feat: voucher purchase flow
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<?php
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declare(strict_types=1);
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namespace App\BusProNet\XmlParser;
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use App\BusProNet\Model\VoucherPreview;
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use Symfony\Component\DomCrawler\Crawler;
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/**
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* Parses GUTSCHEINVORSCHAU responses.
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*
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* Expected XML structure (test system, 2026-10-01):
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* <ergebnis>
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* <satz typ="GUTSCHEINVORSCHAU"/>
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* <gutscheinpdf>data:application/pdf;base64,JVBERi0xLjQ…</gutscheinpdf>
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* </ergebnis>
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*/
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final class VoucherPreviewParser extends AbstractParser
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{
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private const string DATA_URI_PREFIX = 'data:application/pdf;base64,';
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public function parse(Crawler $node): VoucherPreview
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{
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$dataUri = trim($this->getStringOrNullValue($node->filterXPath('//gutscheinpdf')) ?? '');
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if (!str_starts_with($dataUri, self::DATA_URI_PREFIX)) {
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throw new \InvalidArgumentException('Missing or malformed PDF data URI in voucher preview response.');
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}
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$pdf = base64_decode(substr($dataUri, \strlen(self::DATA_URI_PREFIX)), true);
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if (false === $pdf || '' === $pdf) {
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throw new \InvalidArgumentException('Undecodable PDF in voucher preview response.');
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}
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return new VoucherPreview($pdf);
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}
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}
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