Add AWS to cloud platforms

This commit adds support for detecting AWS to `CloudPlatform`. The
detection is based on presence of `AWS_DEFAULT_REGION` and
`AWS_EXECUTION_ENV` environment variables.

Signed-off-by: Vedran Pavic <vedran@vedranpavic.com>

Author: vpavic

core/spring-boot/src/main/java/org/springframework/boot/cloud/CloudPlatform.java

@@ -164,6 +164,21 @@ public boolean isDetected(Environment environment) {
 			return this.azureEnvVariables.stream().allMatch(environment::containsProperty);
 		}
 
+	},
+
+	/**
+	 * Amazon Web Services (AWS) platform.
+	 * @since 4.0.0
+	 */
+	AWS {
+
+		private final List<String> awsEnvVariables = Arrays.asList("AWS_DEFAULT_REGION", "AWS_EXECUTION_ENV");
+
+		@Override
+		public boolean isDetected(Environment environment) {
+			return this.awsEnvVariables.stream().allMatch(environment::containsProperty);
+		}
+
 	};
 
 	private static final String PROPERTY_NAME = "spring.main.cloud-platform";

core/spring-boot/src/test/java/org/springframework/boot/cloud/CloudPlatformTests.java

@@ -22,6 +22,8 @@
 import java.util.stream.Stream;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
 import org.springframework.boot.context.properties.bind.Binder;
 import org.springframework.boot.context.properties.source.MockConfigurationPropertySource;
@@ -205,6 +207,28 @@ void getActiveWhenHasMissingWebsiteSkuShouldNotReturnAzureAppService() {
 		assertThat(platform).isNull();
 	}
 
+	@Test
+	void getActiveWhenHasAllAwsEnvVariablesShouldReturnAws() {
+		Map<String, Object> envVars = new HashMap<>();
+		envVars.put("AWS_DEFAULT_REGION", "eu-west-1");
+		envVars.put("AWS_EXECUTION_ENV", "AWS_ECS_FARGATE");
+		Environment environment = getEnvironmentWithEnvVariables(envVars);
+		CloudPlatform platform = CloudPlatform.getActive(environment);
+		assertThat(platform).isNotNull().isEqualTo(CloudPlatform.AWS);
+		assertThat(platform.isActive(environment)).isTrue();
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "AWS_DEFAULT_REGION", "AWS_EXECUTION_ENV" })
+	void getActiveWhenHasMissingAwsVariableShouldNotReturnAws(String missingEnvVar) {
+		Map<String, Object> envVars = new HashMap<>();
+		envVars.compute("AWS_DEFAULT_REGION", (k, v) -> k.equals(missingEnvVar) ? null : "eu-west-1");
+		envVars.compute("AWS_EXECUTION_ENV", (k, v) -> k.equals(missingEnvVar) ? null : "AWS_ECS_FARGATE");
+		Environment environment = getEnvironmentWithEnvVariables(envVars);
+		CloudPlatform platform = CloudPlatform.getActive(environment);
+		assertThat(platform).isNull();
+	}
+
 	@Test
 	void getActiveWhenHasEnforcedCloudPlatform() {
 		Environment environment = getEnvironmentWithEnvVariables(