[[overview]]
= Overview

This site contains reference documentation and how-to guides for Spring Authorization Server.

[[introducing-spring-authorization-server]]
== Introducing Spring Authorization Server

Spring Authorization Server is a framework that provides implementations of the https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07[OAuth 2.1] and https://openid.net/specs/openid-connect-core-1_0.html[OpenID Connect 1.0] specifications and other related specifications.
It is built on top of https://spring.io/projects/spring-security[Spring Security] to provide a secure, light-weight, and customizable foundation for building OpenID Connect 1.0 Identity Providers and OAuth2 Authorization Server products.

[[use-cases]]
== Use Cases

The following list provides some use cases for using Spring Authorization Server compared to using an open source or commercial OAuth2 or OpenID Connect 1.0 Provider product.

* Provides full control of configuration and customization when advanced customization scenarios are required.
* Preference for a light-weight authorization server compared to a commercial product that includes all the "bells and whistles".
* Potential savings in software licensing and/or hosting costs.
* Quick startup and ease of use during development using the familiar Spring programming model.

[[feature-list]]
== Feature List

Spring Authorization Server supports the following features:

[cols="2a,4a,6a"]
|===
|Category |Feature |Related specifications

|xref:protocol-endpoints.adoc#oauth2-token-endpoint[Authorization Grant]
|
* Authorization Code
** xref:protocol-endpoints.adoc#oauth2-authorization-endpoint[User Consent]
* Client Credentials
* Refresh Token
* Device Code
** xref:protocol-endpoints.adoc#oauth2-device-verification-endpoint[User Consent]
* Token Exchange
|
* The OAuth 2.1 Authorization Framework (https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07[draft])
** https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-4.1[Authorization Code Grant]
** https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-4.2[Client Credentials Grant]
** https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-4.3[Refresh Token Grant]
* OpenID Connect Core 1.0 (https://openid.net/specs/openid-connect-core-1_0.html[spec])
** https://openid.net/specs/openid-connect-core-1_0.html#CodeFlowAuth[Authorization Code Flow]
* OAuth 2.0 Device Authorization Grant
(https://tools.ietf.org/html/rfc8628[spec])
** https://tools.ietf.org/html/rfc8628#section-3[Device Flow]
* OAuth 2.0 Token Exchange (https://datatracker.ietf.org/doc/html/rfc8693[spec])
** https://datatracker.ietf.org/doc/html/rfc8693#section-2[Token Exchange Flow]

|xref:core-model-components.adoc#oauth2-token-generator[Token Formats]
|
* Self-contained (JWT)
* Reference (Opaque)
|
* JSON Web Token (JWT) (https://tools.ietf.org/html/rfc7519[RFC 7519])
* JSON Web Signature (JWS) (https://tools.ietf.org/html/rfc7515[RFC 7515])

|xref:configuration-model.adoc#configuring-client-authentication[Client Authentication]
|
* `client_secret_basic`
* `client_secret_post`
* `client_secret_jwt`
* `private_key_jwt`
* `tls_client_auth`
* `self_signed_tls_client_auth`
* `none` (public clients)
|
* The OAuth 2.1 Authorization Framework (https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-2.4[Client Authentication])
* JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication (https://tools.ietf.org/html/rfc7523[RFC 7523])
* OAuth 2.0 Mutual-TLS Client Authentication and Certificate-Bound Access Tokens (https://datatracker.ietf.org/doc/html/rfc8705[RFC 8705])
* Proof Key for Code Exchange by OAuth Public Clients (PKCE) (https://tools.ietf.org/html/rfc7636[RFC 7636])

|xref:protocol-endpoints.adoc[Protocol Endpoints]
|
* xref:protocol-endpoints.adoc#oauth2-authorization-endpoint[OAuth2 Authorization Endpoint]
* xref:protocol-endpoints.adoc#oauth2-device-authorization-endpoint[OAuth2 Device Authorization Endpoint]
* xref:protocol-endpoints.adoc#oauth2-device-verification-endpoint[OAuth2 Device Verification Endpoint]
* xref:protocol-endpoints.adoc#oauth2-token-endpoint[OAuth2 Token Endpoint]
* xref:protocol-endpoints.adoc#oauth2-token-introspection-endpoint[OAuth2 Token Introspection Endpoint]
* xref:protocol-endpoints.adoc#oauth2-token-revocation-endpoint[OAuth2 Token Revocation Endpoint]
* xref:protocol-endpoints.adoc#oauth2-authorization-server-metadata-endpoint[OAuth2 Authorization Server Metadata Endpoint]
* xref:protocol-endpoints.adoc#jwk-set-endpoint[JWK Set Endpoint]
* xref:protocol-endpoints.adoc#oidc-provider-configuration-endpoint[OpenID Connect 1.0 Provider Configuration Endpoint]
* xref:protocol-endpoints.adoc#oidc-logout-endpoint[OpenID Connect 1.0 Logout Endpoint]
* xref:protocol-endpoints.adoc#oidc-user-info-endpoint[OpenID Connect 1.0 UserInfo Endpoint]
* xref:protocol-endpoints.adoc#oidc-client-registration-endpoint[OpenID Connect 1.0 Client Registration Endpoint]
|
* The OAuth 2.1 Authorization Framework (https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07[draft])
** https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-3.1[Authorization Endpoint]
** https://datatracker.ietf.org/doc/html/draft-ietf-oauth-v2-1-07#section-3.2[Token Endpoint]
* OAuth 2.0 Device Authorization Grant (https://tools.ietf.org/html/rfc8628[RFC 8628])
** https://tools.ietf.org/html/rfc8628#section-3.1[Device Authorization Endpoint]
** https://tools.ietf.org/html/rfc8628#section-3.3[Device Verification Endpoint]
* OAuth 2.0 Token Introspection (https://tools.ietf.org/html/rfc7662[RFC 7662])
* OAuth 2.0 Token Revocation (https://tools.ietf.org/html/rfc7009[RFC 7009])
* OAuth 2.0 Authorization Server Metadata (https://tools.ietf.org/html/rfc8414[RFC 8414])
* JSON Web Key (JWK) (https://tools.ietf.org/html/rfc7517[RFC 7517])
* OpenID Connect Discovery 1.0 (https://openid.net/specs/openid-connect-discovery-1_0.html[spec])
** https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfig[Provider Configuration Endpoint]
* OpenID Connect RP-Initiated Logout 1.0 (https://openid.net/specs/openid-connect-rpinitiated-1_0.html[spec])
** https://openid.net/specs/openid-connect-rpinitiated-1_0.html#RPLogout[Logout Endpoint]
* OpenID Connect Core 1.0 (https://openid.net/specs/openid-connect-core-1_0.html[spec])
** https://openid.net/specs/openid-connect-core-1_0.html#UserInfo[UserInfo Endpoint]
* OpenID Connect Dynamic Client Registration 1.0 (https://openid.net/specs/openid-connect-registration-1_0.html[spec])
** https://openid.net/specs/openid-connect-registration-1_0.html#ClientRegistration[Client Registration Endpoint]
** https://openid.net/specs/openid-connect-registration-1_0.html#ClientConfigurationEndpoint[Client Configuration Endpoint]
|===
