feat(core): allow domain sharding

[rexxars]

Description

This is the studio integration side of sanity-io/client#860 - see that PR for rationale.
I'll rebase/change this PR to use a regular release of the client once the above is merged and released.

The implementation works like this:

• We first configure and do the auth check/login on the unsharded domain. This ensures we have the right redirect URLs and such.
• Once authenticated, we fetch the current user at the same time as we do a network check against the /ping route.
  • The ping route allows exposed network timing information (through a Timing-Allow-Origin header), which allows us to get the HTTP protocol used to access it.
  • If we detect HTTP2/3, we still use unsharded domains.
  • If the request used HTTP1, or we cannot determine the protocol (eg if the resource timing API is not available), we switch the client to sharded domains.

This is only enabled for customers with allowDomainSharding set to true, as well as the auth.loginMethod set to token. This is unfortunate, but we cannot get the auth cookie set on the regular project hostname propagated, so we have to use tokens. This does introduce overhead, since all requests will have preflight requests.

Note that this is a temporary workaround, while we work on a more permanent solution.

What to review

Either disable HTTP2/3 support (through browser flag or similar), or set FORCE_DOMAIN_SHARDING to true in createAuthStore and observe domain sharding behavior in staging. Setting the FORCE_DOMAIN_SHARDING flag back to false (or re-enabling HTTP2/3) and observe that it does not use domain sharding.

Testing

I realize this is missing tests. Since this is a temporary workaround, I find this acceptable for now. But if you feel strongly, shout out.

Notes for release

None. This is a silent release - we only want select customers to use this as a workaround, not a permanent solution.

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[github-actions]

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[github-actions]

Component Testing Report Updated Jul 2, 2024 10:58 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	37s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	7s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	28s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	32s	11	7	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	14s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	29s	4	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	37s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 18s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 6s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	7s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	21s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	15s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	1m 6s	21	0	0
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	1m 22s	27	0	0