I know you can try to read the ACLs or Bucket Policies through the Java SDK, but is there any easy way to just check if you have read and/or write permissions to a bucket and/or its contents? I don't see any "haveReadPermissions()" method or anything in the AmazonS3 class, but maybe I'm missing something? I find it hard to believe there's no easy way to check permissions.
5 Answers
Here how you can do this:
// get list of bucket permission
List<String> bucketPermissions = s3Client
.getBucketAcl(bucketName)
.getGrantsAsList().stream().distinct()
.map(t -> t.getPermission().toString())
.collect(Collectors.toList());
// check read/write or full control permission
if (
!((bucketPermissions.contains("READ")
&& bucketPermissions.contains("WRITE"))
|| (bucketPermissions.contains("FULL_CONTROL")))) {
throw new InsufficentBucketPermissionException();
}
Please feel free to improve this solution.
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