Add TenantPerIssuerComponentRegistry and TenantService to how-to guide

Issue gh-663

docs/src/test/java/sample/multitenancy/TenantServiceTests.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020-2024 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package sample.multitenancy;
+
+import java.util.List;
+
+import com.nimbusds.jose.jwk.JWKSet;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.security.oauth2.server.authorization.JdbcOAuth2AuthorizationConsentService;
+import org.springframework.security.oauth2.server.authorization.JdbcOAuth2AuthorizationService;
+import org.springframework.security.oauth2.server.authorization.OAuth2AuthorizationConsentService;
+import org.springframework.security.oauth2.server.authorization.OAuth2AuthorizationService;
+import org.springframework.security.oauth2.server.authorization.client.JdbcRegisteredClientRepository;
+import org.springframework.security.oauth2.server.authorization.client.RegisteredClientRepository;
+import org.springframework.security.oauth2.server.authorization.context.AuthorizationServerContext;
+import org.springframework.security.oauth2.server.authorization.context.AuthorizationServerContextHolder;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests for {@link TenantService}.
+ *
+ * @author Steve Riesenberg
+ */
+public class TenantServiceTests {
+
+	private static final String ISSUER1 = "http://localhost:9000/issuer1";
+
+	private static final String ISSUER2 = "http://localhost:9000/issuer2";
+
+	private AuthorizationServerContext authorizationServerContext;
+
+	private TenantPerIssuerComponentRegistry componentRegistry;
+
+	private TenantService tenantService;
+
+	@BeforeEach
+	public void setUp() {
+		this.authorizationServerContext = mock(AuthorizationServerContext.class);
+		this.componentRegistry = new TenantPerIssuerComponentRegistry();
+		this.tenantService = new TenantService(this.componentRegistry);
+
+		AuthorizationServerContextHolder.setContext(this.authorizationServerContext);
+	}
+
+	@AfterEach
+	public void tearDown() {
+		AuthorizationServerContextHolder.resetContext();
+	}
+
+	@Test
+	public void testCreateTenantWhenMultipleIssuersThenCreated() {
+		this.tenantService.createTenant("issuer1");
+		this.tenantService.createTenant("issuer2");
+
+		for (String issuer : List.of(ISSUER1, ISSUER2)) {
+			when(this.authorizationServerContext.getIssuer()).thenReturn(issuer);
+			assertThat(this.componentRegistry.get(RegisteredClientRepository.class))
+					.isInstanceOf(JdbcRegisteredClientRepository.class);
+			assertThat(this.componentRegistry.get(OAuth2AuthorizationService.class))
+					.isInstanceOf(JdbcOAuth2AuthorizationService.class);
+			assertThat(this.componentRegistry.get(OAuth2AuthorizationConsentService.class))
+					.isInstanceOf(JdbcOAuth2AuthorizationConsentService.class);
+			assertThat(this.componentRegistry.get(JWKSet.class)).isNotNull();
+		}
+	}
+
+}