feat: translate backend

src/main/java/fr/titionfire/ffsaf/UserInfoProvider.java

@@ -0,0 +1,48 @@
+package fr.titionfire.ffsaf;
+
+import fr.titionfire.ffsaf.domain.service.TradService;
+import jakarta.ws.rs.container.ContainerRequestContext;
+import jakarta.ws.rs.container.ContainerRequestFilter;
+import jakarta.ws.rs.container.PreMatching;
+import jakarta.ws.rs.ext.Provider;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+
+@Provider
+@PreMatching
+public class UserInfoProvider implements ContainerRequestFilter {
+
+    private static final List<Locale> SUPPORTED_LANGUAGES = Arrays.asList(
+            Locale.FRENCH,
+            Locale.ENGLISH
+    );
+
+    @Override
+    public void filter(ContainerRequestContext requestContext) {
+        List<Locale> acceptableLanguages = requestContext.getAcceptableLanguages();
+        Locale selectedLocale = findFirstSupportedLanguage(acceptableLanguages);
+
+        if (selectedLocale == null)
+            selectedLocale = TradService.fallbackLocale;
+        requestContext.setProperty("userLocale", selectedLocale);
+    }
+
+    private Locale findFirstSupportedLanguage(List<Locale> acceptableLanguages) {
+        for (Locale acceptableLanguage : acceptableLanguages) {
+            // Vérifie si la langue est dans la liste des langues supportées
+            if (SUPPORTED_LANGUAGES.contains(acceptableLanguage)) {
+                return acceptableLanguage;
+            }
+            // Vérifie aussi par tag de langue (ex: "fr-FR" -> "fr")
+            String languageTag = acceptableLanguage.getLanguage();
+            for (Locale supportedLanguage : SUPPORTED_LANGUAGES) {
+                if (supportedLanguage.getLanguage().equals(languageTag)) {
+                    return supportedLanguage;
+                }
+            }
+        }
+        return null;
+    }
+}