Fix CAS_DISPLAY_NAME, SAML_DISPLAY_NAME and OIDC_DISPLAY_NAME being ignored (#18568)

app/helpers/application_helper.rb

@@ -83,7 +83,8 @@ module ApplicationHelper
   end
 
   def provider_sign_in_link(provider)
-    link_to I18n.t("auth.providers.#{provider}", default: provider.to_s.chomp('_oauth2').capitalize), omniauth_authorize_path(:user, provider), class: "button button-#{provider}", method: :post
+    label = Devise.omniauth_configs[provider]&.strategy&.display_name.presence || I18n.t("auth.providers.#{provider}", default: provider.to_s.chomp('_oauth2').capitalize)
+    link_to label, omniauth_authorize_path(:user, provider), class: "button button-#{provider}", method: :post
   end
 
   def open_deletion?

config/initializers/omniauth.rb

@@ -9,7 +9,7 @@ Devise.setup do |config|
   # CAS strategy
   if ENV['CAS_ENABLED'] == 'true'
     cas_options = {}
-    cas_options[:display_name] = ENV['CAS_DISPLAY_NAME'] || 'cas'
+    cas_options[:display_name] = ENV['CAS_DISPLAY_NAME']
     cas_options[:url] = ENV['CAS_URL'] if ENV['CAS_URL']
     cas_options[:host] = ENV['CAS_HOST'] if ENV['CAS_HOST']
     cas_options[:port] = ENV['CAS_PORT'] if ENV['CAS_PORT']
@@ -38,7 +38,7 @@ Devise.setup do |config|
   # SAML strategy
   if ENV['SAML_ENABLED'] == 'true'
     saml_options = {}
-    saml_options[:display_name] = ENV['SAML_DISPLAY_NAME'] || 'saml'
+    saml_options[:display_name] = ENV['SAML_DISPLAY_NAME']
     saml_options[:assertion_consumer_service_url] = ENV['SAML_ACS_URL'] if ENV['SAML_ACS_URL']
     saml_options[:issuer] = ENV['SAML_ISSUER'] if ENV['SAML_ISSUER']
     saml_options[:idp_sso_target_url] = ENV['SAML_IDP_SSO_TARGET_URL'] if ENV['SAML_IDP_SSO_TARGET_URL']
@@ -70,7 +70,7 @@ Devise.setup do |config|
   # OpenID Connect Strategy
   if ENV['OIDC_ENABLED'] == 'true'
     oidc_options = {}
-    oidc_options[:display_name] = ENV['OIDC_DISPLAY_NAME'] || 'openid_connect' #OPTIONAL
+    oidc_options[:display_name] = ENV['OIDC_DISPLAY_NAME'] #OPTIONAL
     oidc_options[:issuer] = ENV['OIDC_ISSUER'] if ENV['OIDC_ISSUER'] #NEED
     oidc_options[:discovery] = ENV['OIDC_DISCOVERY'] == 'true' if ENV['OIDC_DISCOVERY'] #OPTIONAL (default: false)
     oidc_options[:client_auth_method] =  ENV['OIDC_CLIENT_AUTH_METHOD'] if ENV['OIDC_CLIENT_AUTH_METHOD'] #OPTIONAL (default: basic)