KEYCLOAK-8818 Support message bundle in theme resources

server-spi/src/main/java/org/keycloak/theme/ThemeResourceProvider.java

@@ -17,12 +17,13 @@
 
 package org.keycloak.theme;
 
-import org.keycloak.provider.Provider;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
-import java.util.Set;
+import java.util.Locale;
+import java.util.Properties;
+
+import org.keycloak.provider.Provider;
 
 /**
  * A theme resource provider can be used to load additional templates and resources. An example use of this would be
@@ -53,4 +54,17 @@ public interface ThemeResourceProvider extends Provider {
      */
     InputStream getResourceAsStream(String path) throws IOException;
 
+    /**
+     * Load the message bundle for the specific name and locale
+     * 
+     * @param baseBundlename The base name of the bundle, such as "messages" in
+     * messages_en.properties.
+     * @param locale The locale of the desired message bundle.
+     * @return The localized messages from the bundle.
+     * @throws IOException If bundle can not be read.
+     */
+    default Properties getMessages(String baseBundlename, Locale locale) throws IOException{
+        return new Properties();
+    }
+
 }

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

@@ -1,17 +1,24 @@
 package org.keycloak.theme;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.URL;
+import java.nio.charset.Charset;
+import java.util.Locale;
+import java.util.Properties;
+
 import org.keycloak.Config;
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.KeycloakSessionFactory;
 
-import java.io.IOException;
-import java.io.InputStream;
-import java.net.URL;
-
 public class ClasspathThemeResourceProviderFactory implements ThemeResourceProviderFactory, ThemeResourceProvider {
 
     public static final String THEME_RESOURCES_TEMPLATES = "theme-resources/templates/";
     public static final String THEME_RESOURCES_RESOURCES = "theme-resources/resources/";
+    public static final String THEME_RESOURCES_MESSAGES = "theme-resources/messages/";
+
     private final String id;
     private final ClassLoader classLoader;
 
@@ -35,6 +42,21 @@ public class ClasspathThemeResourceProviderFactory implements ThemeResourceProvi
         return classLoader.getResourceAsStream(THEME_RESOURCES_RESOURCES + path);
     }
 
+    @Override
+    public Properties getMessages(String baseBundlename, Locale locale) throws IOException {
+        Properties m = new Properties();
+        InputStream in = classLoader.getResourceAsStream(THEME_RESOURCES_MESSAGES + baseBundlename + "_" + locale.toString() + ".properties");
+        if(in != null){
+            Charset encoding = PropertiesUtil.detectEncoding(in);
+            // detectEncoding closes the stream
+            try (Reader reader = new InputStreamReader(
+                        classLoader.getResourceAsStream(THEME_RESOURCES_MESSAGES + baseBundlename + "_" + locale.toString() + ".properties"), encoding)) {
+                m.load(reader);
+            }
+        }
+        return m;
+    }
+
     @Override
     public String getId() {
         return id;

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

@@ -257,6 +257,10 @@ public class ExtendingThemeManager implements ThemeProvider {
                     messages.putAll(getMessages(baseBundlename, Locale.ENGLISH));
                 }
 
+                for (ThemeResourceProvider t : themeResourceProviders ){
+                    messages.putAll(t.getMessages(baseBundlename, locale));
+                }
+
                 ListIterator<Theme> itr = themes.listIterator(themes.size());
                 while (itr.hasPrevious()) {
                     Properties m = itr.previous().getMessages(baseBundlename, locale);

testsuite/integration-arquillian/servers/auth-server/services/testsuite-providers/src/main/resources/theme-resources/messages/messages_en.properties

@@ -0,0 +1,2 @@
+test.keycloak-8818= Hello from theme-resources
+fullName=Full name (Theme-resources)

testsuite/integration-arquillian/tests/base/src/test/java/org/keycloak/testsuite/theme/ThemeResourceProviderTest.java

@@ -1,5 +1,8 @@
 package org.keycloak.testsuite.theme;
 
+import java.io.IOException;
+import java.util.Locale;
+
 import org.jboss.arquillian.container.test.api.Deployment;
 import org.jboss.shrinkwrap.api.spec.WebArchive;
 import org.junit.Assert;
@@ -10,8 +13,6 @@ import org.keycloak.testsuite.runonserver.RunOnServerDeployment;
 import org.keycloak.theme.Theme;
 import org.keycloak.theme.ThemeProvider;
 
-import java.io.IOException;
-
 public class ThemeResourceProviderTest extends AbstractTestRealmKeycloakTest {
 
     @Deployment
@@ -50,4 +51,17 @@ public class ThemeResourceProviderTest extends AbstractTestRealmKeycloakTest {
         });
     }
 
+    @Test
+    public void getMessages() {
+        testingClient.server().run(session -> {
+            try {
+                ThemeProvider extending = session.getProvider(ThemeProvider.class, "extending");
+                Theme theme = extending.getTheme("base", Theme.Type.LOGIN);
+                Assert.assertNotNull(theme.getMessages("messages", Locale.ENGLISH).get("test.keycloak-8818"));
+                Assert.assertNotEquals("Full name (Theme-resources)", theme.getMessages("messages", Locale.ENGLISH).get("fullName"));
+            } catch (IOException e) {
+                Assert.fail(e.getMessage());
+            }
+        });
+    }
 }