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https://issues.apache.org/jira/browse/JCLOUDS-1268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15980246#comment-15980246
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Andrew Gaul commented on JCLOUDS-1268:
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>From a high-level you understand the task at hand, although we need to figure
>out _how_ to modify the Payload. {{PayloadEnclosingImpl.setPayload}} closes
>the previous payload, so we cannot simply concatenate them. We also want to
>allow streaming, so we can't buffer all this in-memory.
> Calculate and include SHA-1 hash at the end of a B2 upload
> -----------------------------------------------------------
>
> Key: JCLOUDS-1268
> URL: https://issues.apache.org/jira/browse/JCLOUDS-1268
> Project: jclouds
> Issue Type: Improvement
> Components: jclouds-blobstore
> Affects Versions: 2.0.1
> Reporter: Andrew Gaul
> Priority: Minor
> Labels: b2
>
> B2 removed the need to calculate the SHA-1 hash before uploading a file,
> allowing streaming. Currently jclouds uploads files without a hash, although
> B2 also supports calculating the hash while uploading then including the
> SHA-1 at the end via {{X-Bz-Content-Sha1: hex_digits_at_end}}:
> https://www.backblaze.com/b2/docs/uploading.html
> Supporting this requires some changes to jclouds to allow modifying the
> Payload to emit the hash at the end of the transfer.
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