[Feature] Create NautilusDDO wrapper class

[moritzkirstein]

Motivation / Problem

We want to enable editing from within Nautilus.

10

Solution

We need to further split up logic in publish to easily enable edit functionality. For this we should create a NautilusDDO class providing a wrapper for the ocean.js DDO.

This should add additional functionality to the DDO:

• [x] move metadata from NautilusAsset to NautilusDDO
• [x] move services from NautilusAsset to NautilusDDO
• [x] construct ocean.js ddo using NautilusDDO on publish:
  • helper function, e.g. getDDO(), which returns NautilusDDO.ddo
  • helper function to construct the ddo using metadata & services, e.g. buildDDO. ddo can contain an already published DDO, in that case the configs in metadata and services will overwrite previous data
  • getDDO returns
  • buildDDO() if metadata | services != undefined
  • ddo else

classDiagram
    AssetBuilder *-- NautilusAsset
    NautilusAsset *-- NautilusDDO
    class NautilusDDO{
        -ServiceConfig services
        -MetadataConfig metadata
        -DDO ddo
        -buildDDO()
        +getDDO() DDO
    }