= OAuth Migrations

The following steps relate to changes around how to configure OAuth 2.0.

== Default authorities for oauth2Login()

In Spring Security 5, the default `GrantedAuthority` given to a user that authenticates with an OAuth2 or OpenID Connect 1.0 provider (via `oauth2Login()`) is `ROLE_USER`.

[NOTE]
====
See xref:servlet/oauth2/login/advanced.adoc#oauth2login-advanced-map-authorities[Mapping User Authorities] for more information.
====

In Spring Security 6, the default authority given to a user authenticating with an OAuth2 provider is `OAUTH2_USER`.
The default authority given to a user authenticating with an OpenID Connect 1.0 provider is `OIDC_USER`.
These defaults allow clearer distinction of users that have authenticated with an OAuth2 or OpenID Connect 1.0 provider.

If you are using authorization rules or expressions such as `hasRole("USER")` or `hasAuthority("ROLE_USER")` to authorize users with this specific authority, the new defaults in Spring Security 6 will impact your application.

To opt into the new Spring Security 6 defaults, the following configuration can be used.

.Configure oauth2Login() with 6.0 defaults
====
.Java
[source,java,role="primary"]
----
@Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
	http
		// ...
		.oauth2Login((oauth2Login) -> oauth2Login
			.userInfoEndpoint((userInfo) -> userInfo
				.userAuthoritiesMapper(grantedAuthoritiesMapper())
			)
		);
	return http.build();
}

private GrantedAuthoritiesMapper grantedAuthoritiesMapper() {
	return (authorities) -> {
		Set<GrantedAuthority> mappedAuthorities = new HashSet<>();

		authorities.forEach((authority) -> {
			GrantedAuthority mappedAuthority;

			if (authority instanceof OidcUserAuthority) {
				OidcUserAuthority userAuthority = (OidcUserAuthority) authority;
				mappedAuthority = new OidcUserAuthority(
					"OIDC_USER", userAuthority.getIdToken(), userAuthority.getUserInfo());
			} else if (authority instanceof OAuth2UserAuthority) {
				OAuth2UserAuthority userAuthority = (OAuth2UserAuthority) authority;
				mappedAuthority = new OAuth2UserAuthority(
					"OAUTH2_USER", userAuthority.getAttributes());
			} else {
				mappedAuthority = authority;
			}

			mappedAuthorities.add(mappedAuthority);
		});

		return mappedAuthorities;
	};
}
----

.Kotlin
[source,kotlin,role="secondary"]
----
@Bean
fun securityFilterChain(http: HttpSecurity): SecurityFilterChain {
	http {
		// ...
		oauth2Login {
			userInfoEndpoint {
				userAuthoritiesMapper = grantedAuthoritiesMapper()
			}
		}
	}
	return http.build()
}

private fun grantedAuthoritiesMapper(): GrantedAuthoritiesMapper {
	return GrantedAuthoritiesMapper { authorities ->
		authorities.map { authority ->
			when (authority) {
				is OidcUserAuthority ->
					OidcUserAuthority("OIDC_USER", authority.idToken, authority.userInfo)
				is OAuth2UserAuthority ->
					OAuth2UserAuthority("OAUTH2_USER", authority.attributes)
				else -> authority
			}
		}
	}
}
----

.XML
[source,xml,role="secondary"]
----
<http>
	<oauth2-login user-authorities-mapper-ref="userAuthoritiesMapper" ... />
</http>
----
====

[[servlet-oauth2-login-authorities-opt-out]]
=== Opt-out Steps

If configuring the new authorities gives you trouble, you can opt out and explicitly use the 5.8 authority of `ROLE_USER` with the following configuration.

.Configure oauth2Login() with 5.8 defaults
====
.Java
[source,java,role="primary"]
----
@Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
	http
		// ...
		.oauth2Login((oauth2Login) -> oauth2Login
			.userInfoEndpoint((userInfo) -> userInfo
				.userAuthoritiesMapper(grantedAuthoritiesMapper())
			)
		);
	return http.build();
}

private GrantedAuthoritiesMapper grantedAuthoritiesMapper() {
	return (authorities) -> {
		Set<GrantedAuthority> mappedAuthorities = new HashSet<>();

		authorities.forEach((authority) -> {
			GrantedAuthority mappedAuthority;

			if (authority instanceof OidcUserAuthority) {
				OidcUserAuthority userAuthority = (OidcUserAuthority) authority;
				mappedAuthority = new OidcUserAuthority(
					"ROLE_USER", userAuthority.getIdToken(), userAuthority.getUserInfo());
			} else if (authority instanceof OAuth2UserAuthority) {
				OAuth2UserAuthority userAuthority = (OAuth2UserAuthority) authority;
				mappedAuthority = new OAuth2UserAuthority(
					"ROLE_USER", userAuthority.getAttributes());
			} else {
				mappedAuthority = authority;
			}

			mappedAuthorities.add(mappedAuthority);
		});

		return mappedAuthorities;
	};
}
----

.Kotlin
[source,kotlin,role="secondary"]
----
@Bean
fun securityFilterChain(http: HttpSecurity): SecurityFilterChain {
	http {
		// ...
		oauth2Login {
			userInfoEndpoint {
				userAuthoritiesMapper = grantedAuthoritiesMapper()
			}
		}
	}
	return http.build()
}

private fun grantedAuthoritiesMapper(): GrantedAuthoritiesMapper {
	return GrantedAuthoritiesMapper { authorities ->
		authorities.map { authority ->
			when (authority) {
				is OidcUserAuthority ->
					OidcUserAuthority("ROLE_USER", authority.idToken, authority.userInfo)
				is OAuth2UserAuthority ->
					OAuth2UserAuthority("ROLE_USER", authority.attributes)
				else -> authority
			}
		}
	}
}
----

.XML
[source,xml,role="secondary"]
----
<http>
	<oauth2-login user-authorities-mapper-ref="userAuthoritiesMapper" ... />
</http>
----
====

== Deprecations in OAuth2 Client

In Spring Security 6, deprecated classes and methods were removed from xref:servlet/oauth2/client/index.adoc[OAuth2 Client].
Each deprecation is listed below, along with a direct replacement.

=== `ServletOAuth2AuthorizedClientExchangeFilterFunction`

The method `setAccessTokenExpiresSkew(...)` can be replaced with one of:

* `ClientCredentialsOAuth2AuthorizedClientProvider#setClockSkew(...)`
* `RefreshTokenOAuth2AuthorizedClientProvider#setClockSkew(...)`
* `JwtBearerOAuth2AuthorizedClientProvider#setClockSkew(...)`

The method `setClientCredentialsTokenResponseClient(...)` can be replaced with the constructor `ServletOAuth2AuthorizedClientExchangeFilterFunction(OAuth2AuthorizedClientManager)`.

[NOTE]
====
See xref:servlet/oauth2/client/authorization-grants.adoc#oauth2Client-client-creds-grant[Client Credentials] for more information.
====

=== `OidcUserInfo`

The method `phoneNumberVerified(String)` can be replaced with `phoneNumberVerified(Boolean)`.

=== `OAuth2AuthorizedClientArgumentResolver`

The method `setClientCredentialsTokenResponseClient(...)` can be replaced with the constructor `OAuth2AuthorizedClientArgumentResolver(OAuth2AuthorizedClientManager)`.

[NOTE]
====
See xref:servlet/oauth2/client/authorization-grants.adoc#oauth2Client-client-creds-grant[Client Credentials] for more information.
====

=== `ClaimAccessor`

The method `containsClaim(...)` can be replaced with `hasClaim(...)`.

=== `OidcClientInitiatedLogoutSuccessHandler`

The method `setPostLogoutRedirectUri(URI)` can be replaced with `setPostLogoutRedirectUri(String)`.

=== `HttpSessionOAuth2AuthorizationRequestRepository`

The method `setAllowMultipleAuthorizationRequests(...)` has no direct replacement.

=== `AuthorizationRequestRepository`

The method `removeAuthorizationRequest(HttpServletRequest)` can be replaced with `removeAuthorizationRequest(HttpServletRequest, HttpServletResponse)`.

=== `ClientRegistration`

The method `getRedirectUriTemplate()` can be replaced with `getRedirectUri()`.

=== `ClientRegistration.Builder`

The method `redirectUriTemplate(...)` can be replaced with `redirectUri(...)`.

=== `AbstractOAuth2AuthorizationGrantRequest`

The constructor `AbstractOAuth2AuthorizationGrantRequest(AuthorizationGrantType)` can be replaced with `AbstractOAuth2AuthorizationGrantRequest(AuthorizationGrantType, ClientRegistration)`.

=== `ClientAuthenticationMethod`

The static field `BASIC` can be replaced with `CLIENT_SECRET_BASIC`.

The static field `POST` can be replaced with `CLIENT_SECRET_POST`.

=== `OAuth2AccessTokenResponseHttpMessageConverter`

The field `tokenResponseConverter` has no direct replacement.

The method `setTokenResponseConverter(...)` can be replaced with `setAccessTokenResponseConverter(...)`.

The field `tokenResponseParametersConverter` has no direct replacement.

The method `setTokenResponseParametersConverter(...)` can be replaced with `setAccessTokenResponseParametersConverter(...)`.

=== `NimbusAuthorizationCodeTokenResponseClient`

The class `NimbusAuthorizationCodeTokenResponseClient` can be replaced with `DefaultAuthorizationCodeTokenResponseClient`.

=== `NimbusJwtDecoderJwkSupport`

The class `NimbusJwtDecoderJwkSupport` can be replaced with `NimbusJwtDecoder` or `JwtDecoders`.

=== `ImplicitGrantConfigurer`

The class `ImplicitGrantConfigurer` has no direct replacement.

[WARNING]
====
Use of the `implicit` grant type is not recommended and all related support is removed in Spring Security 6.
====

=== `AuthorizationGrantType`

The static field `IMPLICIT` has no direct replacement.

[WARNING]
====
Use of the `implicit` grant type is not recommended and all related support is removed in Spring Security 6.
====

=== `OAuth2AuthorizationResponseType`

The static field `TOKEN` has no direct replacement.

[WARNING]
====
Use of the `implicit` grant type is not recommended and all related support is removed in Spring Security 6.
====

=== `OAuth2AuthorizationRequest`

The static method `implicit()` has no direct replacement.

[WARNING]
====
Use of the `implicit` grant type is not recommended and all related support is removed in Spring Security 6.
====

== Deprecations in OAuth2 Resource Server

In Spring Security 6, deprecated classes and methods were removed from xref:servlet/oauth2/resource-server/index.adoc[OAuth2 Resource Server].
Each deprecation is listed below, along with a direct replacement.

=== `JwtAuthenticationConverter`

The method `extractAuthorities(...)` can be replaced with `JwtGrantedAuthoritiesConverter#convert(...)`.

