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[AssetMapper] Add integrity metadata to importmaps #60378

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[AssetMapper] Add integrity metadata to importmaps #60378

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1 change: 1 addition & 0 deletions 1 src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
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Expand Up @@ -56,6 +56,7 @@ CHANGELOG
* Make `ValidatorCacheWarmer` use `kernel.build_dir` instead of `cache_dir`
* Make `SerializeCacheWarmer` use `kernel.build_dir` instead of `cache_dir`
* Support executing custom workflow validators during container compilation
* Add new `framework.asset_mapper.importmap_integrity_algorithms` option to add integrity metadata to importmaps

7.2
---
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7 changes: 7 additions & 0 deletions 7 src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
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Expand Up @@ -863,6 +863,7 @@ private function addAssetMapperSection(ArrayNodeDefinition $rootNode, callable $
->fixXmlConfig('excluded_pattern')
->fixXmlConfig('extension')
->fixXmlConfig('importmap_script_attribute')
->fixXmlConfig('importmap_integrity_algorithm')
->children()
// add array node called "paths" that will be an array of strings
->arrayNode('paths')
Expand Down Expand Up @@ -972,6 +973,12 @@ private function addAssetMapperSection(ArrayNodeDefinition $rootNode, callable $
->end()
->end()
->end()
->arrayNode('importmap_integrity_algorithms')
->info('Array of algorithms used to compute importmap resources integrity.')
->beforeNormalization()->castToArray()->end()
->prototype('scalar')->end()
->defaultValue([])
->end()
->end()
->end()
->end()
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1 change: 1 addition & 0 deletions 1 src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
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Expand Up @@ -1482,6 +1482,7 @@ private function registerAssetMapperConfiguration(array $config, ContainerBuilde
$container
->getDefinition('asset_mapper.mapped_asset_factory')
->replaceArgument(2, $config['vendor_dir'])
->setArgument(3, $config['importmap_integrity_algorithms'])
;

$container
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1 change: 1 addition & 0 deletions 1 src/Symfony/Bundle/FrameworkBundle/Resources/config/asset_mapper.php
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Expand Up @@ -67,6 +67,7 @@
service('asset_mapper.public_assets_path_resolver'),
service('asset_mapper_compiler'),
abstract_arg('vendor directory'),
abstract_arg('integrity hash algorithms'),
])

->set('asset_mapper.cached_mapped_asset_factory', CachedMappedAssetFactory::class)
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1 change: 1 addition & 0 deletions 1 src/Symfony/Bundle/FrameworkBundle/Resources/config/schema/symfony-1.0.xsd
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Expand Up @@ -208,6 +208,7 @@
<xsd:element name="extension" type="asset_mapper_extension" minOccurs="0" maxOccurs="unbounded" />
<xsd:element name="importmap-script-attribute" type="asset_mapper_attribute" minOccurs="0" maxOccurs="unbounded" />
<xsd:element name="precompress" type="asset_mapper_precompress" minOccurs="0" maxOccurs="1" />
<xsd:element name="importmap-integrity-algorithm" type="xsd:string" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
<xsd:attribute name="enabled" type="xsd:boolean" />
<xsd:attribute name="exclude-dotfiles" type="xsd:boolean" />
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2 changes: 2 additions & 0 deletions 2 src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
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Expand Up @@ -148,6 +148,7 @@ public function testAssetMapperCanBeEnabled()
'formats' => [],
'extensions' => interface_exists(CompressorInterface::class) ? CompressorInterface::DEFAULT_EXTENSIONS : [],
],
'importmap_integrity_algorithms' => [],
];

$this->assertEquals($defaultConfig, $config['asset_mapper']);
Expand Down Expand Up @@ -877,6 +878,7 @@ protected static function getBundleDefaultConfig()
'formats' => [],
'extensions' => interface_exists(CompressorInterface::class) ? CompressorInterface::DEFAULT_EXTENSIONS : [],
],
'importmap_integrity_algorithms' => [],
],
'cache' => [
'pools' => [],
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1 change: 1 addition & 0 deletions 1 src/Symfony/Component/AssetMapper/CHANGELOG.md
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Expand Up @@ -7,6 +7,7 @@ CHANGELOG
* Add support for pre-compressing assets with Brotli, Zstandard, Zopfli, and gzip
* Add option `--dry-run` to `importmap:require` command
* `ImportMapRequireCommand` now takes `projectDir` as a required third constructor argument
* Add integrity metadata to importmaps

7.2
---
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23 changes: 23 additions & 0 deletions 23 src/Symfony/Component/AssetMapper/Factory/MappedAssetFactory.php
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Expand Up @@ -13,6 +13,7 @@

use Symfony\Component\AssetMapper\AssetMapperCompiler;
use Symfony\Component\AssetMapper\Exception\CircularAssetsException;
use Symfony\Component\AssetMapper\Exception\LogicException;
use Symfony\Component\AssetMapper\Exception\RuntimeException;
use Symfony\Component\AssetMapper\MappedAsset;
use Symfony\Component\AssetMapper\Path\PublicAssetsPathResolverInterface;
Expand All @@ -25,6 +26,7 @@ class MappedAssetFactory implements MappedAssetFactoryInterface
{
private const PREDIGESTED_REGEX = '/-([0-9a-zA-Z]{7,128}\.digested)/';
private const PUBLIC_DIGEST_LENGTH = 7;
private const INTEGRITY_HASH_ALGORITHMS = ['sha256', 'sha384', 'sha512'];
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Do we really need multiple algorithms ?

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@MatTheCat MatTheCat May 17, 2025 •
edited
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I think so: it’s required to support https://w3c.github.io/webappsec-subresource-integrity/#agility, and people apparently don’t agree on what the default algorithm should be.


private array $assetsCache = [];
private array $assetsBeingCreated = [];
Expand All @@ -33,7 +35,11 @@ public function __construct(
private readonly PublicAssetsPathResolverInterface $assetsPathResolver,
private readonly AssetMapperCompiler $compiler,
private readonly string $vendorDir,
private readonly array $integrityHashAlgorithms = [],
) {
if ($unsupportedAlgorithms = array_diff($this->integrityHashAlgorithms, self::INTEGRITY_HASH_ALGORITHMS)) {
throw new LogicException(sprintf('Unsupported "%s" algorithm(s). Supported ones are "%s".', implode('", "', $unsupportedAlgorithms), implode('", "', self::INTEGRITY_HASH_ALGORITHMS)));
}
}

public function createMappedAsset(string $logicalPath, string $sourcePath): ?MappedAsset
Expand Down Expand Up @@ -63,6 +69,7 @@ public function createMappedAsset(string $logicalPath, string $sourcePath): ?Map
$asset->getDependencies(),
$asset->getFileDependencies(),
$asset->getJavaScriptImports(),
$this->getIntegrity($asset, $content),
);

$this->assetsCache[$logicalPath] = $asset;
Expand Down Expand Up @@ -131,4 +138,20 @@ private function isVendor(string $sourcePath): bool

return $sourcePath && $vendorDir && str_starts_with($sourcePath, $vendorDir);
}

private function getIntegrity(MappedAsset $asset, ?string $content): ?string
{
$integrity = null;

foreach ($this->integrityHashAlgorithms as $algorithm) {
$hash = null !== $content
? hash($algorithm, $content, true)
: hash_file($algorithm, $asset->sourcePath, true)
;

$integrity .= \sprintf('%s%s-%s', $integrity ? ' ' : '', $algorithm, base64_encode($hash));
}

return $integrity;
}
}
11 changes: 6 additions & 5 deletions 11 src/Symfony/Component/AssetMapper/ImportMap/ImportMapGenerator.php
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Expand Up @@ -50,7 +50,7 @@ public function getEntrypointNames(): array
/**
* @param string[] $entrypointNames
*
* @return array<string, array{path: string, type: string, preload?: bool}>
* @return array<string, array{path: string, type: string, integrity?: string, preload?: bool}>
*
* @internal
*/
Expand Down Expand Up @@ -83,7 +83,7 @@ public function getImportMapData(array $entrypointNames): array
/**
* @internal
*
* @return array<string, array{path: string, type: string}>
* @return array<string, array{path: string, type: string, integrity?: string}>
*/
public function getRawImportMapData(): array
{
Expand All @@ -104,9 +104,10 @@ public function getRawImportMapData(): array
throw $this->createMissingImportMapAssetException($entry);
}

$path = $asset->publicPath;
$data = ['path' => $path, 'type' => $entry->type->value];
$rawImportMapData[$entry->importName] = $data;
$rawImportMapData[$entry->importName] = ['path' => $asset->publicPath, 'type' => $entry->type->value];
if ($asset->integrity) {
$rawImportMapData[$entry->importName]['integrity'] = $asset->integrity;
}
}

return $rawImportMapData;
Expand Down
7 changes: 6 additions & 1 deletion 7 src/Symfony/Component/AssetMapper/ImportMap/ImportMapRenderer.php
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Expand Up @@ -49,6 +49,7 @@ public function render(string|array $entryPoint, array $attributes = []): string
$importMap = [];
$modulePreloads = [];
$cssLinks = [];
$integrity = [];
$polyfillPath = null;
foreach ($importMapData as $importName => $data) {
$path = $data['path'];
Expand All @@ -70,8 +71,12 @@ public function render(string|array $entryPoint, array $attributes = []): string
}

$preload = $data['preload'] ?? false;
$assetIntegrity = $data['integrity'] ?? false;
if ('css' !== $data['type']) {
$importMap[$importName] = $path;
if ($assetIntegrity) {
$integrity[$path] = $assetIntegrity;
}
if ($preload) {
$modulePreloads[] = $path;
}
Expand All @@ -96,7 +101,7 @@ public function render(string|array $entryPoint, array $attributes = []): string
}

$scriptAttributes = $attributes || $this->scriptAttributes ? ' '.$this->createAttributesString($attributes) : '';
$importMapJson = json_encode(['imports' => $importMap], \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_HEX_TAG);
$importMapJson = json_encode(['imports' => $importMap, ...$integrity ? ['integrity' => $integrity] : []], \JSON_THROW_ON_ERROR | \JSON_PRETTY_PRINT | \JSON_UNESCAPED_SLASHES | \JSON_HEX_TAG);
$output .= <<<HTML

<script type="importmap"$scriptAttributes>
Expand Down
1 change: 1 addition & 0 deletions 1 src/Symfony/Component/AssetMapper/MappedAsset.php
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Expand Up @@ -52,6 +52,7 @@ public function __construct(
private array $dependencies = [],
private array $fileDependencies = [],
private array $javaScriptImports = [],
public ?string $integrity = null,
) {
if (null !== $sourcePath) {
$this->sourcePath = $sourcePath;
Expand Down
32 changes: 31 additions & 1 deletion 32 src/Symfony/Component/AssetMapper/Tests/Factory/MappedAssetFactoryTest.php
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Expand Up @@ -19,6 +19,7 @@
use Symfony\Component\AssetMapper\Compiler\CssAssetUrlCompiler;
use Symfony\Component\AssetMapper\Compiler\JavaScriptImportPathCompiler;
use Symfony\Component\AssetMapper\Exception\CircularAssetsException;
use Symfony\Component\AssetMapper\Exception\LogicException;
use Symfony\Component\AssetMapper\Factory\MappedAssetFactory;
use Symfony\Component\AssetMapper\ImportMap\ImportMapConfigReader;
use Symfony\Component\AssetMapper\MappedAsset;
Expand Down Expand Up @@ -148,7 +149,35 @@ public function testCreateMappedAssetInMissingVendor()
$this->assertFalse($asset->isVendor);
}

private function createFactory(?AssetCompilerInterface $extraCompiler = null, ?string $vendorDir = self::VENDOR_FIXTURES_DIR): MappedAssetFactory
public function testCreateMappedAssetWithoutIntegrity()
{
$factory = $this->createFactory();
$asset = $factory->createMappedAsset('file2.js', self::FIXTURES_DIR.'/dir1/file2.js');
$this->assertNull($asset->integrity);
}

public function testCreateMappedAssetWithOneIntegrityAlgorithm()
{
$factory = $this->createFactory(integrityHashAlgorithms: ['sha256']);
$asset = $factory->createMappedAsset('file2.js', self::FIXTURES_DIR.'/dir1/file2.js');
$this->assertSame('sha256-b8bze+0OP5qLVVEG0aUh25UkvNjZXLeugH9Jg7MvSz8=', $asset->integrity);
}

public function testCreateMappedAssetWithManyIntegrityAlgorithms()
{
$factory = $this->createFactory(integrityHashAlgorithms: ['sha256', 'sha384']);
$asset = $factory->createMappedAsset('file2.js', self::FIXTURES_DIR.'/dir1/file2.js');
$this->assertSame('sha256-b8bze+0OP5qLVVEG0aUh25UkvNjZXLeugH9Jg7MvSz8= sha384-2cpbxkWC8I4PKAhlQ+LaFmVek6qd8w35xUZ+QRGMzcSvX9SP2EgjLvKSawSmS9J7', $asset->integrity);
}

public function testCreateMappedAssetWithInvalidIntegrityAlgorithm()
{
$this->expectException(LogicException::class);
$this->expectExceptionMessage('Unsupported "sha1" algorithm(s). Supported ones are "sha256", "sha384", "sha512".');
$this->createFactory(integrityHashAlgorithms: ['sha1']);
}

private function createFactory(?AssetCompilerInterface $extraCompiler = null, ?string $vendorDir = self::VENDOR_FIXTURES_DIR, array $integrityHashAlgorithms = []): MappedAssetFactory
{
$compilers = [
new JavaScriptImportPathCompiler($this->createMock(ImportMapConfigReader::class)),
Expand All @@ -174,6 +203,7 @@ private function createFactory(?AssetCompilerInterface $extraCompiler = null, ?s
$pathResolver,
$compiler,
$vendorDir,
$integrityHashAlgorithms,
);

// mock the AssetMapper to behave like normal: by calling back to the factory
Expand Down
43 changes: 43 additions & 0 deletions 43 src/Symfony/Component/AssetMapper/Tests/ImportMap/ImportMapGeneratorTest.php
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Expand Up @@ -92,6 +92,10 @@ public function testGetImportMapData()
path: 'styles/never_imported_css.css',
type: ImportMapType::CSS,
),
self::createLocalEntry(
'js_file_with_integrity',
path: 'js_file_with_integrity.js',
),
]);

$importedFile1 = new MappedAsset(
Expand Down Expand Up @@ -142,6 +146,13 @@ public function testGetImportMapData()
publicPathWithoutDigest: '/assets/styles/never_imported_css.css',
publicPath: '/assets/styles/never_imported_css-d1g35t.css',
);
$jsFileWithIntegrity = new MappedAsset(
'js_file_with_integrity.js',
'/path/to/js_file_with_integrity.js',
publicPathWithoutDigest: '/assets/js_file_with_integrity.js',
publicPath: '/assets/js_file_with_integrity-d1g35t.js',
integrity: 'sha384-base64-hash'
);
$this->mockAssetMapper([
new MappedAsset(
'entry1.js',
Expand Down Expand Up @@ -179,6 +190,7 @@ public function testGetImportMapData()
$importedCss2,
$importedCssInImportmap,
$neverImportedCss,
$jsFileWithIntegrity,
]);

$actualImportMapData = $manager->getImportMapData(['entry2', 'entry1']);
Expand Down Expand Up @@ -232,6 +244,11 @@ public function testGetImportMapData()
'path' => '/assets/styles/never_imported_css-d1g35t.css',
'type' => 'css',
],
'js_file_with_integrity' => [
'path' => '/assets/js_file_with_integrity-d1g35t.js',
'type' => 'js',
'integrity' => 'sha384-base64-hash',
],
], $actualImportMapData);

// now check the order
Expand All @@ -251,6 +268,7 @@ public function testGetImportMapData()
// importmap entries never imported
'entry3',
'never_imported_css',
'js_file_with_integrity',
], array_keys($actualImportMapData));
}

Expand Down Expand Up @@ -570,6 +588,31 @@ public static function getRawImportMapDataTests(): iterable
],
],
];

yield 'it adds integrity when it exists' => [
[
self::createLocalEntry(
'app',
path: './assets/app.js',
),
],
[
new MappedAsset(
'app.js',
// /fake/root is the mocked root directory
'/fake/root/assets/app.js',
publicPath: '/assets/app-d1g3st.js',
integrity: 'sha384-base64-hash',
),
],
[
'app' => [
'path' => '/assets/app-d1g3st.js',
'type' => 'js',
'integrity' => 'sha384-base64-hash',
],
],
];
}

public function testGetRawImportDataUsesCacheFile()
Expand Down
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