Add simple Github client for downloading release assets

[MAILPOET-3471]

tasks/GithubClient.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace MailPoetTasks;
+
+use GuzzleHttp\Client;
+
+class GithubClient {
+  /** @var Client */
+  private $httpClient;
+
+  private const API_BASE_URI = 'https://api.github.com/repos';
+
+  public function __construct($username, $token, $repo) {
+    $this->httpClient = new Client([
+      'auth' => [$username, $token],
+      'headers' => [
+        'Accept' => 'application/vnd.github.v3+json',
+      ],
+      'base_uri' => self::API_BASE_URI . "/$repo/",
+    ]);
+  }
+
+  public function downloadReleaseZip($zip, $downloadDir, $tag = null) {
+    $release = $this->getRelease($tag);
+    if (!$release) {
+      throw new \Exception("Release $tag not found");
+    }
+    $assetDownloadUrl = null;
+    foreach ($release['assets'] as $asset) {
+      if ($asset['name'] === $zip) {
+        $assetDownloadUrl = $asset['url'];
+      }
+    }
+    if (!$assetDownloadUrl) {
+      throw new \Exception("Release zip for $tag not found");
+    }
+    $this->httpClient->get($assetDownloadUrl, ['sink' => $downloadDir . $zip, 'headers' => ['Accept' => 'application/octet-stream']]);
+  }
+
+  private function getRelease($tag = null) {
+    $path = 'releases/' . ($tag ? "tags/$tag" : 'latest');
+    $response = $this->httpClient->get($path);
+    return json_decode($response->getBody()->getContents(), true);
+  }
+}