WIP: Fetching triples from a JSON-LD document

[angelo-v]

I added a failing test for a problem I observed fetching data from JSON-LD documents. The PR does not include a fix yet. Reviews, if the test actually uncovers a bug that needs fixing are welcome. The same is true for ideas how to fix.

[josephguillaume]

There's a small typo here:

Suggested change

	"@id": ${uri},
	"@id": "${uri}",

I haven't run the test, but if it passes now, then maybe the issue you were facing was #408?
Note also that another bug caused jsonld errors to be suppressed: #435

I've added some annotations to the relevant commit 16daad7#r41313390

[josephguillaume]

Or is there a separate issue related to fetching, like in #343?

[angelo-v]

Good catch! Fixed the syntax. But test is still failing for the same reason. I think the issue is in the fetching / response handling.

There is just no default handler for JSON-LD?

const defaultHandlers = {
  RDFXMLHandler, XHTMLHandler, XMLHandler, HTMLHandler, TextHandler, N3Handler
}

[michielbdejong]

This also makes NSS fail the content negotiation tests I'm adding in solid-contrib/solid-crud-tests@9d4928b

[michielbdejong]

I'll see what I can do to try to fix this bug.

[michielbdejong]

Indeed it cannot find a JSON-LD handler, these are my debug statements from handlerForContentType:

handle response application/ld+json
checking pattern /application\/rdf\+xml/ null
checking pattern /application\/xhtml/ null
checking pattern /(text|application)\/(.*)xml/ null
checking pattern /text\/html/ null
checking pattern /text\/plain/ null
checking pattern /(application|text)\/(x-)?(rdf\+)?(n3|turtle)/ null
no handler

[michielbdejong]

Continued in #439