Refactor monkey-patching of Goldfinger (#12561)

app/helpers/webfinger_helper.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module WebfingerHelper
+  def webfinger!(uri)
+    hidden_service_uri = /\.(onion|i2p)(:\d+)?$/.match(uri)
+
+    raise Mastodon::HostValidationError, 'Instance does not support hidden service connections' if !Rails.configuration.x.access_to_hidden_service && hidden_service_uri
+
+    opts = {
+      ssl: !hidden_service_uri,
+
+      headers: {
+        'User-Agent': Mastodon::Version.user_agent,
+      },
+    }
+
+    Goldfinger::Client.new(uri, opts.merge(Rails.configuration.x.http_client_proxy)).finger
+  end
+end

app/models/remote_follow.rb

@@ -3,6 +3,7 @@
 class RemoteFollow
   include ActiveModel::Validations
   include RoutingHelper
+  include WebfingerHelper
 
   attr_accessor :acct, :addressable_template
 
@@ -71,7 +72,7 @@ class RemoteFollow
   end
 
   def acct_resource
-    @acct_resource ||= Goldfinger.finger("acct:#{acct}")
+    @acct_resource ||= webfinger!("acct:#{acct}")
   rescue Goldfinger::Error, HTTP::ConnectionError
     nil
   end

app/services/activitypub/fetch_remote_account_service.rb

@@ -3,6 +3,7 @@
 class ActivityPub::FetchRemoteAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
+  include WebfingerHelper
 
   SUPPORTED_TYPES = %w(Application Group Organization Person Service).freeze
 
@@ -35,12 +36,12 @@ class ActivityPub::FetchRemoteAccountService < BaseService
   private
 
   def verified_webfinger?
-    webfinger                            = Goldfinger.finger("acct:#{@username}@#{@domain}")
+    webfinger                            = webfinger!("acct:#{@username}@#{@domain}")
     confirmed_username, confirmed_domain = split_acct(webfinger.subject)
 
     return webfinger.link('self')&.href == @uri if @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
 
-    webfinger                            = Goldfinger.finger("acct:#{confirmed_username}@#{confirmed_domain}")
+    webfinger                            = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
     @username, @domain                   = split_acct(webfinger.subject)
     self_reference                       = webfinger.link('self')
 

app/services/resolve_account_service.rb

@@ -3,6 +3,7 @@
 class ResolveAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
+  include WebfingerHelper
 
   class WebfingerRedirectError < StandardError; end
 
@@ -76,7 +77,7 @@ class ResolveAccountService < BaseService
   end
 
   def process_webfinger!(uri, redirected = false)
-    @webfinger                           = Goldfinger.finger("acct:#{uri}")
+    @webfinger                           = webfinger!("acct:#{uri}")
     confirmed_username, confirmed_domain = @webfinger.subject.gsub(/\Aacct:/, '').split('@')
 
     if confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?