Tidy up integrations, use contracts

app/Integrations/Core/Feed.php

@@ -0,0 +1,89 @@
+<?php
+
+/*
+ * This file is part of Cachet.
+ *
+ * (c) Alt Three Services Limited
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace CachetHQ\Cachet\Integrations\Core;
+
+use CachetHQ\Cachet\Integrations\Contracts\Feed as FeedContract;
+use Exception;
+use GuzzleHttp\Client;
+use Illuminate\Contracts\Cache\Repository;
+
+/**
+ * This is the feed class.
+ *
+ * @author James Brooks <james@alt-three.com>
+ */
+class Feed implements FeedContract
+{
+    /**
+     * The default url.
+     *
+     * @var string
+     */
+    const URL = 'https://blog.alt-three.com/tag/cachet/rss';
+
+    /**
+     * The failed status indicator.
+     *
+     * @var int
+     */
+    const FAILED = 1;
+
+    /**
+     * The cache repository instance.
+     *
+     * @var \Illuminate\Contracts\Cache\Repository
+     */
+    protected $cache;
+
+    /**
+     * The url to use.
+     *
+     * @var string|null
+     */
+    protected $url;
+
+    /**
+     * Creates a new feed instance.
+     *
+     * @param \Illuminate\Contracts\Cache\Repository $cache
+     * @param string|null                            $url
+     *
+     * @return void
+     */
+    public function __construct(Repository $cache, $url = null)
+    {
+        $this->cache = $cache;
+        $this->url = $url ?: static::URL;
+    }
+
+    /**
+     * Returns the latest entries.
+     *
+     * @return array|null
+     */
+    public function latest()
+    {
+        $result = $this->cache->remember('feeds', 720, function () {
+            try {
+                $xml = simplexml_load_string((new Client())->get($this->url, [
+                    'headers' => ['Accept' => 'application/rss+xml', 'User-Agent' => defined('CACHET_VERSION') ? 'cachet/'.constant('CACHET_VERSION') : 'cachet'],
+                ])->getBody()->getContents(), null, LIBXML_NOCDATA);
+
+                return json_decode(json_encode($xml));
+            } catch (Exception $e) {
+                return self::FAILED;
+            }
+        });
+
+        return $result === self::FAILED ? null : $result;
+    }
+}