Re-enable SAML 2.0 samples with Okta IdP

Closes gh-55

servlet/spring-boot/java/saml2/refreshable-metadata/src/main/java/example/IndexController.java

@@ -27,7 +27,7 @@ public class IndexController {
 
 	@GetMapping("/")
 	public String index(Model model, @AuthenticationPrincipal Saml2AuthenticatedPrincipal principal) {
-		String emailAddress = principal.getFirstAttribute("emailAddress");
+		String emailAddress = principal.getFirstAttribute("email");
 		model.addAttribute("emailAddress", emailAddress);
 		model.addAttribute("userAttributes", principal.getAttributes());
 		return "index";

servlet/spring-boot/java/saml2/refreshable-metadata/src/main/resources/application.yml

@@ -8,7 +8,7 @@ spring:
               - private-key-location: classpath:credentials/rp-private.key
                 certificate-location: classpath:credentials/rp-certificate.crt
             identityprovider:
-              metadata-uri: https://simplesaml-for-spring-saml.apps.pcfone.io/saml2/idp/metadata.php
+              metadata-uri: https://dev-05937739.okta.com/app/exk46xofd8NZvFCpS5d7/sso/saml/metadata
 
 logging.level:
   org.springframework.security: TRACE

servlet/spring-boot/java/saml2/refreshable-metadata/src/main/resources/templates/index.html

@@ -36,11 +36,6 @@
                 </button>
             </form>
         </li>
-        <li class="nav-item">
-            <a id="ap_logout_button" class="nav-link" href="https://simplesaml-for-spring-saml.apps.pcfone.io/saml2/idp/SingleLogoutService.php?ReturnTo=http://localhost:8080/login?logout">
-                AP-initiated Logout
-            </a>
-        </li>
     </ul>
     </div>
     <main role="main" class="container">