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oauth 2.0 tutorial: simplified

what is oauth 2.0?

oauth 2.0 is an authorization framework that enables third-party applications to obtain limited access to a user's resources without exposing their credentials. it allows users to grant access to their information on one site (like google or facebook) to another site without sharing their password.

key concepts

1. **resource owner**: the user who owns the data and can grant access.

2. **client**: the application that wants to access the user's data (e.g., your web app or mobile app).

3. **authorization server**: the server that handles the authentication and issues access tokens (e.g., google, facebook).

4. **resource server**: the server that hosts the user's data and accepts access tokens (e.g., google apis).

5. **access token**: a token that the client uses to access the resource server on behalf of the user.

6. **refresh token**: a token that can be used to obtain a new access token when the current one expires.

oauth 2.0 flow

1. **authorization request**: the client redirects the user to the authorization server to request access.
2. **user authorization**: the user logs in and grants access to the client.
3. **authorization code**: the authorization server redirects the user back to the client with an authorization code.
4. **access token request**: the client exchanges the authorization code for an access token.
5. **access resource**: the client uses the access token to access the user's data from the resource server.

example scenario

let's assume you want to allow users to log into your application using their google account.

step-by-step implementation

step 1: register your application

1. go to the [google developers console](https://console.developers.google.com/).
2. create a new project.
3. enable the "google+ api" or any api you want to access.
4. go to "credentials" and create oauth 2.0 credentials.
5. set the authorized redirect uri (e.g., `http://localhost:5000/callback`).

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#OAuth2 #SimpleExplanation #numpy
OAuth 2
authentication
authorization
access tokens
secure API access
user consent
third-party applications
resource server
client ID
redirect URI
bearer tokens
scopes
login flow
security protocol
delegated access