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Introduce an expanded meta registration API.

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`register_meta()` has been altered to accept an array of arguments as the third parameter in order to support its usage beyond XML-RPC, notably in the REST API and other projects that may build on top of meta, such as a potential Fields API. Arguments are whitelisted to reserve the right for core to add more later.

New functions added to complement this expansion are:
* `registered_meta_key_exists()`
* `unregister_meta_key()`
* `get_registered_meta_keys()`
* `get_registered_metadata()`
* A "private" function for the aforementioned whitelisting.

There still need to be lots of tests written for previous and new behaviors, and many things are subject to change. Maybe things will explode. #yolo

props jeremyfelt, ericlewis, sc0ttkclark, helen, rmccue, ocean90, voldemortensen.
see #35658.

Built from https://develop.svn.wordpress.org/trunk@37924


git-svn-id: http://core.svn.wordpress.org/trunk@37865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Helen Hou-Sandí
2016-06-30 01:02:29 +00:00
parent 0358e2f4b8
commit 69ccab3405
4 changed files with 340 additions and 28 deletions
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22
wp-includes/capabilities.php
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@@ -243,11 +243,13 @@ function map_meta_cap( $cap, $user_id ) {
break;
}
$post_type = get_post_type( $post );
$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
$meta_key = isset( $args[ 1 ] ) ? $args[ 1 ] : false;
if ( $meta_key && has_filter( "auth_post_meta_{$meta_key}" ) ) {
if ( $meta_key && ( has_filter( "auth_post_meta_{$meta_key}" ) || has_filter( "auth_post_{$post_type}_meta_{$meta_key}" ) ) ) {
/**
* Filters whether the user is allowed to add post meta to a post.
*
@@ -264,6 +266,24 @@ function map_meta_cap( $cap, $user_id ) {
* @param array $caps User capabilities.
*/
$allowed = apply_filters( "auth_post_meta_{$meta_key}", false, $meta_key, $post->ID, $user_id, $cap, $caps );
/**
* Filters whether the user is allowed to add post meta to a post of a given type.
*
* The dynamic portions of the hook name, `$meta_key` and `$post_type`,
* refer to the meta key passed to map_meta_cap() and the post type, respectively.
*
* @since 4.6.0
*
* @param bool $allowed Whether the user can add the post meta. Default false.
* @param string $meta_key The meta key.
* @param int $post_id Post ID.
* @param int $user_id User ID.
* @param string $cap Capability name.
* @param array $caps User capabilities.
*/
$allowed = apply_filters( "auth_post_{$post_type}_meta_{$meta_key}", $allowed, $meta_key, $post->ID, $user_id, $cap, $caps );
if ( ! $allowed )
$caps[] = $cap;
} elseif ( $meta_key && is_protected_meta( $meta_key, 'post' ) ) {