Internal server error when definition in extension cannot be dereferenced

[duncandewhurst]

Example

The issue is that there is a typo in the extension's release-schema.json which means a definition cannot be dereferenced.

Can this information be passed back to the user in the form of an error message? e.g.

Could not dereference #/definitions/AddressDetails in Address Details extension

[duncandewhurst]

Investigate CoVE errors in Kingfisher Process Sentry

[ghost]

Internal server error when definition in extension cannot be dereferenced

[robredpath]

eOCDS-Extensions/eOCDS-addressDetails@7499eb4 is the commit where the typo gets fixed

[rhiaro]

Possible/intermittent crash when definition in extension cannot be dereferenced

[jpmckinney]

Can reproduce:

{
  "version": "1.1",
  "extensions": [
    "https://gist.githubusercontent.com/jpmckinney/7376110b73c6313507d50a628f2e6f88/raw/9ef2b515c7f8915477e88128d4a38755cabb48c1/extension.json"
  ],
  "publishedDate": "2000-01-01T00:00:00Z",
  "publisher": {
    "name": "Acme Inc."
  },
  "uri": "https://example.com",
  "releases": [
    {
      "ocid": "ocds-1234567",
      "id": "ocds-1234567-1",
      "date": "2000-01-01T00:00:00Z",
      "tag": ["tender"],
      "initiationType": "tender",
      "unresolvable": "1"
    }
  ]
}

RefResolutionError: Unresolvable JSON pointer: 'definitions/Unresolvable'

The error is raised at different points, depending on whether the "unresolvable" field is included. If it is included, it's raised by jsonschema:

Internal Server Error
Something went wrong with your request. This could be due to a bug in the application and/or the data you supplied.

If it's not, it's raised by deref_schema, which catches jsonref.JsonRefError and sets json_deref_error (noting that this can make some logic errors hard to discover, since deref_schema can be called indirectly):

JSON reference error
We have detected a JSON reference error in the schema. This may be due to some extension trying to resolve non-existing references.
Error message: Unresolvable JSON pointer: '/definitions/Unresolvable'