GH-75: add EnvPP for CS-AWS exclusion

Fixes https://github.com/spring-cloud/stream-applications/issues/75

functions/common/aws-s3-common/src/main/java/org/springframework/cloud/fn/common/aws/s3/AutoConfigurationExclusionEnvironmentPostProcessor.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2020-2020 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
+ *
+ *      https://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.cloud.fn.common.aws.s3;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.env.EnvironmentPostProcessor;
+import org.springframework.cloud.aws.autoconfigure.context.ContextResourceLoaderAutoConfiguration;
+import org.springframework.core.annotation.Order;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.env.StandardEnvironment;
+
+/**
+ * @author Timo Salm
+ */
+@Order
+public class AutoConfigurationExclusionEnvironmentPostProcessor implements EnvironmentPostProcessor {
+
+	static final String SPRING_AUTOCONFIGURE_EXCLUDE_PROPERTY = "spring.autoconfigure.exclude";
+
+	@Override
+	public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
+		final PropertySource<?> propertySource = environment.getPropertySources()
+				.get(StandardEnvironment.SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME);
+		if (propertySource instanceof MapPropertySource) {
+			((MapPropertySource) propertySource).getSource().put(SPRING_AUTOCONFIGURE_EXCLUDE_PROPERTY,
+					ContextResourceLoaderAutoConfiguration.class.getCanonicalName());
+		}
+	}
+}

functions/common/aws-s3-common/src/main/resources/META-INF/spring.factories

@@ -1,3 +1,5 @@
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
   org.springframework.cloud.fn.common.aws.s3.CompatibleStorageAmazonS3Configuration,\
   org.springframework.cloud.fn.common.aws.s3.AmazonS3Configuration
+org.springframework.boot.env.EnvironmentPostProcessor=\
+  org.springframework.cloud.fn.common.aws.s3.AutoConfigurationExclusionEnvironmentPostProcessor

functions/common/aws-s3-common/src/main/resources/application.properties

@@ -1 +0,0 @@
-spring.autoconfigure.exclude=org.springframework.cloud.aws.autoconfigure.context.ContextResourceLoaderAutoConfiguration

functions/common/aws-s3-common/src/test/java/org/springframework/cloud/fn/common/aws/s3/AutoConfigurationExclusionEnvironmentPostProcessorTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2020-2020 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
+ *
+ *      https://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.cloud.fn.common.aws.s3;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.env.ConfigurableEnvironment;
+
+import static org.springframework.cloud.fn.common.aws.s3.AutoConfigurationExclusionEnvironmentPostProcessor
+		.SPRING_AUTOCONFIGURE_EXCLUDE_PROPERTY;
+
+/**
+ * @author Timo Salm
+ */
+class AutoConfigurationExclusionEnvironmentPostProcessorTests {
+
+	@Test
+	public void addsConfigurationPropertyToExcludeAmazonS3AutoConfiguration() {
+		final ConfigurableApplicationContext context = new SpringApplicationBuilder()
+				.sources(AutoConfigurationExclusionEnvironmentPostProcessor.class)
+				.web(WebApplicationType.NONE)
+				.build()
+				.run();
+
+		final ConfigurableEnvironment environment = context.getEnvironment();
+		Assertions.assertEquals(
+				"org.springframework.cloud.aws.autoconfigure.context.ContextResourceLoaderAutoConfiguration",
+				environment.getProperty(SPRING_AUTOCONFIGURE_EXCLUDE_PROPERTY));
+	}
+}