feat: Seiten- und Wortzahl für den Duplikatvergleich

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

paperless-backend/src/email/email-import.service.ts

@@ -348,9 +348,13 @@ export class EmailImportService {
   }
 
   // --- Print Preview ---
-  async generatePrintPdf(
+  /**
+   * PDF eines Anhangs, optional nur der Seitenbereich (1-basiert, `end: 999`
+   * = bis zum Ende) – ohne Stempel.
+   */
+  async getAttachmentPdf(
     attachmentId: number,
-    barcodeData: any,
+    pages?: { start: number; end: number },
   ): Promise<Buffer> {
     const content = await this.contentRepo.findOne({
       where: { AttachmentEntityId: attachmentId },
@@ -358,28 +362,33 @@ export class EmailImportService {
     if (!content)
       throw new HttpException('Inhalt nicht gefunden', HttpStatus.NOT_FOUND);
 
-    let pdfBytes: Buffer = content.Content1;
+    if (!pages) return content.Content1;
 
-    const pages: { start: number; end: number } | undefined =
-      barcodeData._pages;
-    if (pages) {
-      const pdfDoc = await PDFDocument.load(pdfBytes, {
-        ignoreEncryption: true,
-      });
-      const total = pdfDoc.getPageCount();
-      const startIdx = Math.max(1, pages.start) - 1;
-      const endIdx = Math.min(pages.end === 999 ? total : pages.end, total) - 1;
-      const sliced = await PDFDocument.create();
-      const indices = Array.from(
-        { length: endIdx - startIdx + 1 },
-        (_, i) => startIdx + i,
-      );
-      const copied = await sliced.copyPages(pdfDoc, indices);
-      copied.forEach((p) => sliced.addPage(p));
-      pdfBytes = Buffer.from(await sliced.save());
-    }
+    const pdfDoc = await PDFDocument.load(content.Content1, {
+      ignoreEncryption: true,
+    });
+    const total = pdfDoc.getPageCount();
+    const startIdx = Math.max(1, pages.start) - 1;
+    const endIdx = Math.min(pages.end === 999 ? total : pages.end, total) - 1;
+    const sliced = await PDFDocument.create();
+    const indices = Array.from(
+      { length: endIdx - startIdx + 1 },
+      (_, i) => startIdx + i,
+    );
+    const copied = await sliced.copyPages(pdfDoc, indices);
+    copied.forEach((p) => sliced.addPage(p));
+    return Buffer.from(await sliced.save());
+  }
 
+  async generatePrintPdf(
+    attachmentId: number,
+    barcodeData: any,
+  ): Promise<Buffer> {
     const { _pages, ...barcode } = barcodeData;
+    const pdfBytes = await this.getAttachmentPdf(
+      attachmentId,
+      _pages as { start: number; end: number } | undefined,
+    );
     return this.applyBarcodeToPdf(pdfBytes, barcode);
   }