Implement Unpublished Immutable Data

[lionel-faber]

• Add structure for Unpublished Immutable data
• Implement name function that derives data address using the hash of the data and the owner.
• GET requests must be signed. Only the owner should be able to fetch the data from the network.

Questions:

• Will this require changes/additions in self_encryption?

Note:

• The data type must move into the new data types crate
• All RPCs are between clients and vaults
• Routing will include only a send(src, dest, payload) API
• Ownership of the data is non-transferrable

[nbaksalyar]

To answer one of the questions:

Will this require changes/additions in self_encryption?

No, since self_encryption is agnostic to data types.

It might require some changes in SCL code interfacing with self_encryption, as e.g.: https://github.com/maidsafe/safe_client_libs/blob/11ab01de08ef8ea82852bbb19f06e54b2fa88106/safe_core/src/immutable_data.rs