Issue #265: Created LabelService to support UI localization

webgoat-container/src/main/java/org/owasp/webgoat/i18n/ExposedReloadableResourceMessageBundleSource.java

@@ -0,0 +1,24 @@
+package org.owasp.webgoat.i18n;
+
+import org.springframework.context.support.ReloadableResourceBundleMessageSource;
+
+import java.util.Locale;
+import java.util.Properties;
+
+/**
+ * <p>ExposedReloadableResourceMessageBundleSource class.</p>
+ * Extends the reloadable message source with a way to get all messages
+ *
+ * @author zupzup
+ */
+
+public class ExposedReloadableResourceMessageBundleSource extends ReloadableResourceBundleMessageSource {
+    /**
+     * Gets all messages for presented Locale.
+     * @param locale user request's locale
+     * @return all messages
+     */
+    public Properties getMessages(Locale locale) {
+        return getMergedProperties(locale).getProperties();
+    }
+}

webgoat-container/src/main/java/org/owasp/webgoat/i18n/LabelProvider.java

@@ -9,9 +9,7 @@ import org.springframework.stereotype.Component;
 
 import java.net.MalformedURLException;
 import java.nio.file.Path;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Locale;
+import java.util.*;
 
 
 /**
@@ -52,8 +50,8 @@ public class LabelProvider {
 
     private static final List<Locale> SUPPORTED = Arrays.asList(Locale.GERMAN, Locale.FRENCH, Locale.ENGLISH,
             Locale.forLanguageTag("ru"));
-    private final ReloadableResourceBundleMessageSource labels = new ReloadableResourceBundleMessageSource();
-    private static final ReloadableResourceBundleMessageSource pluginLabels = new ReloadableResourceBundleMessageSource();
+    private final ExposedReloadableResourceMessageBundleSource labels = new ExposedReloadableResourceMessageBundleSource();
+    private static final ExposedReloadableResourceMessageBundleSource pluginLabels = new ExposedReloadableResourceMessageBundleSource();
 
     /**
      * <p>Constructor for LabelProvider.</p>
@@ -104,7 +102,27 @@ public class LabelProvider {
     }
 
     private Locale useLocaleOrFallbackToEnglish(Locale locale) {
-        return SUPPORTED.contains(locale) ? Locale.ENGLISH : locale;
+        return SUPPORTED.contains(locale) ? locale : Locale.ENGLISH;
+    }
+
+    /**
+     * <p>getLabels.</p>
+     * Returns a merged map of all the labels for a specified language or the
+     * default language, if the given language is not supported
+     *
+     * @param locale The Locale to get all the labels for
+     * @return A Map of all properties with their values
+     */
+    public Map<String, String> getLabels(Locale locale) {
+        Properties messages = labels.getMessages(locale);
+        messages.putAll(pluginLabels.getMessages(useLocaleOrFallbackToEnglish(locale)));
+        Map<String,String> labelsMap = new HashMap<>();
+        for (Map.Entry<Object, Object> entry : messages.entrySet()) {
+            if (entry.getKey() != null && entry.getValue() != null) {
+                labelsMap.put(entry.getKey().toString(), entry.getValue().toString());
+            }
+        }
+        return labelsMap;
     }
 
 }

webgoat-container/src/main/java/org/owasp/webgoat/service/LabelService.java

@@ -0,0 +1,63 @@
+package org.owasp.webgoat.service;
+
+import org.owasp.webgoat.i18n.LabelProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.util.StringUtils;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import javax.servlet.http.HttpServletRequest;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+
+/**
+ * <p>LabelService class.</p>
+ *
+ * @author zupzup
+ */
+
+@Controller
+public class LabelService {
+
+    private static final String URL_LABELS_MVC = "/service/labels.mvc";
+
+    private static final Logger logger = LoggerFactory.getLogger(LabelService.class);
+
+    @Autowired
+    private LabelProvider labelProvider;
+
+    /**
+     * Fetches labels for given language
+     * If no language is provided, the language is determined from the request headers
+     * Otherwise, fall back to default language
+     *
+     * @param lang the language to fetch labels for (optional)
+     * @return a map of labels
+     * @throws Exception
+     */
+    @RequestMapping(path = URL_LABELS_MVC, produces = MediaType.APPLICATION_JSON_VALUE)
+    public @ResponseBody
+    ResponseEntity<Map<String, String>> fetchLabels(@RequestParam(value = "lang", required = false) String lang, HttpServletRequest request) throws Exception {
+        Locale locale;
+        if (StringUtils.isEmpty(lang)) {
+            logger.debug("No language provided, determining from request headers");
+            locale = request.getLocale();
+            if (locale != null) {
+                logger.debug("Locale set to {}", locale);
+            }
+        } else {
+            locale = Locale.forLanguageTag(lang);
+            logger.debug("Language provided: {} leads to Locale: {}", lang, locale);
+        }
+        return new ResponseEntity<>(labelProvider.getLabels(locale), HttpStatus.OK);
+    }
+}

webgoat-container/src/test/java/org/owasp/webgoat/util/LabelProviderTest.java

@@ -17,4 +17,18 @@ public class LabelProviderTest  {
                 "Congratulations. You have successfully completed this lesson."));
     }
 
+    @Test
+    public void shouldFallBackToEnglishIfLanguageNotSupported() {
+        LabelProvider labelProvider = new LabelProvider();
+        assertThat(labelProvider.get(Locale.CHINESE, "LessonCompleted"), CoreMatchers.equalTo(
+                "Congratulations. You have successfully completed this lesson."));
+    }
+
+    @Test
+    public void shouldUseProvidedLanguageIfSupported() {
+        LabelProvider labelProvider = new LabelProvider();
+        assertThat(labelProvider.get(Locale.GERMAN, "RestartLesson"), CoreMatchers.equalTo(
+                "Lektion neu beginnen"));
+    }
+
 }