FEAT: Adiciona camada de storage de mídia (LocalDiskAdapter)

- MediaStorageService com interface upload/getUrl/delete
- LocalDiskAdapter salva em /uploads/media/ com UUID + extensão por mimetype
- Cria o diretório automaticamente no boot
- BASE_URL adicionado ao .env.example
- MediaStorageService e LocalDiskAdapter registrados no WhatsappModule

.env.example

@@ -12,6 +12,7 @@ DB_NAME=omnichannel
 
 # HTTP/JWT
 FRONTEND_URL=http://localhost:3000
+BASE_URL=http://localhost:3001
 JWT_SECRET=change-this-long-random-secret
 JWT_EXPIRES_IN=8h
 

src/modules/whatsapp/media/adapters/local-disk.adapter.ts

@@ -0,0 +1,48 @@
+import { Injectable, Logger } from '@nestjs/common';
+import * as fs from 'fs';
+import * as path from 'path';
+import { randomUUID } from 'crypto';
+
+const UPLOAD_DIR = path.resolve(process.cwd(), 'uploads', 'media');
+
+const MIME_TO_EXT: Record<string, string> = {
+  'image/jpeg':       '.jpg',
+  'image/png':        '.png',
+  'image/webp':       '.webp',
+  'audio/ogg':        '.ogg',
+  'audio/mpeg':       '.mp3',
+  'audio/mp4':        '.m4a',
+  'audio/amr':        '.amr',
+  'video/mp4':        '.mp4',
+  'video/3gpp':       '.3gp',
+  'application/pdf':  '.pdf',
+  'application/vnd.openxmlformats-officedocument.wordprocessingml.document':   '.docx',
+  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet':         '.xlsx',
+  'application/vnd.openxmlformats-officedocument.presentationml.presentation': '.pptx',
+};
+
+@Injectable()
+export class LocalDiskAdapter {
+  private readonly logger = new Logger(LocalDiskAdapter.name);
+
+  constructor() {
+    fs.mkdirSync(UPLOAD_DIR, { recursive: true });
+  }
+
+  async upload(buffer: Buffer, mimeType: string): Promise<string> {
+    const ext = MIME_TO_EXT[mimeType] ?? '.bin';
+    const filename = `${randomUUID()}${ext}`;
+    const filepath = path.join(UPLOAD_DIR, filename);
+    fs.writeFileSync(filepath, buffer);
+    this.logger.log(`Mídia salva: ${filepath}`);
+    return `/uploads/media/${filename}`;
+  }
+
+  delete(relativePath: string): void {
+    try {
+      fs.unlinkSync(path.join(process.cwd(), relativePath));
+    } catch {
+      this.logger.warn(`Falha ao deletar mídia: ${relativePath}`);
+    }
+  }
+}

src/modules/whatsapp/media/media-storage.service.ts

@@ -0,0 +1,20 @@
+import { Injectable } from '@nestjs/common';
+import { LocalDiskAdapter } from './adapters/local-disk.adapter';
+
+@Injectable()
+export class MediaStorageService {
+  constructor(private readonly disk: LocalDiskAdapter) {}
+
+  async upload(buffer: Buffer, mimeType: string): Promise<string> {
+    return this.disk.upload(buffer, mimeType);
+  }
+
+  getUrl(relativePath: string): string {
+    const base = (process.env.BASE_URL ?? 'http://localhost:3001').replace(/\/$/, '');
+    return `${base}${relativePath}`;
+  }
+
+  delete(relativePath: string): void {
+    this.disk.delete(relativePath);
+  }
+}

src/modules/whatsapp/whatsapp.module.ts

@@ -11,6 +11,8 @@ import { WhatsappTemplateService } from './whatsapp-template.service';
 import { MensagensRepository } from './repositories/mensagens.repository';
 import { WhatsappConfigRepository } from './repositories/whatsapp-config.repository';
 import { WhatsappConfigService } from './whatsapp-config.service';
+import { MediaStorageService } from './media/media-storage.service';
+import { LocalDiskAdapter } from './media/adapters/local-disk.adapter';
 
 @Module({
   imports: [AttendanceModule, AuthModule, ContactsModule],
@@ -22,6 +24,8 @@ import { WhatsappConfigService } from './whatsapp-config.service';
     MensagensRepository,
     WhatsappConfigRepository,
     WhatsappConfigService,
+    MediaStorageService,
+    LocalDiskAdapter,
   ],
   controllers: [WhatsappController, WhatsappAdminController],
   exports: [WhatsappService],