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[AssetMapper] Add integrity metadata to importmaps #60378

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MatTheCat
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@MatTheCat MatTheCat commented May 7, 2025

Q A
Branch? 7.3
Bug fix? no
New feature? yes
Deprecations? no
Issues Fix #60362
License MIT

Takes over #58722 because I missed it existed..!

@carsonbot carsonbot added this to the 7.3 milestone May 7, 2025
@MatTheCat MatTheCat force-pushed the ticket_60362 branch 2 times, most recently from 37d5d36 to 4648474 Compare May 13, 2025 12:22
@smnandre
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If you want to check, started some work was done here #58722

(and was waiting for people to step in and help, so really glad you did here 👍 )

@@ -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

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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.

->info('Array of algorithms used to compute importmap resources integrity.')
->beforeNormalization()->castToArray()->end()
->prototype('scalar')->end()
->defaultValue(['sha384'])
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Suggested change
->defaultValue(['sha384'])
->defaultNull()

This would be a BC break imho.

But it will also slow down the build time / memory usage.. so I do not think this is something that should be enabled per default (like cors)

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Makes sense; guess the recipe would be a good place to put this default then?

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[AssetMapper] Add integrity hashes to import maps
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