X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/d07a96a0f0c11b98ecc927f0b3e0b052f8ef99f7..2935de4fbccf43b7daedb9412f2ada1bf65c52ab:/services/api/app/middlewares/arvados_api_token.rb

diff --git a/services/api/app/middlewares/arvados_api_token.rb b/services/api/app/middlewares/arvados_api_token.rb
index fac1916abd..57d3ad02d7 100644
--- a/services/api/app/middlewares/arvados_api_token.rb
+++ b/services/api/app/middlewares/arvados_api_token.rb
@@ -1,10 +1,19 @@
+# Perform api_token checking very early in the request process.  We want to do
+# this in the Rack stack instead of in ApplicationController because
+# websockets needs access to authentication but doesn't use any of the rails
+# active dispatch infrastructure.
 class ArvadosApiToken
+
+  # Create a new ArvadosApiToken handler
+  # +app+  The next layer of the Rack stack.
   def initialize(app = nil, options = nil)
     @app = app if app.respond_to?(:call)
   end
 
   def call env
-    # first, clean up just in case
+    # First, clean up just in case we have a multithreaded server and thread
+    # local variables are still set from a prior request.  Also useful for
+    # tests that call this code to set up the environment.
     Thread.current[:api_client_ip_address] = nil
     Thread.current[:api_client_authorization] = nil
     Thread.current[:api_client_uuid] = nil
@@ -47,6 +56,6 @@ class ArvadosApiToken
       api_client_auth.save validate: false
     end
 
-    @app.call env
+    @app.call env if @app
   end
 end