Support custom local entity ID (issuer)

Author: danilopiazza

docker-compose.yml

@@ -6,5 +6,5 @@ services:
       - 10080:8080
       - 10443:8443
     environment:
-      - SIMPLESAMLPHP_SP_ENTITY_ID=http://localhost:8080/saml2/service-provider-metadata/spring-boot-saml-poc
+      - SIMPLESAMLPHP_SP_ENTITY_ID=issuer.example.com
       - SIMPLESAMLPHP_SP_ASSERTION_CONSUMER_SERVICE=http://localhost:8080/login/saml2/sso/spring-boot-saml-poc

src/main/java/io/github/danilopiazza/spring/boot/saml/config/Saml2LoginConfig.java

@@ -44,7 +44,7 @@ private RelyingPartyRegistration relyingPartiRegistration() {
         // local registration ID
         String registrationId = "spring-boot-saml-poc";
         // local entity ID - autogenerated based on URL
-        String localEntityIdTemplate = "{baseUrl}/saml2/service-provider-metadata/{registrationId}";
+        String localEntityIdTemplate = "issuer.example.com";
         // local SSO URL - autogenerated, endpoint to receive SAML Response objects
         String acsUrlTemplate = "{baseUrl}/login/saml2/sso/{registrationId}";
         // local signing (and local decryption key and remote encryption certificate)