sam-api/app/Services/ESign/EsignPdfService.php

<?php

namespace App\Services\ESign;

use App\Services\Service;
use Illuminate\Support\Facades\Storage;

class EsignPdfService extends Service
{
    public function generateHash(string $filePath): string
    {
        $fullPath = Storage::disk('local')->path($filePath);

        return hash_file('sha256', $fullPath);
    }

    public function verifyIntegrity(string $filePath, string $expectedHash): bool
    {
        $actualHash = $this->generateHash($filePath);

        return hash_equals($expectedHash, $actualHash);
    }

    public function composeSigned(
        string $originalPath,
        array $signerImages,
        array $signFields
    ): string {
        // FPDI/FPDF 기반 PDF 합성 - 추후 구현
        // 현재는 원본 파일을 signed 경로로 복사
        $signedPath = str_replace('originals/', 'signed/', $originalPath);
        $signedDir = dirname(Storage::disk('local')->path($signedPath));

        if (! is_dir($signedDir)) {
            mkdir($signedDir, 0755, true);
        }

        Storage::disk('local')->copy($originalPath, $signedPath);

        return $signedPath;
    }

    public function addAuditPage(string $pdfPath, array $auditData): string
    {
        // 감사 증적 페이지 추가 - 추후 FPDI/FPDF로 구현
        return $pdfPath;
    }
}