Polish "Expose Elastic's apiKeyCredentials property"

See gh-28400

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfiguration.java

@@ -32,6 +32,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.context.properties.source.MutuallyExclusiveConfigurationPropertiesException;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -60,6 +61,14 @@ public class ElasticMetricsExportAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean
 	public ElasticConfig elasticConfig() {
+		MutuallyExclusiveConfigurationPropertiesException.throwIfMultipleNonNullValuesIn((entries) -> {
+			entries.put("api-key-credentials", this.properties.getApiKeyCredentials());
+			entries.put("user-name", this.properties.getUserName());
+		});
+		MutuallyExclusiveConfigurationPropertiesException.throwIfMultipleNonNullValuesIn((entries) -> {
+			entries.put("api-key-credentials", this.properties.getApiKeyCredentials());
+			entries.put("password", this.properties.getPassword());
+		});
 		return new ElasticPropertiesConfigAdapter(this.properties);
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticProperties.java

@@ -60,14 +60,12 @@ public class ElasticProperties extends StepRegistryProperties {
 	private boolean autoCreateIndex = true;
 
 	/**
-	 * Login user of the Elastic server. If API key is configured, it will be used for
-	 * authentication instead of username/password.
+	 * Login user of the Elastic server. Mutually exclusive with api-key-credentials.
 	 */
 	private String userName;
 
 	/**
-	 * Login password of the Elastic server. If API key is configured, it will be used for
-	 * authentication instead of username/password.
+	 * Login password of the Elastic server. Mutually exclusive with api-key-credentials.
 	 */
 	private String password;
 
@@ -77,8 +75,7 @@ public class ElasticProperties extends StepRegistryProperties {
 	private String pipeline;
 
 	/**
-	 * Base64-encoded credentials string. If configured, it will be used for
-	 * authentication instead of username/password.
+	 * Base64-encoded credentials string. Mutually exclusive with user-name and password.
 	 */
 	private String apiKeyCredentials;
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfigurationTests.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.
@@ -22,6 +22,7 @@ import io.micrometer.elastic.ElasticMeterRegistry;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.context.properties.source.MutuallyExclusiveConfigurationPropertiesException;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -90,6 +91,24 @@ class ElasticMetricsExportAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void apiKeyCredentialsIsMutuallyExclusiveWithUserName() {
+		this.contextRunner.withUserConfiguration(BaseConfiguration.class)
+				.withPropertyValues("management.metrics.export.elastic.api-key-credentials:secret",
+						"management.metrics.export.elastic.user-name:alice")
+				.run((context) -> assertThat(context).hasFailed().getFailure().getRootCause()
+						.isInstanceOf(MutuallyExclusiveConfigurationPropertiesException.class));
+	}
+
+	@Test
+	void apiKeyCredentialsIsMutuallyExclusiveWithPassword() {
+		this.contextRunner.withUserConfiguration(BaseConfiguration.class)
+				.withPropertyValues("management.metrics.export.elastic.api-key-credentials:secret",
+						"management.metrics.export.elastic.password:secret")
+				.run((context) -> assertThat(context).hasFailed().getFailure().getRootCause()
+						.isInstanceOf(MutuallyExclusiveConfigurationPropertiesException.class));
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class BaseConfiguration {