feat: support selective page range extraction for email attachment print previews

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

@@ -158,7 +158,24 @@ export class EmailImportService {
   async generatePrintPdf(attachmentId: number, barcodeData: any): Promise<Buffer> {
     const content = await this.contentRepo.findOne({ where: { AttachmentEntityId: attachmentId } });
     if (!content) throw new HttpException('Inhalt nicht gefunden', HttpStatus.NOT_FOUND);
-    return this.applyBarcodeToPdf(content.Content1, barcodeData);
+
+    let pdfBytes: Buffer = 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 { _pages, ...barcode } = barcodeData;
+    return this.applyBarcodeToPdf(pdfBytes, barcode);
   }
 
   async applyBarcodeToPdf(pdfBytes: Buffer, barcodeData: any): Promise<Buffer> {

paperless-frontend/src/api/email-import.ts

@@ -50,8 +50,8 @@ export const emailImportApi = {
     await api.post('/api/email-import/belegnummer/release', { date: dateStr, number });
   },
 
-  printPreview: async (attachmentId: number, barcodeData: any): Promise<Blob> => {
+  printPreview: async (attachmentId: number, barcodeData: any, pages?: { start: number; end: number }): Promise<Blob> => {
-    const res = await api.post(`/api/email-import/attachments/${attachmentId}/print-preview`, barcodeData, {
+    const res = await api.post(`/api/email-import/attachments/${attachmentId}/print-preview`, { ...barcodeData, _pages: pages }, {
       responseType: 'blob',
     });
     return res.data;

paperless-frontend/src/components/MailImportWizard.tsx

@@ -366,7 +366,10 @@ export default function MailImportWizard({ visible, onClose, email, attachments
         return;
       }
 
-      const blob = await emailImportApi.printPreview(attachmentId, barcode);
+      const item = importData.find(i => i.virtualId === virtualId);
+      const pages = item?.pages;
+
+      const blob = await emailImportApi.printPreview(attachmentId, barcode, pages);
       const url = window.URL.createObjectURL(blob);
       
       // Navigate the already open window to the PDF