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<?php |
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namespace SilverStripe\Control\Middleware; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Control\HTTPResponse; |
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use Symfony\Component\ExpressionLanguage\ExpressionLanguage; |
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/** |
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* ExpressionBased Middleware. |
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*/ |
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class ExpressionBasedMiddleware implements HTTPMiddleware |
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{ |
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public $expressionLanguage; |
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public static $dependencies = [ |
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'expressionLanguage' => '%$'.ExpressionLanguage::class, |
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]; |
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protected $context; |
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protected $expressions; |
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public function __construct(array $context = []) |
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{ |
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$this->context = $context; |
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} |
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/** |
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* Workaround for lack of property typing in php < 7.4. |
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*/ |
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public function __set(string $name, string $value) |
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{ |
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if (0 === strpos($name, 'req') || 0 === strpos($name, 'res')) { |
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$this->expressions[substr($name, 0, 3)] = $value; |
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} |
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} |
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public function process(HTTPRequest $request, callable $delegate) |
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{ |
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$this->context['req'] = $request; |
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if (isset($this->expressions['req'])) { |
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$result = $this->expressionLanguage->evaluate($this->expressions['req'], $this->context); |
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if ($result instanceof HTTPResponse) { |
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return $result; |
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} |
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} |
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$response = $delegate($request); |
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if (isset($this->expressions['res'])) { |
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$this->expressionLanguage->evaluate($this->expressions['res'], $this->context); |
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} |
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return $response; |
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} |
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} |
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silverstripe /
silverstripe-framework
