100 lines
2.5 KiB
PHP
100 lines
2.5 KiB
PHP
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<?php
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namespace App\Services;
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class GithubService
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{
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private $cacheFile = null;
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private $config = [];
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public function __construct()
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{
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$this->config = config('services.github');
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$this->cacheFile = storage_path('app/github_cache.txt');
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}
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public function checkForLatestRelease()
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{
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$releaseInfo = [];
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$etag = '';
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if ($this->doesCacheExist())
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{
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// Get the etag from the cache
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$cacheData = $this->getCacheData();
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$etag = $cacheData->latest_release->etag;
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$releaseInfo = $cacheData->latest_release->release_info;
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}
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// Lookup and store the version information
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$statusCode = -1;
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$result = $this->getLatestReleaseFromGithub($etag, $statusCode);
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if ($statusCode == 200)
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{
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// Store the etag (in HTTP headers) for future reference
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$matches = [];
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$etag = '';
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if (preg_match('/^etag: "(.+)"/mi', $result[0], $matches))
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{
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$etag = $matches[1];
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}
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$releaseInfo = json_decode($result[1]);
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}
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if (!empty($etag))
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{
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$this->setCacheData([
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'latest_release' => [
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'etag' => $etag,
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'release_info' => $releaseInfo
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]
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]);
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}
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return $releaseInfo;
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}
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private function doesCacheExist()
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{
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return file_exists($this->cacheFile);
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}
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private function getCacheData()
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{
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return json_decode(file_get_contents($this->cacheFile));
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}
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private function getLatestReleaseFromGithub($etag = '', &$statusCode)
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{
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$httpHeaders = [
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sprintf('User-Agent: pandy06269/blue-twilight (v%s)', config('app.version'))
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];
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if (!empty($etag))
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{
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$httpHeaders[] = sprintf('If-None-Match: "%s"', $etag);
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}
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$ch = curl_init($this->config['latest_release_url']);
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curl_setopt($ch, CURLOPT_HTTPHEADER, $httpHeaders);
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curl_setopt($ch, CURLOPT_HEADER, true);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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$result = curl_exec($ch);
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if ($result === false)
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{
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throw new \Exception(sprintf('Error from Github: %s', curl_error($ch)));
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}
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$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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return explode("\r\n\r\n", $result, 2);
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}
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private function setCacheData(array $data)
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{
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file_put_contents($this->cacheFile, json_encode($data));
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}
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}
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