#60: Added a basic about page with a link to Github's API to fetch the latest release

2017-10-01 16:48:50 +01:00
parent 89544437cd
commit dcfcbca530
14 changed files with 365 additions and 3 deletions
@@ -0,0 +1,100 @@
+<?php
+
+namespace App\Services;
+
+class GithubService
+{
+    private $cacheFile = null;
+    private $config = [];
+
+    public function __construct()
+    {
+        $this->config = config('services.github');
+        $this->cacheFile = storage_path('app/github_cache.txt');
+    }
+
+    public function checkForLatestRelease()
+    {
+        $releaseInfo = [];
+        $etag = '';
+
+        if ($this->doesCacheExist())
+        {
+            // Get the etag from the cache
+            $cacheData = $this->getCacheData();
+            $etag = $cacheData->latest_release->etag;
+            $releaseInfo = $cacheData->latest_release->release_info;
+        }
+
+        // Lookup and store the version information
+        $statusCode = -1;
+        $result = $this->getLatestReleaseFromGithub($etag, $statusCode);
+
+        if ($statusCode == 200)
+        {
+            // Store the etag (in HTTP headers) for future reference
+            $matches = [];
+            $etag = '';
+            if (preg_match('/^etag: "(.+)"/mi', $result[0], $matches))
+            {
+                $etag = $matches[1];
+            }
+
+            $releaseInfo = json_decode($result[1]);
+        }
+
+        if (!empty($etag))
+        {
+            $this->setCacheData([
+                'latest_release' => [
+                    'etag' => $etag,
+                    'release_info' => $releaseInfo
+                ]
+            ]);
+        }
+
+        return $releaseInfo;
+    }
+
+    private function doesCacheExist()
+    {
+        return file_exists($this->cacheFile);
+    }
+
+    private function getCacheData()
+    {
+        return json_decode(file_get_contents($this->cacheFile));
+    }
+
+    private function getLatestReleaseFromGithub($etag = '', &$statusCode)
+    {
+        $httpHeaders = [
+            sprintf('User-Agent: pandy06269/blue-twilight (v%s)', config('app.version'))
+        ];
+
+        if (!empty($etag))
+        {
+            $httpHeaders[] = sprintf('If-None-Match: "%s"', $etag);
+        }
+
+        $ch = curl_init($this->config['latest_release_url']);
+        curl_setopt($ch, CURLOPT_HTTPHEADER, $httpHeaders);
+        curl_setopt($ch, CURLOPT_HEADER, true);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        $result = curl_exec($ch);
+
+        if ($result === false)
+        {
+            throw new \Exception(sprintf('Error from Github: %s', curl_error($ch)));
+        }
+
+        $statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+
+        return explode("\r\n\r\n", $result, 2);
+    }
+
+    private function setCacheData(array $data)
+    {
+        file_put_contents($this->cacheFile, json_encode($data));
+    }
+}