Sergey Biryukov edd85686c4 Themes: Add support for Update URI header.
This allows third-party themes to avoid accidentally being overwritten with an update of a theme of a similar name from the WordPress.org Theme Directory.

Additionally, introduce the `update_themes_{$hostname}` filter, which third-party themes can use to offer updates for a given hostname.

If set, the `Update URI` header field should be a URI and have a unique hostname.

Some examples include:

* `https://wordpress.org/themes/example-theme/`
* `https://example.com/my-theme/`
* `my-custom-theme-name`

`Update URI: false` also works, and unless there is code handling the `false` hostname, the theme will never get an update notification.

If the header is present, the WordPress.org API will currently only return updates for the theme if it matches the following format:

* `https://wordpress.org/themes/{$slug}/`
* `w.org/theme/{$slug}`

If the header has any other value, the API will not return a result and will ignore the theme for update purposes.

Follow-up to [50921].

Props dd32, meloniq, costdev, audrasjb, DavidAnderson, markjaquith, DrewAPicture, mweichert, design_dolphin, filosofo, sean212, nhuja, JeroenReumkens, infolu, dingdang, joyously, earnjam, williampatton, grapplerulrich, markparnell, apedog, afragen, miqrogroove, rmccue, crazycoders, jdgrimes, damonganto, joostdevalk, jorbin, georgestephanis, khromov, GeekStreetWP, jb510, Rarst, juliobox, Ipstenu, mikejolley, Otto42, gMagicScott, TJNowell, GaryJ, knutsp, mordauk, nvartolomei, aspexi, chriscct7, benoitchantre, ryno267, lev0, gregorlove, dougwollison, leemon, SergeyBiryukov.
See #14179, #23318, #32101.

git-svn-id: https://develop.svn.wordpress.org/trunk@53933 602fd350-edb4-49c9-b593-d223f7449a82
2022-08-23 17:46:46 +00:00
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