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-rw-r--r--app/controllers/api/base_controller.rb8
-rw-r--r--app/controllers/application_controller.rb12
-rw-r--r--app/views/errors/400.html.haml5
-rw-r--r--app/views/errors/406.html.haml5
-rw-r--r--app/views/errors/503.html.haml5
5 files changed, 34 insertions, 1 deletions
diff --git a/app/controllers/api/base_controller.rb b/app/controllers/api/base_controller.rb
index de8fff30e..33df75b37 100644
--- a/app/controllers/api/base_controller.rb
+++ b/app/controllers/api/base_controller.rb
@@ -36,6 +36,14 @@ class Api::BaseController < ApplicationController
     render json: { error: 'This action is not allowed' }, status: 403
   end
 
+  rescue_from Mastodon::RaceConditionError do
+    render json: { error: 'There was a temporary problem serving your request, please try again' }, status: 503
+  end
+
+  rescue_from ActionController::ParameterMissing do |e|
+    render json: { error: e.to_s }, status: 400
+  end
+
   def doorkeeper_unauthorized_render_options(error: nil)
     { json: { error: (error.try(:description) || 'Not authorized') } }
   end
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 1caaa20f7..5b343a276 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -21,11 +21,13 @@ class ApplicationController < ActionController::Base
   helper_method :whitelist_mode?
 
   rescue_from ActionController::RoutingError, with: :not_found
-  rescue_from ActiveRecord::RecordNotFound, with: :not_found
   rescue_from ActionController::InvalidAuthenticityToken, with: :unprocessable_entity
   rescue_from ActionController::UnknownFormat, with: :not_acceptable
+  rescue_from ActionController::ParameterMissing, with: :bad_request
+  rescue_from ActiveRecord::RecordNotFound, with: :not_found
   rescue_from Mastodon::NotPermittedError, with: :forbidden
   rescue_from HTTP::Error, OpenSSL::SSL::SSLError, with: :internal_server_error
+  rescue_from Mastodon::RaceConditionError, with: :service_unavailable
 
   before_action :store_current_location, except: :raise_not_found, unless: :devise_controller?
   before_action :require_functional!, if: :user_signed_in?
@@ -96,10 +98,18 @@ class ApplicationController < ActionController::Base
     respond_with_error(406)
   end
 
+  def bad_request
+    respond_with_error(400)
+  end
+
   def internal_server_error
     respond_with_error(500)
   end
 
+  def service_unavailable
+    respond_with_error(503)
+  end
+
   def single_user_mode?
     @single_user_mode ||= Rails.configuration.x.single_user_mode && Account.where('id > 0').exists?
   end
diff --git a/app/views/errors/400.html.haml b/app/views/errors/400.html.haml
new file mode 100644
index 000000000..11fbdd40c
--- /dev/null
+++ b/app/views/errors/400.html.haml
@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.400')
+
+- content_for :content do
+  = t('errors.400')
diff --git a/app/views/errors/406.html.haml b/app/views/errors/406.html.haml
new file mode 100644
index 000000000..0ef815df3
--- /dev/null
+++ b/app/views/errors/406.html.haml
@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.406')
+
+- content_for :content do
+  = t('errors.406')
diff --git a/app/views/errors/503.html.haml b/app/views/errors/503.html.haml
new file mode 100644
index 000000000..b0c895aa5
--- /dev/null
+++ b/app/views/errors/503.html.haml
@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.503')
+
+- content_for :content do
+  = t('errors.503')