Case insensitive file search from s3 bucket - spring-boot

Question

I am using the Spring Boot SDK for aws and I want to check my s3 bucket to check if a file exists or not, ignoring the case of the filename. Right now I am searching if the file exits by:
s3client.doesObjectExist(bucketname,objectname)
objectname is the file key for s3 with complete filename at the end. So, what I want to do is: if the file path is a/b/c/d/car.pdf, the above method should return "true," even though the actual file path in s3 is: a/b/c/d/CAR.pdf, a/b/c/d/caR.pdf or a/b/c/D/car.pdf.

Answer 1

ObjectListing listObjects(String bucketName) throws SdkClientException, AmazonServiceException
Returns a list of summary information about the objects in the
specified buckets. List results are always returned in lexicographic
(alphabetical) order.
Because buckets can contain a virtually unlimited number of keys, the
complete results of a list query can be extremely large. To manage
large result sets, Amazon S3 uses pagination to split them into
multiple responses. Always check the ObjectListing.isTruncated()
method to see if the returned listing is complete or if additional
calls are needed to get more results. Alternatively, use the
AmazonS3Client.listNextBatchOfObjects(ObjectListing) method as an easy
way to get the next page of object listings.
The total number of keys in a bucket doesn't substantially affect list
performance.
So, you can do something like this:
ObjectListing objectListing = s3client.listObjects("MyBucketName");
for (S3ObjectSummary objectSummary : objectListing.getObjectSummaries()) {
// implement some search algorithm to find matching files using objectSummary.getKey()
}