Add Jwt Client Authentication support

Closes gh-8175

Author: jgrandja

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/endpoint/AbstractOAuth2AuthorizationGrantRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 
 package org.springframework.security.oauth2.client.endpoint;
 
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
 import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.util.Assert;
 
@@ -27,20 +28,42 @@
  * @author Joe Grandja
  * @since 5.0
  * @see AuthorizationGrantType
+ * @see ClientRegistration
  * @see <a target="_blank" href="https://tools.ietf.org/html/rfc6749#section-1.3">Section
  * 1.3 Authorization Grant</a>
  */
 public abstract class AbstractOAuth2AuthorizationGrantRequest {
 
 	private final AuthorizationGrantType authorizationGrantType;
 
+	private final ClientRegistration clientRegistration;
+
 	/**
 	 * Sub-class constructor.
 	 * @param authorizationGrantType the authorization grant type
+	 * @deprecated Use
+	 * {@link #AbstractOAuth2AuthorizationGrantRequest(AuthorizationGrantType, ClientRegistration)}
+	 * instead
 	 */
+	@Deprecated
 	protected AbstractOAuth2AuthorizationGrantRequest(AuthorizationGrantType authorizationGrantType) {
 		Assert.notNull(authorizationGrantType, "authorizationGrantType cannot be null");
 		this.authorizationGrantType = authorizationGrantType;
+		this.clientRegistration = null;
+	}
+
+	/**
+	 * Sub-class constructor.
+	 * @param authorizationGrantType the authorization grant type
+	 * @param clientRegistration the client registration
+	 * @since 5.5
+	 */
+	protected AbstractOAuth2AuthorizationGrantRequest(AuthorizationGrantType authorizationGrantType,
+			ClientRegistration clientRegistration) {
+		Assert.notNull(authorizationGrantType, "authorizationGrantType cannot be null");
+		Assert.notNull(clientRegistration, "clientRegistration cannot be null");
+		this.authorizationGrantType = authorizationGrantType;
+		this.clientRegistration = clientRegistration;
 	}
 
 	/**
@@ -51,4 +74,13 @@ public AuthorizationGrantType getGrantType() {
 		return this.authorizationGrantType;
 	}
 
+	/**
+	 * Returns the {@link ClientRegistration client registration}.
+	 * @return the {@link ClientRegistration}
+	 * @since 5.5
+	 */
+	public ClientRegistration getClientRegistration() {
+		return this.clientRegistration;
+	}
+
 }