Add OAuth2AuthorizeRequest.Builder.principal(String)

Fixes gh-8018

Author: jgrandja

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/OAuth2AuthorizeRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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;
 
 import org.springframework.lang.Nullable;
+import org.springframework.security.authentication.AbstractAuthenticationToken;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.oauth2.client.registration.ClientRegistration;
 import org.springframework.util.Assert;
@@ -134,6 +135,33 @@ private Builder(OAuth2AuthorizedClient authorizedClient) {
 			this.authorizedClient = authorizedClient;
 		}
 
+		/**
+		 * Sets the name of the {@code Principal} (to be) associated to the authorized client.
+		 *
+		 * @since 5.3
+		 * @param principalName the name of the {@code Principal} (to be) associated to the authorized client
+		 * @return the {@link Builder}
+		 */
+		public Builder principal(String principalName) {
+			return principal(createAuthentication(principalName));
+		}
+
+		private static Authentication createAuthentication(final String principalName) {
+			Assert.hasText(principalName, "principalName cannot be empty");
+
+			return new AbstractAuthenticationToken(null) {
+				@Override
+				public Object getCredentials() {
+					return "";
+				}
+
+				@Override
+				public Object getPrincipal() {
+					return principalName;
+				}
+			};
+		}
+
 		/**
 		 * Sets the {@code Principal} (to be) associated to the authorized client.
 		 *

oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/OAuth2AuthorizeRequestTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -23,7 +23,9 @@
 import org.springframework.security.oauth2.core.TestOAuth2AccessTokens;
 import org.springframework.security.oauth2.core.TestOAuth2RefreshTokens;
 
-import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.entry;
 
 /**
  * Tests for {@link OAuth2AuthorizeRequest}.
@@ -58,6 +60,13 @@ public void withClientRegistrationIdWhenPrincipalIsNullThenThrowIllegalArgumentE
 				.hasMessage("principal cannot be null");
 	}
 
+	@Test
+	public void withClientRegistrationIdWhenPrincipalNameIsNullThenThrowIllegalArgumentException() {
+		assertThatThrownBy(() -> OAuth2AuthorizeRequest.withClientRegistrationId(this.clientRegistration.getRegistrationId()).principal((String) null).build())
+				.isInstanceOf(IllegalArgumentException.class)
+				.hasMessage("principalName cannot be empty");
+	}
+
 	@Test
 	public void withClientRegistrationIdWhenAllValuesProvidedThenAllValuesAreSet() {
 		OAuth2AuthorizeRequest authorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId(this.clientRegistration.getRegistrationId())
@@ -89,4 +98,15 @@ public void withAuthorizedClientWhenAllValuesProvidedThenAllValuesAreSet() {
 		assertThat(authorizeRequest.getPrincipal()).isEqualTo(this.principal);
 		assertThat(authorizeRequest.getAttributes()).contains(entry("name1", "value1"), entry("name2", "value2"));
 	}
+
+	@Test
+	public void withClientRegistrationIdWhenPrincipalNameProvidedThenPrincipalCreated() {
+		OAuth2AuthorizeRequest authorizeRequest = OAuth2AuthorizeRequest.withClientRegistrationId(this.clientRegistration.getRegistrationId())
+				.principal("principalName")
+				.build();
+
+		assertThat(authorizeRequest.getClientRegistrationId()).isEqualTo(this.clientRegistration.getRegistrationId());
+		assertThat(authorizeRequest.getAuthorizedClient()).isNull();
+		assertThat(authorizeRequest.getPrincipal().getName()).isEqualTo("principalName");
+	}
 }