Access to Memory (AtoM)

AtoM needs to be updated to save the file relative path correctly

One thing to consider is that currently the "Download File" link verifies that a QubitAip instance exists. This is the case only in the regular DIP upload workflow, but not when the metadata-only DIP upload creates the digital objects through the API.

The AM Storage Service API extract_file endpoint requires both the AIP UUID and the AIP filename (Search for 'extract_file'):
https://wiki.archivematica.org/Storage_Service_API

For regular DIP Upload this information comes from the QubitAIP record:
https://github.com/artefactual/atom/blob/2cc4187c0c66980a99f0fc37180c3c616cb79196/plugins/arStorageServicePlugin/modules/arStorageService/actions/extractFileAction.class.php#L104-L105

For metadata-only DIP upload, this QubitAip record is not available.
- Can the storage service extract_file endpoint be modified so that it only requires the file UUID to find and extract the file from the correct AIP? Or require only the file and AIP UUIDs (minus the AIP file name)?
- Is this data stored elsewhere in AtoM that it could be looked up? (AIP UUID seems to be, but AIP file name does not)

If not we will need to modify AtoM's API and the agentarchives/atom/client.py to pass this info in and store it with the digital object (perhaps as a property like with the UUID). In the AtoM file extractFileAction.class.php these properties could be used if the QubitAip is not available.

It looks like the AIPUUID is already being passed to AtoM and stored as a property attached to the digital object record:
https://github.com/artefactual-labs/agentarchives/blob/2e316f502d94c1ef09f3954a5e4b1450ee445f35/agentarchives/atom/client.py#L635
https://github.com/artefactual/atom/blob/d1b32f079bf4bf4421f4f9ec8af2ec74f6a0f0d6/plugins/arRestApiPlugin/modules/api/actions/digitalobjectsCreateAction.class.php#L53

...but the AIP file name (required by the AMSS) does not seem to be.

PR for AtoM change:
https://github.com/artefactual/atom/pull/1237

Merged to qa/2.x