public Map<String, String> sign(String httpeMethod, String endpoint, String resourcePath,
			Map<String, String> headers, Map<String, String> params, InputStream entity,
			String accessKey, String secretKey) {

		Request<?> req = buildAWSRequest(httpeMethod, endpoint, resourcePath, headers, params, entity);
		sign(req, accessKey, secretKey);
		return req.getHeaders();
	}
public Map < String , String > sign ( String httpeMethod , String endpoint , String resourcePath , Map < String , String > headers , Map < String , String > params , InputStream entity , String accessKey , String secretKey ) { Request < ? > req = buildAWSRequest ( httpeMethod , endpoint , resourcePath , headers , params , entity ) ; sign ( req , accessKey , secretKey ) ; return req . getHeaders ( ) ; }
Signs a request using AWS signature V4.
@param httpeMethod GET/POST/PUT... etc.
@param endpoint the hostname of the API server
@param resourcePath the path of the resource (starting from root e.g. "/path/to/res")
@param headers the headers map
@param params the params map
@param entity the entity object or null
@param accessKey the app's access key
@param secretKey the app's secret key
@return a signed request. The actual signature is inside the {@code Authorization} header.