Merge pull request quarkusio#36228 from nderwin-forks/bugfix/36227

Use java.util.Locale to parse the languages from the Accept-Language header

independent-projects/resteasy-reactive/common/runtime/src/main/java/org/jboss/resteasy/reactive/common/util/LocaleHelper.java

@@ -11,15 +11,7 @@ public static Locale extractLocale(String lang) {
         if (q > -1) {
             lang = lang.substring(0, q);
         }
-        String[] split = lang.trim().split("-");
-        if (split.length == 1) {
-            return new Locale(split[0].toLowerCase());
-        } else if (split.length == 2) {
-            return new Locale(split[0].toLowerCase(), split[1].toLowerCase());
-        } else if (split.length > 2) {
-            return new Locale(split[0], split[1], split[2]);
-        }
-        return null; // unreachable
+        return Locale.forLanguageTag(lang);
     }
 
     /**
@@ -30,10 +22,6 @@ public static Locale extractLocale(String lang) {
      * @return converted language format string
      */
     public static String toLanguageString(Locale value) {
-        StringBuffer buf = new StringBuffer(value.getLanguage().toLowerCase());
-        if (value.getCountry() != null && !value.getCountry().equals("")) {
-            buf.append("-").append(value.getCountry().toLowerCase());
-        }
-        return buf.toString();
+        return value.toLanguageTag();
     }
 }

independent-projects/resteasy-reactive/server/vertx/src/test/java/org/jboss/resteasy/reactive/server/vertx/test/headers/RequestHeaderTest.java

@@ -0,0 +1,172 @@
+package org.jboss.resteasy.reactive.server.vertx.test.headers;
+
+import static org.hamcrest.Matchers.equalToIgnoringCase;
+
+import java.util.Locale;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.HttpHeaders;
+
+import org.jboss.resteasy.reactive.server.vertx.test.framework.ResteasyReactiveUnitTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.restassured.RestAssured;
+
+public class RequestHeaderTest {
+
+    private static final String BASE_PATH = "/test";
+
+    @RegisterExtension
+    static ResteasyReactiveUnitTest TEST = new ResteasyReactiveUnitTest()
+            .addScanCustomizer(scanStep -> scanStep.setSingleDefaultProduces(true))
+            .withApplicationRoot((jar) -> jar.addClasses(TestResource.class));
+
+    @Test
+    public void testISO2Language() {
+        String expected = "en";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testISO3Language() {
+        String expected = "tlh";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testScriptSubtag() {
+        String expected = "zh-Hans";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testRegionSubtag() {
+        String expected = "en-GB";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testRegionSubtag2() {
+        String expected = "es-005";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testRegionSubtag3() {
+        String expected = "zh-Hant-HK";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testVariantSubtag() {
+        String expected = "sl-nedis";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testVariantSubtag2() {
+        String expected = "sl-IT-nedis";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testExtensionSubtag() {
+        String expected = "de-DE-u-co-phonebk";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Test
+    public void testPrivateUseSubtag() {
+        String expected = "en-US-x-twain";
+
+        RestAssured
+                .given()
+                .header(HttpHeaders.ACCEPT_LANGUAGE, expected)
+                .get(BASE_PATH)
+                .then()
+                .statusCode(200)
+                .assertThat().body(equalToIgnoringCase(expected));
+    }
+
+    @Path(BASE_PATH)
+    public static class TestResource {
+
+        @Context
+        HttpHeaders headers;
+
+        @GET
+        public String echo() {
+            final Locale locale = headers.getAcceptableLanguages().isEmpty() ? Locale.ENGLISH
+                    : headers.getAcceptableLanguages().get(0);
+
+            return locale.toLanguageTag();
+        }
+
+    }
+}