CSP Subresource Integrity sri Hashes in checkout_index_index causes big loadingtimes and bytes in multistore and sriHashes vanish after Cache Flush

[stkrelax]

Preconditions and environment

• Magento version 2.4.5-p8
• loadingtimes increased from 400ms to 800ms
• bytes increased from 50kb to 500kb transmitted
• 27 Stores

Steps to reproduce

Since p8 sri hashes generation is active

Problem 1 all files for all stores are loaded and cause a 6,7 mb big hashmap Problem 2 after cache flush , hashmaps are not generated again and getting lost because save of hashmaps only happens after static deploy

Expected result

only hashmaps for the current store are expected to be generated only hashmaps for used theme are extecpted to be generated cache flush does not remove hashmap or generates them new

Actual result

all stores and themes are hashmapped causing it to be massivly big cache flush leads to empty hashes

Additional information

Vanish after Flush SubresourceIntegrityRepository

    /**
     * Loads integrity data from a storage.
     *
     * @return array
     */
    private function getData(): array
    {
        if ($this->data === null) {
            $cache = $this->cache->load($this->getCacheKey());

            $this->data = $cache ? $this->serializer->unserialize($cache) : []; <-- HERE
        }

        return $this->data;
    }

Release note

CSP Subresource Integrity Hashes generated storewise CSP Subresource Integrity Hashes wont vanish after cache flush

Triage and priority

• [ ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• [x] Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ ] Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

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[engcom-Hotel]

Hello @stkrelax,

Thanks for the report and collaboration!

We have referred to the Dev Docs related to Subresource Integrity and found the below:

So it seems this is an expected behavior, we need to run the bin/magento setup:static-content:deploy command to regenerate the hashes.

Let us know if we missed anything.

Thanks

[hostep]

It's not expected behavior, I'm sure this was not implemented with this in mind. People won't generate static assets after every cache flush, that's just ridiculous.

This needs to be refactored, so SRI hashes are generated once and keep being used even after multiple cache flushes. Storing those in cache, makes no sense whatsoever.

This was already discussed on Slack some months ago, it would surprise me if Adobe isn't already fixing this for one of the next releases.

[engcom-Hotel]

Thanks @hostep for the detailed explanations. We are confirming this issue for further processing.

Thanks

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.adobe.com/browse/AC-12858 is successfully created for this GitHub issue.

[m2-assistant[bot]]

:white_check_mark: Confirmed by @engcom-Hotel. Thank you for verifying the issue.
Issue Available: @engcom-Hotel, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[stkrelax]

@engcom-Hotel please also consider fixing:

Problem 1 all files for all stores are loaded and cause a 6,7 mb big hashmap

[qlhu]

Any update on this issue? When the code fix is going to be released?

[engcom-Hotel]

Hello @qlhu,

The priority for the issue was raised to P2. The JIRA status of this shows as Implementation but it is not assigned to any developer yet. It means that the issue still waiting for the developer(s) from Community Contributors or Adobe teams who start progress and propose PR with a fix.

Thanks

[dphilipps]

It's not expected behavior, I'm sure this was not implemented with this in mind. People won't generate static assets after every cache flush, that's just ridiculous.

This needs to be refactored, so SRI hashes are generated once and keep being used even after multiple cache flushes. Storing those in cache, makes no sense whatsoever.

This was already discussed on Slack some months ago, it would surprise me if Adobe isn't already fixing this for one of the next releases.

One workaround to prevent the hashes being flushed from cache, is to clear all the individual caches as follows (or do the same via admin). This leaves the cache entries with the INTEGRITY cache prefix intact. Just don't click the big orange button!

bin/magento cache:clean config layout block_html collections reflection db_ddl compiled_config eav customer_notification config_integration config_integration_api full_page config_webservice translate

[hostep]

Possibly fixed by: https://github.com/magento/magento2/commit/38501f017f24c4c4deb9bbbcfe2563fd51cf4341 ? At least the second problem from the report. Not sure about the first problem.