OAuth2 password flow in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is OAuth2 password flow in FastAPI?

OAuth2 password flow is a way for users to log in by sending their username and password directly to the server, which then returns an access token to use for future requests.

beginner

Which FastAPI class helps implement OAuth2 password flow?

The class OAuth2PasswordBearer is used to define the token URL and handle token extraction from requests in OAuth2 password flow.

beginner

Why should passwords never be stored in plain text in OAuth2 password flow?

Storing passwords in plain text is unsafe because if the database is leaked, attackers get all passwords. Instead, passwords should be hashed to protect user data.

intermediate

What is the role of the token URL in OAuth2 password flow?

The token URL is the endpoint where the client sends username and password to get an access token. FastAPI uses this URL to handle login requests.

intermediate

How does FastAPI verify the access token after OAuth2 password flow?

FastAPI uses dependency injection with OAuth2PasswordBearer to extract the token from requests and verify it before allowing access to protected routes.

In OAuth2 password flow, what does the client send to the token URL?

A Username and password

B Only username

C Only password

D Access token

The client sends both username and password to the token URL to get an access token.

Which FastAPI class is used to extract the token from requests in OAuth2 password flow?

A OAuth2PasswordRequestForm

B OAuth2ClientCredentials

C OAuth2AuthorizationCodeBearer

D OAuth2PasswordBearer

OAuth2PasswordBearer extracts the token from the request headers.

Why is hashing passwords important in OAuth2 password flow?

A To protect passwords if the database leaks

B To store passwords in plain text

C To speed up login

D To make passwords visible to admins

Hashing protects passwords so attackers cannot read them if the database is compromised.

What does FastAPI return after successful OAuth2 password flow login?

A User's password

B Access token

C Refresh token only

D User profile data

FastAPI returns an access token to authorize future requests.

Which HTTP method is typically used to send credentials to the token URL in OAuth2 password flow?

A GET

B PUT

C POST

D DELETE

POST method is used to securely send username and password to the token URL.

Explain how OAuth2 password flow works in FastAPI from login to token verification.

Think about the steps from user login to accessing protected routes.

Describe why it is important to hash passwords and how FastAPI handles token extraction in OAuth2 password flow.

Focus on security and token handling.