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/**
 * Parses and formats a MySQL datetime (Y-m-d H:i:s) for ISO8601/RFC3339.
 *
 * Explicitly strips timezones, as datetimes are not saved with any timezone
 * information. Including any information on the offset could be misleading.
 *
 * @since 4.4.0
 *
 * @param string $date_string Date string to parse and format.
 * @return string Date formatted for ISO8601/RFC3339.
 */
function mysql_to_rfc3339( $date_string ) {
	$formatted = mysql2date( 'c', $date_string, false );

	// Strip timezone information
	return preg_replace( '/(?:Z|[+-]\d{2}(?::\d{2})?)$/', '', $formatted );
}

/**
 * Attempts to raise the PHP memory limit for memory intensive processes.
 *
 * Only allows raising the existing limit and prevents lowering it.
 *
 * @since 4.6.0
 *
 * @param string $context Optional. Context in which the function is called. Accepts either 'admin',
 *                        'image', or an arbitrary other context. If an arbitrary context is passed,
 *                        the similarly arbitrary {@see '{$context}_memory_limit'} filter will be
 *                        invoked. Default 'admin'.
 * @return bool|int|string The limit that was set or false on failure.
 */
function wp_raise_memory_limit( $context = 'admin' ) {
	// Exit early if the limit cannot be changed.
	if ( false === wp_is_ini_value_changeable( 'memory_limit' ) ) {
		return false;
	}

	$current_limit     = @ini_get( 'memory_limit' );
	$current_limit_int = wp_convert_hr_to_bytes( $current_limit );

	if ( -1 === $current_limit_int ) {
		return false;
	}

	$wp_max_limit     = WP_MAX_MEMORY_LIMIT;
	$wp_max_limit_int = wp_convert_hr_to_bytes( $wp_max_limit );
	$filtered_limit   = $wp_max_limit;

	switch ( $context ) {
		case 'admin':
			/**
			 * Filters the maximum memory limit available for administration screens.
			 *
			 * This only applies to administrators, who may require more memory for tasks
			 * like updates. Memory limits when processing images (uploaded or edited by
			 * users of any role) are handled separately.
			 *
			 * The `WP_MAX_MEMORY_LIMIT` constant specifically defines the maximum memory
			 * limit available when in the administration back end. The default is 256M
			 * (256 megabytes of memory) or the original `memory_limit` php.ini value if
			 * this is higher.
			 *
			 * @since 3.0.0
			 * @since 4.6.0 The default now takes the original `memory_limit` into account.
			 *
			 * @param int|string $filtered_limit The maximum WordPress memory limit. Accepts an integer
			 *                                   (bytes), or a shorthand string notation, such as '256M'.
			 */
			$filtered_limit = apply_filters( 'admin_memory_limit', $filtered_limit );
			break;

		case 'image':
			/**
			 * Filters the memory limit allocated for image manipulation.
			 *
			 * @since 3.5.0
			 * @since 4.6.0 The default now takes the original `memory_limit` into account.
			 *
			 * @param int|string $filtered_limit Maximum memory limit to allocate for images.
			 *                                   Default `WP_MAX_MEMORY_LIMIT` or the original
			 *                                   php.ini `memory_limit`, whichever is higher.
			 *                                   Accepts an integer (bytes), or a shorthand string
			 *                                   notation, such as '256M'.
			 */
			$filtered_limit = apply_filters( 'image_memory_limit', $filtered_limit );
			break;

		default:
			/**
			 * Filters the memory limit allocated for arbitrary contexts.
			 *
			 * The dynamic portion of the hook name, `$context`, refers to an arbitrary
			 * context passed on calling the function. This allows for plugins to define
			 * their own contexts for raising the memory limit.
			 *
			 * @since 4.6.0
			 *
			 * @param int|string $filtered_limit Maximum memory limit to allocate for images.
			 *                                   Default '256M' or the original php.ini `memory_limit`,
			 *                                   whichever is higher. Accepts an integer (bytes), or a
			 *                                   shorthand string notation, such as '256M'.
			 */
			$filtered_limit = apply_filters( "{$context}_memory_limit", $filtered_limit );
			break;
	}

	$filtered_limit_int = wp_convert_hr_to_bytes( $filtered_limit );

	if ( -1 === $filtered_limit_int || ( $filtered_limit_int > $wp_max_limit_int && $filtered_limit_int > $current_limit_int ) ) {
		if ( false !== @ini_set( 'memory_limit', $filtered_limit ) ) {
			return $filtered_limit;
		} else {
			return false;
		}
	} elseif ( -1 === $wp_max_limit_int || $wp_max_limit_int > $current_limit_int ) {
		if ( false !== @ini_set( 'memory_limit', $wp_max_limit ) ) {
			return $wp_max_limit;
		} else {
			return false;
		}
	}

	return false;
}

/**
 * Generate a random UUID (version 4).
 *
 * @since 4.7.0
 *
 * @return string UUID.
 */
function wp_generate_uuid4() {
	return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
		mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
		mt_rand( 0, 0xffff ),
		mt_rand( 0, 0x0fff ) | 0x4000,
		mt_rand( 0, 0x3fff ) | 0x8000,
		mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
	);
}

/**
 * Validates that a UUID is valid.
 *
 * @since 4.9.0
 *
 * @param mixed $uuid    UUID to check.
 * @param int   $version Specify which version of UUID to check against. Default is none, to accept any UUID version. Otherwise, only version allowed is `4`.
 * @return bool The string is a valid UUID or false on failure.
 */
function wp_is_uuid( $uuid, $version = null ) {

	if ( ! is_string( $uuid ) ) {
		return false;
	}

	if ( is_numeric( $version ) ) {
		if ( 4 !== (int) $version ) {
			_doing_it_wrong( __FUNCTION__, __( 'Only UUID V4 is supported at this time.' ), '4.9.0' );
			return false;
		}
		$regex = '/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/';
	} else {
		$regex = '/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/';
	}

	return (bool) preg_match( $regex, $uuid );
}

/**
 * Get last changed date for the specified cache group.
 *
 * @since 4.7.0
 *
 * @param string $group Where the cache contents are grouped.
 *
 * @return string $last_changed UNIX timestamp with microseconds representing when the group was last changed.
 */
function wp_cache_get_last_changed( $group ) {
	$last_changed = wp_cache_get( 'last_changed', $group );

	if ( ! $last_changed ) {
		$last_changed = microtime();
		wp_cache_set( 'last_changed', $last_changed, $group );
	}

	return $last_changed;
}

/**
 * Send an email to the old site admin email address when the site admin email address changes.
 *
 * @since 4.9.0
 *
 * @param string $old_email   The old site admin email address.
 * @param string $new_email   The new site admin email address.
 * @param string $option_name The relevant database option name.
 */
function wp_site_admin_email_change_notification( $old_email, $new_email, $option_name ) {
	$send = true;

	// Don't send the notification to the default 'admin_email' value.
	if ( 'you@example.com' === $old_email ) {
		$send = false;
	}

	/**
	 * Filters whether to send the site admin email change notification email.
	 *
	 * @since 4.9.0
	 *
	 * @param bool   $send      Whether to send the email notification.
	 * @param string $old_email The old site admin email address.
	 * @param string $new_email The new site admin email address.
	 */
	$send = apply_filters( 'send_site_admin_email_change_email', $send, $old_email, $new_email );

	if ( ! $send ) {
		return;
	}

	/* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */
	$email_change_text = __( 'Hi,

This notice confirms that the admin email address was changed on ###SITENAME###.

The new admin email address is ###NEW_EMAIL###.

This email has been sent to ###OLD_EMAIL###

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

	$email_change_email = array(
		'to'      => $old_email,
		/* translators: Site admin email change notification email subject. %s: Site title */
		'subject' => __( '[%s] Notice of Admin Email Change' ),
		'message' => $email_change_text,
		'headers' => '',
	);
	// get site name
	$site_name = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	/**
	 * Filters the contents of the email notification sent when the site admin email address is changed.
	 *
	 * @since 4.9.0
	 *
	 * @param array $email_change_email {
	 *            Used to build wp_mail().
	 *
	 *            @type string $to      The intended recipient.
	 *            @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:
	 *                - ###OLD_EMAIL### The old site admin email address.
	 *                - ###NEW_EMAIL### The new site admin email address.
	 *                - ###SITENAME###  The name of the site.
	 *                - ###SITEURL###   The URL to the site.
	 *            @type string $headers Headers.
	 *        }
	 * @param string $old_email The old site admin email address.
	 * @param string $new_email The new site admin email address.
	 */
	$email_change_email = apply_filters( 'site_admin_email_change_email', $email_change_email, $old_email, $new_email );

	$email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email, $email_change_email['message'] );
	$email_change_email['message'] = str_replace( '###SITENAME###',  $site_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'],
		$site_name
	), $email_change_email['message'], $email_change_email['headers'] );
}

/**
 * Return an anonymized IPv4 or IPv6 address.
 *
 * @since 4.9.6 Abstracted from `WP_Community_Events::get_unsafe_client_ip()`.
 *
 * @param  string $ip_addr        The IPv4 or IPv6 address to be anonymized.
 * @param  bool   $ipv6_fallback  Optional. Whether to return the original IPv6 address if the needed functions
 *                                to anonymize it are not present. Default false, return `::` (unspecified address).
 * @return string  The anonymized IP address.
 */
function wp_privacy_anonymize_ip( $ip_addr, $ipv6_fallback = false ) {
	// Detect what kind of IP address this is.
	$ip_prefix = '';
	$is_ipv6   = substr_count( $ip_addr, ':' ) > 1;
	$is_ipv4   = ( 3 === substr_count( $ip_addr, '.' ) );

	if ( $is_ipv6 && $is_ipv4 ) {
		// IPv6 compatibility mode, temporarily strip the IPv6 part, and treat it like IPv4.
		$ip_prefix = '::ffff:';
		$ip_addr   = preg_replace( '/^\[?[0-9a-f:]*:/i', '', $ip_addr );
		$ip_addr   = str_replace( ']', '', $ip_addr );
		$is_ipv6   = false;
	}

	if ( $is_ipv6 ) {
		// IPv6 addresses will always be enclosed in [] if there's a port.
		$left_bracket  = strpos( $ip_addr, '[' );
		$right_bracket = strpos( $ip_addr, ']' );
		$percent       = strpos( $ip_addr, '%' );
		$netmask       = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';

		// Strip the port (and [] from IPv6 addresses), if they exist.
		if ( false !== $left_bracket && false !== $right_bracket ) {
			$ip_addr = substr( $ip_addr, $left_bracket + 1, $right_bracket - $left_bracket - 1 );
		} elseif ( false !== $left_bracket || false !== $right_bracket ) {
			// The IP has one bracket, but not both, so it's malformed.
			return '::';
		}

		// Strip the reachability scope.
		if ( false !== $percent ) {
			$ip_addr = substr( $ip_addr, 0, $percent );
		}

		// No invalid characters should be left.
		if ( preg_match( '/[^0-9a-f:]/i', $ip_addr ) ) {
			return '::';
		}

		// Partially anonymize the IP by reducing it to the corresponding network ID.
		if ( function_exists( 'inet_pton' ) && function_exists( 'inet_ntop' ) ) {
			$ip_addr = inet_ntop( inet_pton( $ip_addr ) & inet_pton( $netmask ) );
			if ( false === $ip_addr) {
				return '::';
			}
		} elseif ( ! $ipv6_fallback ) {
			return '::';
		}
	} elseif ( $is_ipv4 ) {
		// Strip any port and partially anonymize the IP.
		$last_octet_position = strrpos( $ip_addr, '.' );
		$ip_addr             = substr( $ip_addr, 0, $last_octet_position ) . '.0';
	} else {
		return '0.0.0.0';
	}

	// Restore the IPv6 prefix to compatibility mode addresses.
	return $ip_prefix . $ip_addr;
}

/**
 * Return uniform "anonymous" data by type.
 *
 * @since 4.9.6
 *
 * @param  string $type The type of data to be anonymized.
 * @param  string $data Optional The data to be anonymized.
 * @return string The anonymous data for the requested type.
 */
function wp_privacy_anonymize_data( $type, $data = '' ) {

	switch ( $type ) {
		case 'email':
			$anonymous = 'deleted@site.invalid';
			break;
		case 'url':
			$anonymous = 'https://site.invalid';
			break;
		case 'ip':
			$anonymous = wp_privacy_anonymize_ip( $data );
			break;
		case 'date':
			$anonymous = '0000-00-00 00:00:00';
			break;
		case 'text':
			/* translators: deleted text */
			$anonymous = __( '[deleted]' );
			break;
		case 'longtext':
			/* translators: deleted long text */
			$anonymous = __( 'This content was deleted by the author.' );
			break;
		default:
			$anonymous = '';
	}

	/**
	 * Filters the anonymous data for each type.
	 *
	 * @since 4.9.6
	 *
	 * @param string $anonymous Anonymized data.
	 * @param string $type      Type of the data.
	 * @param string $data      Original data.
	 */
	return apply_filters( 'wp_privacy_anonymize_data', $anonymous, $type, $data );
}

/**
 * Returns the directory used to store personal data export files.
 *
 * @since 4.9.6
 *
 * @see wp_privacy_exports_url
 *
 * @return string Exports directory.
 */
function wp_privacy_exports_dir() {
	$upload_dir  = wp_upload_dir();
	$exports_dir = trailingslashit( $upload_dir['basedir'] ) . 'wp-personal-data-exports/';

	/**
	 * Filters the directory used to store personal data export files.
	 *
	 * @since 4.9.6
	 *
	 * @param string $exports_dir Exports directory.
	 */
	return apply_filters( 'wp_privacy_exports_dir', $exports_dir );
}

/**
 * Returns the URL of the directory used to store personal data export files.
 *
 * @since 4.9.6
 *
 * @see wp_privacy_exports_dir
 *
 * @return string Exports directory URL.
 */
function wp_privacy_exports_url() {
	$upload_dir  = wp_upload_dir();
	$exports_url = trailingslashit( $upload_dir['baseurl'] ) . 'wp-personal-data-exports/';

	/**
	 * Filters the URL of the directory used to store personal data export files.
	 *
	 * @since 4.9.6
	 *
	 * @param string $exports_url Exports directory URL.
	 */
	return apply_filters( 'wp_privacy_exports_url', $exports_url );
}

/**
 * Schedule a `WP_Cron` job to delete expired export files.
 *
 * @since 4.9.6
 */
function wp_schedule_delete_old_privacy_export_files() {
	if ( wp_installing() ) {
		return;
	}

	if ( ! wp_next_scheduled( 'wp_privacy_delete_old_export_files' ) ) {
		wp_schedule_event( time(), 'hourly', 'wp_privacy_delete_old_export_files' );
	}
}

/**
 * Cleans up export files older than three days old.
 *
 * The export files are stored in `wp-content/uploads`, and are therefore publicly
 * accessible. A CSPRN is appended to the filename to mitigate the risk of an
 * unauthorized person downloading the file, but it is still possible. Deleting
 * the file after the data subject has had a chance to delete it adds an additional
 * layer of protection.
 *
 * @since 4.9.6
 */
function wp_privacy_delete_old_export_files() {
	require_once( ABSPATH . 'wp-admin/includes/file.php' );

	$exports_dir  = wp_privacy_exports_dir();
	$export_files = list_files( $exports_dir, 100, array( 'index.html' ) );

	/**
	 * Filters the lifetime, in seconds, of a personal data export file.
	 *
	 * By default, the lifetime is 3 days. Once the file reaches that age, it will automatically
	 * be deleted by a cron job.
	 *
	 * @since 4.9.6
	 *
	 * @param int $expiration The expiration age of the export, in seconds.
	 */
	$expiration = apply_filters( 'wp_privacy_export_expiration', 3 * DAY_IN_SECONDS );

	foreach ( (array) $export_files as $export_file ) {
		$file_age_in_seconds = time() - filemtime( $export_file );

		if ( $expiration < $file_age_in_seconds ) {
			unlink( $export_file );
		}
	}
}

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