[KEYCLOAK-5486] Test email connection feature does not work the second time (#4517)

services/src/main/java/org/keycloak/services/resources/admin/RealmAdminResource.java

@@ -833,6 +833,9 @@ public class RealmAdminResource {
             if (user.getEmail() == null) {
                 return ErrorResponse.error("Logged in user does not have an e-mail.", Response.Status.INTERNAL_SERVER_ERROR);
             }
+            if (ComponentRepresentation.SECRET_VALUE.equals(settings.get("password"))) {
+                settings.put("password", realm.getSmtpConfig().get("password"));
+            }
             session.getProvider(EmailTemplateProvider.class).sendSmtpTestEmail(settings, user);
         } catch (Exception e) {
             e.printStackTrace();

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/admin/SMTPConnectionTest.java

@@ -35,6 +35,7 @@ import java.util.Map;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
+import static org.keycloak.representations.idm.ComponentRepresentation.SECRET_VALUE;
 import static org.keycloak.util.JsonSerialization.writeValueAsPrettyString;
 
 /**
@@ -60,6 +61,11 @@ public class SMTPConnectionTest extends AbstractKeycloakTest {
 
     private String settings(String host, String port, String from, String auth, String ssl, String starttls,
                             String username, String password) throws Exception {
+        Map<String, String> config = smtpMap(host, port, from, auth, ssl, starttls, username, password);
+        return writeValueAsPrettyString(config);
+    }
+
+    private Map<String, String> smtpMap(String host, String port, String from, String auth, String ssl, String starttls, String username, String password) {
         Map<String, String> config = new HashMap<>();
         config.put("host", host);
         config.put("port", port);
@@ -69,7 +75,7 @@ public class SMTPConnectionTest extends AbstractKeycloakTest {
         config.put("starttls", starttls);
         config.put("user", username);
         config.put("password", password);
-        return writeValueAsPrettyString(config);
+        return config;
     }
 
     @Test
@@ -102,6 +108,26 @@ public class SMTPConnectionTest extends AbstractKeycloakTest {
         assertStatus(response, 204);
     }
 
+    @Test
+    public void testAuthEnabledAndSavedCredentials() throws Exception {
+        RealmRepresentation realmRep = realm.toRepresentation();
+        Map<String, String> oldSmtp = realmRep.getSmtpServer();
+        try {
+            realmRep.setSmtpServer(smtpMap("127.0.0.1", "3025", "auto@keycloak.org", "true", null, null,
+                    "admin@localhost", "admin"));
+            realm.update(realmRep);
+
+            greenMailRule.credentials("admin@localhost", "admin");
+            Response response = realm.testSMTPConnection(settings("127.0.0.1", "3025", "auto@keycloak.org", "true", null, null,
+                    "admin@localhost", SECRET_VALUE));
+            assertStatus(response, 204);
+        } finally {
+            // Revert SMTP back
+            realmRep.setSmtpServer(oldSmtp);
+            realm.update(realmRep);
+        }
+    }
+
     private void assertStatus(Response response, int status) {
         assertEquals(status, response.getStatus());
         response.close();