From 690a12ceba542e023f95efec3f3e50f93b7c2261 Mon Sep 17 00:00:00 2001
From: Joshua Arts <josha5@outlook.com>
Date: Fri, 20 Jul 2018 16:04:50 -0400
Subject: [PATCH] add relative root to ldap callback path

---
 config/initializers/omniauth.rb | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/config/initializers/omniauth.rb b/config/initializers/omniauth.rb
index 4cfbbcd8..51b9f896 100644
--- a/config/initializers/omniauth.rb
+++ b/config/initializers/omniauth.rb
@@ -47,3 +47,27 @@ end
 OmniAuth.config.on_failure = proc { |env|
   OmniAuth::FailureEndpoint.new(env).redirect_to_failure
 }
+
+# Work around beacuse callback_url option causes
+# omniauth.auth to be nil in the authhash when
+# authenticating with LDAP.
+module OmniAuthLDAPExt
+  def request_phase
+    rel_root = ENV['RELATIVE_URL_ROOT'].present? ? ENV['RELATIVE_URL_ROOT'] : '/b'
+
+    @callback_path = nil
+    path = options[:callback_path]
+    options[:callback_path] = "#{rel_root if Rails.env == 'production'}/auth/ldap/callback"
+    form = super
+    options[:callback_path] = path
+    form
+  end
+end
+
+module OmniAuth
+  module Strategies
+    class LDAP
+      prepend OmniAuthLDAPExt
+    end
+  end
+end