update getPodRoot() to v.10 solid protocol

[bourgeoa]

getPodRoot() is meant to find a storageRoot.
It actually get the information from the WebID and expect to return one or none among the storage listed in the profile.
This must be updated to :

• profile having 0, 1 or more storages
• when > 1 return as storage the profile storage if available
• when no storage use the new v.10 protocol header link --> solid:storageDescription
  if not available make a recursive research to solid:Storage in the root of storage

[bourgeoa]

nodeSolidServer/node-solid-server#1730

[SharonStrats]

See https://github.com/SolidOS/solid-ui/blob/3576458f7be53012dc4085b5ae7caee1a511773e/src/utils/keyHelpers/accessData.ts#L7 for reference.

@bourgeoa I want to ask you about the 3rd point of protocol header link when no storages found? Can you point me to more details on this for my understanding?

[bourgeoa]

Root storage container description MUST include this triple

Servers MUST include statements about the storage as part of the storage description resource.
Storage description statements include the properties:
rdf:type
A class whose URI is http://www.w3.org/ns/pim/space#Storage

NSS does this by having the above triple in podRoot/.meta

[jeff-zucker]

What does this mean?

when > 1 return as storage the profile storage if available

Does it mean if there are 3 storages listed in the profile and one of them is on the same subdomain as the profile, that is the storage to use?

[bourgeoa]

That is a proposal. Happy that there is a reaction.
Actually the function returns one storage using with match any. The result is not reproducible. Depending on what you want to do it may be an issue.