> +
> +import static com.google.common.io.BaseEncoding.base16;
> +
> +/**
> + * Converts ETag header values to byte arrays.
> + *
> + * @author Francis Devereux
> + */
> +public class ETagUtils {
> + public static byte[] convertETagToHash(String eTag) {
> + eTag = unquote(eTag);
> + return base16().lowerCase().decode(eTag);
> + }
> +
> + private static String unquote(String eTag) {
> + if (eTag.startsWith("\"") && eTag.endsWith("\"")) {
One thing to consider is weak etags. No self respecting blob store should
return a weak etag; but if it does I suspect the /graceful/ production behavior
here is to skip the leading /W of the header and continue as if it were a
strong etag.
In a /live/ test it may be useful to check new implementations (possibly a
poor-persons blob store backed by tomcat) actually return a weak etag and fail
the test until someone figures out why that blob store does not respect itself.
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