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From "Florent Guillaume (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CMIS-461) AtomPub: cannot get folder rendition by stream id
Date Thu, 27 Oct 2011 18:22:32 GMT
AtomPub: cannot get folder rendition by stream id
-------------------------------------------------

                 Key: CMIS-461
                 URL: https://issues.apache.org/jira/browse/CMIS-461
             Project: Chemistry
          Issue Type: Bug
          Components: opencmis-client-bindings
    Affects Versions: OpenCMIS 0.5.0
            Reporter: Florent Guillaume
            Assignee: Florent Guillaume
            Priority: Minor
             Fix For: OpenCMIS 0.6.0


Using AtomPub, the spec says that the URL for a rendition stream is in the {{<link rel="alternate"
href="...">}}, however these alternate link definitions don't contain the stream id. So
if all you have is a stream id (as returned in the {{<cmis:rendition>}} elements for
instance), it's not enough.

So using AtomPub it's impossible to implement properly a {{getContentStream}} with a {{streamId}}
parameter. That's a spec deficiency, as already pointed out in http://lists.oasis-open.org/archives/cmis/201002/msg00021.html

In the current implementation, an attempt is made to add {{?streamId=...}} to the content
stream URL, and apparently most servers accept that, even though this is not per spec. But
a folder (which may have a rendition) does not have a content stream so this cannot work at
all in the folder case.


One possibility to fix this is to try to extract a meaningful stream id from the alternate
links by parsing the link URL and extracting any {{streamId=...}} parameter found. Note that
this is only a workaround, as nothing in the spec mandates that the URL be of this form.


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