Allow turning keybase off instance-wide

app/controllers/settings/identity_proofs_controller.rb

@@ -5,6 +5,7 @@ class Settings::IdentityProofsController < Settings::BaseController
 
   before_action :authenticate_user!
   before_action :check_required_params, only: :new
+  before_action :check_enabled, only: :new
 
   def index
     @proofs = AccountIdentityProof.where(account: current_account).order(provider: :asc, provider_username: :asc)
@@ -41,6 +42,10 @@ class Settings::IdentityProofsController < Settings::BaseController
 
   private
 
+  def check_enabled
+    not_found unless Setting.enable_keybase
+  end
+
   def check_required_params
     redirect_to settings_identity_proofs_path unless [:provider, :provider_username, :username, :token].all? { |k| params[k].present? }
   end

app/controllers/well_known/keybase_proof_config_controller.rb

@@ -2,8 +2,16 @@
 
 module WellKnown
   class KeybaseProofConfigController < ActionController::Base
+    before_action :check_enabled
+
     def show
       render json: {}, serializer: ProofProvider::Keybase::ConfigSerializer
     end
+
+    private
+
+    def check_enabled
+      head 404 unless Setting.enable_keybase
+    end
   end
 end