How to generate document location url for previous verions using OpenCMIS

longinus

Hello All,

I want to generate a url for a previous version of a document using OpenCMIS library and Alfresco 5.

My understanding is that previous version is to be obtained from version store:

{serverhost:port/regionalContext}/d/d/versionStore/version2Store/{nodeId}/{fileName}

but OpenCMIS doesnt give me back the nodeId in version store. Instead i get id of the main document while calling getAllVersions(), which doesnt help me.

Is there any way around it?

Regards,

Krzysztof

jpotts

Hi Krzysztof,

Suppose I create a document, sample-a.pdf, in Alfresco, and I version it twice by uploading new versions of the file, sample-b.pdf, and sample-c.pdf. I will end up with a version tree that looks like this:

sample-c.pdf 3.0 (Current)

sample-b.pdf 2.0

sample-a.pdf 1.0

Everything you need to be able to construct a download URL for each of those three versions is available from CMIS. To prove that, I'll launch Apache Chemistry OpenCMIS Workbench and connect to my Alfresco 5.2 repository using this service URL:

http://localhost:8080/alfresco/api/-default-/public/cmis/versions/1.1/browser 

The key piece of info that you may be missing is that there is a special property called alfcmis:nodeRef that contains the Alfresco node reference. That's critical for being able to reconstruct an Alfresco download URL.

The CMIS object ID, CMIS download URL, alfcmis:nodeRef, cmis:name, and Alfresco Download URLs for each of the major versions is shown below:

Version 1.0

CMIS Object ID: 716668a8-9b95-427d-9818-7adebf31cee5%3B1.0
CMIS Download URL: http://localhost:8080/alfresco/api/-default-/public/cmis/versions/1.1/browser/root?objectId=716668a8-9b95-427d-9818-7adebf31cee5%3B1.0&cmisselector=content

alfcmis:nodeRef: versionStore://version2Store/524adbd3-d381-41f4-b7c6-2c0ab632774f
cmis:name: sample-a.pdf
Alfresco Download URL (Share): http://localhost:8080/share/proxy/alfresco/api/node/content/versionStore/version2Store/524adbd3-d381-41f4-b7c6-2c0ab632774f/sample-a.pdf
Alfresco Download URL (Alfresco): http://localhost:8080/alfresco/s/api/node/content/versionStore/version2Store/524adbd3-d381-41f4-b7c6-2c0ab632774f/sample-a.pdf

Version 2.0

CMIS Object ID: 716668a8-9b95-427d-9818-7adebf31cee5%3B2.0
CMIS Download URL: http://localhost:8080/alfresco/api/-default-/public/cmis/versions/1.1/browser/root?objectId=716668a8-9b95-427d-9818-7adebf31cee5%3B2.0&cmisselector=content

alfcmis:nodeRef versionStore://version2Store/e39b9279-a2f6-4cb7-902c-e94d7efd4362
cmis:name: sample-b.pdf
Alfresco Download URL (Share): http://localhost:8080/share/proxy/alfresco/api/node/content/versionStore/version2Store/e39b9279-a2f6-4cb7-902c-e94d7efd4362/sample-b.pdf

Alfresco Download URL (Alfresco): http://localhost:8080/alfresco/s/api/node/content/versionStore/version2Store/e39b9279-a2f6-4cb7-902c-e94d7efd4362/sample-b.pdf

Version 3.0 (Current)

CMIS Object ID: 716668a8-9b95-427d-9818-7adebf31cee5%3B3.0
CMIS Download URL: http://localhost:8080/alfresco/api/-default-/public/cmis/versions/1.1/browser/root?objectId=716668a8-9b95-427d-9818-7adebf31cee5%3B3.0&cmisselector=content

alfcmis:nodeRef: workspace://SpacesStore/716668a8-9b95-427d-9818-7adebf31cee5
cmis:name: sample-c.pdf
Alfresco Download URL (Share): http://localhost:8080/share/proxy/alfresco/api/node/content/workspace/SpacesStore/716668a8-9b95-427d-9818-7adebf31cee5/sample-c.pdf

Alfresco Download URL (Alfresco): http://localhost:8080/alfresco/s/api/node/content/workspace/SpacesStore/716668a8-9b95-427d-9818-7adebf31cee5/sample-c.pdf

There are a few different URLs in Alfresco that can be used to download, but they all use the node reference.