SharePoint Base64 decoding error in OpenCMIS

[Jonathan Lee <jo...@gmail.com>]

Hi all

Currently we are trying to use openCMIS 0.3.0 to mount a SharePoint 2010
Repository. We have run into an issue when trying to get the content stream
of the documents. SharePoint 2010 return the stream with Base64 encoding,
and I am aware that
org.apache.chemistry.opencmis.client.bindings.spi.atompub.HttpUtils returns
a Base64.InputStream if the content encoding type is base64. However there
is an error when Base64 is trying to decode the stream. Here is the
exception,

java.lang.ArrayIndexOutOfBoundsException: -19
at
org.apache.chemistry.opencmis.commons.impl.Base64.decode4to3(Base64.java:1048)
at
org.apache.chemistry.opencmis.commons.impl.Base64.access$200(Base64.java:33)
at
org.apache.chemistry.opencmis.commons.impl.Base64$InputStream.read(Base64.java:1766)
at
org.apache.chemistry.opencmis.commons.impl.Base64$InputStream.read(Base64.java:1832)
at java.io.FilterInputStream.read(Unknown Source)

After some debugging I realized the InputStream being decoded is not the
correct stream.

So instead of using the InputStream I get from calling,

*docuemnt.getcontentStream().getStream()*


I did my own Http Get Request

http://
[Server]/_vti_bin/cmis/rest/81c77da7-2ecd-436a-aadd-3cb01b74d55b?getContentStream&objectID=48-512

and called this to get the InputStream

inputStream = new Base64.InputStream(connection.getInputStream());

When I pass the inputStream I acquired through my own method to Base64, The
decoding works!

I am wondering if document.getContentStream().getStream() is returning the
correct stream when retrieving from SharePoint. Can anyone share some
insight on this problem?

Here are some extra information that I think you might want to know.

This is the respond header when we call
http://[Server]/_vti_bin/cmis/rest/81c77da7-2ecd-436a-aadd-3cb01b74d55b?getContentStream&objectID=48-512
This

Cache-ControlprivateContent-Typetext/plain; charset=utf-8Content-Encoding
gzipVaryAccept-EncodingServerMicrosoft-IIS/7.0SPRequestGuid
a8bcfa3a-fced-4149-8553-38f40ebad01dSet-CookieWSS_KeepSessionAuthenticated={774a893e-3944-489d-84b1-b861ed338a6f};
path=/X-SharePointHealthScore5Content-Transfer-Encodingbase64
X-AspNet-Version2.0.50727X-Powered-ByASP.NETMicrosoftSharePointTeamSe...
14.0.0.4762DateThu, 28 Apr 2011 18:28:55 GMTContent-Length1546

This is the response body, which is Base64 encoded

VGhpcyBpcyBhIFRlc3RpbmcgRG9jdW1lbnQNCg0KVGVzdGluZyBPcGVuQ01JUw0KDQpTaGFyZVBvaW50IDIwMTANCg0KSm9uYXRoYW4gTGVl

Any help or insight would be much appreciated!

Thanks

Jonathan Lee