add pdf parser wrapper

Utils/Parser/Pdf/PdfParser.php

@@ -0,0 +1,96 @@
+<?php
+/**
+ * Karaka
+ *
+ * PHP Version 8.0
+ *
+ * @package   phpOMS\Utils\Parser\Pdf
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://karaka.app
+ */
+declare(strict_types=1);
+
+namespace phpOMS\Utils\Parser\Pdf;
+
+use phpOMS\Ai\Ocr\Tesseract\TesseractOcr;
+use phpOMS\System\SystemUtils;
+use phpOMS\Utils\StringUtils;
+
+/**
+ * Pdf parser class.
+ *
+ * @package phpOMS\Utils\Parser\Pdf
+ * @license OMS License 1.0
+ * @link    https://karaka.app
+ * @since   1.0.0
+ */
+class PdfParser
+{
+    /**
+     * Pdf to text
+     *
+     * @param string $path Pdf path
+     *
+     * @return string
+     *
+     * @since 1.0.0
+     */
+    public static function pdf2text(string $path) : string
+    {
+        $text = '';
+        $tmpDir = \sys_get_temp_dir();
+
+        SystemUtils::runProc(
+            '/usr/bin/pdftotext', '-layout '
+                . \escapeshellarg($path) . ' '
+                .  \escapeshellarg($out = \tempnam($tmpDir, 'pdf_'))
+        );
+
+        $text = \file_get_contents($out);
+        \unlink($out);
+
+        if (\strlen($text) < 256) {
+            SystemUtils::runProc(
+                '/usr/bin/pdftoppm',
+                '-jpeg -r 300 '
+                    . \escapeshellarg($path) . ' '
+                    .  \escapeshellarg($out = \tempnam($tmpDir, 'pdf_'))
+            );
+
+            $files = \glob($out . '*');
+            if ($files === false) {
+                return $text;
+            }
+
+            foreach ($files as $file) {
+                if (
+                    !StringUtils::endsWith($file, '.jpg')
+                    && !StringUtils::endsWith($file, '.png')
+                    && !StringUtils::endsWith($file, '.gif')
+                ) {
+                    continue;
+                }
+
+                /* Too slow
+                Thresholding::integralThresholding($file, $file);
+                Skew::autoRotate($file, $file, 10);
+                */
+
+                SystemUtils::runProc(
+                    __DIR__ . '/../../../cOMS/Tools/InvoicePreprocessing/App',
+                    \escapeshellarg($file) . ' '
+                        .  \escapeshellarg($file)
+                );
+
+                $ocr = new TesseractOcr();
+                $text = $ocr->parseImage($file);
+
+                \unlink($file);
+            }
+        }
+
+        return $text;
+    }
+}