TRUNK-6318: Add S3 storage service structure

api/src/main/java/org/openmrs/api/storage/S3StorageService.java

@@ -0,0 +1,61 @@
+package org.openmrs.api.storage;
+
+import org.openmrs.api.StorageService;
+import org.openmrs.api.stream.StreamDataService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.Conditional;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.stream.Stream;
+
+@Service
+@Conditional(StorageServiceCondition.class)
+@Qualifier("s3Storage")
+public class S3StorageService  extends BaseStorageService implements StorageService {
+
+	//TODO : Implement S3 storage service , S3 bucket configuration should be from application.properties / data source.
+
+	public S3StorageService(@Autowired StreamDataService streamService) {
+		super(streamService);
+		//TODO : Implement S3 storage service
+	}
+
+	@Override
+	public InputStream getData(String key) throws IOException {
+		//TODO : get file from give key path and Convert file into input stream
+		return null;
+	}
+
+	@Override
+	public ObjectMetadata getMetadata(String key) throws IOException {
+		//TODO : get file metadata from given key path
+		return null;
+	}
+
+	@Override
+	public Stream<String> getKeys(String moduleIdOrGroup, String keyPrefix) throws IOException {
+		//TODO : get all keys from give moduleIdOrGroup and keyPrefix also don't include hidden file.
+		return Stream.empty();
+	}
+
+	@Override
+	public String saveData(InputStream inputStream, ObjectMetadata metadata, String moduleIdOrGroup, String keySuffix) throws IOException {
+		//TODO : save file to S3 bucket and return the key
+		return "";
+	}
+
+	@Override
+	public boolean purgeData(String key) throws IOException {
+		//TODO : delete file from S3 bucket
+		return false;
+	}
+
+	@Override
+	public boolean exists(String key) {
+		//TODO : check if file exists in S3 bucket
+		return false;
+	}
+}