Create new PURL services

[pombredanne]

I would like to have various small API services all keyed by PURL, either as new endpoints or extending existing endpoints, with backing ScanCode.io pipelines as needed:

• go2purl: Go package to Go PURL #259
• purl2git: From PURL get Git versions and tags  #258
• purl2dwarf: Get DWARFs from a PURL #260

[pombredanne]

Let's design a suite of rest API PURL-related endpoints that that are easy to understand:

• 1. we have things that take a PURL as an input and return data:
  • we have "validate": at "https:///api/validate/" use PURL as an input
  • DWARF and Git use PURL as an input. A symbols endpoint would use this in the future too.
• 2. we have things that take a some other data as an input and return PURLs:
  • Go use a Go import as an input and returns PURLs
  • we would need also something that exposes a url2purl taking a URL as input and returns PURLs
  • we could also have a GitHub, GitLab or other VCS URL input and return all the tags (e.g., we could return PURLs too)

• For 1. we should group these services under some "from_purl" header as they take a PURL as an input

  • from_purl/validate
  • from_purl/dwarf
  • from_purl/urls
  • from_purl/versions
  • from_purl/git

• For 2. we should group these services under some "to_purl" header as they return PURLs

  • to_purl/url
  • to_purl/go_import

[DennisClark]

@pombredanne @TG1999 I believe that this can be closed, since the 3 task issues are all done, with comments to describe how they can be tested.

[pombredanne]

See for completion details:

• go2purl: Go package to Go PURL #259 (comment)
• purl2git: From PURL get Git versions and tags  #258 (comment)
• purl2dwarf: Get DWARFs from a PURL #260 (comment)