AlmanacKeys.php
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	<?php

	final class AlmanacKeys extends Phobject {

	public static function getKeyPath($key_name) {
	$root = dirname(phutil_get_library_root('phabricator'));
	$keys = $root.'/conf/keys/';

	return $keys.ltrim($key_name, '/');
	}

	public static function getDeviceID() {
	$device_id_path = self::getKeyPath('device.id');

	if (Filesystem::pathExists($device_id_path)) {
	return trim(Filesystem::readFile($device_id_path));
	}

	return null;
	}

	public static function getLiveDevice() {
	$device_id = self::getDeviceID();
	if (!$device_id) {
	return null;
	}

	$cache = PhabricatorCaches::getRequestCache();
	$cache_key = 'almanac.device.self';

	$device = $cache->getKey($cache_key);
	if (!$device) {
	$viewer = PhabricatorUser::getOmnipotentUser();
	$device = id(new AlmanacDeviceQuery())
	->setViewer($viewer)
	->withNames(array($device_id))
	->executeOne();
	if (!$device) {
	throw new Exception(
	pht(
	'This host has device ID "%s", but there is no corresponding '.
	'device record in Almanac.',
	$device_id));
	}
	$cache->setKey($cache_key, $device);
	}

	return $device;
	}

	}