feat: add persistent PDF storage with session management across restarts

src/commands/handlers/PdfHandler.js

@@ -13,8 +13,12 @@ const logger = require('../../utils/logger');
  */
 class PdfHandler {
   constructor() {
+    this.storageDir = process.env.PDF_STORAGE_DIR || path.join(process.cwd(), 'data', 'pdfs');
+    this.sessionFile = path.join(this.storageDir, 'sessions.json');
     this.sessions = new Map(); // messageId -> { pdfPath, totalPages, ownerId, createdAt, downloadUrl, isPublic }
     pdfjsLib.GlobalWorkerOptions.workerSrc = require('pdfjs-dist/build/pdf.worker.min.js');
+    this.ensureStorageDir();
+    this.loadSessions();
   }
 
   /**
@@ -76,6 +80,7 @@ class PdfHandler {
         downloadUrl: sourceUrl,
         isPublic
       });
+      this.saveSessions();
 
       logger.info(`PDF affiché (${totalPages} pages) par ${interaction.user.tag}`);
 
@@ -135,9 +140,10 @@ class PdfHandler {
    */
   async downloadPdf(url) {
     const response = await axios.get(url, { responseType: 'arraybuffer' });
-    const tmpPath = path.join(os.tmpdir(), `pdf-${Date.now()}-${Math.random().toString(36).slice(2)}.pdf`);
-    fs.writeFileSync(tmpPath, response.data);
-    return tmpPath;
+    const fileName = `pdf-${Date.now()}-${Math.random().toString(36).slice(2)}.pdf`;
+    const targetPath = path.join(this.storageDir, fileName);
+    fs.writeFileSync(targetPath, response.data);
+    return targetPath;
   }
 
   /**
@@ -222,6 +228,47 @@ class PdfHandler {
       return 'Visualisation PDF';
     }
   }
+
+  /**
+   * Persistance des sessions pour survivre aux redémarrages
+   */
+  ensureStorageDir() {
+    fs.mkdirSync(this.storageDir, { recursive: true });
+  }
+
+  loadSessions() {
+    try {
+      if (!fs.existsSync(this.sessionFile)) return;
+      const raw = fs.readFileSync(this.sessionFile, 'utf8');
+      const data = JSON.parse(raw);
+      data.forEach(entry => {
+        if (entry.pdfPath && fs.existsSync(entry.pdfPath)) {
+          this.sessions.set(entry.messageId, {
+            pdfPath: entry.pdfPath,
+            totalPages: entry.totalPages,
+            ownerId: entry.ownerId,
+            createdAt: entry.createdAt,
+            downloadUrl: entry.downloadUrl,
+            isPublic: entry.isPublic
+          });
+        }
+      });
+    } catch (e) {
+      logger.error('Erreur lors du chargement des sessions PDF persistées:', e);
+    }
+  }
+
+  saveSessions() {
+    try {
+      const data = [];
+      for (const [messageId, session] of this.sessions.entries()) {
+        data.push({ messageId, ...session });
+      }
+      fs.writeFileSync(this.sessionFile, JSON.stringify(data, null, 2), 'utf8');
+    } catch (e) {
+      logger.error('Erreur lors de la sauvegarde des sessions PDF:', e);
+    }
+  }
 }
 
 module.exports = PdfHandler;