Add reactive support for Referrer-Policy security header

web/src/test/java/org/springframework/security/web/server/header/ReferrerPolicyServerHttpHeadersWriterTests.java

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+/*
+ * Copyright 2002-2018 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
+ *
+ *      http://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.web.server.header;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
+import org.springframework.mock.web.server.MockServerWebExchange;
+import org.springframework.security.web.server.header.ReferrerPolicyServerHttpHeadersWriter.ReferrerPolicy;
+import org.springframework.web.server.ServerWebExchange;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ReferrerPolicyServerHttpHeadersWriter}.
+ *
+ * @author Vedran Pavic
+ */
+public class ReferrerPolicyServerHttpHeadersWriterTests {
+
+	private ServerWebExchange exchange;
+
+	private ReferrerPolicyServerHttpHeadersWriter writer;
+
+	@Before
+	public void setup() {
+		this.exchange = MockServerWebExchange.from(MockServerHttpRequest.get("/"));
+		this.writer = new ReferrerPolicyServerHttpHeadersWriter();
+	}
+
+	@Test
+	public void writeHeadersWhenUsingDefaultsThenDoesNotWrite() {
+		this.writer.writeHttpHeaders(this.exchange);
+
+		HttpHeaders headers = this.exchange.getResponse().getHeaders();
+		assertThat(headers).hasSize(1);
+		assertThat(headers.get(ReferrerPolicyServerHttpHeadersWriter.REFERRER_POLICY))
+				.containsOnly(ReferrerPolicy.NO_REFERRER.getPolicy());
+	}
+
+	@Test
+	public void writeHeadersWhenUsingPolicyThenWritesPolicy() {
+		this.writer.setPolicy(ReferrerPolicy.SAME_ORIGIN);
+		this.writer.writeHttpHeaders(this.exchange);
+
+		HttpHeaders headers = this.exchange.getResponse().getHeaders();
+		assertThat(headers).hasSize(1);
+		assertThat(headers.get(ReferrerPolicyServerHttpHeadersWriter.REFERRER_POLICY))
+				.containsOnly(ReferrerPolicy.SAME_ORIGIN.getPolicy());
+	}
+
+	@Test
+	public void writeHeadersWhenAlreadyWrittenThenWritesHeader() {
+		String headerValue = ReferrerPolicy.SAME_ORIGIN.getPolicy();
+		this.exchange.getResponse().getHeaders()
+				.set(ReferrerPolicyServerHttpHeadersWriter.REFERRER_POLICY, headerValue);
+		this.writer.writeHttpHeaders(this.exchange);
+
+		HttpHeaders headers = this.exchange.getResponse().getHeaders();
+		assertThat(headers).hasSize(1);
+		assertThat(headers.get(ReferrerPolicyServerHttpHeadersWriter.REFERRER_POLICY))
+				.containsOnly(headerValue);
+	}
+
+}