Supported WAR files in FileResolver (#4747)

See #4727

Signed-off-by: Thomas Segismont <tsegismont@gmail.com>

src/main/java/io/vertx/core/file/impl/FileResolverImpl.java

@@ -279,24 +279,30 @@ private File unpackFromJarURL(URL url, String fileName, ClassLoader cl) {
     ZipFile zip = null;
     try {
       String path = url.getPath();
-      int idx1 = path.lastIndexOf(".jar!");
-      if (idx1 == -1) {
-        idx1 = path.lastIndexOf(".zip!");
-      }
-      int idx2 = path.lastIndexOf(".jar!", idx1 - 1);
-      if (idx2 == -1) {
-        idx2 = path.lastIndexOf(".zip!", idx1 - 1);
+      int idx1 = -1, idx2 = -1;
+      for (int i = path.length() - 1; i > 4; ) {
+        if (path.charAt(i) == '!' && (path.startsWith(".jar", i - 4) || path.startsWith(".zip", i - 4) || path.startsWith(".war", i - 4))) {
+          if (idx1 == -1) {
+            idx1 = i;
+            i -= 4;
+            continue;
+          } else {
+            idx2 = i;
+            break;
+          }
+        }
+        i--;
       }
       if (idx2 == -1) {
-        File file = new File(decodeURIComponent(path.substring(5, idx1 + 4), false));
+        File file = new File(decodeURIComponent(path.substring(5, idx1), false));
         zip = new ZipFile(file);
       } else {
-        String s = path.substring(idx2 + 6, idx1 + 4);
+        String s = path.substring(idx2 + 2, idx1);
         File file = resolveFile(s);
         zip = new ZipFile(file);
       }
 
-      String inJarPath = path.substring(idx1 + 6);
+      String inJarPath = path.substring(idx1 + 2);
       StringBuilder prefixBuilder = new StringBuilder();
       int first = 0;
       int second;

src/test/java/io/vertx/core/file/WarFileResolverTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2011-2023 Contributors to the Eclipse Foundation
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+ * which is available at https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+ */
+
+package io.vertx.core.file;
+
+import io.vertx.test.core.TestUtils;
+import org.junit.Assert;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.util.jar.JarEntry;
+import java.util.jar.JarOutputStream;
+
+public class WarFileResolverTest extends FileResolverTestBase {
+
+  static File getFiles(File baseDir) throws Exception {
+    File file = Files.createTempFile(TestUtils.MAVEN_TARGET_DIR.toPath(), "", "files.war").toFile();
+    Assert.assertTrue(file.delete());
+    return ZipFileResolverTest.getFiles(
+      baseDir,
+      file,
+      out -> {
+        try {
+          return new JarOutputStream(out);
+        } catch (IOException e) {
+          throw new AssertionError(e);
+        }
+      }, JarEntry::new);
+  }
+
+  @Override
+  protected ClassLoader resourcesLoader(File baseDir) throws Exception {
+    File files = getFiles(baseDir);
+    return new URLClassLoader(new URL[]{files.toURI().toURL()}, Thread.currentThread().getContextClassLoader());
+  }
+}