Add attachments, more pages

app/Services/BookInformation/CachedService.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Services\BookInformation;
+
+use Cache;
+
+class CachedService implements BookLookupService {
+    private $service;
+
+    public function __construct($service) {
+        $this->service = $service;
+    }
+
+    public function lookup($isbn) {
+        return Cache::remember('isbn_' . $isbn, 86400, function() use ($isbn) {
+            return $this->service->lookup($isbn);
+        });
+    }
+}

app/Services/BookInformation/GoogleBooks.php

@@ -22,9 +22,10 @@ class GoogleBooks implements BookLookupService {
          */
         $volume = Arr::first($results->getItems())->getVolumeInfo();
 
-        return [
+        return (object) [
             'title' => $volume->getTitle(),
-            'authors' => $volume->getAuthors()
+            'authors' => $volume->getAuthors(),
+            'images' => $volume->getImageLinks(),
         ];
     }
 }