first commit

app/Services/BookInformation/BookLookupService.php

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+<?php
+
+namespace App\Services\BookInformation;
+
+interface BookLookupService {
+    public function lookup($isbn);
+}

app/Services/BookInformation/GoogleBooks.php

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+<?php
+
+namespace App\Services\BookInformation;
+
+use Google_Client;
+use Google_Service_Books;
+
+class GoogleBooks implements BookLookupService {
+
+    public function lookup($isbn) {
+        $client = new Google_Client();
+        $client->setApplicationName("BookInventory");
+        $client->setDeveloperKey(env('GOOGLE_BOOKS_KEY'));
+
+        $service = new Google_Service_Books($client);
+
+        $results = $service->volumes->listVolumes('isbn:' . $isbn);
+
+        /**
+         * @var \Google_Service_Books_Volume
+         */
+        $volume = array_first($results->getItems())->getVolumeInfo();
+
+        return [
+            'title' => $volume->getTitle(),
+            'authors' => $volume->getAuthors()
+        ];
+    }
+}

app/Services/BookInformation/LookupException.php

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+<?php
+
+namespace App\Services\BookInformation;
+
+use Exception;
+
+class LookupException extends Exception {
+
+}