$ref to a yaml schema fails to resolve

[danfelicetta-RL]

Given a schema in yaml, which references a sub-schema also in yaml, e.g.:

$id: resource:/schema
type: object
properties:
  foo:
    $ref: foo.yml

foo.yml

type: object

validate will fail because the resolution of the reference will attempt to parse foo.yml as if it were json:

Caused by: com.networknt.schema.JsonSchemaException: com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'type': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: (BufferedInputStream); line: 1, column: 6]
	at app//com.networknt.schema.JsonSchemaFactory.getSchema(JsonSchemaFactory.java:396)
	at app//com.networknt.schema.RefValidator.getRefSchema(RefValidator.java:79)
	at app//com.networknt.schema.RefValidator.<init>(RefValidator.java:42)

the same example with the sub-schema in json will work as expected:

$id: resource:/schema
type: object
properties:
  foo:
    $ref: foo.json

foo.json

{"type": "object"}

should retrieving a schema from a URI attempt to detect the format as yaml and parse it as such?

[stevehu]

@danfelicetta-RL Thanks for raising this issue. Yes. We can figure out the format of the subschema by the extension (.yml, .yaml and .json) and parse it correctly. Can you fix it?

[danfelicetta-RL]

@stevehu yep, i can work on a PR