create use cases for auth

src/modules/auth/use-cases/logout-use-case.ts

@@ -0,0 +1,30 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs'
+import { Logger } from '@nestjs/common'
+import { UsersRepository } from '../../users/infrastructure/users.repository'
+import jwt from 'jsonwebtoken'
+
+export class LogoutCommand {
+  constructor(public readonly refreshToken: string) {}
+}
+
+@CommandHandler(LogoutCommand)
+export class LogoutHandler implements ICommandHandler<LogoutCommand> {
+  constructor(private readonly usersRepository: UsersRepository) {}
+
+  private readonly logger = new Logger(LogoutHandler.name)
+
+  async execute(command: LogoutCommand) {
+    const token = command.refreshToken
+
+    const secretKey = process.env.JWT_SECRET_KEY
+    if (!secretKey) throw new Error('JWT_SECRET_KEY is not defined')
+
+    try {
+      const decoded: any = jwt.verify(token, secretKey)
+      return this.usersRepository.revokeToken(decoded.userId, token)
+    } catch (e) {
+      this.logger.log(`Decoding error: ${e}`)
+      return null
+    }
+  }
+}