Local strategy (username/password) in NestJS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Passport local strategy in NestJS.

NestJS

import { [1] } from '@nestjs/passport';

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APassportModule

BJwtStrategy

CPassportStrategy

DAuthGuard

Attempts:

3 left

💡 Hint

Common Mistakes

Importing JwtStrategy instead of PassportStrategy

Importing AuthGuard which is not a strategy

Importing PassportModule which is a module, not a strategy

The PassportStrategy is imported from @nestjs/passport to implement username/password authentication.

2fill in blank

medium

Complete the constructor to inject the AuthService in the LocalStrategy class.

NestJS

constructor(private readonly [1]: AuthService) {}

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AuserService

BpassportService

ClocalService

DauthService

Attempts:

3 left

💡 Hint

Common Mistakes

Using userService which is not injected here

Using localService which is not defined

Using passportService which does not exist

The authService is injected to validate user credentials in the local strategy.

3fill in blank

hard

Fix the error in the validate method signature to properly receive username and password.

NestJS

async validate([1]: string, password: string): Promise<any> {

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Aemail

Busername

Cuser

Dlogin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'user' which is an object, not a string parameter

Using 'email' which is not the default username field

Using 'login' which is not a standard parameter name

The validate method receives username and password as parameters to check credentials.

4fill in blank

hard

Fill both blanks to correctly call the AuthService validateUser method and handle invalid user.

NestJS

const user = await this.authService.[1]([2], password);
if (!user) {
  throw new UnauthorizedException();
}

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AvalidateUser

Busername

Cemail

DcheckUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'checkUser' which is not defined

Passing 'email' instead of 'username'

Calling a method other than 'validateUser'

The validateUser method is called with username and password to verify credentials.

5fill in blank

hard

Fill all three blanks to complete the LocalStrategy class extending PassportStrategy and calling super with the correct options.

NestJS

export class LocalStrategy extends PassportStrategy([1]) {
  constructor(private readonly authService: AuthService) {
    super({ usernameField: [2] });
  }

  async validate(username: string, [3]: string): Promise<any> {
    const user = await this.authService.validateUser(username, password);
    if (!user) {
      throw new UnauthorizedException();
    }
    return user;
  }
}

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AStrategy

B'username'

Cpassword

DLocalStrategy

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'LocalStrategy' instead of 'Strategy' to PassportStrategy

Using usernameField other than 'username'

Missing the password parameter in validate method

The class extends PassportStrategy(Strategy). The super call sets usernameField to 'username'. The validate method receives username and password.