Issue #265: Created LabelService to support UI localization

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);
+    }
+}