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<?php
/**
* Table Checksums Class.
*
* @package automattic/jetpack-sync
*/
namespace Automattic\Jetpack\Sync\Replicastore;
use Automattic\Jetpack\Connection\Manager;
use Automattic\Jetpack\Sync;
use Automattic\Jetpack\Sync\Modules;
use WP_Error;
use WP_User_Query;
/**
* Class to handle Table Checksums for the User Meta table.
*/
class Table_Checksum_Usermeta extends Table_Checksum_Users {
/**
* Calculate the checksum based on provided range and filters.
*
* @param int|null $range_from The start of the range.
* @param int|null $range_to The end of the range.
* @param array|null $filter_values Additional filter values. Not used at the moment.
* @param bool $granular_result If the returned result should be granular or only the checksum.
* @param bool $simple_return_value If we want to use a simple return value for non-granular results (return only the checksum, without wrappers).
*
* @return array|mixed|object|WP_Error|null
*/
public function calculate_checksum( $range_from = null, $range_to = null, $filter_values = null, $granular_result = false, $simple_return_value = true ) {
if ( ! Sync\Settings::is_checksum_enabled() ) {
return new WP_Error( 'checksum_disabled', 'Checksums are currently disabled.' );
}
/**
* First we need to fetch the user IDs for the users that we want to include in the range.
*
* To keep things a bit simple and avoid filtering issues, let's reuse the `build_filter_statement` that already
* exists. Unfortunately we don't
*/
global $wpdb;
// This call depends on the `range_field` pointing to the `ID` field of the `users` table. Currently, "ID".
$range_filter_statement = $this->build_filter_statement( $range_from, $range_to );
$query = "
SELECT
DISTINCT {$this->table}.{$this->range_field}
FROM
{$this->table}
JOIN {$wpdb->usermeta} as um_table ON um_table.user_id = {$this->table}.ID
WHERE
{$range_filter_statement}
AND um_table.meta_key = '{$wpdb->prefix}user_level'
AND um_table.meta_value > 0
";
// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
$user_ids = $wpdb->get_col( $query );
// Chunk the array down to make sure we don't overload the database with queries that are too large.
$chunked_user_ids = array_chunk( $user_ids, 500 );
$checksum_entries = array();
foreach ( $chunked_user_ids as $user_ids_chunk ) {
$user_objects = $this->get_user_objects_by_ids( $user_ids_chunk );
foreach ( $user_objects as $user_object ) {
// expand and sanitize desired meta based on WP.com logic.
$user_object = $this->expand_and_sanitize_user_meta( $user_object );
// Generate checksum entry based on the serialized value if not empty.
$checksum_entry = 0;
if ( ! empty( $user_object->roles ) ) {
$checksum_entry = crc32( implode( '#', array( $this->salt, 'roles', maybe_serialize( $user_object->roles ) ) ) );
}
// Meta only persisted if user is connected to WP.com.
if ( ( new Manager( 'jetpack' ) )->is_user_connected( $user_object->ID ) ) {
if ( ! empty( $user_object->allcaps ) ) {
$checksum_entry += crc32(
implode(
'#',
array(
$this->salt,
'capabilities',
maybe_serialize( $user_object->allcaps ),
)
)
);
}
// Explicitly check that locale is not same as site locale.
if ( ! empty( $user_object->locale ) && get_locale() !== $user_object->locale ) {
$checksum_entry += crc32(
implode(
'#',
array(
$this->salt,
'locale',
maybe_serialize( $user_object->locale ),
)
)
);
}
if ( ! empty( $user_object->allowed_mime_types ) ) {
$checksum_entry += crc32(
implode(
'#',
array(
$this->salt,
'allowed_mime_types',
maybe_serialize( $user_object->allowed_mime_types ),
)
)
);
}
}
$checksum_entries[ $user_object->ID ] = '' . $checksum_entry;
}
}
// Non-granular results need only to sum the different entries.
if ( ! $granular_result ) {
$checksum_sum = 0;
foreach ( $checksum_entries as $entry ) {
$checksum_sum += intval( $entry );
}
if ( $simple_return_value ) {
return '' . $checksum_sum;
}
return array(
'range' => $range_from . '-' . $range_to,
'checksum' => '' . $checksum_sum,
);
}
// Granular results.
$response = $checksum_entries;
// Sort the return value for easier comparisons and code flows further down the line.
ksort( $response );
return $response;
}
/**
* Expand the User Object with additional meta santized by WP.com logic.
*
* @param mixed $user_object User Object from WP_User_Query.
*
* @return mixed $user_object expanded User Object.
*/
protected function expand_and_sanitize_user_meta( $user_object ) {
$user_module = Modules::get_module( 'users' );
// Expand User Objects based on Sync logic.
$user_object = $user_module->expand_user( $user_object );
// Sanitize location.
if ( ! empty( $user_object->locale ) ) {
$user_object->locale = wp_strip_all_tags( $user_object->locale, true );
}
// Sanitize allcaps.
if ( ! empty( $user_object->allcaps ) ) {
$user_object->allcaps = array_map(
function ( $cap ) {
return (bool) $cap;
},
$user_object->allcaps
);
}
// Sanitize allowed_mime_types.
$allowed_mime_types = $user_object->allowed_mime_types;
foreach ( $allowed_mime_types as $allowed_mime_type_short => $allowed_mime_type_long ) {
$allowed_mime_type_short = wp_strip_all_tags( (string) $allowed_mime_type_short, true );
$allowed_mime_type_long = wp_strip_all_tags( (string) $allowed_mime_type_long, true );
$allowed_mime_types[ $allowed_mime_type_short ] = $allowed_mime_type_long;
}
$user_object->allowed_mime_types = $allowed_mime_types;
// Sanitize roles.
if ( is_array( $user_object->roles ) ) {
$user_object->roles = array_map( 'sanitize_text_field', $user_object->roles );
}
return $user_object;
}
/**
* Gets a list of `WP_User` objects by their IDs
*
* @param array $ids List of IDs to fetch.
*
* @return array
*/
protected function get_user_objects_by_ids( $ids ) {
$user_query = new WP_User_Query( array( 'include' => $ids ) );
return $user_query->get_results();
}
}
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