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<?php |
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namespace Pepeverde\ECTBuilder; |
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use Exception; |
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use function header; |
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use function headers_sent; |
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use function implode; |
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use InvalidArgumentException; |
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use Psr\Http\Message\MessageInterface; |
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use RuntimeException; |
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class ECTBuilder |
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{ |
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private $policies; |
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private $needsCompile = true; |
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private $compiled = ''; |
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/** |
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* @param array $policy |
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*/ |
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public function __construct(array $policy = []) |
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{ |
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$this->policies = $policy; |
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} |
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/** |
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* Compile the current policies into an Expect-CT header |
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* |
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* @return string |
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* @throws InvalidArgumentException |
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*/ |
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public function compile() |
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{ |
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$compiled = []; |
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// Set max-age to 0 if there is no policy set in constructor |
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if (empty($this->policies)) { |
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$this->policies['maxAge'] = 0; |
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} |
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// max-age is mandatory |
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if (!isset($this->policies['maxAge'])) { |
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throw new InvalidArgumentException('maxAge is mandatory. Set a positive integer as maxAge value.'); |
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} |
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if (isset($this->policies['enforce']) && (bool)$this->policies['enforce']) { |
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$compiled[] = 'enforce'; |
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} |
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$compiled[] = 'max-age=' . $this->parseMaxAge($this->policies['maxAge']); |
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if (isset($this->policies['reportUri']) && !empty($this->policies['reportUri'])) { |
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$compiled[] = 'report-uri="' . $this->policies['reportUri'] . '"'; |
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} |
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$this->compiled = implode(', ', $compiled); |
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$this->needsCompile = false; |
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return $this->compiled; |
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} |
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/** |
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* @param int $maxAge |
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* @return int |
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* @throws InvalidArgumentException |
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*/ |
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private function parseMaxAge($maxAge) |
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{ |
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if (is_array($maxAge)) { |
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throw new InvalidArgumentException('maxAge is an array so it is not a valid value for maxAge. Use a positive integer'); |
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} |
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if (!is_int($maxAge) || $maxAge < 0) { |
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throw new InvalidArgumentException($maxAge . ' is not a valid value for maxAge. Use a positive integer'); |
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} |
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return $maxAge; |
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} |
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/** |
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* Get the formatted Expect-CT header |
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* |
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* @return string |
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* @throws InvalidArgumentException::class |
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*/ |
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public function getCompiledHeader() |
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{ |
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if ($this->needsCompile) { |
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$this->compile(); |
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} |
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return $this->compiled; |
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} |
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/** |
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* PSR-7 header injection |
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* |
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* @param MessageInterface $message |
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* @return MessageInterface |
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* @throws InvalidArgumentException |
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*/ |
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public function injectECTHeader(MessageInterface $message) |
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{ |
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if ($this->needsCompile) { |
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$this->compile(); |
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} |
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return $message->withAddedHeader('Expect-CT', $this->compiled); |
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} |
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/** |
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* Send the compiled Expect-CT as a header() |
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* |
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* @return boolean |
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* @throws Exception |
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*/ |
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public function sendECTHeader() |
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{ |
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if (headers_sent()) { |
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throw new RuntimeException('Headers already sent!'); |
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} |
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if ($this->needsCompile) { |
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$this->compile(); |
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} |
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header('Expect-CT: ' . $this->compiled); |
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return true; |
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} |
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} |
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pepeverde /
Expect-CT-Builder
