, __( 'Nicename may not be longer than 50 characters.' ) );
	}

	$user_nicename_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND user_login != %s LIMIT 1", $user_nicename, $user_login ) );

	if ( $user_nicename_check ) {
		$suffix = 2;
		while ( $user_nicename_check ) {
			// user_nicename allows 50 chars. Subtract one for a hyphen, plus the length of the suffix.
			$base_length         = 49 - mb_strlen( $suffix );
			$alt_user_nicename   = mb_substr( $user_nicename, 0, $base_length ) . "-$suffix";
			$user_nicename_check = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->users WHERE user_nicename = %s AND user_login != %s LIMIT 1", $alt_user_nicename, $user_login ) );
			++$suffix;
		}
		$user_nicename = $alt_user_nicename;
	}

	$raw_user_email = empty( $userdata['user_email'] ) ? '' : $userdata['user_email'];

	/**
	 * Filters a user's email before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $raw_user_email The user's email.
	 */
	$user_email = apply_filters( 'pre_user_email', $raw_user_email );

	/*
	 * If there is no update, just check for `email_exists`. If there is an update,
	 * check if current email and new email are the same, and check `email_exists`
	 * accordingly.
	 */
	if ( ( ! $update || ( ! empty( $old_user_data ) && 0 !== strcasecmp( $user_email, $old_user_data->user_email ) ) )
		&& ! defined( 'WP_IMPORTING' )
		&& email_exists( $user_email )
	) {
		return new WP_Error( 'existing_user_email', __( 'Sorry, that email address is already used!' ) );
	}

	$raw_user_url = empty( $userdata['user_url'] ) ? '' : $userdata['user_url'];

	/**
	 * Filters a user's URL before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $raw_user_url The user's URL.
	 */
	$user_url = apply_filters( 'pre_user_url', $raw_user_url );

	if ( mb_strlen( $user_url ) > 100 ) {
		return new WP_Error( 'user_url_too_long', __( 'User URL may not be longer than 100 characters.' ) );
	}

	$user_registered = empty( $userdata['user_registered'] ) ? gmdate( 'Y-m-d H:i:s' ) : $userdata['user_registered'];

	$user_activation_key = empty( $userdata['user_activation_key'] ) ? '' : $userdata['user_activation_key'];

	if ( ! empty( $userdata['spam'] ) && ! is_multisite() ) {
		return new WP_Error( 'no_spam', __( 'Sorry, marking a user as spam is only supported on Multisite.' ) );
	}

	$spam = empty( $userdata['spam'] ) ? 0 : (bool) $userdata['spam'];

	// Store values to save in user meta.
	$meta = array();

	$nickname = empty( $userdata['nickname'] ) ? $user_login : $userdata['nickname'];

	/**
	 * Filters a user's nickname before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $nickname The user's nickname.
	 */
	$meta['nickname'] = apply_filters( 'pre_user_nickname', $nickname );

	$first_name = empty( $userdata['first_name'] ) ? '' : $userdata['first_name'];

	/**
	 * Filters a user's first name before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $first_name The user's first name.
	 */
	$meta['first_name'] = apply_filters( 'pre_user_first_name', $first_name );

	$last_name = empty( $userdata['last_name'] ) ? '' : $userdata['last_name'];

	/**
	 * Filters a user's last name before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $last_name The user's last name.
	 */
	$meta['last_name'] = apply_filters( 'pre_user_last_name', $last_name );

	if ( empty( $userdata['display_name'] ) ) {
		if ( $update ) {
			$display_name = $user_login;
		} elseif ( $meta['first_name'] && $meta['last_name'] ) {
			$display_name = sprintf(
				/* translators: 1: User's first name, 2: Last name. */
				_x( '%1$s %2$s', 'Display name based on first name and last name' ),
				$meta['first_name'],
				$meta['last_name']
			);
		} elseif ( $meta['first_name'] ) {
			$display_name = $meta['first_name'];
		} elseif ( $meta['last_name'] ) {
			$display_name = $meta['last_name'];
		} else {
			$display_name = $user_login;
		}
	} else {
		$display_name = $userdata['display_name'];
	}

	/**
	 * Filters a user's display name before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $display_name The user's display name.
	 */
	$display_name = apply_filters( 'pre_user_display_name', $display_name );

	$description = empty( $userdata['description'] ) ? '' : $userdata['description'];

	/**
	 * Filters a user's description before the user is created or updated.
	 *
	 * @since 2.0.3
	 *
	 * @param string $description The user's description.
	 */
	$meta['description'] = apply_filters( 'pre_user_description', $description );

	$meta['rich_editing'] = empty( $userdata['rich_editing'] ) ? 'true' : $userdata['rich_editing'];

	$meta['syntax_highlighting'] = empty( $userdata['syntax_highlighting'] ) ? 'true' : $userdata['syntax_highlighting'];

	$meta['comment_shortcuts'] = empty( $userdata['comment_shortcuts'] ) || 'false' === $userdata['comment_shortcuts'] ? 'false' : 'true';

	$admin_color         = empty( $userdata['admin_color'] ) ? 'fresh' : $userdata['admin_color'];
	$meta['admin_color'] = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $admin_color );

	$meta['use_ssl'] = empty( $userdata['use_ssl'] ) ? 0 : (bool) $userdata['use_ssl'];

	$meta['show_admin_bar_front'] = empty( $userdata['show_admin_bar_front'] ) ? 'true' : $userdata['show_admin_bar_front'];

	$meta['locale'] = isset( $userdata['locale'] ) ? $userdata['locale'] : '';

	$compacted = compact( 'user_pass', 'user_nicename', 'user_email', 'user_url', 'user_registered', 'user_activation_key', 'display_name' );
	$data      = wp_unslash( $compacted );

	if ( ! $update ) {
		$data = $data + compact( 'user_login' );
	}

	if ( is_multisite() ) {
		$data = $data + compact( 'spam' );
	}

	/**
	 * Filters user data before the record is created or updated.
	 *
	 * It only includes data in the users table, not any user metadata.
	 *
	 * @since 4.9.0
	 * @since 5.8.0 The `$userdata` parameter was added.
	 *
	 * @param array    $data {
	 *     Values and keys for the user.
	 *
	 *     @type string $user_login      The user's login. Only included if $update == false
	 *     @type string $user_pass       The user's password.
	 *     @type string $user_email      The user's email.
	 *     @type string $user_url        The user's url.
	 *     @type string $user_nicename   The user's nice name. Defaults to a URL-safe version of user's login
	 *     @type string $display_name    The user's display name.
	 *     @type string $user_registered MySQL timestamp describing the moment when the user registered. Defaults to
	 *                                   the current UTC timestamp.
	 * }
	 * @param bool     $update   Whether the user is being updated rather than created.
	 * @param int|null $user_id  ID of the user to be updated, or NULL if the user is being created.
	 * @param array    $userdata The raw array of data passed to wp_insert_user().
	 */
	$data = apply_filters( 'wp_pre_insert_user_data', $data, $update, ( $update ? $user_id : null ), $userdata );

	if ( empty( $data ) || ! is_array( $data ) ) {
		return new WP_Error( 'empty_data', __( 'Not enough data to create this user.' ) );
	}

	if ( $update ) {
		if ( $user_email !== $old_user_data->user_email || $user_pass !== $old_user_data->user_pass ) {
			$data['user_activation_key'] = '';
		}
		$wpdb->update( $wpdb->users, $data, array( 'ID' => $user_id ) );
	} else {
		$wpdb->insert( $wpdb->users, $data );
		$user_id = (int) $wpdb->insert_id;
	}

	$user = new WP_User( $user_id );

	/**
	 * Filters a user's meta values and keys immediately after the user is created or updated
	 * and before any user meta is inserted or updated.
	 *
	 * Does not include contact methods. These are added using `wp_get_user_contact_methods( $user )`.
	 *
	 * For custom meta fields, see the {@see 'insert_custom_user_meta'} filter.
	 *
	 * @since 4.4.0
	 * @since 5.8.0 The `$userdata` parameter was added.
	 *
	 * @param array $meta {
	 *     Default meta values and keys for the user.
	 *
	 *     @type string   $nickname             The user's nickname. Default is the user's username.
	 *     @type string   $first_name           The user's first name.
	 *     @type string   $last_name            The user's last name.
	 *     @type string   $description          The user's description.
	 *     @type string   $rich_editing         Whether to enable the rich-editor for the user. Default 'true'.
	 *     @type string   $syntax_highlighting  Whether to enable the rich code editor for the user. Default 'true'.
	 *     @type string   $comment_shortcuts    Whether to enable keyboard shortcuts for the user. Default 'false'.
	 *     @type string   $admin_color          The color scheme for a user's admin screen. Default 'fresh'.
	 *     @type int|bool $use_ssl              Whether to force SSL on the user's admin area. 0|false if SSL
	 *                                          is not forced.
	 *     @type string   $show_admin_bar_front Whether to show the admin bar on the front end for the user.
	 *                                          Default 'true'.
	 *     @type string   $locale               User's locale. Default empty.
	 * }
	 * @param WP_User $user     User object.
	 * @param bool    $update   Whether the user is being updated rather than created.
	 * @param array   $userdata The raw array of data passed to wp_insert_user().
	 */
	$meta = apply_filters( 'insert_user_meta', $meta, $user, $update, $userdata );

	$custom_meta = array();
	if ( array_key_exists( 'meta_input', $userdata ) && is_array( $userdata['meta_input'] ) && ! empty( $userdata['meta_input'] ) ) {
		$custom_meta = $userdata['meta_input'];
	}

	/**
	 * Filters a user's custom meta values and keys immediately after the user is created or updated
	 * and before any user meta is inserted or updated.
	 *
	 * For non-custom meta fields, see the {@see 'insert_user_meta'} filter.
	 *
	 * @since 5.9.0
	 *
	 * @param array   $custom_meta Array of custom user meta values keyed by meta key.
	 * @param WP_User $user        User object.
	 * @param bool    $update      Whether the user is being updated rather than created.
	 * @param array   $userdata    The raw array of data passed to wp_insert_user().
	 */
	$custom_meta = apply_filters( 'insert_custom_user_meta', $custom_meta, $user, $update, $userdata );

	$meta = array_merge( $meta, $custom_meta );

	if ( $update ) {
		// Update user meta.
		foreach ( $meta as $key => $value ) {
			update_user_meta( $user_id, $key, $value );
		}
	} else {
		// Add user meta.
		foreach ( $meta as $key => $value ) {
			add_user_meta( $user_id, $key, $value );
		}
	}

	foreach ( wp_get_user_contact_methods( $user ) as $key => $value ) {
		if ( isset( $userdata[ $key ] ) ) {
			update_user_meta( $user_id, $key, $userdata[ $key ] );
		}
	}

	if ( isset( $userdata['role'] ) ) {
		$user->set_role( $userdata['role'] );
	} elseif ( ! $update ) {
		$user->set_role( get_option( 'default_role' ) );
	}

	clean_user_cache( $user_id );

	if ( $update ) {
		/**
		 * Fires immediately after an existing user is updated.
		 *
		 * @since 2.0.0
		 * @since 5.8.0 The `$userdata` parameter was added.
		 *
		 * @param int     $user_id       User ID.
		 * @param WP_User $old_user_data Object containing user's data prior to update.
		 * @param array   $userdata      The raw array of data passed to wp_insert_user().
		 */
		do_action( 'profile_update', $user_id, $old_user_data, $userdata );

		if ( isset( $userdata['spam'] ) && $userdata['spam'] !== $old_user_data->spam ) {
			if ( '1' === $userdata['spam'] ) {
				/**
				 * Fires after the user is marked as a SPAM user.
				 *
				 * @since 3.0.0
				 *
				 * @param int $user_id ID of the user marked as SPAM.
				 */
				do_action( 'make_spam_user', $user_id );
			} else {
				/**
				 * Fires after the user is marked as a HAM user. Opposite of SPAM.
				 *
				 * @since 3.0.0
				 *
				 * @param int $user_id ID of the user marked as HAM.
				 */
				do_action( 'make_ham_user', $user_id );
			}
		}
	} else {
		/**
		 * Fires immediately after a new user is registered.
		 *
		 * @since 1.5.0
		 * @since 5.8.0 The `$userdata` parameter was added.
		 *
		 * @param int   $user_id  User ID.
		 * @param array $userdata The raw array of data passed to wp_insert_user().
		 */
		do_action( 'user_register', $user_id, $userdata );
	}

	return $user_id;
}

/**
 * Updates a user in the database.
 *
 * It is possible to update a user's password by specifying the 'user_pass'
 * value in the $userdata parameter array.
 *
 * If current user's password is being updated, then the cookies will be
 * cleared.
 *
 * @since 2.0.0
 *
 * @see wp_insert_user() For what fields can be set in $userdata.
 *
 * @param array|object|WP_User $userdata An array of user data or a user object of type stdClass or WP_User.
 * @return int|WP_Error The updated user's ID or a WP_Error object if the user could not be updated.
 */
function wp_update_user( $userdata ) {
	if ( $userdata instanceof stdClass ) {
		$userdata = get_object_vars( $userdata );
	} elseif ( $userdata instanceof WP_User ) {
		$userdata = $userdata->to_array();
	}

	$userdata_raw = $userdata;

	$user_id = isset( $userdata['ID'] ) ? (int) $userdata['ID'] : 0;
	if ( ! $user_id ) {
		return new WP_Error( 'invalid_user_id', __( 'Invalid user ID.' ) );
	}

	// First, get all of the original fields.
	$user_obj = get_userdata( $user_id );
	if ( ! $user_obj ) {
		return new WP_Error( 'invalid_user_id', __( 'Invalid user ID.' ) );
	}

	$user = $user_obj->to_array();

	// Add additional custom fields.
	foreach ( _get_additional_user_keys( $user_obj ) as $key ) {
		$user[ $key ] = get_user_meta( $user_id, $key, true );
	}

	// Escape data pulled from DB.
	$user = add_magic_quotes( $user );

	if ( ! empty( $userdata['user_pass'] ) && $userdata['user_pass'] !== $user_obj->user_pass ) {
		// If password is changing, hash it now.
		$plaintext_pass        = $userdata['user_pass'];
		$userdata['user_pass'] = wp_hash_password( $userdata['user_pass'] );

		/**
		 * Filters whether to send the password change email.
		 *
		 * @since 4.3.0
		 *
		 * @see wp_insert_user() For `$user` and `$userdata` fields.
		 *
		 * @param bool  $send     Whether to send the email.
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$send_password_change_email = apply_filters( 'send_password_change_email', true, $user, $userdata );
	}

	if ( isset( $userdata['user_email'] ) && $user['user_email'] !== $userdata['user_email'] ) {
		/**
		 * Filters whether to send the email change email.
		 *
		 * @since 4.3.0
		 *
		 * @see wp_insert_user() For `$user` and `$userdata` fields.
		 *
		 * @param bool  $send     Whether to send the email.
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$send_email_change_email = apply_filters( 'send_email_change_email', true, $user, $userdata );
	}

	clean_user_cache( $user_obj );

	// Merge old and new fields with new fields overwriting old ones.
	$userdata = array_merge( $user, $userdata );
	$user_id  = wp_insert_user( $userdata );

	if ( is_wp_error( $user_id ) ) {
		return $user_id;
	}

	$blog_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	$switched_locale = false;
	if ( ! empty( $send_password_change_email ) || ! empty( $send_email_change_email ) ) {
		$switched_locale = switch_to_user_locale( $user_id );
	}

	if ( ! empty( $send_password_change_email ) ) {
		/* translators: Do not translate USERNAME, ADMIN_EMAIL, EMAIL, SITENAME, SITEURL: those are placeholders. */
		$pass_change_text = __(
			'Hi ###USERNAME###,

This notice confirms that your password was changed on ###SITENAME###.

If you did not change your password, please contact the Site Administrator at
###ADMIN_EMAIL###

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);

		$pass_change_email = array(
			'to'      => $user['user_email'],
			/* translators: Password change notification email subject. %s: Site title. */
			'subject' => __( '[%s] Password Changed' ),
			'message' => $pass_change_text,
			'headers' => '',
		);

		/**
		 * Filters the contents of the email sent when the user's password is changed.
		 *
		 * @since 4.3.0
		 *
		 * @param array $pass_change_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipients. Add emails in a comma separated string.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The content of the email.
		 *         The following strings have a special meaning and will get replaced dynamically:
		 *         - ###USERNAME###    The current user's username.
		 *         - ###ADMIN_EMAIL### The admin email in case this was unexpected.
		 *         - ###EMAIL###       The user's email address.
		 *         - ###SITENAME###    The name of the site.
		 *         - ###SITEURL###     The URL to the site.
		 *     @type string $headers Headers. Add headers in a newline (\r\n) separated string.
		 * }
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$pass_change_email = apply_filters( 'password_change_email', $pass_change_email, $user, $userdata );

		$pass_change_email['message'] = str_replace( '###USERNAME###', $user['user_login'], $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###ADMIN_EMAIL###', get_option( 'admin_email' ), $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###EMAIL###', $user['user_email'], $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###SITENAME###', $blog_name, $pass_change_email['message'] );
		$pass_change_email['message'] = str_replace( '###SITEURL###', home_url(), $pass_change_email['message'] );

		wp_mail( $pass_change_email['to'], sprintf( $pass_change_email['subject'], $blog_name ), $pass_change_email['message'], $pass_change_email['headers'] );
	}

	if ( ! empty( $send_email_change_email ) ) {
		/* translators: Do not translate USERNAME, ADMIN_EMAIL, NEW_EMAIL, EMAIL, SITENAME, SITEURL: those are placeholders. */
		$email_change_text = __(
			'Hi ###USERNAME###,

This notice confirms that your email address on ###SITENAME### was changed to ###NEW_EMAIL###.

If you did not change your email, please contact the Site Administrator at
###ADMIN_EMAIL###

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);

		$email_change_email = array(
			'to'      => $user['user_email'],
			/* translators: Email change notification email subject. %s: Site title. */
			'subject' => __( '[%s] Email Changed' ),
			'message' => $email_change_text,
			'headers' => '',
		);

		/**
		 * Filters the contents of the email sent when the user's email is changed.
		 *
		 * @since 4.3.0
		 *
		 * @param array $email_change_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipients.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The content of the email.
		 *         The following strings have a special meaning and will get replaced dynamically:
		 *         - ###USERNAME###    The current user's username.
		 *         - ###ADMIN_EMAIL### The admin email in case this was unexpected.
		 *         - ###NEW_EMAIL###   The new email address.
		 *         - ###EMAIL###       The old email address.
		 *         - ###SITENAME###    The name of the site.
		 *         - ###SITEURL###     The URL to the site.
		 *     @type string $headers Headers.
		 * }
		 * @param array $user     The original user array.
		 * @param array $userdata The updated user array.
		 */
		$email_change_email = apply_filters( 'email_change_email', $email_change_email, $user, $userdata );

		$email_change_email['message'] = str_replace( '###USERNAME###', $user['user_login'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###ADMIN_EMAIL###', get_option( 'admin_email' ), $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $userdata['user_email'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###EMAIL###', $user['user_email'], $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###SITENAME###', $blog_name, $email_change_email['message'] );
		$email_change_email['message'] = str_replace( '###SITEURL###', home_url(), $email_change_email['message'] );

		wp_mail( $email_change_email['to'], sprintf( $email_change_email['subject'], $blog_name ), $email_change_email['message'], $email_change_email['headers'] );
	}

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	// Update the cookies if the password changed.
	$current_user = wp_get_current_user();
	if ( $current_user->ID === $user_id ) {
		if ( isset( $plaintext_pass ) ) {
			wp_clear_auth_cookie();

			/*
			 * Here we calculate the expiration length of the current auth cookie and compare it to the default expiration.
			 * If it's greater than this, then we know the user checked 'Remember Me' when they logged in.
			 */
			$logged_in_cookie = wp_parse_auth_cookie( '', 'logged_in' );
			/** This filter is documented in wp-includes/pluggable.php */
			$default_cookie_life = apply_filters( 'auth_cookie_expiration', ( 2 * DAY_IN_SECONDS ), $user_id, false );

			$remember = false;

			if ( false !== $logged_in_cookie && ( $logged_in_cookie['expiration'] - time() ) > $default_cookie_life ) {
				$remember = true;
			}

			wp_set_auth_cookie( $user_id, $remember );
		}
	}

	/**
	 * Fires after the user has been updated and emails have been sent.
	 *
	 * @since 6.3.0
	 *
	 * @param int   $user_id      The ID of the user that was just updated.
	 * @param array $userdata     The array of user data that was updated.
	 * @param array $userdata_raw The unedited array of user data that was updated.
	 */
	do_action( 'wp_update_user', $user_id, $userdata, $userdata_raw );

	return $user_id;
}

/**
 * Provides a simpler way of inserting a user into the database.
 *
 * Creates a new user with just the username, password, and email. For more
 * complex user creation use wp_insert_user() to specify more information.
 *
 * @since 2.0.0
 *
 * @see wp_insert_user() More complete way to create a new user.
 *
 * @param string $username The user's username.
 * @param string $password The user's password.
 * @param string $email    Optional. The user's email. Default empty.
 * @return int|WP_Error The newly created user's ID or a WP_Error object if the user could not
 *                      be created.
 */
function wp_create_user( $username, $password, $email = '' ) {
	$user_login = wp_slash( $username );
	$user_email = wp_slash( $email );
	$user_pass  = $password;

	$userdata = compact( 'user_login', 'user_email', 'user_pass' );
	return wp_insert_user( $userdata );
}

/**
 * Returns a list of meta keys to be (maybe) populated in wp_update_user().
 *
 * The list of keys returned via this function are dependent on the presence
 * of those keys in the user meta data to be set.
 *
 * @since 3.3.0
 * @access private
 *
 * @param WP_User $user WP_User instance.
 * @return string[] List of user keys to be populated in wp_update_user().
 */
function _get_additional_user_keys( $user ) {
	$keys = array( 'first_name', 'last_name', 'nickname', 'description', 'rich_editing', 'syntax_highlighting', 'comment_shortcuts', 'admin_color', 'use_ssl', 'show_admin_bar_front', 'locale' );
	return array_merge( $keys, array_keys( wp_get_user_contact_methods( $user ) ) );
}

/**
 * Sets up the user contact methods.
 *
 * Default contact methods were removed in 3.6. A filter dictates contact methods.
 *
 * @since 3.7.0
 *
 * @param WP_User|null $user Optional. WP_User object.
 * @return string[] Array of contact method labels keyed by contact method.
 */
function wp_get_user_contact_methods( $user = null ) {
	$methods = array();
	if ( get_site_option( 'initial_db_version' ) < 23588 ) {
		$methods = array(
			'aim'    => __( 'AIM' ),
			'yim'    => __( 'Yahoo IM' ),
			'jabber' => __( 'Jabber / Google Talk' ),
		);
	}

	/**
	 * Filters the user contact methods.
	 *
	 * @since 2.9.0
	 *
	 * @param string[]     $methods Array of contact method labels keyed by contact method.
	 * @param WP_User|null $user    WP_User object or null if none was provided.
	 */
	return apply_filters( 'user_contactmethods', $methods, $user );
}

/**
 * The old private function for setting up user contact methods.
 *
 * Use wp_get_user_contact_methods() instead.
 *
 * @since 2.9.0
 * @access private
 *
 * @param WP_User|null $user Optional. WP_User object. Default null.
 * @return string[] Array of contact method labels keyed by contact method.
 */
function _wp_get_user_contactmethods( $user = null ) {
	return wp_get_user_contact_methods( $user );
}

/**
 * Gets the text suggesting how to create strong passwords.
 *
 * @since 4.1.0
 *
 * @return string The password hint text.
 */
function wp_get_password_hint() {
	$hint = __( 'Hint: The password should be at least twelve characters long. To make it stronger, use upper and lower case letters, numbers, and symbols like ! " ? $ % ^ &amp; ).' );

	/**
	 * Filters the text describing the site's password complexity policy.
	 *
	 * @since 4.1.0
	 *
	 * @param string $hint The password hint text.
	 */
	return apply_filters( 'password_hint', $hint );
}

/**
 * Creates, stores, then returns a password reset key for user.
 *
 * @since 4.4.0
 *
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
 *
 * @param WP_User $user User to retrieve password reset key for.
 * @return string|WP_Error Password reset key on success. WP_Error on error.
 */
function get_password_reset_key( $user ) {
	global $wp_hasher;

	if ( ! ( $user instanceof WP_User ) ) {
		return new WP_Error( 'invalidcombo', __( '<strong>Error:</strong> There is no account with that username or email address.' ) );
	}

	/**
	 * Fires before a new password is retrieved.
	 *
	 * Use the {@see 'retrieve_password'} hook instead.
	 *
	 * @since 1.5.0
	 * @deprecated 1.5.1 Misspelled. Use {@see 'retrieve_password'} hook instead.
	 *
	 * @param string $user_login The user login name.
	 */
	do_action_deprecated( 'retreive_password', array( $user->user_login ), '1.5.1', 'retrieve_password' );

	/**
	 * Fires before a new password is retrieved.
	 *
	 * @since 1.5.1
	 *
	 * @param string $user_login The user login name.
	 */
	do_action( 'retrieve_password', $user->user_login );

	$password_reset_allowed = wp_is_password_reset_allowed_for_user( $user );
	if ( ! $password_reset_allowed ) {
		return new WP_Error( 'no_password_reset', __( 'Password reset is not allowed for this user' ) );
	} elseif ( is_wp_error( $password_reset_allowed ) ) {
		return $password_reset_allowed;
	}

	// Generate something random for a password reset key.
	$key = wp_generate_password( 20, false );

	/**
	 * Fires when a password reset key is generated.
	 *
	 * @since 2.5.0
	 *
	 * @param string $user_login The username for the user.
	 * @param string $key        The generated password reset key.
	 */
	do_action( 'retrieve_password_key', $user->user_login, $key );

	// Now insert the key, hashed, into the DB.
	if ( empty( $wp_hasher ) ) {
		require_once ABSPATH . WPINC . '/class-phpass.php';
		$wp_hasher = new PasswordHash( 8, true );
	}

	$hashed = time() . ':' . $wp_hasher->HashPassword( $key );

	$key_saved = wp_update_user(
		array(
			'ID'                  => $user->ID,
			'user_activation_key' => $hashed,
		)
	);

	if ( is_wp_error( $key_saved ) ) {
		return $key_saved;
	}

	return $key;
}

/**
 * Retrieves a user row based on password reset key and login.
 *
 * A key is considered 'expired' if it exactly matches the value of the
 * user_activation_key field, rather than being matched after going through the
 * hashing process. This field is now hashed; old values are no longer accepted
 * but have a different WP_Error code so good user feedback can be provided.
 *
 * @since 3.1.0
 *
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
 *
 * @param string $key       Hash to validate sending user's password.
 * @param string $login     The user login.
 * @return WP_User|WP_Error WP_User object on success, WP_Error object for invalid or expired keys.
 */
function check_password_reset_key( $key, $login ) {
	global $wp_hasher;

	$key = preg_replace( '/[^a-z0-9]/i', '', $key );

	if ( empty( $key ) || ! is_string( $key ) ) {
		return new WP_Error( 'invalid_key', __( 'Invalid key.' ) );
	}

	if ( empty( $login ) || ! is_string( $login ) ) {
		return new WP_Error( 'invalid_key', __( 'Invalid key.' ) );
	}

	$user = get_user_by( 'login', $login );

	if ( ! $user ) {
		return new WP_Error( 'invalid_key', __( 'Invalid key.' ) );
	}

	if ( empty( $wp_hasher ) ) {
		require_once ABSPATH . WPINC . '/class-phpass.php';
		$wp_hasher = new PasswordHash( 8, true );
	}

	/**
	 * Filters the expiration time of password reset keys.
	 *
	 * @since 4.3.0
	 *
	 * @param int $expiration The expiration time in seconds.
	 */
	$expiration_duration = apply_filters( 'password_reset_expiration', DAY_IN_SECONDS );

	if ( str_contains( $user->user_activation_key, ':' ) ) {
		list( $pass_request_time, $pass_key ) = explode( ':', $user->user_activation_key, 2 );
		$expiration_time                      = $pass_request_time + $expiration_duration;
	} else {
		$pass_key        = $user->user_activation_key;
		$expiration_time = false;
	}

	if ( ! $pass_key ) {
		return new WP_Error( 'invalid_key', __( 'Invalid key.' ) );
	}

	$hash_is_correct = $wp_hasher->CheckPassword( $key, $pass_key );

	if ( $hash_is_correct && $expiration_time && time() < $expiration_time ) {
		return $user;
	} elseif ( $hash_is_correct && $expiration_time ) {
		// Key has an expiration time that's passed.
		return new WP_Error( 'expired_key', __( 'Invalid key.' ) );
	}

	if ( hash_equals( $user->user_activation_key, $key ) || ( $hash_is_correct && ! $expiration_time ) ) {
		$return  = new WP_Error( 'expired_key', __( 'Invalid key.' ) );
		$user_id = $user->ID;

		/**
		 * Filters the return value of check_password_reset_key() when an
		 * old-style key is used.
		 *
		 * @since 3.7.0 Previously plain-text keys were stored in the database.
		 * @since 4.3.0 Previously key hashes were stored without an expiration time.
		 *
		 * @param WP_Error $return  A WP_Error object denoting an expired key.
		 *                          Return a WP_User object to validate the key.
		 * @param int      $user_id The matched user ID.
		 */
		return apply_filters( 'password_reset_key_expired', $return, $user_id );
	}

	return new WP_Error( 'invalid_key', __( 'Invalid key.' ) );
}

/**
 * Handles sending a password retrieval email to a user.
 *
 * @since 2.5.0
 * @since 5.7.0 Added `$user_login` parameter.
 *
 * @global wpdb         $wpdb      WordPress database abstraction object.
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
 *
 * @param string $user_login Optional. Username to send a password retrieval email for.
 *                           Defaults to `$_POST['user_login']` if not set.
 * @return true|WP_Error True when finished, WP_Error object on error.
 */
function retrieve_password( $user_login = null ) {
	$errors    = new WP_Error();
	$user_data = false;

	// Use the passed $user_login if available, otherwise use $_POST['user_login'].
	if ( ! $user_login && ! empty( $_POST['user_login'] ) ) {
		$user_login = $_POST['user_login'];
	}

	$user_login = trim( wp_unslash( $user_login ) );

	if ( empty( $user_login ) ) {
		$errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username or email address.' ) );
	} elseif ( strpos( $user_login, '@' ) ) {
		$user_data = get_user_by( 'email', $user_login );

		if ( empty( $user_data ) ) {
			$user_data = get_user_by( 'login', $user_login );
		}

		if ( empty( $user_data ) ) {
			$errors->add( 'invalid_email', __( '<strong>Error:</strong> There is no account with that username or email address.' ) );
		}
	} else {
		$user_data = get_user_by( 'login', $user_login );
	}

	/**
	 * Filters the user data during a password reset request.
	 *
	 * Allows, for example, custom validation using data other than username or email address.
	 *
	 * @since 5.7.0
	 *
	 * @param WP_User|false $user_data WP_User object if found, false if the user does not exist.
	 * @param WP_Error      $errors    A WP_Error object containing any errors generated
	 *                                 by using invalid credentials.
	 */
	$user_data = apply_filters( 'lostpassword_user_data', $user_data, $errors );

	/**
	 * Fires before errors are returned from a password reset request.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 Added the `$errors` parameter.
	 * @since 5.4.0 Added the `$user_data` parameter.
	 *
	 * @param WP_Error      $errors    A WP_Error object containing any errors generated
	 *                                 by using invalid credentials.
	 * @param WP_User|false $user_data WP_User object if found, false if the user does not exist.
	 */
	do_action( 'lostpassword_post', $errors, $user_data );

	/**
	 * Filters the errors encountered on a password reset request.
	 *
	 * The filtered WP_Error object may, for example, contain errors for an invalid
	 * username or email address. A WP_Error object should always be returned,
	 * but may or may not contain errors.
	 *
	 * If any errors are present in $errors, this will abort the password reset request.
	 *
	 * @since 5.5.0
	 *
	 * @param WP_Error      $errors    A WP_Error object containing any errors generated
	 *                                 by using invalid credentials.
	 * @param WP_User|false $user_data WP_User object if found, false if the user does not exist.
	 */
	$errors = apply_filters( 'lostpassword_errors', $errors, $user_data );

	if ( $errors->has_errors() ) {
		return $errors;
	}

	if ( ! $user_data ) {
		$errors->add( 'invalidcombo', __( '<strong>Error:</strong> There is no account with that username or email address.' ) );
		return $errors;
	}

	/**
	 * Filters whether to send the retrieve password email.
	 *
	 * Return false to disable sending the email.
	 *
	 * @since 6.0.0
	 *
	 * @param bool    $send       Whether to send the email.
	 * @param string  $user_login The username for the user.
	 * @param WP_User $user_data  WP_User object.
	 */
	if ( ! apply_filters( 'send_retrieve_password_email', true, $user_login, $user_data ) ) {
		return true;
	}

	// Redefining user_login ensures we return the right case in the email.
	$user_login = $user_data->user_login;
	$user_email = $user_data->user_email;
	$key        = get_password_reset_key( $user_data );

	if ( is_wp_error( $key ) ) {
		return $key;
	}

	// Localize password reset message content for user.
	$locale = get_user_locale( $user_data );

	$switched_locale = switch_to_user_locale( $user_data->ID );

	if ( is_multisite() ) {
		$site_name = get_network()->site_name;
	} else {
		/*
		 * The blogname option is escaped with esc_html on the way into the database
		 * in sanitize_option. We want to reverse this for the plain text arena of emails.
		 */
		$site_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
	}

	$message = __( 'Someone has requested a password reset for the following account:' ) . "\r\n\r\n";
	/* translators: %s: Site name. */
	$message .= sprintf( __( 'Site Name: %s' ), $site_name ) . "\r\n\r\n";
	/* translators: %s: User login. */
	$message .= sprintf( __( 'Username: %s' ), $user_login ) . "\r\n\r\n";
	$message .= __( 'If this was a mistake, ignore this email and nothing will happen.' ) . "\r\n\r\n";
	$message .= __( 'To reset your password, visit the following address:' ) . "\r\n\r\n";
	$message .= network_site_url( "wp-login.php?action=rp&key=$key&login=" . rawurlencode( $user_login ), 'login' ) . '&wp_lang=' . $locale . "\r\n\r\n";

	if ( ! is_user_logged_in() ) {
		$requester_ip = $_SERVER['REMOTE_ADDR'];
		if ( $requester_ip ) {
			$message .= sprintf(
				/* translators: %s: IP address of password reset requester. */
				__( 'This password reset request originated from the IP address %s.' ),
				$requester_ip
			) . "\r\n";
		}
	}

	/* translators: Password reset notification email subject. %s: Site title. */
	$title = sprintf( __( '[%s] Password Reset' ), $site_name );

	/**
	 * Filters the subject of the password reset email.
	 *
	 * @since 2.8.0
	 * @since 4.4.0 Added the `$user_login` and `$user_data` parameters.
	 *
	 * @param string  $title      Email subject.
	 * @param string  $user_login The username for the user.
	 * @param WP_User $user_data  WP_User object.
	 */
	$title = apply_filters( 'retrieve_password_title', $title, $user_login, $user_data );

	/**
	 * Filters the message body of the password reset mail.
	 *
	 * If the filtered message is empty, the password reset email will not be sent.
	 *
	 * @since 2.8.0
	 * @since 4.1.0 Added `$user_login` and `$user_data` parameters.
	 *
	 * @param string  $message    Email message.
	 * @param string  $key        The activation key.
	 * @param string  $user_login The username for the user.
	 * @param WP_User $user_data  WP_User object.
	 */
	$message = apply_filters( 'retrieve_password_message', $message, $key, $user_login, $user_data );

	// Short-circuit on falsey $message value for backwards compatibility.
	if ( ! $message ) {
		return true;
	}

	/*
	 * Wrap the single notification email arguments in an array
	 * to pass them to the retrieve_password_notification_email filter.
	 */
	$defaults = array(
		'to'      => $user_email,
		'subject' => $title,
		'message' => $message,
		'headers' => '',
	);

	/**
	 * Filters the contents of the reset password notification email sent to the user.
	 *
	 * @since 6.0.0
	 *
	 * @param array $defaults {
	 *     The default notification email arguments. Used to build wp_mail().
	 *
	 *     @type string $to      The intended recipient - user email address.
	 *     @type string $subject The subject of the email.
	 *     @type string $message The body of the email.
	 *     @type string $headers The headers of the email.
	 * }
	 * @param string  $key        The activation key.
	 * @param string  $user_login The username for the user.
	 * @param WP_User $user_data  WP_User object.
	 */
	$notification_email = apply_filters( 'retrieve_password_notification_email', $defaults, $key, $user_login, $user_data );

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	if ( is_array( $notification_email ) ) {
		// Force key order and merge defaults in case any value is missing in the filtered array.
		$notification_email = array_merge( $defaults, $notification_email );
	} else {
		$notification_email = $defaults;
	}

	list( $to, $subject, $message, $headers ) = array_values( $notification_email );

	$subject = wp_specialchars_decode( $subject );

	if ( ! wp_mail( $to, $subject, $message, $headers ) ) {
		$errors->add(
			'retrieve_password_email_failure',
			sprintf(
				/* translators: %s: Documentation URL. */
				__( '<strong>Error:</strong> The email could not be sent. Your site may not be correctly configured to send emails. <a href="%s">Get support for resetting your password</a>.' ),
				esc_url( __( 'https://wordpress.org/documentation/article/reset-your-password/' ) )
			)
		);
		return $errors;
	}

	return true;
}

/**
 * Handles resetting the user's password.
 *
 * @since 2.5.0
 *
 * @param WP_User $user     The user
 * @param string  $new_pass New password for the user in plaintext
 */
function reset_password( $user, $new_pass ) {
	/**
	 * Fires before the user's password is reset.
	 *
	 * @since 1.5.0
	 *
	 * @param WP_User $user     The user.
	 * @param string  $new_pass New user password.
	 */
	do_action( 'password_reset', $user, $new_pass );

	wp_set_password( $new_pass, $user->ID );
	update_user_meta( $user->ID, 'default_password_nag', false );

	/**
	 * Fires after the user's password is reset.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_User $user     The user.
	 * @param string  $new_pass New user password.
	 */
	do_action( 'after_password_reset', $user, $new_pass );
}

/**
 * Handles registering a new user.
 *
 * @since 2.5.0
 *
 * @param string $user_login User's username for logging in
 * @param string $user_email User's email address to send password and add
 * @return int|WP_Error Either user's ID or error on failure.
 */
function register_new_user( $user_login, $user_email ) {
	$errors = new WP_Error();

	$sanitized_user_login = sanitize_user( $user_login );
	/**
	 * Filters the email address of a user being registered.
	 *
	 * @since 2.1.0
	 *
	 * @param string $user_email The email address of the new user.
	 */
	$user_email = apply_filters( 'user_registration_email', $user_email );

	// Check the username.
	if ( '' === $sanitized_user_login ) {
		$errors->add( 'empty_username', __( '<strong>Error:</strong> Please enter a username.' ) );
	} elseif ( ! validate_username( $user_login ) ) {
		$errors->add( 'invalid_username', __( '<strong>Error:</strong> This username is invalid because it uses illegal characters. Please enter a valid username.' ) );
		$sanitized_user_login = '';
	} elseif ( username_exists( $sanitized_user_login ) ) {
		$errors->add( 'username_exists', __( '<strong>Error:</strong> This username is already registered. Please choose another one.' ) );
	} else {
		/** This filter is documented in wp-includes/user.php */
		$illegal_user_logins = (array) apply_filters( 'illegal_user_logins', array() );
		if ( in_array( strtolower( $sanitized_user_login ), array_map( 'strtolower', $illegal_user_logins ), true ) ) {
			$errors->add( 'invalid_username', __( '<strong>Error:</strong> Sorry, that username is not allowed.' ) );
		}
	}

	// Check the email address.
	if ( '' === $user_email ) {
		$errors->add( 'empty_email', __( '<strong>Error:</strong> Please type your email address.' ) );
	} elseif ( ! is_email( $user_email ) ) {
		$errors->add( 'invalid_email', __( '<strong>Error:</strong> The email address is not correct.' ) );
		$user_email = '';
	} elseif ( email_exists( $user_email ) ) {
		$errors->add(
			'email_exists',
			sprintf(
				/* translators: %s: Link to the login page. */
				__( '<strong>Error:</strong> This email address is already registered. <a href="%s">Log in</a> with this address or choose another one.' ),
				wp_login_url()
			)
		);
	}

	/**
	 * Fires when submitting registration form data, before the user is created.
	 *
	 * @since 2.1.0
	 *
	 * @param string   $sanitized_user_login The submitted username after being sanitized.
	 * @param string   $user_email           The submitted email.
	 * @param WP_Error $errors               Contains any errors with submitted username and email,
	 *                                       e.g., an empty field, an invalid username or email,
	 *                                       or an existing username or email.
	 */
	do_action( 'register_post', $sanitized_user_login, $user_email, $errors );

	/**
	 * Filters the errors encountered when a new user is being registered.
	 *
	 * The filtered WP_Error object may, for example, contain errors for an invalid
	 * or existing username or email address. A WP_Error object should always be returned,
	 * but may or may not contain errors.
	 *
	 * If any errors are present in $errors, this will abort the user's registration.
	 *
	 * @since 2.1.0
	 *
	 * @param WP_Error $errors               A WP_Error object containing any errors encountered
	 *                                       during registration.
	 * @param string   $sanitized_user_login User's username after it has been sanitized.
	 * @param string   $user_email           User's email.
	 */
	$errors = apply_filters( 'registration_errors', $errors, $sanitized_user_login, $user_email );

	if ( $errors->has_errors() ) {
		return $errors;
	}

	$user_pass = wp_generate_password( 12, false );
	$user_id   = wp_create_user( $sanitized_user_login, $user_pass, $user_email );
	if ( ! $user_id || is_wp_error( $user_id ) ) {
		$errors->add(
			'registerfail',
			sprintf(
				/* translators: %s: Admin email address. */
				__( '<strong>Error:</strong> Could not register you&hellip; please contact the <a href="mailto:%s">site admin</a>!' ),
				get_option( 'admin_email' )
			)
		);
		return $errors;
	}

	update_user_meta( $user_id, 'default_password_nag', true ); // Set up the password change nag.

	if ( ! empty( $_COOKIE['wp_lang'] ) ) {
		$wp_lang = sanitize_text_field( $_COOKIE['wp_lang'] );
		if ( in_array( $wp_lang, get_available_languages(), true ) ) {
			update_user_meta( $user_id, 'locale', $wp_lang ); // Set user locale if defined on registration.
		}
	}

	/**
	 * Fires after a new user registration has been recorded.
	 *
	 * @since 4.4.0
	 *
	 * @param int $user_id ID of the newly registered user.
	 */
	do_action( 'register_new_user', $user_id );

	return $user_id;
}

/**
 * Initiates email notifications related to the creation of new users.
 *
 * Notifications are sent both to the site admin and to the newly created user.
 *
 * @since 4.4.0
 * @since 4.6.0 Converted the `$notify` parameter to accept 'user' for sending
 *              notifications only to the user created.
 *
 * @param int    $user_id ID of the newly created user.
 * @param string $notify  Optional. Type of notification that should happen. Accepts 'admin'
 *                        or an empty string (admin only), 'user', or 'both' (admin and user).
 *                        Default 'both'.
 */
function wp_send_new_user_notifications( $user_id, $notify = 'both' ) {
	wp_new_user_notification( $user_id, null, $notify );
}

/**
 * Retrieves the current session token from the logged_in cookie.
 *
 * @since 4.0.0
 *
 * @return string Token.
 */
function wp_get_session_token() {
	$cookie = wp_parse_auth_cookie( '', 'logged_in' );
	return ! empty( $cookie['token'] ) ? $cookie['token'] : '';
}

/**
 * Retrieves a list of sessions for the current user.
 *
 * @since 4.0.0
 *
 * @return array Array of sessions.
 */
function wp_get_all_sessions() {
	$manager = WP_Session_Tokens::get_instance( get_current_user_id() );
	return $manager->get_all();
}

/**
 * Removes the current session token from the database.
 *
 * @since 4.0.0
 */
function wp_destroy_current_session() {
	$token = wp_get_session_token();
	if ( $token ) {
		$manager = WP_Session_Tokens::get_instance( get_current_user_id() );
		$manager->destroy( $token );
	}
}

/**
 * Removes all but the current session token for the current user for the database.
 *
 * @since 4.0.0
 */
function wp_destroy_other_sessions() {
	$token = wp_get_session_token();
	if ( $token ) {
		$manager = WP_Session_Tokens::get_instance( get_current_user_id() );
		$manager->destroy_others( $token );
	}
}

/**
 * Removes all session tokens for the current user from the database.
 *
 * @since 4.0.0
 */
function wp_destroy_all_sessions() {
	$manager = WP_Session_Tokens::get_instance( get_current_user_id() );
	$manager->destroy_all();
}

/**
 * Gets the user IDs of all users with no role on this site.
 *
 * @since 4.4.0
 * @since 4.9.0 The `$site_id` parameter was added to support multisite.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|null $site_id Optional. The site ID to get users with no role for. Defaults to the current site.
 * @return string[] Array of user IDs as strings.
 */
function wp_get_users_with_no_role( $site_id = null ) {
	global $wpdb;

	if ( ! $site_id ) {
		$site_id = get_current_blog_id();
	}

	$prefix = $wpdb->get_blog_prefix( $site_id );

	if ( is_multisite() && get_current_blog_id() !== $site_id ) {
		switch_to_blog( $site_id );
		$role_names = wp_roles()->get_names();
		restore_current_blog();
	} else {
		$role_names = wp_roles()->get_names();
	}

	$regex = implode( '|', array_keys( $role_names ) );
	$regex = preg_replace( '/[^a-zA-Z_\|-]/', '', $regex );
	$users = $wpdb->get_col(
		$wpdb->prepare(
			"SELECT user_id
			FROM $wpdb->usermeta
			WHERE meta_key = '{$prefix}capabilities'
			AND meta_value NOT REGEXP %s",
			$regex
		)
	);

	return $users;
}

/**
 * Retrieves the current user object.
 *
 * Will set the current user, if the current user is not set. The current user
 * will be set to the logged-in person. If no user is logged-in, then it will
 * set the current user to 0, which is invalid and won't have any permissions.
 *
 * This function is used by the pluggable functions wp_get_current_user() and
 * get_currentuserinfo(), the latter of which is deprecated but used for backward
 * compatibility.
 *
 * @since 4.5.0
 * @access private
 *
 * @see wp_get_current_user()
 * @global WP_User $current_user Checks if the current user is set.
 *
 * @return WP_User Current WP_User instance.
 */
function _wp_get_current_user() {
	global $current_user;

	if ( ! empty( $current_user ) ) {
		if ( $current_user instanceof WP_User ) {
			return $current_user;
		}

		// Upgrade stdClass to WP_User.
		if ( is_object( $current_user ) && isset( $current_user->ID ) ) {
			$cur_id       = $current_user->ID;
			$current_user = null;
			wp_set_current_user( $cur_id );
			return $current_user;
		}

		// $current_user has a junk value. Force to WP_User with ID 0.
		$current_user = null;
		wp_set_current_user( 0 );
		return $current_user;
	}

	if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
		wp_set_current_user( 0 );
		return $current_user;
	}

	/**
	 * Filters the current user.
	 *
	 * The default filters use this to determine the current user from the
	 * request's cookies, if available.
	 *
	 * Returning a value of false will effectively short-circuit setting
	 * the current user.
	 *
	 * @since 3.9.0
	 *
	 * @param int|false $user_id User ID if one has been determined, false otherwise.
	 */
	$user_id = apply_filters( 'determine_current_user', false );
	if ( ! $user_id ) {
		wp_set_current_user( 0 );
		return $current_user;
	}

	wp_set_current_user( $user_id );

	return $current_user;
}

/**
 * Sends a confirmation request email when a change of user email address is attempted.
 *
 * @since 3.0.0
 * @since 4.9.0 This function was moved from wp-admin/includes/ms.php so it's no longer Multisite specific.
 *
 * @global WP_Error $errors WP_Error object.
 */
function send_confirmation_on_profile_email() {
	global $errors;

	$current_user = wp_get_current_user();
	if ( ! is_object( $errors ) ) {
		$errors = new WP_Error();
	}

	if ( $current_user->ID !== (int) $_POST['user_id'] ) {
		return false;
	}

	if ( $current_user->user_email !== $_POST['email'] ) {
		if ( ! is_email( $_POST['email'] ) ) {
			$errors->add(
				'user_email',
				__( '<strong>Error:</strong> The email address is not correct.' ),
				array(
					'form-field' => 'email',
				)
			);

			return;
		}

		if ( email_exists( $_POST['email'] ) ) {
			$errors->add(
				'user_email',
				__( '<strong>Error:</strong> The email address is already used.' ),
				array(
					'form-field' => 'email',
				)
			);
			delete_user_meta( $current_user->ID, '_new_email' );

			return;
		}

		$hash           = md5( $_POST['email'] . time() . wp_rand() );
		$new_user_email = array(
			'hash'     => $hash,
			'newemail' => $_POST['email'],
		);
		update_user_meta( $current_user->ID, '_new_email', $new_user_email );

		$sitename = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

		/* translators: Do not translate USERNAME, ADMIN_URL, EMAIL, SITENAME, SITEURL: those are placeholders. */
		$email_text = __(
			'Howdy ###USERNAME###,

You recently requested to have the email address on your account changed.

If this is correct, please click on the following link to change it:
###ADMIN_URL###

You can safely ignore and delete this email if you do not want to
take this action.

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);

		/**
		 * Filters the text of the email sent when a change of user email address is attempted.
		 *
		 * The following strings have a special meaning and will get replaced dynamically:
		 * - ###USERNAME###  The current user's username.
		 * - ###ADMIN_URL### The link to click on to confirm the email change.
		 * - ###EMAIL###     The new email.
		 * - ###SITENAME###  The name of the site.
		 * - ###SITEURL###   The URL to the site.
		 *
		 * @since MU (3.0.0)
		 * @since 4.9.0 This filter is no longer Multisite specific.
		 *
		 * @param string $email_text     Text in the email.
		 * @param array  $new_user_email {
		 *     Data relating to the new user email address.
		 *
		 *     @type string $hash     The secure hash used in the confirmation link URL.
		 *     @type string $newemail The proposed new email address.
		 * }
		 */
		$content = apply_filters( 'new_user_email_content', $email_text, $new_user_email );

		$content = str_replace( '###USERNAME###', $current_user->user_login, $content );
		$content = str_replace( '###ADMIN_URL###', esc_url( self_admin_url( 'profile.php?newuseremail=' . $hash ) ), $content );
		$content = str_replace( '###EMAIL###', $_POST['email'], $content );
		$content = str_replace( '###SITENAME###', $sitename, $content );
		$content = str_replace( '###SITEURL###', home_url(), $content );

		/* translators: New email address notification email subject. %s: Site title. */
		wp_mail( $_POST['email'], sprintf( __( '[%s] Email Change Request' ), $sitename ), $content );

		$_POST['email'] = $current_user->user_email;
	}
}

/**
 * Adds an admin notice alerting the user to check for confirmation request email
 * after email address change.
 *
 * @since 3.0.0
 * @since 4.9.0 This function was moved from wp-admin/includes/ms.php so it's no longer Multisite specific.
 *
 * @global string $pagenow The filename of the current screen.
 */
function new_user_email_admin_notice() {
	global $pagenow;

	if ( 'profile.php' === $pagenow && isset( $_GET['updated'] ) ) {
		$email = get_user_meta( get_current_user_id(), '_new_email', true );
		if ( $email ) {
			$message = sprintf(
				/* translators: %s: New email address. */
				__( 'Your email address has not been updated yet. Please check your inbox at %s for a confirmation email.' ),
				'<code>' . esc_html( $email['newemail'] ) . '</code>'
			);
			wp_admin_notice( $message, array( 'type' => 'info' ) );
		}
	}
}

/**
 * Gets all personal data request types.
 *
 * @since 4.9.6
 * @access private
 *
 * @return string[] List of core privacy action types.
 */
function _wp_privacy_action_request_types() {
	return array(
		'export_personal_data',
		'remove_personal_data',
	);
}

/**
 * Registers the personal data exporter for users.
 *
 * @since 4.9.6
 *
 * @param array[] $exporters An array of personal data exporters.
 * @return array[] An array of personal data exporters.
 */
function wp_register_user_personal_data_exporter( $exporters ) {
	$exporters['wordpress-user'] = array(
		'exporter_friendly_name' => __( 'WordPress User' ),
		'callback'               => 'wp_user_personal_data_exporter',
	);

	return $exporters;
}

/**
 * Finds and exports personal data associated with an email address from the user and user_meta table.
 *
 * @since 4.9.6
 * @since 5.4.0 Added 'Community Events Location' group to the export data.
 * @since 5.4.0 Added 'Session Tokens' group to the export data.
 *
 * @param string $email_address  The user's email address.
 * @return array {
 *     An array of personal data.
 *
 *     @type array[] $data An array of personal data arrays.
 *     @type bool    $done Whether the exporter is finished.
 * }
 */
function wp_user_personal_data_exporter( $email_address ) {
	$email_address = trim( $email_address );

	$data_to_export = array();

	$user = get_user_by( 'email', $email_address );

	if ( ! $user ) {
		return array(
			'data' => array(),
			'done' => true,
		);
	}

	$user_meta = get_user_meta( $user->ID );

	$user_props_to_export = array(
		'ID'              => __( 'User ID' ),
		'user_login'      => __( 'User Login Name' ),
		'user_nicename'   => __( 'User Nice Name' ),
		'user_email'      => __( 'User Email' ),
		'user_url'        => __( 'User URL' ),
		'user_registered' => __( 'User Registration Date' ),
		'display_name'    => __( 'User Display Name' ),
		'nickname'        => __( 'User Nickname' ),
		'first_name'      => __( 'User First Name' ),
		'last_name'       => __( 'User Last Name' ),
		'description'     => __( 'User Description' ),
	);

	$user_data_to_export = array();

	foreach ( $user_props_to_export as $key => $name ) {
		$value = '';

		switch ( $key ) {
			case 'ID':
			case 'user_login':
			case 'user_nicename':
			case 'user_email':
			case 'user_url':
			case 'user_registered':
			case 'display_name':
				$value = $user->data->$key;
				break;
			case 'nickname':
			case 'first_name':
			case 'last_name':
			case 'description':
				$value = $user_meta[ $key ][0];
				break;
		}

		if ( ! empty( $value ) ) {
			$user_data_to_export[] = array(
				'name'  => $name,
				'value' => $value,
			);
		}
	}

	// Get the list of reserved names.
	$reserved_names = array_values( $user_props_to_export );

	/**
	 * Filters the user's profile data for the privacy exporter.
	 *
	 * @since 5.4.0
	 *
	 * @param array    $additional_user_profile_data {
	 *     An array of name-value pairs of additional user data items. Default empty array.
	 *
	 *     @type string $name  The user-facing name of an item name-value pair,e.g. 'IP Address'.
	 *     @type string $value The user-facing value of an item data pair, e.g. '50.60.70.0'.
	 * }
	 * @param WP_User  $user           The user whose data is being exported.
	 * @param string[] $reserved_names An array of reserved names. Any item in `$additional_user_data`
	 *                                 that uses one of these for its `name` will not be included in the export.
	 */
	$_extra_data = apply_filters( 'wp_privacy_additional_user_profile_data', array(), $user, $reserved_names );

	if ( is_array( $_extra_data ) && ! empty( $_extra_data ) ) {
		// Remove items that use reserved names.
		$extra_data = array_filter(
			$_extra_data,
			static function ( $item ) use ( $reserved_names ) {
				return ! in_array( $item['name'], $reserved_names, true );
			}
		);

		if ( count( $extra_data ) !== count( $_extra_data ) ) {
			_doing_it_wrong(
				__FUNCTION__,
				sprintf(
					/* translators: %s: wp_privacy_additional_user_profile_data */
					__( 'Filter %s returned items with reserved names.' ),
					'<code>wp_privacy_additional_user_profile_data</code>'
				),
				'5.4.0'
			);
		}

		if ( ! empty( $extra_data ) ) {
			$user_data_to_export = array_merge( $user_data_to_export, $extra_data );
		}
	}

	$data_to_export[] = array(
		'group_id'          => 'user',
		'group_label'       => __( 'User' ),
		'group_description' => __( 'User&#8217;s profile data.' ),
		'item_id'           => "user-{$user->ID}",
		'data'              => $user_data_to_export,
	);

	if ( isset( $user_meta['community-events-location'] ) ) {
		$location = maybe_unserialize( $user_meta['community-events-location'][0] );

		$location_props_to_export = array(
			'description' => __( 'City' ),
			'country'     => __( 'Country' ),
			'latitude'    => __( 'Latitude' ),
			'longitude'   => __( 'Longitude' ),
			'ip'          => __( 'IP' ),
		);

		$location_data_to_export = array();

		foreach ( $location_props_to_export as $key => $name ) {
			if ( ! empty( $location[ $key ] ) ) {
				$location_data_to_export[] = array(
					'name'  => $name,
					'value' => $location[ $key ],
				);
			}
		}

		$data_to_export[] = array(
			'group_id'          => 'community-events-location',
			'group_label'       => __( 'Community Events Location' ),
			'group_description' => __( 'User&#8217;s location data used for the Community Events in the WordPress Events and News dashboard widget.' ),
			'item_id'           => "community-events-location-{$user->ID}",
			'data'              => $location_data_to_export,
		);
	}

	if ( isset( $user_meta['session_tokens'] ) ) {
		$session_tokens = maybe_unserialize( $user_meta['session_tokens'][0] );

		$session_tokens_props_to_export = array(
			'expiration' => __( 'Expiration' ),
			'ip'         => __( 'IP' ),
			'ua'         => __( 'User Agent' ),
			'login'      => __( 'Last Login' ),
		);

		foreach ( $session_tokens as $token_key => $session_token ) {
			$session_tokens_data_to_export = array();

			foreach ( $session_tokens_props_to_export as $key => $name ) {
				if ( ! empty( $session_token[ $key ] ) ) {
					$value = $session_token[ $key ];
					if ( in_array( $key, array( 'expiration', 'login' ), true ) ) {
						$value = date_i18n( 'F d, Y H:i A', $value );
					}
					$session_tokens_data_to_export[] = array(
						'name'  => $name,
						'value' => $value,
					);
				}
			}

			$data_to_export[] = array(
				'group_id'          => 'session-tokens',
				'group_label'       => __( 'Session Tokens' ),
				'group_description' => __( 'User&#8217;s Session Tokens data.' ),
				'item_id'           => "session-tokens-{$user->ID}-{$token_key}",
				'data'              => $session_tokens_data_to_export,
			);
		}
	}

	return array(
		'data' => $data_to_export,
		'done' => true,
	);
}

/**
 * Updates log when privacy request is confirmed.
 *
 * @since 4.9.6
 * @access private
 *
 * @param int $request_id ID of the request.
 */
function _wp_privacy_account_request_confirmed( $request_id ) {
	$request = wp_get_user_request( $request_id );

	if ( ! $request ) {
		return;
	}

	if ( ! in_array( $request->status, array( 'request-pending', 'request-failed' ), true ) ) {
		return;
	}

	update_post_meta( $request_id, '_wp_user_request_confirmed_timestamp', time() );
	wp_update_post(
		array(
			'ID'          => $request_id,
			'post_status' => 'request-confirmed',
		)
	);
}

/**
 * Notifies the site administrator via email when a request is confirmed.
 *
 * Without this, the admin would have to manually check the site to see if any
 * action was needed on their part yet.
 *
 * @since 4.9.6
 *
 * @param int $request_id The ID of the request.
 */
function _wp_privacy_send_request_confirmation_notification( $request_id ) {
	$request = wp_get_user_request( $request_id );

	if ( ! ( $request instanceof WP_User_Request ) || 'request-confirmed' !== $request->status ) {
		return;
	}

	$already_notified = (bool) get_post_meta( $request_id, '_wp_admin_notified', true );

	if ( $already_notified ) {
		return;
	}

	if ( 'export_personal_data' === $request->action_name ) {
		$manage_url = admin_url( 'export-personal-data.php' );
	} elseif ( 'remove_personal_data' === $request->action_name ) {
		$manage_url = admin_url( 'erase-personal-data.php' );
	}
	$action_description = wp_user_request_action_description( $request->action_name );

	/**
	 * Filters the recipient of the data request confirmation notification.
	 *
	 * In a Multisite environment, this will default to the email address of the
	 * network admin because, by default, single site admins do not have the
	 * capabilities required to process requests. Some networks may wish to
	 * delegate those capabilities to a single-site admin, or a dedicated person
	 * responsible for managing privacy requests.
	 *
	 * @since 4.9.6
	 *
	 * @param string          $admin_email The email address of the notification recipient.
	 * @param WP_User_Request $request     The request that is initiating the notification.
	 */
	$admin_email = apply_filters( 'user_request_confirmed_email_to', get_site_option( 'admin_email' ), $request );

	$email_data = array(
		'request'     => $request,
		'user_email'  => $request->email,
		'description' => $action_description,
		'manage_url'  => $manage_url,
		'sitename'    => wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ),
		'siteurl'     => home_url(),
		'admin_email' => $admin_email,
	);

	$subject = sprintf(
		/* translators: Privacy data request confirmed notification email subject. 1: Site title, 2: Name of the confirmed action. */
		__( '[%1$s] Action Confirmed: %2$s' ),
		$email_data['sitename'],
		$action_description
	);

	/**
	 * Filters the subject of the user request confirmation email.
	 *
	 * @since 4.9.8
	 *
	 * @param string $subject    The email subject.
	 * @param string $sitename   The name of the site.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $user_email  The email address confirming a request
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $manage_url  The link to click manage privacy requests of this type.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 *     @type string          $admin_email The administrator email receiving the mail.
	 * }
	 */
	$subject = apply_filters( 'user_request_confirmed_email_subject', $subject, $email_data['sitename'], $email_data );

	/* translators: Do not translate SITENAME, USER_EMAIL, DESCRIPTION, MANAGE_URL, SITEURL; those are placeholders. */
	$content = __(
		'Howdy,

A user data privacy request has been confirmed on ###SITENAME###:

User: ###USER_EMAIL###
Request: ###DESCRIPTION###

You can view and manage these data privacy requests here:

###MANAGE_URL###

Regards,
All at ###SITENAME###
###SITEURL###'
	);

	/**
	 * Filters the body of the user request confirmation email.
	 *
	 * The email is sent to an administrator when a user request is confirmed.
	 *
	 * The following strings have a special meaning and will get replaced dynamically:
	 *
	 * ###SITENAME###    The name of the site.
	 * ###USER_EMAIL###  The user email for the request.
	 * ###DESCRIPTION### Description of the action being performed so the user knows what the email is for.
	 * ###MANAGE_URL###  The URL to manage requests.
	 * ###SITEURL###     The URL to the site.
	 *
	 * @since 4.9.6
	 * @deprecated 5.8.0 Use {@see 'user_request_confirmed_email_content'} instead.
	 *                   For user erasure fulfillment email content
	 *                   use {@see 'user_erasure_fulfillment_email_content'} instead.
	 *
	 * @param string $content    The email content.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $user_email  The email address confirming a request
	 *     @type string          $description Description of the action being performed
	 *                                        so the user knows what the email is for.
	 *     @type string          $manage_url  The link to click manage privacy requests of this type.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 *     @type string          $admin_email The administrator email receiving the mail.
	 * }
	 */
	$content = apply_filters_deprecated(
		'user_confirmed_action_email_content',
		array( $content, $email_data ),
		'5.8.0',
		sprintf(
			/* translators: 1 & 2: Deprecation replacement options. */
			__( '%1$s or %2$s' ),
			'user_request_confirmed_email_content',
			'user_erasure_fulfillment_email_content'
		)
	);

	/**
	 * Filters the body of the user request confirmation email.
	 *
	 * The email is sent to an administrator when a user request is confirmed.
	 * The following strings have a special meaning and will get replaced dynamically:
	 *
	 * ###SITENAME###    The name of the site.
	 * ###USER_EMAIL###  The user email for the request.
	 * ###DESCRIPTION### Description of the action being performed so the user knows what the email is for.
	 * ###MANAGE_URL###  The URL to manage requests.
	 * ###SITEURL###     The URL to the site.
	 *
	 * @since 5.8.0
	 *
	 * @param string $content    The email content.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $user_email  The email address confirming a request
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $manage_url  The link to click manage privacy requests of this type.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 *     @type string          $admin_email The administrator email receiving the mail.
	 * }
	 */
	$content = apply_filters( 'user_request_confirmed_email_content', $content, $email_data );

	$content = str_replace( '###SITENAME###', $email_data['sitename'], $content );
	$content = str_replace( '###USER_EMAIL###', $email_data['user_email'], $content );
	$content = str_replace( '###DESCRIPTION###', $email_data['description'], $content );
	$content = str_replace( '###MANAGE_URL###', sanitize_url( $email_data['manage_url'] ), $content );
	$content = str_replace( '###SITEURL###', sanitize_url( $email_data['siteurl'] ), $content );

	$headers = '';

	/**
	 * Filters the headers of the user request confirmation email.
	 *
	 * @since 5.4.0
	 *
	 * @param string|array $headers    The email headers.
	 * @param string       $subject    The email subject.
	 * @param string       $content    The email content.
	 * @param int          $request_id The request ID.
	 * @param array        $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $user_email  The email address confirming a request
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $manage_url  The link to click manage privacy requests of this type.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 *     @type string          $admin_email The administrator email receiving the mail.
	 * }
	 */
	$headers = apply_filters( 'user_request_confirmed_email_headers', $headers, $subject, $content, $request_id, $email_data );

	$email_sent = wp_mail( $email_data['admin_email'], $subject, $content, $headers );

	if ( $email_sent ) {
		update_post_meta( $request_id, '_wp_admin_notified', true );
	}
}

/**
 * Notifies the user when their erasure request is fulfilled.
 *
 * Without this, the user would never know if their data was actually erased.
 *
 * @since 4.9.6
 *
 * @param int $request_id The privacy request post ID associated with this request.
 */
function _wp_privacy_send_erasure_fulfillment_notification( $request_id ) {
	$request = wp_get_user_request( $request_id );

	if ( ! ( $request instanceof WP_User_Request ) || 'request-completed' !== $request->status ) {
		return;
	}

	$already_notified = (bool) get_post_meta( $request_id, '_wp_user_notified', true );

	if ( $already_notified ) {
		return;
	}

	// Localize message content for user; fallback to site default for visitors.
	if ( ! empty( $request->user_id ) ) {
		$switched_locale = switch_to_user_locale( $request->user_id );
	} else {
		$switched_locale = switch_to_locale( get_locale() );
	}

	/**
	 * Filters the recipient of the data erasure fulfillment notification.
	 *
	 * @since 4.9.6
	 *
	 * @param string          $user_email The email address of the notification recipient.
	 * @param WP_User_Request $request    The request that is initiating the notification.
	 */
	$user_email = apply_filters( 'user_erasure_fulfillment_email_to', $request->email, $request );

	$email_data = array(
		'request'            => $request,
		'message_recipient'  => $user_email,
		'privacy_policy_url' => get_privacy_policy_url(),
		'sitename'           => wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ),
		'siteurl'            => home_url(),
	);

	$subject = sprintf(
		/* translators: Erasure request fulfilled notification email subject. %s: Site title. */
		__( '[%s] Erasure Request Fulfilled' ),
		$email_data['sitename']
	);

	/**
	 * Filters the subject of the email sent when an erasure request is completed.
	 *
	 * @since 4.9.8
	 * @deprecated 5.8.0 Use {@see 'user_erasure_fulfillment_email_subject'} instead.
	 *
	 * @param string $subject    The email subject.
	 * @param string $sitename   The name of the site.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$subject = apply_filters_deprecated(
		'user_erasure_complete_email_subject',
		array( $subject, $email_data['sitename'], $email_data ),
		'5.8.0',
		'user_erasure_fulfillment_email_subject'
	);

	/**
	 * Filters the subject of the email sent when an erasure request is completed.
	 *
	 * @since 5.8.0
	 *
	 * @param string $subject    The email subject.
	 * @param string $sitename   The name of the site.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$subject = apply_filters( 'user_erasure_fulfillment_email_subject', $subject, $email_data['sitename'], $email_data );

	/* translators: Do not translate SITENAME, SITEURL; those are placeholders. */
	$content = __(
		'Howdy,

Your request to erase your personal data on ###SITENAME### has been completed.

If you have any follow-up questions or concerns, please contact the site administrator.

Regards,
All at ###SITENAME###
###SITEURL###'
	);

	if ( ! empty( $email_data['privacy_policy_url'] ) ) {
		/* translators: Do not translate SITENAME, SITEURL, PRIVACY_POLICY_URL; those are placeholders. */
		$content = __(
			'Howdy,

Your request to erase your personal data on ###SITENAME### has been completed.

If you have any follow-up questions or concerns, please contact the site administrator.

For more information, you can also read our privacy policy: ###PRIVACY_POLICY_URL###

Regards,
All at ###SITENAME###
###SITEURL###'
		);
	}

	/**
	 * Filters the body of the data erasure fulfillment notification.
	 *
	 * The email is sent to a user when their data erasure request is fulfilled
	 * by an administrator.
	 *
	 * The following strings have a special meaning and will get replaced dynamically:
	 *
	 * ###SITENAME###           The name of the site.
	 * ###PRIVACY_POLICY_URL### Privacy policy page URL.
	 * ###SITEURL###            The URL to the site.
	 *
	 * @since 4.9.6
	 * @deprecated 5.8.0 Use {@see 'user_erasure_fulfillment_email_content'} instead.
	 *                   For user request confirmation email content
	 *                   use {@see 'user_request_confirmed_email_content'} instead.
	 *
	 * @param string $content The email content.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$content = apply_filters_deprecated(
		'user_confirmed_action_email_content',
		array( $content, $email_data ),
		'5.8.0',
		sprintf(
			/* translators: 1 & 2: Deprecation replacement options. */
			__( '%1$s or %2$s' ),
			'user_erasure_fulfillment_email_content',
			'user_request_confirmed_email_content'
		)
	);

	/**
	 * Filters the body of the data erasure fulfillment notification.
	 *
	 * The email is sent to a user when their data erasure request is fulfilled
	 * by an administrator.
	 *
	 * The following strings have a special meaning and will get replaced dynamically:
	 *
	 * ###SITENAME###           The name of the site.
	 * ###PRIVACY_POLICY_URL### Privacy policy page URL.
	 * ###SITEURL###            The URL to the site.
	 *
	 * @since 5.8.0
	 *
	 * @param string $content The email content.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$content = apply_filters( 'user_erasure_fulfillment_email_content', $content, $email_data );

	$content = str_replace( '###SITENAME###', $email_data['sitename'], $content );
	$content = str_replace( '###PRIVACY_POLICY_URL###', $email_data['privacy_policy_url'], $content );
	$content = str_replace( '###SITEURL###', sanitize_url( $email_data['siteurl'] ), $content );

	$headers = '';

	/**
	 * Filters the headers of the data erasure fulfillment notification.
	 *
	 * @since 5.4.0
	 * @deprecated 5.8.0 Use {@see 'user_erasure_fulfillment_email_headers'} instead.
	 *
	 * @param string|array $headers    The email headers.
	 * @param string       $subject    The email subject.
	 * @param string       $content    The email content.
	 * @param int          $request_id The request ID.
	 * @param array        $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$headers = apply_filters_deprecated(
		'user_erasure_complete_email_headers',
		array( $headers, $subject, $content, $request_id, $email_data ),
		'5.8.0',
		'user_erasure_fulfillment_email_headers'
	);

	/**
	 * Filters the headers of the data erasure fulfillment notification.
	 *
	 * @since 5.8.0
	 *
	 * @param string|array $headers    The email headers.
	 * @param string       $subject    The email subject.
	 * @param string       $content    The email content.
	 * @param int          $request_id The request ID.
	 * @param array        $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request            User request object.
	 *     @type string          $message_recipient  The address that the email will be sent to. Defaults
	 *                                               to the value of `$request->email`, but can be changed
	 *                                               by the `user_erasure_fulfillment_email_to` filter.
	 *     @type string          $privacy_policy_url Privacy policy URL.
	 *     @type string          $sitename           The site name sending the mail.
	 *     @type string          $siteurl            The site URL sending the mail.
	 * }
	 */
	$headers = apply_filters( 'user_erasure_fulfillment_email_headers', $headers, $subject, $content, $request_id, $email_data );

	$email_sent = wp_mail( $user_email, $subject, $content, $headers );

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	if ( $email_sent ) {
		update_post_meta( $request_id, '_wp_user_notified', true );
	}
}

/**
 * Returns request confirmation message HTML.
 *
 * @since 4.9.6
 * @access private
 *
 * @param int $request_id The request ID being confirmed.
 * @return string The confirmation message.
 */
function _wp_privacy_account_request_confirmed_message( $request_id ) {
	$request = wp_get_user_request( $request_id );

	$message  = '<p class="success">' . __( 'Action has been confirmed.' ) . '</p>';
	$message .= '<p>' . __( 'The site administrator has been notified and will fulfill your request as soon as possible.' ) . '</p>';

	if ( $request && in_array( $request->action_name, _wp_privacy_action_request_types(), true ) ) {
		if ( 'export_personal_data' === $request->action_name ) {
			$message  = '<p class="success">' . __( 'Thanks for confirming your export request.' ) . '</p>';
			$message .= '<p>' . __( 'The site administrator has been notified. You will receive a link to download your export via email when they fulfill your request.' ) . '</p>';
		} elseif ( 'remove_personal_data' === $request->action_name ) {
			$message  = '<p class="success">' . __( 'Thanks for confirming your erasure request.' ) . '</p>';
			$message .= '<p>' . __( 'The site administrator has been notified. You will receive an email confirmation when they erase your data.' ) . '</p>';
		}
	}

	/**
	 * Filters the message displayed to a user when they confirm a data request.
	 *
	 * @since 4.9.6
	 *
	 * @param string $message    The message to the user.
	 * @param int    $request_id The ID of the request being confirmed.
	 */
	$message = apply_filters( 'user_request_action_confirmed_message', $message, $request_id );

	return $message;
}

/**
 * Creates and logs a user request to perform a specific action.
 *
 * Requests are stored inside a post type named `user_request` since they can apply to both
 * users on the site, or guests without a user account.
 *
 * @since 4.9.6
 * @since 5.7.0 Added the `$status` parameter.
 *
 * @param string $email_address           User email address. This can be the address of a registered
 *                                        or non-registered user.
 * @param string $action_name             Name of the action that is being confirmed. Required.
 * @param array  $request_data            Misc data you want to send with the verification request and pass
 *                                        to the actions once the request is confirmed.
 * @param string $status                  Optional request status (pending or confirmed). Default 'pending'.
 * @return int|WP_Error                   Returns the request ID if successful, or a WP_Error object on failure.
 */
function wp_create_user_request( $email_address = '', $action_name = '', $request_data = array(), $status = 'pending' ) {
	$email_address = sanitize_email( $email_address );
	$action_name   = sanitize_key( $action_name );

	if ( ! is_email( $email_address ) ) {
		return new WP_Error( 'invalid_email', __( 'Invalid email address.' ) );
	}

	if ( ! in_array( $action_name, _wp_privacy_action_request_types(), true ) ) {
		return new WP_Error( 'invalid_action', __( 'Invalid action name.' ) );
	}

	if ( ! in_array( $status, array( 'pending', 'confirmed' ), true ) ) {
		return new WP_Error( 'invalid_status', __( 'Invalid request status.' ) );
	}

	$user    = get_user_by( 'email', $email_address );
	$user_id = $user && ! is_wp_error( $user ) ? $user->ID : 0;

	// Check for duplicates.
	$requests_query = new WP_Query(
		array(
			'post_type'     => 'user_request',
			'post_name__in' => array( $action_name ), // Action name stored in post_name column.
			'title'         => $email_address,        // Email address stored in post_title column.
			'post_status'   => array(
				'request-pending',
				'request-confirmed',
			),
			'fields'        => 'ids',
		)
	);

	if ( $requests_query->found_posts ) {
		return new WP_Error( 'duplicate_request', __( 'An incomplete personal data request for this email address already exists.' ) );
	}

	$request_id = wp_insert_post(
		array(
			'post_author'   => $user_id,
			'post_name'     => $action_name,
			'post_title'    => $email_address,
			'post_content'  => wp_json_encode( $request_data ),
			'post_status'   => 'request-' . $status,
			'post_type'     => 'user_request',
			'post_date'     => current_time( 'mysql', false ),
			'post_date_gmt' => current_time( 'mysql', true ),
		),
		true
	);

	return $request_id;
}

/**
 * Gets action description from the name and return a string.
 *
 * @since 4.9.6
 *
 * @param string $action_name Action name of the request.
 * @return string Human readable action name.
 */
function wp_user_request_action_description( $action_name ) {
	switch ( $action_name ) {
		case 'export_personal_data':
			$description = __( 'Export Personal Data' );
			break;
		case 'remove_personal_data':
			$description = __( 'Erase Personal Data' );
			break;
		default:
			/* translators: %s: Action name. */
			$description = sprintf( __( 'Confirm the "%s" action' ), $action_name );
			break;
	}

	/**
	 * Filters the user action description.
	 *
	 * @since 4.9.6
	 *
	 * @param string $description The default description.
	 * @param string $action_name The name of the request.
	 */
	return apply_filters( 'user_request_action_description', $description, $action_name );
}

/**
 * Send a confirmation request email to confirm an action.
 *
 * If the request is not already pending, it will be updated.
 *
 * @since 4.9.6
 *
 * @param string $request_id ID of the request created via wp_create_user_request().
 * @return true|WP_Error True on success, `WP_Error` on failure.
 */
function wp_send_user_request( $request_id ) {
	$request_id = absint( $request_id );
	$request    = wp_get_user_request( $request_id );

	if ( ! $request ) {
		return new WP_Error( 'invalid_request', __( 'Invalid personal data request.' ) );
	}

	// Localize message content for user; fallback to site default for visitors.
	if ( ! empty( $request->user_id ) ) {
		$switched_locale = switch_to_user_locale( $request->user_id );
	} else {
		$switched_locale = switch_to_locale( get_locale() );
	}

	$email_data = array(
		'request'     => $request,
		'email'       => $request->email,
		'description' => wp_user_request_action_description( $request->action_name ),
		'confirm_url' => add_query_arg(
			array(
				'action'      => 'confirmaction',
				'request_id'  => $request_id,
				'confirm_key' => wp_generate_user_request_key( $request_id ),
			),
			wp_login_url()
		),
		'sitename'    => wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ),
		'siteurl'     => home_url(),
	);

	/* translators: Confirm privacy data request notification email subject. 1: Site title, 2: Name of the action. */
	$subject = sprintf( __( '[%1$s] Confirm Action: %2$s' ), $email_data['sitename'], $email_data['description'] );

	/**
	 * Filters the subject of the email sent when an account action is attempted.
	 *
	 * @since 4.9.6
	 *
	 * @param string $subject    The email subject.
	 * @param string $sitename   The name of the site.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $email       The email address this is being sent to.
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $confirm_url The link to click on to confirm the account action.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 * }
	 */
	$subject = apply_filters( 'user_request_action_email_subject', $subject, $email_data['sitename'], $email_data );

	/* translators: Do not translate DESCRIPTION, CONFIRM_URL, SITENAME, SITEURL: those are placeholders. */
	$content = __(
		'Howdy,

A request has been made to perform the following action on your account:

     ###DESCRIPTION###

To confirm this, please click on the following link:
###CONFIRM_URL###

You can safely ignore and delete this email if you do not want to
take this action.

Regards,
All at ###SITENAME###
###SITEURL###'
	);

	/**
	 * Filters the text of the email sent when an account action is attempted.
	 *
	 * The following strings have a special meaning and will get replaced dynamically:
	 *
	 * ###DESCRIPTION### Description of the action being performed so the user knows what the email is for.
	 * ###CONFIRM_URL### The link to click on to confirm the account action.
	 * ###SITENAME###    The name of the site.
	 * ###SITEURL###     The URL to the site.
	 *
	 * @since 4.9.6
	 *
	 * @param string $content Text in the email.
	 * @param array  $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $email       The email address this is being sent to.
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $confirm_url The link to click on to confirm the account action.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 * }
	 */
	$content = apply_filters( 'user_request_action_email_content', $content, $email_data );

	$content = str_replace( '###DESCRIPTION###', $email_data['description'], $content );
	$content = str_replace( '###CONFIRM_URL###', sanitize_url( $email_data['confirm_url'] ), $content );
	$content = str_replace( '###EMAIL###', $email_data['email'], $content );
	$content = str_replace( '###SITENAME###', $email_data['sitename'], $content );
	$content = str_replace( '###SITEURL###', sanitize_url( $email_data['siteurl'] ), $content );

	$headers = '';

	/**
	 * Filters the headers of the email sent when an account action is attempted.
	 *
	 * @since 5.4.0
	 *
	 * @param string|array $headers    The email headers.
	 * @param string       $subject    The email subject.
	 * @param string       $content    The email content.
	 * @param int          $request_id The request ID.
	 * @param array        $email_data {
	 *     Data relating to the account action email.
	 *
	 *     @type WP_User_Request $request     User request object.
	 *     @type string          $email       The email address this is being sent to.
	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
	 *     @type string          $confirm_url The link to click on to confirm the account action.
	 *     @type string          $sitename    The site name sending the mail.
	 *     @type string          $siteurl     The site URL sending the mail.
	 * }
	 */
	$headers = apply_filters( 'user_request_action_email_headers', $headers, $subject, $content, $request_id, $email_data );

	$email_sent = wp_mail( $email_data['email'], $subject, $content, $headers );

	if ( $switched_locale ) {
		restore_previous_locale();
	}

	if ( ! $email_sent ) {
		return new WP_Error( 'privacy_email_error', __( 'Unable to send personal data export confirmation email.' ) );
	}

	return true;
}

/**
 * Returns a confirmation key for a user action and stores the hashed version for future comparison.
 *
 * @since 4.9.6
 *
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
 *
 * @param int $request_id Request ID.
 * @return string Confirmation key.
 */
function wp_generate_user_request_key( $request_id ) {
	global $wp_hasher;

	// Generate something random for a confirmation key.
	$key = wp_generate_password( 20, false );

	// Return the key, hashed.
	if ( empty( $wp_hasher ) ) {
		require_once ABSPATH . WPINC . '/class-phpass.php';
		$wp_hasher = new PasswordHash( 8, true );
	}

	wp_update_post(
		array(
			'ID'            => $request_id,
			'post_status'   => 'request-pending',
			'post_password' => $wp_hasher->HashPassword( $key ),
		)
	);

	return $key;
}

/**
 * Validates a user request by comparing the key with the request's key.
 *
 * @since 4.9.6
 *
 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
 *
 * @param string $request_id ID of the request being confirmed.
 * @param string $key        Provided key to validate.
 * @return true|WP_Error True on success, WP_Error on failure.
 */
function wp_validate_user_request_key( $request_id, $key ) {
	global $wp_hasher;

	$request_id       = absint( $request_id );
	$request          = wp_get_user_request( $request_id );
	$saved_key        = $request->confirm_key;
	$key_request_time = $request->modified_timestamp;

	if ( ! $request || ! $saved_key || ! $key_request_time ) {
		return new WP_Error( 'invalid_request', __( 'Invalid personal data request.' ) );
	}

	if ( ! in_array( $request->status, array( 'request-pending', 'request-failed' ), true ) ) {
		return new WP_Error( 'expired_request', __( 'This personal data request has expired.' ) );
	}

	if ( empty( $key ) ) {
		return new WP_Error( 'missing_key', __( 'The confirmation key is missing from this personal data request.' ) );
	}

	if ( empty( $wp_hasher ) ) {
		require_once ABSPATH . WPINC . '/class-phpass.php';
		$wp_hasher = new PasswordHash( 8, true );
	}

	/**
	 * Filters the expiration time of confirm keys.
	 *
	 * @since 4.9.6
	 *
	 * @param int $expiration The expiration time in seconds.
	 */
	$expiration_duration = (int) apply_filters( 'user_request_key_expiration', DAY_IN_SECONDS );
	$expiration_time     = $key_request_time + $expiration_duration;

	if ( ! $wp_hasher->CheckPassword( $key, $saved_key ) ) {
		return new WP_Error( 'invalid_key', __( 'The confirmation key is invalid for this personal data request.' ) );
	}

	if ( ! $expiration_time || time() > $expiration_time ) {
		return new WP_Error( 'expired_key', __( 'The confirmation key has expired for this personal data request.' ) );
	}

	return true;
}

/**
 * Returns the user request object for the specified request ID.
 *
 * @since 4.9.6
 *
 * @param int $request_id The ID of the user request.
 * @return WP_User_Request|false
 */
function wp_get_user_request( $request_id ) {
	$request_id = absint( $request_id );
	$post       = get_post( $request_id );

	if ( ! $post || 'user_request' !== $post->post_type ) {
		return false;
	}

	return new WP_User_Request( $post );
}

/**
 * Checks if Application Passwords is supported.
 *
 * Application Passwords is supported only by sites using SSL or local environments
 * but may be made available using the {@see 'wp_is_application_passwords_available'} filter.
 *
 * @since 5.9.0
 *
 * @return bool
 */
function wp_is_application_passwords_supported() {
	return is_ssl() || 'local' === wp_get_environment_type();
}

/**
 * Checks if Application Passwords is globally available.
 *
 * By default, Application Passwords is available to all sites using SSL or to local environments.
 * Use the {@see 'wp_is_application_passwords_available'} filter to adjust its availability.
 *
 * @since 5.6.0
 *
 * @return bool
 */
function wp_is_application_passwords_available() {
	/**
	 * Filters whether Application Passwords is available.
	 *
	 * @since 5.6.0
	 *
	 * @param bool $available True if available, false otherwise.
	 */
	return apply_filters( 'wp_is_application_passwords_available', wp_is_application_passwords_supported() );
}

/**
 * Checks if Application Passwords is available for a specific user.
 *
 * By default all users can use Application Passwords. Use {@see 'wp_is_application_passwords_available_for_user'}
 * to restrict availability to certain users.
 *
 * @since 5.6.0
 *
 * @param int|WP_User $user The user to check.
 * @return bool
 */
function wp_is_application_passwords_available_for_user( $user ) {
	if ( ! wp_is_application_passwords_available() ) {
		return false;
	}

	if ( ! is_object( $user ) ) {
		$user = get_userdata( $user );
	}

	if ( ! $user || ! $user->exists() ) {
		return false;
	}

	/**
	 * Filters whether Application Passwords is available for a specific user.
	 *
	 * @since 5.6.0
	 *
	 * @param bool    $available True if available, false otherwise.
	 * @param WP_User $user      The user to check.
	 */
	return apply_filters( 'wp_is_application_passwords_available_for_user', true, $user );
}

/**
 * Registers the user meta property for persisted preferences.
 *
 * This property is used to store user preferences across page reloads and is
 * currently used by the block editor for preferences like 'fullscreenMode' and
 * 'fixedToolbar'.
 *
 * @since 6.1.0
 * @access private
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 */
function wp_register_persisted_preferences_meta() {
	/*
	 * Create a meta key that incorporates the blog prefix so that each site
	 * on a multisite can have distinct user preferences.
	 */
	global $wpdb;
	$meta_key = $wpdb->get_blog_prefix() . 'persisted_preferences';

	register_meta(
		'user',
		$meta_key,
		array(
			'type'         => 'object',
			'single'       => true,
			'show_in_rest' => array(
				'name'   => 'persisted_preferences',
				'type'   => 'object',
				'schema' => array(
					'type'                 => 'object',
					'context'              => array( 'edit' ),
					'properties'           => array(
						'_modified' => array(
							'description' => __( 'The date and time the preferences were updated.' ),
							'type'        => 'string',
							'format'      => 'date-time',
							'readonly'    => false,
						),
					),
					'additionalProperties' => true,
				),
			),
		)
	);
}

/**
 * Sets the last changed time for the 'users' cache group.
 *
 * @since 6.3.0
 */
function wp_cache_set_users_last_changed() {
	wp_cache_set_last_changed( 'users' );
}

/**
 * Checks if password reset is allowed for a specific user.
 *
 * @since 6.3.0
 *
 * @param int|WP_User $user The user to check.
 * @return bool|WP_Error True if allowed, false or WP_Error otherwise.
 */
function wp_is_password_reset_allowed_for_user( $user ) {
	if ( ! is_object( $user ) ) {
		$user = get_userdata( $user );
	}

	if ( ! $user || ! $user->exists() ) {
		return false;
	}
	$allow = true;
	if ( is_multisite() && is_user_spammy( $user ) ) {
		$allow = false;
	}

	/**
	 * Filters whether to allow a password to be reset.
	 *
	 * @since 2.7.0
	 *
	 * @param bool $allow   Whether to allow the password to be reset. Default true.
	 * @param int  $user_id The ID of the user attempting to reset a password.
	 */
	return apply_filters( 'allow_password_reset', $allow, $user->ID );
}
ct          $data_object Data model like WP_Term or WP_Post.
	 * @param WP_REST_Request $request     Full details about the request.
	 * @return true|WP_Error True on success, WP_Error object if a field cannot be updated.
	 */
	protected function update_additional_fields_for_object( $data_object, $request ) {
		$additional_fields = $this->get_additional_fields();

		foreach ( $additional_fields as $field_name => $field_options ) {
			if ( ! $field_options['update_callback'] ) {
				continue;
			}

			// Don't run the update callbacks if the data wasn't passed in the request.
			if ( ! isset( $request[ $field_name ] ) ) {
				continue;
			}

			$result = call_user_func(
				$field_options['update_callback'],
				$request[ $field_name ],
				$data_object,
				$field_name,
				$request,
				$this->get_object_type()
			);

			if ( is_wp_error( $result ) ) {
				return $result;
			}
		}

		return true;
	}

	/**
	 * Adds the schema from additional fields to a schema array.
	 *
	 * The type of object is inferred from the passed schema.
	 *
	 * @since 4.7.0
	 *
	 * @param array $schema Schema array.
	 * @return array Modified Schema array.
	 */
	protected function add_additional_fields_schema( $schema ) {
		if ( empty( $schema['title'] ) ) {
			return $schema;
		}

		// Can't use $this->get_object_type otherwise we cause an inf loop.
		$object_type = $schema['title'];

		$additional_fields = $this->get_additional_fields( $object_type );

		foreach ( $additional_fields as $field_name => $field_options ) {
			if ( ! $field_options['schema'] ) {
				continue;
			}

			$schema['properties'][ $field_name ] = $field_options['schema'];
		}

		return $schema;
	}

	/**
	 * Retrieves all of the registered additional fields for a given object-type.
	 *
	 * @since 4.7.0
	 *
	 * @global array $wp_rest_additional_fields Holds registered fields, organized by object type.
	 *
	 * @param string $object_type Optional. The object type.
	 * @return array Registered additional fields (if any), empty array if none or if the object type
	 *               could not be inferred.
	 */
	protected function get_additional_fields( $object_type = null ) {
		global $wp_rest_additional_fields;

		if ( ! $object_type ) {
			$object_type = $this->get_object_type();
		}

		if ( ! $object_type ) {
			return array();
		}

		if ( ! $wp_rest_additional_fields || ! isset( $wp_rest_additional_fields[ $object_type ] ) ) {
			return array();
		}

		return $wp_rest_additional_fields[ $object_type ];
	}

	/**
	 * Retrieves the object type this controller is responsible for managing.
	 *
	 * @since 4.7.0
	 *
	 * @return string Object type for the controller.
	 */
	protected function get_object_type() {
		$schema = $this->get_item_schema();

		if ( ! $schema || ! isset( $schema['title'] ) ) {
			return null;
		}

		return $schema['title'];
	}

	/**
	 * Gets an array of fields to be included on the response.
	 *
	 * Included fields are based on item schema and `_fields=` request argument.
	 *
	 * @since 4.9.6
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return string[] Fields to be included in the response.
	 */
	public function get_fields_for_response( $request ) {
		$schema     = $this->get_item_schema();
		$properties = isset( $schema['properties'] ) ? $schema['properties'] : array();

		$additional_fields = $this->get_additional_fields();

		foreach ( $additional_fields as $field_name => $field_options ) {
			/*
			 * For back-compat, include any field with an empty schema
			 * because it won't be present in $this->get_item_schema().
			 */
			if ( is_null( $field_options['schema'] ) ) {
				$properties[ $field_name ] = $field_options;
			}
		}

		// Exclude fields that specify a different context than the request context.
		$context = $request['context'];
		if ( $context ) {
			foreach ( $properties as $name => $options ) {
				if ( ! empty( $options['context'] ) && ! in_array( $context, $options['context'], true ) ) {
					unset( $properties[ $name ] );
				}
			}
		}

		$fields = array_keys( $properties );

		/*
		 * '_links' and '_embedded' are not typically part of the item schema,
		 * but they can be specified in '_fields', so they are added here as a
		 * convenience for checking with rest_is_field_included().
		 */
		$fields[] = '_links';
		if ( $request->has_param( '_embed' ) ) {
			$fields[] = '_embedded';
		}

		$fields = array_unique( $fields );

		if ( ! isset( $request['_fields'] ) ) {
			return $fields;
		}
		$requested_fields = wp_parse_list( $request['_fields'] );
		if ( 0 === count( $requested_fields ) ) {
			return $fields;
		}
		// Trim off outside whitespace from the comma delimited list.
		$requested_fields = array_map( 'trim', $requested_fields );
		// Always persist 'id', because it can be needed for add_additional_fields_to_object().
		if ( in_array( 'id', $fields, true ) ) {
			$requested_fields[] = 'id';
		}
		// Return the list of all requested fields which appear in the schema.
		return array_reduce(
			$requested_fields,
			static function ( $response_fields, $field ) use ( $fields ) {
				if ( in_array( $field, $fields, true ) ) {
					$response_fields[] = $field;
					return $response_fields;
				}
				// Check for nested fields if $field is not a direct match.
				$nested_fields = explode( '.', $field );
				/*
				 * A nested field is included so long as its top-level property
				 * is present in the schema.
				 */
				if ( in_array( $nested_fields[0], $fields, true ) ) {
					$response_fields[] = $field;
				}
				return $response_fields;
			},
			array()
		);
	}

	/**
	 * Retrieves an array of endpoint arguments from the item schema for the controller.
	 *
	 * @since 4.7.0
	 *
	 * @param string $method Optional. HTTP method of the request. The arguments for `CREATABLE` requests are
	 *                       checked for required values and may fall-back to a given default, this is not done
	 *                       on `EDITABLE` requests. Default WP_REST_Server::CREATABLE.
	 * @return array Endpoint arguments.
	 */
	public function get_endpoint_args_for_item_schema( $method = WP_REST_Server::CREATABLE ) {
		return rest_get_endpoint_args_for_schema( $this->get_item_schema(), $method );
	}

	/**
	 * Sanitizes the slug value.
	 *
	 * @since 4.7.0
	 *
	 * @internal We can't use sanitize_title() directly, as the second
	 * parameter is the fallback title, which would end up being set to the
	 * request object.
	 *
	 * @see https://github.com/WP-API/WP-API/issues/1585
	 *
	 * @todo Remove this in favour of https://core.trac.wordpress.org/ticket/34659
	 *
	 * @param string $slug Slug value passed in request.
	 * @return string Sanitized value for the slug.
	 */
	public function sanitize_slug( $slug ) {
		return sanitize_title( $slug );
	}
}