fix: re-build production bundle if index.html changes (#20729) (CP: 24.4)

flow-server/src/main/java/com/vaadin/flow/server/frontend/BundleValidationUtil.java

@@ -49,6 +49,8 @@
  */
 public final class BundleValidationUtil {
 
+    private static final String FRONTEND_HASHES_STATS_KEY = "frontendHashes";
+
     /**
      * Checks if an application needs a new frontend bundle.
      *
@@ -217,6 +219,20 @@ private static boolean needsBuildInternal(Options options,
             // are found missing in bundle.
             return true;
         }
+
+        // In dev mode index html is served from frontend folder, not from
+        // dev-bundle, so rebuild is not required for custom content.
+        if (options.isProductionMode() && BundleValidationUtil
+                .hasCustomIndexHtml(options, statsJson)) {
+            UsageStatistics.markAsUsed("flow/rebundle-reason-custom-index-html",
+                    null);
+            return true;
+        }
+        // index.html hash has already been checked, if needed.
+        // removing it from hashes map to prevent other unnecessary checks
+        statsJson.getObject(FRONTEND_HASHES_STATS_KEY)
+                .remove(FrontendUtils.INDEX_HTML);
+
         if (!BundleValidationUtil.frontendImportsFound(statsJson, options,
                 frontendDependencies)) {
             UsageStatistics.markAsUsed(
@@ -647,7 +663,8 @@ public static boolean frontendImportsFound(JsonObject statsJson,
                         FrontendUtils.FRONTEND_FOLDER_ALIAS.length()))
                 .collect(Collectors.toList());
 
-        final JsonObject frontendHashes = statsJson.getObject("frontendHashes");
+        final JsonObject frontendHashes = statsJson
+                .getObject(FRONTEND_HASHES_STATS_KEY);
         List<String> faultyContent = new ArrayList<>();
 
         for (String jarImport : jarImports) {
@@ -695,6 +712,27 @@ public static boolean frontendImportsFound(JsonObject statsJson,
         return true;
     }
 
+    private static boolean hasCustomIndexHtml(Options options,
+            JsonObject statsJson) throws IOException {
+        File indexHtml = new File(options.getFrontendDirectory(),
+                FrontendUtils.INDEX_HTML);
+        if (indexHtml.exists()) {
+            final JsonObject frontendHashes = statsJson
+                    .getObject(FRONTEND_HASHES_STATS_KEY);
+            String frontendFileContent = FileUtils.readFileToString(indexHtml,
+                    StandardCharsets.UTF_8);
+            List<String> faultyContent = new ArrayList<>();
+            compareFrontendHashes(frontendHashes, faultyContent,
+                    FrontendUtils.INDEX_HTML, frontendFileContent);
+            if (!faultyContent.isEmpty()) {
+                logChangedFiles(faultyContent,
+                        "Detected changed content for frontend files:");
+                return true;
+            }
+        }
+        return false;
+    }
+
     private static boolean indexFileAddedOrDeleted(Options options,
             JsonObject frontendHashes) {
         Collection<String> indexFiles = Arrays.asList(FrontendUtils.INDEX_TS,

flow-server/src/main/resources/vite.generated.ts

@@ -297,6 +297,7 @@ function statsExtracterPlugin(): PluginOption {
       const generatedImports = Array.from(generatedImportsSet).sort();
 
       const frontendFiles: Record<string, string> = {};
+      frontendFiles['index.html'] = createHash('sha256').update(customIndexData.replace(/\r\n/g, '\n'), 'utf8').digest('hex');
 
       const projectFileExtensions = ['.js', '.js.map', '.ts', '.ts.map', '.tsx', '.tsx.map', '.css', '.css.map'];
 

flow-server/src/test/java/com/vaadin/flow/server/frontend/BundleValidationTest.java

@@ -25,7 +25,6 @@
 import org.mockito.Mockito;
 
 import com.vaadin.flow.component.page.AppShellConfigurator;
-import com.vaadin.flow.di.Lookup;
 import com.vaadin.flow.server.Constants;
 import com.vaadin.flow.server.LoadDependenciesOnStartup;
 import com.vaadin.flow.server.Mode;
@@ -44,6 +43,7 @@
 import static com.vaadin.flow.server.Constants.DEV_BUNDLE_JAR_PATH;
 import static com.vaadin.flow.server.Constants.PROD_BUNDLE_JAR_PATH;
 import static com.vaadin.flow.server.frontend.FrontendUtils.DEFAULT_FRONTEND_DIR;
+import static com.vaadin.flow.server.frontend.FrontendUtils.INDEX_HTML;
 
 @RunWith(Parameterized.class)
 public class BundleValidationTest {
@@ -1728,6 +1728,101 @@ public void indexTsDeleted_rebuildRequired() throws IOException {
                 needsBuild);
     }
 
+    @Test
+    public void indexHtmlNotChanged_rebuildNotRequired() throws IOException {
+        createPackageJsonStub(BLANK_PACKAGE_JSON_WITH_HASH);
+
+        File frontendFolder = temporaryFolder
+                .newFolder(FrontendUtils.DEFAULT_FRONTEND_DIR);
+
+        File indexHtml = new File(frontendFolder, FrontendUtils.INDEX_HTML);
+        indexHtml.createNewFile();
+        String defaultIndexHtml = new String(TaskGenerateIndexHtml.class
+                .getResourceAsStream(INDEX_HTML).readAllBytes(),
+                StandardCharsets.UTF_8);
+        FileUtils.write(indexHtml, defaultIndexHtml, StandardCharsets.UTF_8);
+
+        JsonObject stats = getBasicStats();
+        stats.getObject(FRONTEND_HASHES).put(INDEX_HTML,
+                BundleValidationUtil.calculateHash(defaultIndexHtml));
+
+        final FrontendDependenciesScanner depScanner = Mockito
+                .mock(FrontendDependenciesScanner.class);
+
+        setupFrontendUtilsMock(stats);
+
+        boolean needsBuild = BundleValidationUtil.needsBuild(options,
+                depScanner, mode);
+        Assert.assertFalse("Default 'index.html' should not require bundling",
+                needsBuild);
+    }
+
+    @Test
+    public void indexHtmlChanged_productionMode_rebuildRequired()
+            throws IOException {
+        Assume.assumeTrue(mode.isProduction());
+        createPackageJsonStub(BLANK_PACKAGE_JSON_WITH_HASH);
+
+        File frontendFolder = temporaryFolder
+                .newFolder(FrontendUtils.DEFAULT_FRONTEND_DIR);
+
+        File indexHtml = new File(frontendFolder, FrontendUtils.INDEX_HTML);
+        indexHtml.createNewFile();
+        String defaultIndexHtml = new String(
+                getClass().getResourceAsStream(INDEX_HTML).readAllBytes(),
+                StandardCharsets.UTF_8);
+        String customIndexHtml = defaultIndexHtml.replace("<body>",
+                "<body><div>custom content</div>");
+        FileUtils.write(indexHtml, customIndexHtml, StandardCharsets.UTF_8);
+        JsonObject stats = getBasicStats();
+        stats.getObject(FRONTEND_HASHES).put(INDEX_HTML,
+                BundleValidationUtil.calculateHash(defaultIndexHtml));
+
+        final FrontendDependenciesScanner depScanner = Mockito
+                .mock(FrontendDependenciesScanner.class);
+
+        setupFrontendUtilsMock(stats);
+
+        boolean needsBuild = BundleValidationUtil.needsBuild(options,
+                depScanner, mode);
+        Assert.assertTrue(
+                "In production mode, custom 'index.html' should require bundling",
+                needsBuild);
+    }
+
+    @Test
+    public void indexHtmlChanged_developmentMode_rebuildNotRequired()
+            throws IOException {
+        Assume.assumeFalse(mode.isProduction());
+        createPackageJsonStub(BLANK_PACKAGE_JSON_WITH_HASH);
+
+        File frontendFolder = temporaryFolder
+                .newFolder(FrontendUtils.DEFAULT_FRONTEND_DIR);
+
+        File indexHtml = new File(frontendFolder, FrontendUtils.INDEX_HTML);
+        indexHtml.createNewFile();
+        String defaultIndexHtml = new String(
+                getClass().getResourceAsStream(INDEX_HTML).readAllBytes(),
+                StandardCharsets.UTF_8);
+        String customIndexHtml = defaultIndexHtml.replace("<body>",
+                "<body><div>custom content</div>");
+        FileUtils.write(indexHtml, customIndexHtml, StandardCharsets.UTF_8);
+        JsonObject stats = getBasicStats();
+        stats.getObject(FRONTEND_HASHES).put(INDEX_HTML,
+                BundleValidationUtil.calculateHash(defaultIndexHtml));
+
+        final FrontendDependenciesScanner depScanner = Mockito
+                .mock(FrontendDependenciesScanner.class);
+
+        setupFrontendUtilsMock(stats);
+
+        boolean needsBuild = BundleValidationUtil.needsBuild(options,
+                depScanner, mode);
+        Assert.assertFalse(
+                "In dev mode, custom 'index.html' should not require bundling",
+                needsBuild);
+    }
+
     @Test
     public void standardVaadinComponent_notAddedToProjectAsJar_noRebuildRequired()
             throws IOException {

flow-tests/test-express-build/test-parent-theme-in-frontend-prod/src/main/frontend/index.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!--
+This file is auto-generated by Vaadin.
+-->
+
+<!-- default production bundle -->
+
+<html>
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    body, #outlet {
+      height: 100vh;
+      width: 100%;
+      margin: 0;
+    }
+  </style>
+  <!-- index.ts is included here automatically (either by the dev server or during the build) -->
+</head>
+<body>
+  <!-- This outlet div is where the views are rendered -->
+  <div id="outlet"></div>
+</body>
+</html>

flow-tests/test-express-build/test-parent-theme-prod/src/main/frontend/index.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!--
+This file is auto-generated by Vaadin.
+-->
+
+<!-- default production bundle -->
+
+<html>
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    body, #outlet {
+      height: 100vh;
+      width: 100%;
+      margin: 0;
+    }
+  </style>
+  <!-- index.ts is included here automatically (either by the dev server or during the build) -->
+</head>
+<body>
+  <!-- This outlet div is where the views are rendered -->
+  <div id="outlet"></div>
+</body>
+</html>

flow-tests/test-express-build/test-prod-bundle-no-plugin/src/main/frontend/index.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!--
+This file is auto-generated by Vaadin.
+-->
+
+<!-- default production bundle -->
+
+<html>
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    body, #outlet {
+      height: 100vh;
+      width: 100%;
+      margin: 0;
+    }
+  </style>
+  <!-- index.ts is included here automatically (either by the dev server or during the build) -->
+</head>
+<body>
+  <!-- This outlet div is where the views are rendered -->
+  <div id="outlet"></div>
+</body>
+</html>

flow-tests/test-express-build/test-theme-legacy-components-css-prod/src/main/frontend/index.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<!--
+This file is auto-generated by Vaadin.
+-->
+
+<!-- default production bundle -->
+
+<html>
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <style>
+    body, #outlet {
+      height: 100vh;
+      width: 100%;
+      margin: 0;
+    }
+  </style>
+  <!-- index.ts is included here automatically (either by the dev server or during the build) -->
+</head>
+<body>
+  <!-- This outlet div is where the views are rendered -->
+  <div id="outlet"></div>
+</body>
+</html>