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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XML; |
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use DOMDocument; |
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use InvalidArgumentException; |
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use RuntimeException; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XML\Exception\IOException; |
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use SimpleSAML\XML\Exception\UnparseableXMLException; |
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use function defined; |
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use function file_get_contents; |
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use function is_file; |
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use function is_readable; |
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use function libxml_clear_errors; |
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use function libxml_disable_entity_loader; |
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use function libxml_get_last_error; |
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use function libxml_use_internal_errors; |
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use function sprintf; |
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use function trim; |
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/** |
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* @package simplesamlphp/xml-common |
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*/ |
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final class DOMDocumentFactory |
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{ |
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/** |
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* Constructor for DOMDocumentFactory. |
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* This class should never be instantiated |
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*/ |
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private function __construct() |
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{ |
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} |
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/** |
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* @param string $xml |
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* |
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* @return \DOMDocument |
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*/ |
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public static function fromString(string $xml): DOMDocument |
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{ |
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Assert::stringNotEmpty(trim($xml)); |
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$internalErrors = libxml_use_internal_errors(true); |
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libxml_clear_errors(); |
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$domDocument = self::create(); |
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$options = LIBXML_DTDLOAD | LIBXML_DTDATTR | LIBXML_NONET | LIBXML_PARSEHUGE; |
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if (defined('LIBXML_COMPACT')) { |
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$options |= LIBXML_COMPACT; |
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} |
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$loaded = $domDocument->loadXML($xml, $options); |
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libxml_use_internal_errors($internalErrors); |
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if (!$loaded) { |
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$error = libxml_get_last_error(); |
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libxml_clear_errors(); |
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throw new UnparseableXMLException($error); |
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} |
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libxml_clear_errors(); |
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foreach ($domDocument->childNodes as $child) { |
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if ($child->nodeType === XML_DOCUMENT_TYPE_NODE) { |
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throw new RuntimeException( |
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'Dangerous XML detected, DOCTYPE nodes are not allowed in the XML body', |
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); |
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} |
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} |
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return $domDocument; |
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} |
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/** |
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* @param string $file |
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* |
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* @return \DOMDocument |
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*/ |
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public static function fromFile(string $file): DOMDocument |
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{ |
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// libxml_disable_entity_loader(true) disables \DOMDocument::load() method |
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// so we need to read the content and use \DOMDocument::loadXML() |
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error_clear_last(); |
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$xml = @file_get_contents($file); |
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if ($xml === false) { |
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/** @psalm-var array $e */ |
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$e = error_get_last(); |
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$error = $e['message'] ?: "Check that the file exists and can be read."; |
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throw new IOException("File '$file' was not loaded; $error"); |
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} |
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if (trim($xml) === '') { |
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throw new RuntimeException(sprintf('File "%s" does not have content', $file)); |
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} |
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return static::fromString($xml); |
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} |
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/** |
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* @param ?string $version |
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* @param ?string $encoding |
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* @return \DOMDocument |
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*/ |
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public static function create(?string $version = null, ?string $encoding = null): DOMDocument |
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{ |
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return new DOMDocument($version ?? '1.0', $encoding ?? ''); |
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} |
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} |
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simplesamlphp /
xml-common
