Added DelegatingBearerTokenResolver

Closes gh-14644

Author: ruabtmh

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/web/DelegatingBearerTokenResolver.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2002-2024 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 org.springframework.security.oauth2.server.resource.web;
+
+import java.util.List;
+import java.util.Objects;
+
+import jakarta.servlet.http.HttpServletRequest;
+
+import org.springframework.util.Assert;
+
+/**
+ * A {@link BearerTokenResolver}, that iterates over multiple {@link BearerTokenResolver}.
+ *
+ * @author Max Batischev
+ * @since 6.3
+ */
+public class DelegatingBearerTokenResolver implements BearerTokenResolver {
+
+	private final List<BearerTokenResolver> delegates;
+
+	public DelegatingBearerTokenResolver(List<BearerTokenResolver> delegates) {
+		Assert.notEmpty(delegates, "delegates cannot be null");
+		this.delegates = delegates;
+	}
+
+	public DelegatingBearerTokenResolver(BearerTokenResolver... delegates) {
+		this.delegates = List.of(delegates);
+	}
+
+	@Override
+	public String resolve(HttpServletRequest request) {
+		return (this.delegates).stream().map((d) -> d.resolve(request)).filter(Objects::nonNull).findAny().orElse(null);
+	}
+
+}

oauth2/oauth2-resource-server/src/test/java/org/springframework/security/oauth2/server/resource/web/DelegatingBearerTokenResolverTests.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright 2002-2024 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 org.springframework.security.oauth2.server.resource.web;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.mock.web.MockHttpServletRequest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link DelegatingBearerTokenResolver}.
+ *
+ * @author Max Batischev
+ */
+public class DelegatingBearerTokenResolverTests {
+
+	private static final String X_AUTH_TOKEN_HEADER = "X-Auth-Token";
+
+	private static final String TEST_BEARER_TOKEN = "test-bearer-token";
+
+	private static final String TEST_X_AUTH_TOKEN = "test-x-auth-token";
+
+	private static final String X_AUTHORIZATION_HEADER = "x-authorization";
+
+	private static final String X_AUTHORIZATION_TOKEN = "test-x-authorization-token";
+
+	@Test
+	public void resolveWhenBearerAuthorizationHeaderIsPresentThenBearerTokenIsResolved() {
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addHeader(HttpHeaders.AUTHORIZATION, "Bearer " + TEST_BEARER_TOKEN);
+
+		DelegatingBearerTokenResolver bearerTokenResolver = resolverWithTwoDelegates();
+
+		assertThat(bearerTokenResolver.resolve(request)).isEqualTo(TEST_BEARER_TOKEN);
+	}
+
+	@Test
+	public void resolveWhenXAuthTokenHeaderIsPresentThenXAuthTokenIsResolved() {
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addHeader(X_AUTH_TOKEN_HEADER, TEST_X_AUTH_TOKEN);
+
+		DelegatingBearerTokenResolver bearerTokenResolver = resolverWithTwoDelegates();
+
+		assertThat(bearerTokenResolver.resolve(request)).isEqualTo(TEST_X_AUTH_TOKEN);
+	}
+
+	@Test
+	public void resolveWhenXAuthorizationHeaderIsPresentThenTokenIsNotResolved() {
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.addHeader(X_AUTHORIZATION_HEADER, X_AUTHORIZATION_TOKEN);
+
+		DelegatingBearerTokenResolver bearerTokenResolver = resolverWithTwoDelegates();
+
+		assertThat(bearerTokenResolver.resolve(request)).isNull();
+	}
+
+	private DelegatingBearerTokenResolver resolverWithTwoDelegates() {
+		return new DelegatingBearerTokenResolver(new DefaultBearerTokenResolver(),
+				new HeaderBearerTokenResolver(X_AUTH_TOKEN_HEADER));
+	}
+
+}