Use IDPMetadataParse to set up the Idp SAML settings

Co-authored-by: Anamika Aggarwal <anamikaagg18@gmail.com>

config/initializers/devise.rb

@@ -286,11 +286,12 @@ Devise.setup do |config|
                   Rails.application.secrets.wordpress_oauth2_secret,
                   client_options: { site: Rails.application.secrets.wordpress_oauth2_site },
                   setup: ->(env) { OmniauthTenantSetup.wordpress_oauth2(env) }
-  config.omniauth :saml,
-                  sp_entity_id: Rails.application.secrets.saml_sp_entity_id,
-                  idp_cert: Rails.application.secrets.saml_idp_cert,
-                  idp_sso_service_url: Rails.application.secrets.saml_idp_sso_service_url,
-                  allowed_clock_drift: 1.minute
+  idp_metadata_parser = OneLogin::RubySaml::IdpMetadataParser.new
+  saml_settings = idp_metadata_parser.parse_remote_to_hash(Rails.application.secrets.saml_idp_metadata_url)
+  saml_settings[:idp_sso_service_url] = Rails.application.secrets.saml_idp_sso_service_url
+  saml_settings[:sp_entity_id] = Rails.application.secrets.saml_sp_entity_id
+  saml_settings[:allowed_clock_drift] = 1.minute
+  config.omniauth :saml, saml_settings
 
   # ==> Warden configuration
   # If you want to use other strategies, that are not supported by Devise, or

config/secrets.yml.example

@@ -92,7 +92,7 @@ staging:
   wordpress_oauth2_secret: ""
   wordpress_oauth2_site: ""
   saml_sp_entity_id: ""
-  saml_idp_cert: ""
+  saml_idp_metadata_url: ""
   saml_idp_sso_service_url: ""
   <<: *maps
   <<: *apis
@@ -151,7 +151,7 @@ preproduction:
   wordpress_oauth2_secret: ""
   wordpress_oauth2_site: ""
   saml_sp_entity_id: ""
-  saml_idp_cert: ""
+  saml_idp_metadata_url: ""
   saml_idp_sso_service_url: ""
   <<: *maps
   <<: *apis
@@ -209,7 +209,7 @@ production:
   wordpress_oauth2_secret: ""
   wordpress_oauth2_site: ""
   saml_sp_entity_id: ""
-  saml_idp_cert: ""
+  saml_idp_metadata_url: ""
   saml_idp_sso_service_url: ""
   <<: *maps
   <<: *apis