Cleanup the segment repositories

This code should now work on guzzle 4, guzzle 5 and guzzle 6.

app/Segment/CacheRepository.php

@@ -19,14 +19,18 @@ use Illuminate\Database\QueryException;
 class CacheRepository implements RepositoryInterface
 {
     /**
+     * The underlying segment repository instance.
+     *
      * @var \CachetHQ\Cachet\Segment\RepositoryInterface
      */
     protected $repository;
 
     /**
-     * Instantiates a new instance of the Cache Repository.
+     * Create a new segment cache repository instance.
      *
      * @param \CachetHQ\Cachet\Segment\RepositoryInterface $repository
+     *
+     * @return void
      */
     public function __construct(RepositoryInterface $repository)
     {
@@ -34,14 +38,12 @@ class CacheRepository implements RepositoryInterface
     }
 
     /**
-     * Determines whether to use the segment_write_key setting or to fetch a new.
+     * Returns the segment write key.
      *
      * @return string
      */
     public function fetch()
     {
-        $writeKey = null;
-
         // We might not be setup yet.
         try {
             // Firstly, does the setting exist?

app/Segment/HttpRepository.php

@@ -16,20 +16,24 @@ use GuzzleHttp\ClientInterface;
 class HttpRepository implements RepositoryInterface
 {
     /**
-     * @var \Guzzle\GuzzleClient
+     * The guzzle client instance.
+     *
+     * @var \GuzzleHttp\ClientInterface
      */
     protected $client;
 
     /**
+     * The url to use.
+     *
      * @var string
      */
     protected $url;
 
     /**
-     * Instantiates a new instance of the SegmentApi class.
+     * Create a new segment http repository instance.
      *
-     * @param \Guzzle\GuzzleClient $client
-     * @param string               $url
+     * @param \GuzzleHttp\ClientInterface $client
+     * @param string                      $url
      */
     public function __construct(ClientInterface $client, $url)
     {
@@ -38,12 +42,16 @@ class HttpRepository implements RepositoryInterface
     }
 
     /**
-     * Fetches the segment_write_key from the given url.
+     * Returns the segment write key.
      *
      * @return string
      */
     public function fetch()
     {
-        return $this->client->get($this->url)->json()['segment_write_key'];
+        $response = $this->client->get($this->url);
+
+        $body = json_decode($response->getBody());
+
+        return $body['segment_write_key'];
     }
 }

app/Segment/RepositoryInterface.php

@@ -14,7 +14,7 @@ namespace CachetHQ\Cachet\Segment;
 interface RepositoryInterface
 {
     /**
-     * Returns the segment_write_key.
+     * Returns the segment write key.
      *
      * @return string
      */