Migrate Catalog Browser to API Wrapper

[SebastianOpriel]

Feature

Description

Right now the catalog browser does multiple requests in the UI and cannot properly include further information for contract offers such as existing negotiations or existing contract agreements

Possible Solution

• In general, this is on hold until our broker server / broker client have been implemented further so we can judge how the broker and the new catalog browser will interact.

MVP

• Create API Wrapper Endpoint (MVP endpoint, only include asset for each contract offer)
  • Accepts a list of additional Connector Endpoints
  • Has a flag to skip preconfigured Connector Endpoints
  • Requests Connector Endpoints in parallel
  • Returns a status for the entire request, in case all requests failed.
  • Returns a list of request status results, e.g. for each url if it succeeded, and if it didn't, a comprehensible user error message
  • Returns a merged list of contract offer dtos.
  • Accept search parameters, search should happen on the backend side.
• Migrate the UI to use the new endpoint. This should allow us to remove existing logic about merging results / merging status results

Potential Improvements (to be implemented later)

• Data Offers in Catalog should show existing Contracts #211
• Existing Contract Agreement details
• Transfer History for each contract offer

[richardtreier]

replaced by #403