testing

PhabricatorCustomHeaderConfigType.php
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			<?php

			final class PhabricatorCustomHeaderConfigType
			extends PhabricatorConfigOptionType {

			public function validateOption(PhabricatorConfigOption $option, $value) {
			if (phid_get_type($value) != PhabricatorFileFilePHIDType::TYPECONST) {
			throw new Exception(
			pht(
			'%s is not a valid file PHID.',
			$value));
			}

			$file = id(new PhabricatorFileQuery())
			->setViewer(PhabricatorUser::getOmnipotentUser())
			->withPHIDs(array($value))
			->executeOne();
			if (!$file) {
			throw new Exception(
			pht(
			'%s is not a valid file PHID.',
			$value));
			}

			$most_open_policy = PhabricatorPolicies::getMostOpenPolicy();
			if ($file->getViewPolicy() != $most_open_policy) {
			throw new Exception(
			pht(
			'Specified file %s has policy "%s" but should have policy "%s".',
			$value,
			$file->getViewPolicy(),
			$most_open_policy));
			}

			if (!$file->isViewableImage()) {
			throw new Exception(
			pht(
			'Specified file %s is not a viewable image.',
			$value));
			}
			}

			public static function getExampleConfig() {
			$config = 'PHID-FILE-abcd1234abcd1234abcd';
			return $config;
			}

			}