GRN2-xx: Added option to specify different redirect url for google auth (#1016)

* Added option to specify different redirect url for google auth

* Made the redirect url generic so it works with 365

Co-authored-by: Jesus Federico <jesus@123it.ca>

config/initializers/omniauth.rb

@@ -46,12 +46,14 @@ Rails.application.config.middleware.use OmniAuth::Builder do
         scope: %w(profile email),
         access_type: 'online',
         name: 'google',
+        redirect_uri: ENV['OAUTH2_REDIRECT'].presence || nil,
         setup: SETUP_PROC
     end
     if Rails.configuration.omniauth_office365
       Rails.application.config.providers << :office365
 
       provider :office365, ENV['OFFICE365_KEY'], ENV['OFFICE365_SECRET'],
+      redirect_uri: ENV['OAUTH2_REDIRECT'].presence || nil,
       setup: SETUP_PROC
     end
   end

sample.env

@@ -44,6 +44,10 @@ OFFICE365_KEY=
 OFFICE365_SECRET=
 OFFICE365_HD=
 
+# OAUTH2_REDIRECT allows you to specify the redirect_url passed to oauth on sign in.
+# It is useful for cases when Greenlight is deployed behind a Network Load Balancer or proxy
+OAUTH2_REDIRECT=
+
 # LDAP Login Provider (optional)
 #
 # You can enable LDAP authentication by providing values for the variables below.