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<?php |
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declare(strict_types=1); |
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namespace Squareetlabs\VeriFactu\Helpers; |
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class HashHelper |
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{ |
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private static array $invoiceRequiredFields = [ |
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'issuer_tax_id', |
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'invoice_number', |
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'issue_date', |
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'invoice_type', |
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'total_tax', |
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'total_amount', |
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'previous_hash', |
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'generated_at', |
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]; |
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/** |
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* Generates the hash for an invoice record according to AEAT specifications. |
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* |
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* CRITICAL: Field names MUST match the official AEAT XML field names as per |
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* "Detalle de las especificaciones técnicas para generación de la huella o hash |
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* de los registros de facturación" v0.1.2 (27/08/2024), page 6. |
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* |
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* @param array $data Invoice record data with snake_case keys (for compatibility). |
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* @return array ['hash' => string, 'inputString' => string] |
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*/ |
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public static function generateInvoiceHash(array $data): array |
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{ |
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self::validateData(self::$invoiceRequiredFields, $data); |
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$inputString = self::field('IDEmisorFactura', $data['issuer_tax_id']); |
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$inputString .= self::field('NumSerieFactura', $data['invoice_number']); |
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$inputString .= self::field('FechaExpedicionFactura', $data['issue_date']); |
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$inputString .= self::field('TipoFactura', $data['invoice_type']); |
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$inputString .= self::field('CuotaTotal', $data['total_tax']); |
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$inputString .= self::field('ImporteTotal', $data['total_amount']); |
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$inputString .= self::field('Huella', $data['previous_hash']); |
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$inputString .= self::field('FechaHoraHusoGenRegistro', $data['generated_at'], false); |
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$hash = strtoupper(hash('sha256', $inputString, false)); |
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return ['hash' => $hash, 'inputString' => $inputString]; |
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} |
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private static function validateData(array $requiredFields, array $data): void |
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{ |
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$missing = array_diff($requiredFields, array_keys($data)); |
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if (!empty($missing)) { |
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throw new \InvalidArgumentException('Missing required fields: ' . implode(', ', $missing)); |
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} |
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$extra = array_diff(array_keys($data), $requiredFields); |
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if (!empty($extra)) { |
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throw new \InvalidArgumentException('Unexpected fields: ' . implode(', ', $extra)); |
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} |
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} |
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private static function field(string $name, string $value, bool $includeSeparator = true): string |
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{ |
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$value = trim($value); |
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return "{$name}={$value}" . ($includeSeparator ? '&' : ''); |
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} |
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} |
squareetlabs /
LaravelVerifactu
