feat(worker): Presign S3 URLs for client access to private datasets #3645
+93
−29
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This switches to using presigned URLs for any files in OpenNeuro's S3 buckets. Anonymous requests are still used for any other S3 buckets. A client can now browse a private dataset with remote files that are not publicly accessible as long as the user has dataset read permissions on OpenNeuro.
Introduces a shared boto3 session which avoids reconfiguring boto3 frequently when signing large numbers of files.