Spring Security 6 & JWT Authentication · 课时

常见 OAuth2 授权类型

探索各种授权类型，例如授权码、客户端凭据，以及它们适用的场景。

常见 OAuth2 授权类型 是 CoddyKit 上的免费 Spring Security 6 & JWT Authentication 课时。这是第 3 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Spring Security 6 & JWT Authentication 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Spring Security 6 & JWT Authentication 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

What are OAuth2 Grant Types?

Welcome! In OAuth2, a Grant Type (or 'Authorization Grant') is a method an application uses to get an access token from an authorization server.

Think of it as the specific procedure or negotiation protocol for obtaining permission to access protected resources.

Why Different Grant Types?

You might wonder why there isn't just one way to get a token. Different applications have different security needs and capabilities:

Web applications with a backend
Single-page applications (SPAs) in a browser
Mobile applications
Command-line tools
Server-to-server communication

Each scenario requires a tailored, secure approach.

Authorization Code Grant

The Authorization Code Grant is the most common and recommended grant type for confidential clients, especially traditional web applications with a backend.

It's considered the most secure because the access token is never exposed directly in the user's browser.

Auth Code Flow: User Authorization

Here's how the Authorization Code flow typically starts:

The user clicks 'Login with X' on your app.
Your app redirects the user's browser to the Authorization Server (e.g., Google, GitHub).
The user logs in and grants permission to your app.
The Authorization Server then redirects the user's browser back to your app with a temporary authorization code.

Auth Code Flow: Token Exchange

After receiving the authorization code:

Your app's backend receives the authorization code.
It then securely exchanges this code (along with its own client ID and client secret) directly with the Authorization Server's token endpoint. This is a server-to-server communication.
The Authorization Server validates the code and client credentials, then issues an access token (and often a refresh token).

Client Credentials Grant

The Client Credentials Grant is used for machine-to-machine communication where there is no end-user involved.

The client (your application or service) acts on its own behalf, authenticating itself directly to the Authorization Server to get an access token.

Client Credentials Flow

The flow for Client Credentials is simpler:

Your client application (e.g., a background service) sends its client ID and client secret directly to the Authorization Server's token endpoint.
The Authorization Server verifies these credentials.
If valid, the Authorization Server directly issues an access token to your client.

No user interaction or browser redirects are needed.

Client Credentials in Action

Imagine a backend service that needs to query an external API to fetch data. It doesn't need a user to log in; it just needs access as 'itself'.

It would use the Client Credentials flow to get an access token:

curl -X POST -u "my-client-id:my-client-secret" \
  "https://auth.example.com/oauth/token" \
  -d "grant_type=client_credentials"

Device Code Grant

The Device Code Grant is designed for input-constrained devices like smart TVs, IoT devices, or command-line tools that cannot easily host a web browser or accept redirects.

It separates the authorization process, allowing the user to authorize the device on a separate, more capable device (like a smartphone or computer).

Device Code Flow

Here's a simplified Device Code flow:

The device requests a device code and a user verification URI from the Authorization Server.
The device displays the URI and a short code to the user.
The user goes to the URI on their phone/PC, logs in, and enters the code to grant access.
Meanwhile, the device repeatedly polls the Authorization Server until authorization is confirmed, then it receives the access token.

Grant Type Challenge

Based on what you've learned, which OAuth2 grant type is most suitable for a backend service that needs to access another API without any user interaction?

Recap: Grant Types in Focus

We've explored key OAuth2 grant types: Authorization Code for secure web applications with user interaction, Client Credentials for server-to-server communication, and Device Code for input-constrained devices.

Each grant type addresses specific security and usability needs, ensuring secure authorization flows for different application scenarios.

常见问题解答

「常见 OAuth2 授权类型」课时是免费的吗？

是的 — 「常见 OAuth2 授权类型」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Spring Security 6 & JWT Authentication 课程的其余内容，请升级到 CoddyKit PRO。 Spring Security 6 & JWT Authentication 课程共包含 4 节课。

「常见 OAuth2 授权类型」这节课中我会学到什么？

探索各种授权类型，例如授权码、客户端凭据，以及它们适用的场景。你通过在浏览器中直接运行的动手代码来练习 Spring Security 6 & JWT Authentication，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Spring Security 6 & JWT Authentication 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Spring Security 6 & JWT Authentication 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 3 节课，共 4 节。

「常见 OAuth2 授权类型」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Spring Security 6 & JWT Authentication 课中编写并运行代码吗？

能。每节 Spring Security 6 & JWT Authentication 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

← 返回 Spring Security 6 & JWT Authentication