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<?php |
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namespace AntoineAugusti\Books; |
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use DateTime; |
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use GuzzleHttp\ClientInterface; |
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use InvalidArgumentException; |
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class Fetcher |
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{ |
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/** |
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* @var ClientInterface |
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*/ |
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private $client; |
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/** |
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* @param ClientInterface $client |
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*/ |
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public function __construct(ClientInterface $client) |
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{ |
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$this->client = $client; |
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} |
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/** |
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* Retrieve information about a book given its ISBN. |
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* |
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* @param string $isbn |
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* |
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* @throws InvalidArgumentException When the ISBN has not the expected format |
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* @throws InvalidResponseException When the client got an unexpected response |
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* |
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* @return Book |
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*/ |
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public function forISBN($isbn) |
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{ |
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if (!$this->isValidISBN($isbn)) { |
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throw new InvalidArgumentException('ISBN is not valid. Got: '.$isbn); |
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} |
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// Example: https://www.googleapis.com/books/v1/volumes?q=isbn:9780142181119 |
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$response = $this->client->request('GET', 'volumes', [ |
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'query' => ['q' => 'isbn:'.$isbn], |
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'http_errors' => false, |
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]); |
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$status = $response->getStatusCode(); |
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if ($status != 200) { |
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throw new InvalidResponseException('Invalid response. Status: '.$status.'. Body: '.$response->getBody()); |
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} |
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$res = json_decode($response->getBody(), true); |
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$totalItems = intval($res['totalItems']); |
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if ($totalItems != 1) { |
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throw new InvalidResponseException('Did not get 1 result. Got: '.$totalItems); |
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} |
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return $this->extractBook($res); |
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} |
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private function extractBook($res) |
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{ |
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$item = $res['items'][0]; |
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$publishedDate = null; |
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if (array_key_exists('publishedDate', $item['volumeInfo'])) { |
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$publishedDate = DateTime::createFromFormat('Y-m-d', $item['volumeInfo']['publishedDate'])->setTime(0, 0); |
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} |
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return new Book($item['volumeInfo']['title'], |
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$this->getOrDefault($item['volumeInfo'], 'subtitle', null), |
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$this->getOrDefault($item['volumeInfo'], 'authors', null), |
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$this->getOrDefault($item['volumeInfo'], 'printType', null), |
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intval($this->getOrDefault($item['volumeInfo'], 'pageCount', null)), |
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$this->getOrDefault($item['volumeInfo'], 'publisher', null), |
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$publishedDate, |
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$this->getOrDefault($item['volumeInfo'], 'averageRating', null), |
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$item['volumeInfo']['imageLinks']['thumbnail'], |
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$this->getOrDefault($item['volumeInfo'], 'language', null), |
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$this->getOrDefault($item['volumeInfo'], 'categories', [])); |
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} |
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private function getOrDefault($array, $key, $default) |
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{ |
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if (array_key_exists($key, $array)) { |
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return $array[$key]; |
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} |
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return $default; |
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} |
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/** |
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* Check if a given ISBN is valid. |
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* |
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* @param string $isbn |
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* |
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* @return bool |
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*/ |
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private function isValidISBN($isbn) |
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{ |
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return preg_match('/[0-9]{10,13}/', $isbn); |
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} |
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} |
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AntoineAugusti /
google-books
