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CONV-142: Implement PNG to PDF driver #136

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Merged
menvil merged 1 commit into from
Jun 1, 2026
Merged

CONV-142: Implement PNG to PDF driver #136

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74 changes: 74 additions & 0 deletions app/Conversion/Drivers/Image/PngToPdfDriver.php
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<?php

declare(strict_types=1);

namespace App\Conversion\Drivers\Image;

use App\Support\Conversions\Contracts\ConverterDriver;
use App\Support\Conversions\DTO\ConversionContext;
use App\Support\Conversions\DTO\ConversionResult;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Support\Facades\Storage;

final class PngToPdfDriver implements ConverterDriver
{
public function key(): string
{
return 'png_to_pdf';
}

public function convert(ConversionContext $context): ConversionResult
{
$sourceContent = Storage::disk('local')->get($context->sourceFile->stored_path);
$imageDataUri = 'data:image/png;base64,'.base64_encode($sourceContent);

$pageSize = $context->options['page_size'] ?? 'a4';
$orientation = $this->resolveOrientation($context->options['orientation'] ?? 'auto', $sourceContent);
$margin = $this->resolveMargin($context->options['margin'] ?? 'small');
$fitMode = $context->options['fit_mode'] ?? 'contain';

$html = view('pdf.single-image', compact('imageDataUri', 'margin', 'fitMode'))->render();

$pdf = Pdf::loadHTML($html)->setPaper($pageSize, $orientation);

$outputPath = $context->outputDirectory.'/result.pdf';
Storage::disk('local')->put($outputPath, $pdf->output());

return new ConversionResult(
path: $outputPath,
originalName: 'result.pdf',
mimeType: 'application/pdf',
extension: 'pdf',
sizeBytes: Storage::disk('local')->size($outputPath),
);
}

private function resolveOrientation(string $orientation, string $imageContent): string
{
if ($orientation !== 'auto') {
return $orientation;
}

$image = imagecreatefromstring($imageContent);
if ($image === false) {
return 'portrait';
}

$width = imagesx($image);
$height = imagesy($image);
imagedestroy($image);

return $width > $height ? 'landscape' : 'portrait';
}

private function resolveMargin(string $margin): string
{
return match ($margin) {
'none' => '0mm',
'small' => '10mm',
'medium' => '20mm',
'large' => '30mm',
default => '10mm',
};
}
}
37 changes: 37 additions & 0 deletions resources/views/pdf/single-image.blade.php
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { margin: {{ $margin }}; }
.image-container {
width: 100%;
height: 100%;
@if ($fitMode === 'contain')
display: flex;
align-items: center;
justify-content: center;
@endif
}
img {
@if ($fitMode === 'contain')
max-width: 100%;
max-height: 100%;
object-fit: contain;
@elseif ($fitMode === 'fill')
width: 100%;
height: 100%;
object-fit: fill;
@else
display: block;
@endif
}
</style>
</head>
<body>
<div class="image-container">
<img src="{{ $imageDataUri }}" alt="">
</div>
</body>
</html>