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63 lines
2.1 KiB
Ruby
63 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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class ActivityPub::FetchRemoteKeyService < BaseService
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include JsonLdHelper
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class Error < StandardError; end
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# Returns actor that owns the key
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def call(uri, suppress_errors: true)
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raise Error, 'No key URI given' if uri.blank?
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@json = fetch_resource(uri, false)
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raise Error, "Unable to fetch key JSON at #{uri}" if @json.nil?
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raise Error, "Unsupported JSON-LD context for document #{uri}" unless supported_context?(@json)
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raise Error, "Unexpected object type for key #{uri}" unless expected_type?
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return find_actor(@json['id'], @json, suppress_errors) if actor_type?
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@owner = fetch_resource(owner_uri, true)
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raise Error, "Unable to fetch actor JSON #{owner_uri}" if @owner.nil?
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raise Error, "Unsupported JSON-LD context for document #{owner_uri}" unless supported_context?(@owner)
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raise Error, "Unexpected object type for actor #{owner_uri} (expected any of: #{SUPPORTED_TYPES})" unless expected_owner_type?
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raise Error, "publicKey id for #{owner_uri} does not correspond to #{@json['id']}" unless confirmed_owner?
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find_actor(owner_uri, @owner, suppress_errors)
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rescue Error => e
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Rails.logger.debug { "Fetching key #{uri} failed: #{e.message}" }
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raise unless suppress_errors
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end
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private
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def find_actor(uri, prefetched_body, suppress_errors)
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actor = ActivityPub::TagManager.instance.uri_to_actor(uri)
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actor ||= ActivityPub::FetchRemoteActorService.new.call(uri, prefetched_body: prefetched_body, suppress_errors: suppress_errors)
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actor
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end
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def expected_type?
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actor_type? || public_key?
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end
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def actor_type?
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equals_or_includes_any?(@json['type'], ActivityPub::FetchRemoteActorService::SUPPORTED_TYPES)
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end
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def public_key?
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@json['publicKeyPem'].present? && @json['owner'].present?
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end
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def owner_uri
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@owner_uri ||= value_or_id(@json['owner'])
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end
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def expected_owner_type?
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equals_or_includes_any?(@owner['type'], ActivityPub::FetchRemoteActorService::SUPPORTED_TYPES)
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end
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def confirmed_owner?
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value_or_id(@owner['publicKey']) == @json['id']
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end
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end
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