rugk/threema-msgapi-sdk-php

<?php
/**
 * @author Threema GmbH
 * @copyright Copyright (c) 2015-2016 Threema GmbH
 */


namespace Threema\MsgApi;

/**
 * Interface PublicKeyStore
 * Store the fetched Public Keys
 *
 * @package Threema\MsgApi
 */
abstract class PublicKeyStore {

    /**
     * threemaId => publicKey cache
     * @var array
     */
    private $cache = array();

    /**
     * return null if the public key not found in the store
     * @param string $threemaId
     * @return string|null
     */
    public final function getPublicKey($threemaId) {
        if(array_key_exists($threemaId, $this->cache)) {
            return $this->cache[$threemaId];
        }

        $publicKey = $this->findPublicKey($threemaId);
        if(null !== $publicKey) {
            $this->cache[$threemaId] = $publicKey;
        }
        return $publicKey;
    }

    /**
     * return null if the public key not found in the store
     * @param string $threemaId
     * @return string|null
     */
    abstract protected function findPublicKey($threemaId);

    /**
     * set and save a public key
     * @param string $threemaId
     * @param string $publicKey
     * @return bool
     */
    final public function setPublicKey($threemaId, $publicKey) {
        $this->cache[$threemaId] = $publicKey;
        return $this->savePublicKey($threemaId, $publicKey);
    }

    /**
     * save a public key
     * @param string $threemaId
     * @param string $publicKey
     * @return bool
     */
    abstract protected function savePublicKey($threemaId, $publicKey);
}