SSMEnvironmentPostProcessor.java

import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MapPropertySource;

import java.util.HashMap;
import java.util.Map;

/**
 * This class loads SSM parameters base on region and environment
 * Needs to be added to spring.factories class so that it will be invoked. as follow:
 * org.springframework.boot.env.EnvironmentPostProcessor=<full package>.SSMEnvironmentPostProcessor
 * Add the SSM propeties to other properties already set
 */

public class SSMEnvironmentPostProcessor implements EnvironmentPostProcessor {
    private static final String QUOTE = "\"";

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        SSMClient ssmClient = new SSMClient(DefaultAWSCredentialsProviderChain.getInstance(), System.getProperty("env" +
                ".region"), new ClientConfiguration());
        ssmClient.init();
        Map<String, Object> parameters = new HashMap<>();
        ssmClient.getParametersByPath("/" + System.getProperty("env"), true).entrySet().stream()
                .forEach(entry -> parameters.put(entry.getKey(), entry.getValue()));

        MapPropertySource mapPropertySource = new MapPropertySource("ssm", parameters);
        environment.getPropertySources().addLast(mapPropertySource);
    }

   
}