Initial commit with Email Import Wizard and Task Processor updates

2026-05-04 08:02:11 +02:00
commit effdc5d59f
170 changed files with 67739 additions and 0 deletions
@@ -0,0 +1,98 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { execFile } from 'child_process';
+import { promisify } from 'util';
+import * as path from 'path';
+import * as fs from 'fs/promises';
+import * as os from 'os';
+
+const execFileAsync = promisify(execFile);
+
+@Injectable()
+export class PdfService {
+  private readonly logger = new Logger(PdfService.name);
+
+  /**
+   * Konvertiert eine PDF-Seite in ein PNG-Bild via Ghostscript.
+   * Gibt den Pfad zum temporären Bild zurück.
+   */
+  async pdfPageToImage(pdfPath: string, page = 1, dpi = 300): Promise<string> {
+    const tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'pdf-'));
+    const outputPath = path.join(tmpDir, `page-${page}.png`);
+
+    await execFileAsync('gs', [
+      '-dNOPAUSE',
+      '-dBATCH',
+      '-dSAFER',
+      '-sDEVICE=png16m',
+      `-dFirstPage=${page}`,
+      `-dLastPage=${page}`,
+      `-r${dpi}`,
+      `-sOutputFile=${outputPath}`,
+      pdfPath,
+    ]);
+
+    this.logger.debug(`PDF Seite ${page} konvertiert: ${outputPath}`);
+    return outputPath;
+  }
+
+  /**
+   * Konvertiert alle Seiten einer PDF in Bilder.
+   */
+  async pdfToImages(pdfPath: string, dpi = 200): Promise<string[]> {
+    const pageCount = await this.getPageCount(pdfPath);
+    const images: string[] = [];
+
+    for (let i = 1; i <= pageCount; i++) {
+      const imgPath = await this.pdfPageToImage(pdfPath, i, dpi);
+      images.push(imgPath);
+    }
+
+    return images;
+  }
+
+  /**
+   * Ermittelt die Seitenanzahl einer PDF via Ghostscript.
+   */
+  async getPageCount(pdfPath: string): Promise<number> {
+    const { stdout } = await execFileAsync('gs', [
+      '-q',
+      '-dNODISPLAY',
+      '-dNOSAFER',
+      `-c`,
+      `(${pdfPath.replace(/\\/g, '/')}) (r) file runpdfbegin pdfpagecount = quit`,
+    ]);
+    return parseInt(stdout.trim(), 10) || 1;
+  }
+
+  /**
+   * Bereinigt eine PDF (entschlüsselt sie ggf. wenn nur Owner-Passwort gesetzt ist)
+   * via Ghostscript pdfwrite.
+   */
+  async sanitizePdf(inputPath: string): Promise<string> {
+    const outputPath = path.join(os.tmpdir(), `sanitized-${Date.now()}.pdf`);
+    await execFileAsync('gs', [
+      '-dNOPAUSE',
+      '-dBATCH',
+      '-dSAFER',
+      '-sDEVICE=pdfwrite',
+      `-sOutputFile=${outputPath}`,
+      inputPath,
+    ]);
+    return outputPath;
+  }
+
+  /**
+   * Räumt temporäre Bilder auf.
+   */
+  async cleanup(imagePaths: string[]): Promise<void> {
+    for (const imgPath of imagePaths) {
+      try {
+        await fs.unlink(imgPath);
+        const dir = path.dirname(imgPath);
+        await fs.rmdir(dir).catch(() => {});
+      } catch {
+        // Ignorieren
+      }
+    }
+  }
+}