Handle LDAP missing credentials error with a flash message.

If a user fails to provide a username or password to the LDAP login
form then a 500 error is returned due to an exception being raised
in omniauth-ldap. This gem has been amended to use the omniauth
error propagation function (fail!) to pass this exception message to
the registered omniauth failure handler so that the Rails application
can handle it approriately.

The failure function now knows about standard exceptions and no longer
requires a specific check for the OmniAuth::Error exception added by
commit f322975.

This resolves issue #1077.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

1 files changed, 4 insertions, 7 deletions

diff --git a/app/controllers/omniauth_callbacks_controller.rb b/app/controllers/omniauth_callbacks_controller.rb
index fb759c371c4..d19931e93d7 100644
--- a/app/controllers/omniauth_callbacks_controller.rb
+++ b/app/controllers/omniauth_callbacks_controller.rb
@@ -3,13 +3,10 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
   # Extend the standard message generation to accept our custom exception
   def failure_message
     exception = env["omniauth.error"]
-    if exception.class == OmniAuth::Error
-      error = exception.message
-    else
-      error   = exception.error_reason if exception.respond_to?(:error_reason)
-      error ||= exception.error        if exception.respond_to?(:error)
-      error ||= env["omniauth.error.type"].to_s
-    end
+    error   = exception.error_reason if exception.respond_to?(:error_reason)
+    error ||= exception.error        if exception.respond_to?(:error)
+    error ||= exception.message      if exception.respond_to?(:message)
+    error ||= env["omniauth.error.type"].to_s
     error.to_s.humanize if error
   end