Merge pull request #24680 from pedivo

* gh-24680:
  Polish "Add config prop for endpoints' CORS allowed origin patterns"
  Add config prop for endpoints' CORS allowed origin patterns

Closes gh-24680

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/CorsEndpointProperties.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -37,11 +37,21 @@ import org.springframework.web.cors.CorsConfiguration;
 public class CorsEndpointProperties {
 
 	/**
-	 * Comma-separated list of origins to allow. '*' allows all origins. When not set,
+	 * Comma-separated list of origins to allow. '*' allows all origins. When credentials
-	 * CORS support is disabled.
+	 * are allowed, '*' cannot be used and origin patterns should be configured instead.
+	 * When no allowed origins or allowed origin patterns are set, CORS support is
+	 * disabled.
 	 */
 	private List<String> allowedOrigins = new ArrayList<>();
 
+	/**
+	 * Comma-separated list of origin patterns to allow. Unlike allowed origins which only
+	 * supports '*', origin patterns are more flexible (for example
+	 * 'https://*.example.com') and can be used when credentials are allowed. When no
+	 * allowed origin patterns or allowed origins are set, CORS support is disabled.
+	 */
+	private List<String> allowedOriginPatterns = new ArrayList<>();
+
 	/**
 	 * Comma-separated list of methods to allow. '*' allows all methods. When not set,
 	 * defaults to GET.
@@ -78,6 +88,14 @@ public class CorsEndpointProperties {
 		this.allowedOrigins = allowedOrigins;
 	}
 
+	public List<String> getAllowedOriginPatterns() {
+		return this.allowedOriginPatterns;
+	}
+
+	public void setAllowedOriginPatterns(List<String> allowedOriginPatterns) {
+		this.allowedOriginPatterns = allowedOriginPatterns;
+	}
+
 	public List<String> getAllowedMethods() {
 		return this.allowedMethods;
 	}
@@ -119,12 +137,13 @@ public class CorsEndpointProperties {
 	}
 
 	public CorsConfiguration toCorsConfiguration() {
-		if (CollectionUtils.isEmpty(this.allowedOrigins)) {
+		if (CollectionUtils.isEmpty(this.allowedOrigins) && CollectionUtils.isEmpty(this.allowedOriginPatterns)) {
 			return null;
 		}
 		PropertyMapper map = PropertyMapper.get();
 		CorsConfiguration configuration = new CorsConfiguration();
 		map.from(this::getAllowedOrigins).to(configuration::setAllowedOrigins);
+		map.from(this::getAllowedOriginPatterns).to(configuration::setAllowedOriginPatterns);
 		map.from(this::getAllowedHeaders).whenNot(CollectionUtils::isEmpty).to(configuration::setAllowedHeaders);
 		map.from(this::getAllowedMethods).whenNot(CollectionUtils::isEmpty).to(configuration::setAllowedMethods);
 		map.from(this::getExposedHeaders).whenNot(CollectionUtils::isEmpty).to(configuration::setExposedHeaders);

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/WebFluxEndpointCorsIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -71,6 +71,19 @@ class WebFluxEndpointCorsIntegrationTests {
 				}));
 	}
 
+	@Test
+	void settingAllowedOriginPatternsEnablesCors() {
+		this.contextRunner
+				.withPropertyValues("management.endpoints.web.cors.allowed-origin-patterns:*.example.org",
+						"management.endpoints.web.cors.allow-credentials:true")
+				.run(withWebTestClient((webTestClient) -> {
+					webTestClient.options().uri("/actuator/beans").header("Origin", "spring.example.com")
+							.header(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD, "GET").exchange().expectStatus()
+							.isForbidden();
+					performAcceptedCorsRequest(webTestClient, "/actuator/beans");
+				}));
+	}
+
 	@Test
 	void maxAgeDefaultsTo30Minutes() {
 		this.contextRunner.withPropertyValues("management.endpoints.web.cors.allowed-origins:spring.example.org")

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/WebMvcEndpointCorsIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -77,6 +77,17 @@ class WebMvcEndpointCorsIntegrationTests {
 				}));
 	}
 
+	@Test
+	void settingAllowedOriginPatternsEnablesCors() {
+		this.contextRunner.withPropertyValues("management.endpoints.web.cors.allowed-origin-patterns:*.example.com",
+				"management.endpoints.web.cors.allow-credentials:true").run(withMockMvc((mockMvc) -> {
+					mockMvc.perform(options("/actuator/beans").header("Origin", "bar.example.org")
+							.header(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD, "GET"))
+							.andExpect(status().isForbidden());
+					performAcceptedCorsRequest(mockMvc);
+				}));
+	}
+
 	@Test
 	void maxAgeDefaultsTo30Minutes() {
 		this.contextRunner.withPropertyValues("management.endpoints.web.cors.allowed-origins:foo.example.com")