fix(core): definition of cookie name validate

[StarlightIbuki]

Summary

We have a too strong limitation on the character used in cookie names. For example "." should be allowed.

We choose not to do the same to the header because we rely on Nginx's API to handle headers, which has more strict restrictions on the characters.

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md

Full changelog

• [Implement ...]

Issue reference

Fix #11860

[bungle]

This regex looks simpler (and whitelist feels safer than blacklist):
https://github.com/guzzle/guzzle/blob/7.9/src/Cookie/SetCookie.php#L464

@StarlightIbuki what do you think?

[StarlightIbuki]

This regex looks simpler (and whitelist feels safer than blacklist): guzzle/guzzle@7.9/src/Cookie/SetCookie.php#L464

@StarlightIbuki what do you think?

Applied the change. And notice the code you refer to also uses a blacklist.

[hanshuebner]

Typo, otherwise looks good to me.

[bungle]

Applied the change. And notice the code you refer to also uses a blacklist.

Ah, damn, you are right. I read it wrong.

[kikito]

If the function is only used here, please remove it from utils and into typedefs.lua

[StarlightIbuki]

It's unit-tested so it needs to be exported. Also before the patch, this function was already exported and in the util module.

[StarlightIbuki]

@hanshuebner Could you review this again?

[team-gateway-bot]

Cherry-pick failed for master, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git remote add upstream https://github.com/kong/kong-ee
git fetch upstream master
git worktree add -d .worktree/cherry-pick-11881-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-11881-to-master-to-upstream
git checkout -b cherry-pick-11881-to-master-to-upstream
ancref=$(git merge-base 5f34a49edc356b798f25a340522d8efe2c4f5d95 8b88a976268f1c211962b309c9017e9d8b291883)
git cherry-pick -x $ancref..8b88a976268f1c211962b309c9017e9d8b291883