Why: supporting JSON schema $refs is desired for the
CommunityConfiguration 2.0 project so configuration
schemas can reuse definitions coming from another
PHP JsonSchema class. The https://json-schema.org/
specification supports relative and absolute URIs
as the content of a $ref. The change aims
to support only the former. Meaning that any
$ref defined in a schema should point to a
class that can be resolved by PHP.
What: update schema traversing in JsonSchemaTrait
to resolve any reference specified as:
[ 'class' => SomeClass:class, 'field' => 'someClassField' ]
into an actual json schema compliant $ref, eg:
$ref: '#/$defs/SomeDefinitionName'. Also annotate
new definitions found in a "$defs" array with the
resolved value of the refed class field.
Bug: T357718
Change-Id: I130326e5762e706be4889e308eeec45a6c7683c5
