KEYCLOAK-15498 Disable gzip encoding when themes are not cached

server-spi/src/main/java/org/keycloak/models/ThemeManager.java

@@ -34,6 +34,8 @@ public interface ThemeManager {
      */
     Set<String> nameSet(Theme.Type type);
 
+    boolean isCacheEnabled();
+
     void clearCache();
 
 }

services/src/main/java/org/keycloak/services/resources/ThemeResource.java

@@ -63,7 +63,7 @@ public class ThemeResource {
         try {
             String contentType = MimeTypeUtil.getContentType(path);
             Theme theme = session.theme().getTheme(themeName, Theme.Type.valueOf(themType.toUpperCase()));
-            ResourceEncodingProvider encodingProvider = ResourceEncodingHelper.getResourceEncodingProvider(session, contentType);
+            ResourceEncodingProvider encodingProvider = session.theme().isCacheEnabled() ? ResourceEncodingHelper.getResourceEncodingProvider(session, contentType) : null;
 
             InputStream resource;
             if (encodingProvider != null) {

services/src/main/java/org/keycloak/theme/DefaultThemeManager.java

@@ -93,6 +93,11 @@ public class DefaultThemeManager implements ThemeManager {
         return themes;
     }
 
+    @Override
+    public boolean isCacheEnabled() {
+        return factory.isCacheEnabled();
+    }
+
     @Override
     public void clearCache() {
         factory.clearCache();

services/src/main/java/org/keycloak/theme/DefaultThemeManagerFactory.java

@@ -69,6 +69,10 @@ public class DefaultThemeManagerFactory {
         return theme;
     }
 
+    public boolean isCacheEnabled() {
+        return themeCache != null;
+    }
+
     public void clearCache() {
         if (themeCache != null) {
             themeCache.clear();