Invalid JSON-LD context

[zotanmew]

Heya, a.gup.pe is not generating a valid JSON-LD context. According to the specification, redefining keywords is not permitted.

If you fetch the outbox of any guppe group (or receive an activity from guppe), the context will look something like this:

  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "@context": {
        "PropertyValue": "http://schema.org/#PropertyValue"
      }
    }
  ]

The nested @context causes every JSON-LD compliant parser to throw an exception. Since I presume you simply wanted to add the term definition for PropertyValue, the context should look like this instead:

  "@context": [
    "https://www.w3.org/ns/activitystreams",
    "https://w3id.org/security/v1",
    {
      "PropertyValue": "http://schema.org/#PropertyValue"
    }
  ]

I don't know the details of the ActivitypubExpress library, as used here:

guppe/index.js

Line 54 in 7d44a6d

context: require('./data/context.json'),

But I presume the issue lies here:

guppe/data/context.json

Lines 1 to 5 in 7d44a6d

	{
	"@context": {
	"PropertyValue" : "http://schema.org/#PropertyValue"
	}
	}

[grishka]

This affects Smithereen as well, it can't load these actors because it actually does the whole JSON-LD transformation thing before processing any ActivityPub objects.