CalcDigest calculates the digest of the object using the specified algorithm (md5 or sha256), using ranged downloads of the specified size.

DisallowIAMFallback uses reflection to check whether we're falling back to IAM credentials See https://github.com/aws/aws-sdk-go/issues/2392.

Download downloads the object in chunks of the specified rangeSize, writing the downloaded bytes to the specified io.Writer.

InitS3Session returns a new AWS session configured for S3 access via the specified endpoint and region.

IsEC2 returns true if the current system appears to be an EC2 host, false otherwise.

RegionFromEndpoint attempts to extract an AWS region from the specified endpoint URL, returning an error if none can be found.

DefaultAwsRegion represents the default AWS region for accessing AWS objects.

Target encapsulates a service URL and a bucket or container.