S3: GetObjectRequest toFile option to override file

[mina-asham]

Migrating from SDK V1 to V2 we hit an issue where do something like this (pseudo-code):

Path temp = Files.createTempFile(...);
s3.getObject(bucket, key, temp);
// use temp file

This allows us to download a temp file, validate it and if we are happy flip it to the actual path overriding the existing previous file.

This works on V1 because: because it just opens an outputstream which by default overwrites (here) but doesn't work on V2 because we are not passing any options to Files.copy (here)

Describe the Feature

Allow the use of S3 client to download an object to an existing file by overwriting it

Is your Feature Request related to a problem?

See general summary

Proposed Solution

• Suggestion 1 (preferred): adding an overload with a boolean overwrite for this toFile method here that can be passed to the Files.copy call as StandardCopyOption.REPLACE_EXISTING (only option allowed when using Files.copy with an input stream)
• Suggestion 2 (less preferred because it's ugly but works): Add another method in ResponseTransformer, e.g. ResponseTransformer.toFileOverwrite
• Suggestion 3 (not preferred because it's a breaking change): Change the default behaviour and hardcode StandardCopyOption.REPLACE_EXISTING

Describe alternatives you've considered

See suggestion 2/3 in proposed solution

Additional Context

• [x] I may be able to implement this feature request

Your Environment

• AWS Java SDK version used: N/A
• JDK version used: N/A
• Operating System and version: N/A