Adds support for Content Security Policy

Fixes gh-2342

web/src/test/java/org/springframework/security/web/header/writers/ContentSecurityPolicyHeaderWriterTests.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2002-2016 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.header.writers;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.mock.web.MockHttpServletResponse;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Joe Grandja
+ */
+public class ContentSecurityPolicyHeaderWriterTests {
+	private static final String DEFAULT_POLICY_DIRECTIVES = "default-src 'self'";
+	private MockHttpServletRequest request;
+	private MockHttpServletResponse response;
+	private ContentSecurityPolicyHeaderWriter writer;
+
+	@Before
+	public void setup() {
+		request = new MockHttpServletRequest();
+		request.setSecure(true);
+		response = new MockHttpServletResponse();
+		writer = new ContentSecurityPolicyHeaderWriter(DEFAULT_POLICY_DIRECTIVES);
+	}
+
+	@Test
+	public void writeHeadersContentSecurityPolicyDefault() {
+		writer.writeHeaders(request, response);
+
+		assertThat(response.getHeaderNames().size()).isEqualTo(1);
+		assertThat(response.getHeader("Content-Security-Policy")).isEqualTo(DEFAULT_POLICY_DIRECTIVES);
+	}
+
+	@Test
+	public void writeHeadersContentSecurityPolicyCustom() {
+		String policyDirectives = "default-src 'self'; " +
+				"object-src plugins1.example.com plugins2.example.com; " +
+				"script-src trustedscripts.example.com";
+
+		writer = new ContentSecurityPolicyHeaderWriter(policyDirectives);
+		writer.writeHeaders(request, response);
+
+		assertThat(response.getHeaderNames().size()).isEqualTo(1);
+		assertThat(response.getHeader("Content-Security-Policy")).isEqualTo(policyDirectives);
+	}
+
+	@Test
+	public void writeHeadersContentSecurityPolicyReportOnlyDefault() {
+		writer.setReportOnly(true);
+		writer.writeHeaders(request, response);
+
+		assertThat(response.getHeaderNames().size()).isEqualTo(1);
+		assertThat(response.getHeader("Content-Security-Policy-Report-Only")).isEqualTo(DEFAULT_POLICY_DIRECTIVES);
+	}
+
+	@Test
+	public void writeHeadersContentSecurityPolicyReportOnlyCustom() {
+		String policyDirectives = "default-src https:; report-uri https://example.com/";
+
+		writer = new ContentSecurityPolicyHeaderWriter(policyDirectives);
+		writer.setReportOnly(true);
+		writer.writeHeaders(request, response);
+
+		assertThat(response.getHeaderNames().size()).isEqualTo(1);
+		assertThat(response.getHeader("Content-Security-Policy-Report-Only")).isEqualTo(policyDirectives);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void writeHeadersContentSecurityPolicyInvalid() {
+		writer = new ContentSecurityPolicyHeaderWriter("");
+		writer = new ContentSecurityPolicyHeaderWriter(null);
+	}
+
+}