refactor: extract PDF rendering and storage logic into dedicated service classes

src/services/PdfStorage.js

@@ -0,0 +1,60 @@
+const fs = require('fs');
+const path = require('path');
+const axios = require('axios');
+const logger = require('../utils/logger');
+
+class PdfStorage {
+  constructor(baseDir) {
+    this.baseDir = baseDir || path.join(process.cwd(), 'data', 'pdfs');
+    this.sessionFile = path.join(this.baseDir, 'sessions.json');
+    this.ensureDir();
+  }
+
+  ensureDir() {
+    fs.mkdirSync(this.baseDir, { recursive: true });
+  }
+
+  async downloadPdf(url) {
+    const response = await axios.get(url, { responseType: 'arraybuffer' });
+    const fileName = `pdf-${Date.now()}-${Math.random().toString(36).slice(2)}.pdf`;
+    const targetPath = path.join(this.baseDir, fileName);
+    fs.writeFileSync(targetPath, response.data);
+    return targetPath;
+  }
+
+  writeImageFile(buffer, pageIndex) {
+    const fileName = `page-${pageIndex}-${Date.now()}-${Math.random().toString(36).slice(2)}.png`;
+    const targetPath = path.join(this.baseDir, fileName);
+    fs.writeFileSync(targetPath, buffer);
+    return targetPath;
+  }
+
+  loadSessions() {
+    try {
+      if (!fs.existsSync(this.sessionFile)) return [];
+      const raw = fs.readFileSync(this.sessionFile, 'utf8');
+      return JSON.parse(raw);
+    } catch (e) {
+      logger.error('Erreur lors du chargement des sessions PDF persistées:', e);
+      return [];
+    }
+  }
+
+  saveSessions(data) {
+    try {
+      fs.writeFileSync(this.sessionFile, JSON.stringify(data, null, 2), 'utf8');
+    } catch (e) {
+      logger.error('Erreur lors de la sauvegarde des sessions PDF:', e);
+    }
+  }
+
+  deleteFiles(paths) {
+    paths.forEach(p => {
+      if (p && fs.existsSync(p)) {
+        try { fs.unlinkSync(p); } catch (e) { logger.warn('Erreur suppression fichier PDF/PNG', e); }
+      }
+    });
+  }
+}
+
+module.exports = PdfStorage;