Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of Psy Shell.
Chris@0:  *
Chris@0:  * (c) 2012-2018 Justin Hileman
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Psy\VersionUpdater;
Chris@0: 
Chris@0: use Psy\Shell;
Chris@0: 
Chris@0: class GitHubChecker implements Checker
Chris@0: {
Chris@0:     const URL = 'https://api.github.com/repos/bobthecow/psysh/releases/latest';
Chris@0: 
Chris@0:     private $latest;
Chris@0: 
Chris@0:     /**
Chris@0:      * @return bool
Chris@0:      */
Chris@0:     public function isLatest()
Chris@0:     {
Chris@0:         return version_compare(Shell::VERSION, $this->getLatest(), '>=');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return string
Chris@0:      */
Chris@0:     public function getLatest()
Chris@0:     {
Chris@0:         if (!isset($this->latest)) {
Chris@0:             $this->setLatest($this->getVersionFromTag());
Chris@0:         }
Chris@0: 
Chris@0:         return $this->latest;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @param string $version
Chris@0:      */
Chris@0:     public function setLatest($version)
Chris@0:     {
Chris@0:         $this->latest = $version;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return string|null
Chris@0:      */
Chris@0:     private function getVersionFromTag()
Chris@0:     {
Chris@0:         $contents = $this->fetchLatestRelease();
Chris@0:         if (!$contents || !isset($contents->tag_name)) {
Chris@0:             throw new \InvalidArgumentException('Unable to check for updates');
Chris@0:         }
Chris@0:         $this->setLatest($contents->tag_name);
Chris@0: 
Chris@0:         return $this->getLatest();
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Set to public to make testing easier.
Chris@0:      *
Chris@0:      * @return mixed
Chris@0:      */
Chris@0:     public function fetchLatestRelease()
Chris@0:     {
Chris@0:         $context = stream_context_create([
Chris@0:             'http' => [
Chris@0:                 'user_agent' => 'PsySH/' . Shell::VERSION,
Chris@0:                 'timeout'    => 3,
Chris@0:             ],
Chris@0:         ]);
Chris@0: 
Chris@0:         set_error_handler(function () {
Chris@0:             // Just ignore all errors with this. The checker will throw an exception
Chris@0:             // if it doesn't work :)
Chris@0:         });
Chris@0: 
Chris@0:         $result = @file_get_contents(self::URL, false, $context);
Chris@0: 
Chris@0:         restore_error_handler();
Chris@0: 
Chris@0:         return json_decode($result);
Chris@0:     }
Chris@0: }