Reject non json formats

Author: philippthun

app/controllers/v3/application_controller.rb

@@ -68,6 +68,7 @@ class ApplicationController < ActionController::Base
   before_action :check_write_permissions!, if: :enforce_write_scope?
   before_action :hashify_params
   before_action :null_coalesce_body
+  before_action :reject_non_json_formats
 
   rescue_from CloudController::Blobstore::BlobstoreError, with: :handle_blobstore_error
   rescue_from CloudController::Errors::NotAuthenticated, with: :handle_not_authenticated
@@ -211,6 +212,10 @@ def null_coalesce_body
     hashed_params[:body] ||= {}
   end
 
+  def reject_non_json_formats
+    unprocessable!('Unsupported format') if hashed_params.include?(:format) && hashed_params[:format] != 'json'
+  end
+
   def membership
     @membership ||= Membership.new(current_user)
   end