Chris@13: <?php
Chris@13: 
Chris@13: /*
Chris@13:  * This file is part of Psy Shell.
Chris@13:  *
Chris@13:  * (c) 2012-2018 Justin Hileman
Chris@13:  *
Chris@13:  * For the full copyright and license information, please view the LICENSE
Chris@13:  * file that was distributed with this source code.
Chris@13:  */
Chris@13: 
Chris@13: namespace Psy\VersionUpdater;
Chris@13: 
Chris@13: use Psy\Shell;
Chris@13: 
Chris@13: class GitHubChecker implements Checker
Chris@13: {
Chris@13:     const URL = 'https://api.github.com/repos/bobthecow/psysh/releases/latest';
Chris@13: 
Chris@13:     private $latest;
Chris@13: 
Chris@13:     /**
Chris@13:      * @return bool
Chris@13:      */
Chris@13:     public function isLatest()
Chris@13:     {
Chris@17:         return \version_compare(Shell::VERSION, $this->getLatest(), '>=');
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * @return string
Chris@13:      */
Chris@13:     public function getLatest()
Chris@13:     {
Chris@13:         if (!isset($this->latest)) {
Chris@13:             $this->setLatest($this->getVersionFromTag());
Chris@13:         }
Chris@13: 
Chris@13:         return $this->latest;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * @param string $version
Chris@13:      */
Chris@13:     public function setLatest($version)
Chris@13:     {
Chris@13:         $this->latest = $version;
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * @return string|null
Chris@13:      */
Chris@13:     private function getVersionFromTag()
Chris@13:     {
Chris@13:         $contents = $this->fetchLatestRelease();
Chris@13:         if (!$contents || !isset($contents->tag_name)) {
Chris@13:             throw new \InvalidArgumentException('Unable to check for updates');
Chris@13:         }
Chris@13:         $this->setLatest($contents->tag_name);
Chris@13: 
Chris@13:         return $this->getLatest();
Chris@13:     }
Chris@13: 
Chris@13:     /**
Chris@13:      * Set to public to make testing easier.
Chris@13:      *
Chris@13:      * @return mixed
Chris@13:      */
Chris@13:     public function fetchLatestRelease()
Chris@13:     {
Chris@17:         $context = \stream_context_create([
Chris@13:             'http' => [
Chris@13:                 'user_agent' => 'PsySH/' . Shell::VERSION,
Chris@13:                 'timeout'    => 3,
Chris@13:             ],
Chris@13:         ]);
Chris@13: 
Chris@17:         \set_error_handler(function () {
Chris@13:             // Just ignore all errors with this. The checker will throw an exception
Chris@13:             // if it doesn't work :)
Chris@13:         });
Chris@13: 
Chris@17:         $result = @\file_get_contents(self::URL, false, $context);
Chris@13: 
Chris@17:         \restore_error_handler();
Chris@13: 
Chris@17:         return \json_decode($result);
Chris@13:     }
Chris@13: }