CacheHashConfiguration.php

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<?php
 
declare(strict_types=1);
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Frontend\Page;
 
class ‪CacheHashConfiguration
{
    public const ‪ASPECT_CACHED_PARAMETERS_WHITELIST = 'cachedParametersWhiteList';
    public const ‪ASPECT_EXCLUDED_PARAMETERS = 'excludedParameters';
    public const ‪ASPECT_EXCLUDED_PARAMETERS_IF_EMPTY = 'excludedParametersIfEmpty';
    public const ‪ASPECT_REQUIRED_CACHE_HASH_PRESENCE_PARAMETERS = 'requireCacheHashPresenceParameters';
 
    protected const ‪PROPERTY_EXCLUDE_ALL_EMPTY_PARAMETERS = 'excludeAllEmptyParameters';
    protected const ‪INDICATOR_STARTS_WITH = '^';
    protected const ‪INDICATOR_CONTAINS = '~';
    protected const ‪INDICATOR_EQUALS = '=';
 
    protected const ‪ALLOWED_INDICATORS = [
        ‪self::INDICATOR_STARTS_WITH,
        ‪self::INDICATOR_CONTAINS,
        ‪self::INDICATOR_EQUALS,
    ];
 
    protected const ‪ALLOWED_PROPERTY_NAMES = [
        ‪self::PROPERTY_EXCLUDE_ALL_EMPTY_PARAMETERS,
        ‪self::ASPECT_CACHED_PARAMETERS_WHITELIST,
        ‪self::ASPECT_EXCLUDED_PARAMETERS,
        ‪self::ASPECT_EXCLUDED_PARAMETERS_IF_EMPTY,
        ‪self::ASPECT_REQUIRED_CACHE_HASH_PRESENCE_PARAMETERS,
    ];
 
    protected ‪$configuration;
 
    protected ‪$data = [];
 
    public function ‪__construct(array ‪$configuration = null)
    {
        ‪$configuration = ‪$configuration ?? ‪$GLOBALS['TYPO3_CONF_VARS']['FE']['cacheHash'] ?? [];
        $this->configuration = array_filter(‪$configuration, [$this, 'isAllowedProperty'], ARRAY_FILTER_USE_KEY);
        $this->‪processConfiguration();
    }
 
    public function ‪with(‪CacheHashConfiguration $other): self
    {
        $target = clone $this;
        $target->configuration = array_merge($this->configuration, $other->configuration);
        $target->processConfiguration();
        return $target;
    }
 
    public function ‪shallExcludeAllEmptyParameters(): bool
    {
        return !empty($this->configuration[self::PROPERTY_EXCLUDE_ALL_EMPTY_PARAMETERS]);
    }
 
    public function ‪applies(string $aspect, string $value): bool
    {
        return $this->‪equals($aspect, $value)
            || $this->‪contains($aspect, $value)
            || $this->‪startsWith($aspect, $value);
    }
 
    public function ‪equals(string $aspect, string $value): bool
    {
        ‪$data = $this->‪getData($aspect, self::INDICATOR_EQUALS);
        return !empty(‪$data) && in_array($value, ‪$data, true);
    }
 
    public function ‪startsWith(string $aspect, string $value): bool
    {
        ‪$data = $this->‪getData($aspect, self::INDICATOR_STARTS_WITH);
        if (empty(‪$data)) {
            return false;
        }
        foreach (‪$data as $item) {
            if (strpos($value, $item) === 0) {
                return true;
            }
        }
        return false;
    }
 
    public function ‪contains(string $aspect, string $value): bool
    {
        ‪$data = $this->‪getData($aspect, self::INDICATOR_CONTAINS);
        if (empty(‪$data)) {
            return false;
        }
        foreach (‪$data as $item) {
            if (strpos($value, $item) !== false) {
                return true;
            }
        }
        return false;
    }
 
    public function ‪hasData(string $aspect): bool
    {
        return !empty($this->data[$aspect]);
    }
 
    protected function ‪getData(string $aspect, string $indicator): ?array
    {
        return $this->data[$aspect][$indicator] ?? null;
    }
 
    protected function ‪defineData(string $aspect): void
    {
        if (empty($this->configuration[$aspect])) {
            return;
        }
        if (!is_array($this->configuration[$aspect])) {
            throw new \LogicException(
                sprintf('Expected array value, got %s', gettype($this->configuration[$aspect])),
                1580225311
            );
        }
        ‪$data = [];
        foreach ($this->configuration[$aspect] as $value) {
            if (!is_scalar($value)) {
                throw new \LogicException(
                    sprintf('Expected scalar value, got %s', gettype($value)),
                    1580225312
                );
            }
            if ($value === '') {
                continue;
            }
            $indicator = $value[0] ?? null;
            // normalize value to be indicated
            if (!in_array($indicator, self::ALLOWED_INDICATORS, true)) {
                $indicator = ‪self::INDICATOR_EQUALS;
                $value = self::INDICATOR_EQUALS . $value;
            }
            if (strlen((string)$value) === 1) {
                throw new \LogicException(
                    sprintf('Empty value after %s indicator', $indicator),
                    1580225313
                );
            }
            ‪$data[$indicator][] = substr((string)$value, 1);
        }
        if (!empty(‪$data)) {
            $this->data[$aspect] = ‪$data;
        }
    }
 
    protected function ‪processConfiguration(): void
    {
        $this->data = [];
        $this->‪defineData(self::ASPECT_CACHED_PARAMETERS_WHITELIST);
        $this->‪defineData(self::ASPECT_EXCLUDED_PARAMETERS);
        $this->‪defineData(self::ASPECT_EXCLUDED_PARAMETERS_IF_EMPTY);
        $this->‪defineData(self::ASPECT_REQUIRED_CACHE_HASH_PRESENCE_PARAMETERS);
    }
 
    protected function ‪isAllowedProperty(string $propertyName): bool
    {
        return in_array($propertyName, self::ALLOWED_PROPERTY_NAMES, true);
    }
}