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# frozen_string_literal: true
module JsonLdHelper
def equals_or_includes?(haystack, needle)
haystack.is_a?(Array) ? haystack.include?(needle) : haystack == needle
end
def first_of_value(value)
value.is_a?(Array) ? value.first : value
end
def value_or_id(value)
value.is_a?(String) ? value : value['id']
end
def supported_context?(json)
!json.nil? && equals_or_includes?(json['@context'], ActivityPub::TagManager::CONTEXT)
end
def canonicalize(json)
graph = RDF::Graph.new << JSON::LD::API.toRdf(json)
graph.dump(:normalize)
end
def fetch_resource(uri)
response = build_request(uri).perform
return if response.code != 200
body_to_json(response.to_s)
end
def body_to_json(body)
body.is_a?(String) ? Oj.load(body, mode: :strict) : body
rescue Oj::ParseError
nil
end
def merge_context(context, new_context)
if context.is_a?(Array)
context << new_context
else
[context, new_context]
end
end
private
def build_request(uri)
request = Request.new(:get, uri)
request.add_headers('Accept' => 'application/activity+json, application/ld+json')
request
end
end