While currently a recovery link is only made available via the admin email address, this will be expanded in the future. In order to accomplish that, the mechanisms to store and validate recovery keys must support multiple keys to be valid at the same time.
This changeset adds that support, adding an additional token parameter which is part of a recovery link in addition to the key. A key itself is always associated with a token, so the two are only valid in combination. These associations are stored in a new `recovery_keys` option, which is regularly cleared in a new Cron hook, to prevent potential cluttering from unused recovery keys.
This changeset does not have any user-facing implications otherwise.
Props pbearne, timothyblynjacobs.
Fixes#46595. See #46130.
Built from https://develop.svn.wordpress.org/trunk@45211
git-svn-id: http://core.svn.wordpress.org/trunk@45020 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Using the new fatal handler introduced in [44962], an email is sent to the admin when a fatal error occurs. This email includes a secret link to enter recovery mode. When clicked, the link will be validated and on success a cookie will be placed on the client, enabling recovery mode for that user. This functionality is executed early before plugins and themes are loaded, in order to be unaffected by potential fatal errors these might be causing.
When in recovery mode, broken plugins and themes will be paused for that client, so that they are able to access the admin backend despite of these errors. They are notified about the broken extensions and the errors caused, and can then decide whether they would like to temporarily deactivate the extension or fix the problem and resume the extension.
A link in the admin bar allows the client to exit recovery mode.
Props timothyblynjacobs, afragen, flixos90, nerrad, miss_jwo, schlessera, spacedmonkey, swissspidy.
Fixes#46130, #44458.
Built from https://develop.svn.wordpress.org/trunk@44973
git-svn-id: http://core.svn.wordpress.org/trunk@44804 1a063a9b-81f0-0310-95a4-ce76da25c4cd
