Anonymous Segment.com tracking. Closes #91.

src/Segment/CacheRepository.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace CachetHQ\Cachet\Segment;
+
+use CachetHQ\Cachet\Facades\Setting;
+use CachetHQ\Cachet\Models\Setting as SettingModel;
+use Carbon\Carbon;
+
+class CacheRepository implements RepositoryInterface
+{
+    /**
+     * @var \CachetHQ\Cachet\Segment\HttpRepository
+     */
+    protected $repository;
+
+    /**
+     * Instantiates a new instance of the Cache Repository.
+     *
+     * @param \CachetHQ\Cachet\Segment\HttpRepository $repository
+     */
+    public function __construct(RepositoryInterface $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Determines whether to use the segment_write_key setting or to fetch a new.
+     *
+     * @return string
+     */
+    public function fetch()
+    {
+        // Firstly, does the setting exist?
+        if (false === ($writeKey = Setting::get('segment_write_key'))) {
+            // No, let's go fetch it.
+            $writeKey = $this->repository->fetch();
+            Setting::set('segment_write_key', $writeKey);
+        } else {
+            // It does, but how old is it?
+            $setting = SettingModel::where('name', 'segment_write_key')->first();
+
+            // It's older than an hour, let's refresh
+            if ($setting->updated_at->lt(Carbon::now()->subHour())) {
+                $writeKey = $this->repository->fetch();
+
+                // Update the setting. This is done manual to make sure updated_at is overwritten.
+                $setting->value = $writeKey;
+                $setting->updated_at = Carbon::now();
+                $setting->save();
+            }
+        }
+
+        return $writeKey;
+    }
+}