renaming and docs

src/handlers/AuthHandler.ts

@@ -0,0 +1,59 @@
+import { UserRepository } from "../repositories/UserRepository.js";
+import { encrypt } from "../utils/encryptionUtils.js";
+import { ValidationError, UnauthorizedError } from "../errors/httpErrors.js";
+import { UserDtoEntityMapper } from "../mappers/UserDtoEntityMapper.js";
+import { LoginResponseDto } from "../dtos/LoginResponseDto.js";
+import { LoginRequestDto } from "../dtos/LoginRequestDto.js";
+
+/**
+ * Controller responsible for authentication, e.g., login or issueing a token with extended
+ * lifetime
+ */
+export class AuthHandler {
+  constructor(
+    private userRepository: UserRepository,
+    private mapper: UserDtoEntityMapper
+  ) {}
+
+  /**
+   * Login: Check user and password and generate token
+   * @param loginRequest LoginRequestDto containing userName and password for login
+   * @returns LoginResponse containing token and user data for the user who just logged in
+   */
+  async login(loginRequest : LoginRequestDto): Promise<LoginResponseDto> {
+    const userName :string|undefined  = loginRequest.userName;
+    const password :string|undefined = loginRequest.password;
+    console.log("user", userName, " is trying to log in")
+    if (!userName || !password) {
+      throw new ValidationError("Username and password are required");
+    }
+
+    // Find user by userName
+    const user = await this.userRepository.findByUserName(userName);
+    // check user before trying to access password!
+    if(!user){
+      throw new UnauthorizedError("Invalid username or password");
+    }
+    // ensure user has an id - required to generate token
+    const userId = user.id;
+    if(user.id == undefined){
+      throw new UnauthorizedError("Invalid username or password");
+    }
+    // Compare password
+    const passwordMatches = encrypt.comparepassword(password, user.password);
+    if (!passwordMatches) {
+      throw new UnauthorizedError("Invalid username or password");
+    }
+
+    // Create JWT
+    const tokenInfo = encrypt.generateToken({
+      id: userId!, // ! to indicate that we've definitely checked for userId being defined
+    });
+
+    const responseDto = new LoginResponseDto();
+    responseDto.userData = this.mapper.toDto(user);
+    responseDto.token = tokenInfo.token;
+    responseDto.expiryDate = tokenInfo.expiryDate;
+    return responseDto;
+  }
+}