refactor: improve PDF splitting logic with bounds checking and fix task status response parsing

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

@@ -301,11 +301,6 @@ export class EmailImportService {
     }[];
     emailDate: string;
   }): Promise<{ success: boolean; results: any[] }> {
-    const fs = require('fs/promises');
-    const path = require('path');
-    const os = require('os');
-    const crypto = require('crypto');
-
     const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'paperless-mail-import-'));
     const results = [];
 
@@ -331,21 +326,31 @@ export class EmailImportService {
         if (att.splitRanges && att.splitRanges.length > 0) {
           // SPLIT PDF
           const pdfDoc = await PDFDocument.load(originalPdfBytes, { ignoreEncryption: true });
+          const totalPages = pdfDoc.getPageCount();
+
           for (const range of att.splitRanges) {
+            const start = Math.max(1, range.start);
+            const end = Math.min(range.end, totalPages);
+            
+            if (start > end) {
+              this.logger.warn(`Ungültiger Bereich für Splitting: ${start}-${end} (Seiten gesamt: ${totalPages})`);
+              continue;
+            }
+
             const newPdf = await PDFDocument.create();
             // Pages are 0-indexed in pdf-lib
-            const pageIndices = Array.from({ length: range.end - range.start + 1 }, (_, i) => range.start - 1 + i);
+            const pageIndices = Array.from({ length: end - start + 1 }, (_, i) => start - 1 + i);
             const copiedPages = await newPdf.copyPages(pdfDoc, pageIndices);
             copiedPages.forEach((p) => newPdf.addPage(p));
             
             const splitPdfBytes = await newPdf.save();
-            const tempFilePath = path.join(tempDir, `${baseFilename}_${range.start}-${range.end}.pdf`);
+            const tempFilePath = path.join(tempDir, `${baseFilename}_${start}-${end}.pdf`);
             await fs.writeFile(tempFilePath, Buffer.from(splitPdfBytes));
 
             uploadPromises.push({
               path: tempFilePath,
-              filename: `${baseFilename}_${range.start}-${range.end}`,
+              filename: `${baseFilename}_${start}-${end}`,
-              rangeKey: `${range.start}-${range.end}`,
+              rangeKey: `${start}-${end}`,
             });
           }
         } else {
@@ -397,7 +402,8 @@ export class EmailImportService {
              await new Promise(resolve => setTimeout(resolve, 2000));
               try {
                 const taskStatus = await this.paperlessService.getTask(paperlessTaskId);
-               const statusObj = Array.isArray(taskStatus) ? taskStatus[0] : taskStatus;
+                // Paperless returns { results: [ ... ] } for filtered tasks
+                const statusObj = taskStatus.results ? taskStatus.results[0] : (Array.isArray(taskStatus) ? taskStatus[0] : taskStatus);
                 if (statusObj && statusObj.related_document) {
                  docId = statusObj.related_document;
                  break;