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| 1 | <?php |
| 2 | /** |
| 3 | * Jingga |
| 4 | * |
| 5 | * PHP Version 8.1 |
| 6 | * |
| 7 | * @package phpOMS\Utils\Parser\Pdf |
| 8 | * @copyright Dennis Eichhorn |
| 9 | * @license OMS License 2.0 |
| 10 | * @version 1.0.0 |
| 11 | * @link https://jingga.app |
| 12 | */ |
| 13 | declare(strict_types=1); |
| 14 | |
| 15 | namespace phpOMS\Utils\Parser\Pdf; |
| 16 | |
| 17 | use phpOMS\Ai\Ocr\Tesseract\TesseractOcr; |
| 18 | use phpOMS\System\SystemUtils; |
| 19 | use phpOMS\Utils\StringUtils; |
| 20 | |
| 21 | /** |
| 22 | * Pdf parser class. |
| 23 | * |
| 24 | * @package phpOMS\Utils\Parser\Pdf |
| 25 | * @license OMS License 2.0 |
| 26 | * @link https://jingga.app |
| 27 | * @since 1.0.0 |
| 28 | */ |
| 29 | class PdfParser |
| 30 | { |
| 31 | /** |
| 32 | * PDFToText path. |
| 33 | * |
| 34 | * @var string |
| 35 | * @var 1.0.0 |
| 36 | */ |
| 37 | public static string $pdftotext = '/usr/bin/pdftotext'; |
| 38 | |
| 39 | /** |
| 40 | * PDFToPPM path. |
| 41 | * |
| 42 | * @var string |
| 43 | * @var 1.0.0 |
| 44 | */ |
| 45 | public static string $pdftoppm = '/usr/bin/pdftoppm'; |
| 46 | |
| 47 | /** |
| 48 | * Pdf to text |
| 49 | * |
| 50 | * @param string $path Pdf path |
| 51 | * |
| 52 | * @return string |
| 53 | * |
| 54 | * @since 1.0.0 |
| 55 | */ |
| 56 | public static function pdf2text(string $path, string $optimizer = '') : string |
| 57 | { |
| 58 | $text = ''; |
| 59 | $tmpDir = \sys_get_temp_dir(); |
| 60 | |
| 61 | $out = \tempnam($tmpDir, 'oms_pdf_'); |
| 62 | if ($out === false) { |
| 63 | return ''; |
| 64 | } |
| 65 | |
| 66 | if (\is_file(self::$pdftotext)) { |
| 67 | try { |
| 68 | SystemUtils::runProc( |
| 69 | self::$pdftotext, '-layout ' |
| 70 | . \escapeshellarg($path) . ' ' |
| 71 | . \escapeshellarg($out) |
| 72 | ); |
| 73 | } catch (\Throwable $_) { |
| 74 | \unlink($out); |
| 75 | |
| 76 | return ''; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | $text = \file_get_contents($out); |
| 81 | \unlink($out); |
| 82 | |
| 83 | if ($text === false) { |
| 84 | $text = ''; |
| 85 | } |
| 86 | |
| 87 | if (\strlen($text) > 255) { |
| 88 | return $text; |
| 89 | } |
| 90 | |
| 91 | $out = \tempnam($tmpDir, 'oms_pdf_'); |
| 92 | if ($out === false) { |
| 93 | return ''; |
| 94 | } |
| 95 | |
| 96 | if (\is_file(self::$pdftoppm)) { |
| 97 | try { |
| 98 | SystemUtils::runProc( |
| 99 | self::$pdftoppm, |
| 100 | '-jpeg -r 300 ' |
| 101 | . \escapeshellarg($path) . ' ' |
| 102 | . \escapeshellarg($out) |
| 103 | ); |
| 104 | } catch (\Throwable $_) { |
| 105 | \unlink($out); |
| 106 | |
| 107 | return ''; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | $files = \glob($out . '*'); |
| 112 | if ($files === false) { |
| 113 | \unlink($out); |
| 114 | |
| 115 | return $text === false ? '' : $text; |
| 116 | } |
| 117 | |
| 118 | foreach ($files as $file) { |
| 119 | if (!StringUtils::endsWith($file, '.jpg') |
| 120 | && !StringUtils::endsWith($file, '.png') |
| 121 | && !StringUtils::endsWith($file, '.gif') |
| 122 | ) { |
| 123 | continue; |
| 124 | } |
| 125 | |
| 126 | /* Too slow |
| 127 | Thresholding::integralThresholding($file, $file); |
| 128 | Skew::autoRotate($file, $file, 10); |
| 129 | */ |
| 130 | |
| 131 | if (!empty($optimizer) && \is_file($optimizer)) { |
| 132 | try { |
| 133 | SystemUtils::runProc( |
| 134 | $optimizer, |
| 135 | \escapeshellarg($file) . ' ' |
| 136 | . \escapeshellarg($file) |
| 137 | ); |
| 138 | } catch (\Throwable $_) { |
| 139 | \unlink($file); |
| 140 | |
| 141 | continue; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | $ocr = new TesseractOcr(); |
| 146 | $text = $ocr->parseImage($file); |
| 147 | |
| 148 | \unlink($file); |
| 149 | } |
| 150 | |
| 151 | \unlink($out); |
| 152 | |
| 153 | return $text; |
| 154 | } |
| 155 | } |