forked from treehouse/mastodon
131 lines
4.0 KiB
Ruby
131 lines
4.0 KiB
Ruby
# frozen_string_literal: true
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module JsonLdHelper
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def equals_or_includes?(haystack, needle)
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haystack.is_a?(Array) ? haystack.include?(needle) : haystack == needle
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end
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def equals_or_includes_any?(haystack, needles)
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needles.any? { |needle| equals_or_includes?(haystack, needle) }
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end
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def first_of_value(value)
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value.is_a?(Array) ? value.first : value
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end
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# The url attribute can be a string, an array of strings, or an array of objects.
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# The objects could include a mimeType. Not-included mimeType means it's text/html.
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def url_to_href(value, preferred_type = nil)
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single_value = if value.is_a?(Array) && !value.first.is_a?(String)
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value.find { |link| preferred_type.nil? || ((link['mimeType'].presence || 'text/html') == preferred_type) }
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elsif value.is_a?(Array)
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value.first
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else
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value
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end
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if single_value.nil? || single_value.is_a?(String)
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single_value
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else
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single_value['href']
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end
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end
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def as_array(value)
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value.is_a?(Array) ? value : [value]
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end
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def value_or_id(value)
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value.is_a?(String) || value.nil? ? value : value['id']
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end
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def supported_context?(json)
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!json.nil? && equals_or_includes?(json['@context'], ActivityPub::TagManager::CONTEXT)
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end
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def unsupported_uri_scheme?(uri)
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!uri.start_with?('http://', 'https://')
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end
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def canonicalize(json)
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graph = RDF::Graph.new << JSON::LD::API.toRdf(json, documentLoader: method(:load_jsonld_context))
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graph.dump(:normalize)
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end
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def fetch_resource(uri, id, on_behalf_of = nil)
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unless id
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json = fetch_resource_without_id_validation(uri, on_behalf_of)
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return unless json
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uri = json['id']
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end
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json = fetch_resource_without_id_validation(uri, on_behalf_of)
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json.present? && json['id'] == uri ? json : nil
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end
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def fetch_resource_without_id_validation(uri, on_behalf_of = nil, raise_on_temporary_error = false)
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build_request(uri, on_behalf_of).perform do |response|
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unless response_successful?(response) || response_error_unsalvageable?(response) || !raise_on_temporary_error
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raise Mastodon::UnexpectedResponseError, response
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end
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return body_to_json(response.body_with_limit) if response.code == 200
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end
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# If request failed, retry without doing it on behalf of a user
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return if on_behalf_of.nil?
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build_request(uri).perform do |response|
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unless response_successful?(response) || response_error_unsalvageable?(response) || !raise_on_temporary_error
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raise Mastodon::UnexpectedResponseError, response
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end
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response.code == 200 ? body_to_json(response.body_with_limit) : nil
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end
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end
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def body_to_json(body, compare_id: nil)
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json = body.is_a?(String) ? Oj.load(body, mode: :strict) : body
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return if compare_id.present? && json['id'] != compare_id
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json
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rescue Oj::ParseError
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nil
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end
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def merge_context(context, new_context)
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if context.is_a?(Array)
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context << new_context
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else
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[context, new_context]
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end
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end
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private
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def response_successful?(response)
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(200...300).cover?(response.code)
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end
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def response_error_unsalvageable?(response)
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(400...500).cover?(response.code) && response.code != 429
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end
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def build_request(uri, on_behalf_of = nil)
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request = Request.new(:get, uri)
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request.on_behalf_of(on_behalf_of) if on_behalf_of
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request.add_headers('Accept' => 'application/activity+json, application/ld+json')
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request
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end
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def load_jsonld_context(url, _options = {}, &_block)
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json = Rails.cache.fetch("jsonld:context:#{url}", expires_in: 30.days, raw: true) do
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request = Request.new(:get, url)
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request.add_headers('Accept' => 'application/ld+json')
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request.perform do |res|
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raise JSON::LD::JsonLdError::LoadingDocumentFailed unless res.code == 200 && res.mime_type == 'application/ld+json'
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res.body_with_limit
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end
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end
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doc = JSON::LD::API::RemoteDocument.new(url, json)
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block_given? ? yield(doc) : doc
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end
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end
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