first commit

app/Http/Controllers/LookupController.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Cache;
+use App\Services\BookInformation\GoogleBooks;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+class LookupController {
+    public function lookup($isbn) {
+        if (!preg_match('/^(\d+)$/', $isbn)) {
+            throw new HttpException(400);
+        }
+
+        return Cache::remember('isbn_' . $isbn, 1440, function() use ($isbn) {
+            $google_books = new GoogleBooks();
+
+            return $google_books->lookup($isbn);
+        });
+    }
+}