81 lines
3.0 KiB
Ruby
81 lines
3.0 KiB
Ruby
# frozen_string_literal: true
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class ActivityPub::FetchRemoteAccountService < BaseService
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include JsonLdHelper
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include DomainControlHelper
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include WebfingerHelper
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class Error < StandardError; end
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SUPPORTED_TYPES = %w(Application Group Organization Person Service).freeze
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# Does a WebFinger roundtrip on each call, unless `only_key` is true
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def call(uri, id: true, prefetched_body: nil, break_on_redirect: false, only_key: false, suppress_errors: true)
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return if domain_not_allowed?(uri)
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return ActivityPub::TagManager.instance.uri_to_resource(uri, Account) if ActivityPub::TagManager.instance.local_uri?(uri)
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@json = begin
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if prefetched_body.nil?
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fetch_resource(uri, id)
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else
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body_to_json(prefetched_body, compare_id: id ? uri : nil)
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end
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rescue Oj::ParseError
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raise Error, "Error parsing JSON-LD document #{uri}"
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end
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raise Error, "Error fetching actor JSON at #{uri}" if @json.nil?
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raise Error, "Unsupported JSON-LD context for document #{uri}" unless supported_context?
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raise Error, "Unexpected object type for actor #{uri} (expected any of: #{SUPPORTED_TYPES})" unless expected_type?
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raise Error, "Actor #{uri} has moved to #{@json['movedTo']}" if break_on_redirect && @json['movedTo'].present?
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@uri = @json['id']
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@username = @json['preferredUsername']
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@domain = Addressable::URI.parse(@uri).normalized_host
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check_webfinger! unless only_key
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ActivityPub::ProcessAccountService.new.call(@username, @domain, @json, only_key: only_key, verified_webfinger: !only_key)
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rescue Error => e
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Rails.logger.debug "Fetching account #{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 check_webfinger!
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webfinger = webfinger!("acct:#{@username}@#{@domain}")
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confirmed_username, confirmed_domain = split_acct(webfinger.subject)
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if @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
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raise Error, "Webfinger response for #{@username}@#{@domain} does not loop back to #{@uri}" if webfinger.link('self', 'href') != @uri
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return
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end
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webfinger = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
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@username, @domain = split_acct(webfinger.subject)
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unless confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?
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raise Webfinger::RedirectError, "Too many webfinger redirects for URI #{uri} (stopped at #{@username}@#{@domain})"
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end
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raise Error, "Webfinger response for #{@username}@#{@domain} does not loop back to #{@uri}" if webfinger.link('self', 'href') != @uri
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rescue Webfinger::RedirectError => e
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raise Error, e.message
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rescue Webfinger::Error => e
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raise Error, "Webfinger error when resolving #{@username}@#{@domain}: #{e.message}"
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end
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def split_acct(acct)
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acct.gsub(/\Aacct:/, '').split('@')
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end
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def supported_context?
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super(@json)
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end
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def expected_type?
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equals_or_includes_any?(@json['type'], SUPPORTED_TYPES)
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end
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end
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