Unable to load the Slack OpenAPI definition

[hamzaed]

The bot is unable to load the definition of Slack API located at https://api.slack.com/specs/openapi/v2/slack_web.json

Reported by @UCW443

[hamzaed]

After some digging, I found out that the Slack definition use tuples (i.e., items taking as value an array of objects instead of an object).. However, the OpenAPI metamodel and the OpenAPI importer do not support tuple definitions

"items": [
	{"$ref": "#/definitions/objs_message"},
	{"type": "null"}
    ]

Other OpenAPI tools such as https://editor.swagger.io/ struggle with this as well.

[hamzaed]

Also, the definition define type as an array instead a String (to define alternative types for the instances).

"type": [
	"object",
	"null",
	"array"]

This is not supported yet by the metamodel.