration must contain a type name.' );
        }
        $this->config = $config;
        $this->factory = $factory;

        if ( $hash !== null && strlen( $hash ) >= 3 ) {
            // Strip the type from the hash for parsing
            $hash = substr( $hash, strpos( $hash, ':', 1 ) + 1 );
        }

        $this->hash = $hash;
        $this->parseHash( $hash );
    }

    final public function getType() {
        return $this->config['type'];
    }

    protected function parseHash( $hash ) {
    }

    public function needsUpdate() {
    }

    public function equals( $other ) {
        if ( !$other instanceof self ) {
            // No need to use the factory because we're definitely making
            // an object of the same type.
            $obj = clone $this;
            $obj->crypt( $other );
            $other = $obj;
        }

        return hash_equals( $this->toString(), $other->toString() );
    }

    public function toString() {
        return ':' . $this->config['type'] . ':' . $this->hash;
    }

    abstract public function crypt( $password );
}