PHPで作るAmazon商品検索スクリプト(結果がJSON)

こんばんは、私です。
今日は簡単にソースを公開します。
どんなのかと言うと、AWSECommerceServiceのItemLookupを内包してJSONで結果を返すって物です。
先日、2016年8月29日「AWSECommerceServiceを使う方法」にてAWSECommerceServiceの使い方ってのを解説した。
今回はそれの実装である。

リクエストとしてISBN(バーコード)を指定してやれば、JSON形式のItem情報が出てきまっす。

<?php
	header("Cache-Control: no-cache, must-revalidate");
	header("Content-type: text/html; charset=utf-8");

	$ISBN     = $_GET["isbn"];

	require_once("./Book.php");
	require_once("./Author.php");

	$request = createURL($ISBN);

	$response   = file_get_contents($request);
	$parsed_xml = simplexml_load_string($response);

	// Get AWS 判定
	if( $parsed_xml->Items->Request->IsValid != 'True' ) return -1;

	$Item       = $parsed_xml->Items->Item;
	$Attributes = $Item->ItemAttributes;

	$book = new Book();
	$book->isbn = (string)$Attributes->ISBN;
	$book->asin = (string)$Item->ASIN;
	$book->ean = (string)$Attributes->EAN;;
	$book->title = (string)$Attributes->Title;
	$book->image_url = (string)$Item->MediumImage->URL;
	$book->pubdate = (string)$Attributes->PublicationDate;
	$book->price = (string)$Attributes->ListPrice->Amount;
	$book->pages = (string)$Attributes->NumberOfPages;
	$book->publisher = (string)$Attributes->Publisher;
	$book->binding = (string)$Attributes->Binding;
	$book->currency_cd = (string)$Attributes->ListPrice->CurrencyCode;

	$author_name = array();
	foreach( $Attributes->Author as $author_name ) {
		array_push($author_name, $author_name);
	}
	foreach( $Attributes->Creator as $creator ) {
		array_push($author_name, $creator);
	}

	$author_array = array();
	for ( $i=0; $i<sizeof($author_name); $i++ ) {
		$author = new Author();
		$author->author = (string)($author_name[$i]);
		$author->role = (string)($author_name[$i]['Role']);
		$author_array[] = $author;
	}

	$book->authors = $author_array;

	if ( !$book->isbn ) {
		echo " No book found for ISBN =" . $ISBN . " in Amazon DB <br></br>";
		$book = NULL;
		$author_array=NULL;
		return;
	}

	echo json_encode($book,JSON_UNESCAPED_UNICODE);
	$book = NULL;
	$author_array=NULL;

	?>

リクエストを出して入れ物に入れているだけのシンプル構造です。
	<?php 
	function createURL($isbn){
		$config = parse_ini_file("awsaccount.ini",true);

		// Amazon Sample
		// http://webservices.amazon.co.jp/scratchpad/index.html

		// Your AWS Access Key ID, as taken from the AWS Your Account page
		$aws_access_key_id = $config['amazon']['AccessKeyId'];
		// Your AWS Secret Key corresponding to the above ID, as taken from the AWS Your Account page
		$aws_secret_key = $config['amazon']['SecretKey'];

		$associate_tag = $config['amazon']['AssociateTag'];

		// The region you are interested in
		$endpoint = "webservices.amazon.co.jp";

		$uri = "/onca/xml";

		$params = array(
			"Service" => "AWSECommerceService",
			"Operation" => "ItemLookup",
			"AWSAccessKeyId" => $aws_access_key_id ,
			"AssociateTag" => $associate_tag ,
			"ResponseGroup" => "Large",
			"ItemId" => $isbn ,
			"SearchIndex" => "Books",
			"IdType" => "ISBN"
		);

		// Set current timestamp if not set
		if (!isset($params["Timestamp"])) {
			$params["Timestamp"] = gmdate('Y-m-d\TH:i:s\Z');
		}

		// Sort the parameters by key
		ksort($params);

		$pairs = array();

		foreach ($params as $key => $value) {
			array_push($pairs, rawurlencode($key)."=".rawurlencode($value));
		}

		// Generate the canonical query
		$canonical_query_string = join("&", $pairs);

		// Generate the string to be signed
		$string_to_sign = "GET\n".$endpoint."\n".$uri."\n".$canonical_query_string;

		// Generate the signature required by the Product Advertising API
		$signature = base64_encode(hash_hmac("sha256", $string_to_sign, $aws_secret_key, true));

		// Generate the signed URL
		$request_url = 'http://'.$endpoint.$uri.'?'.$canonical_query_string.'&Signature='.rawurlencode($signature);

		return $request_url;
	}
?>

function createURLは先日のBlogの最後に書いている

amazon scratchpad

にサンプルが表示されますがそれを関数にしています。

アクセス情報をawsaccount.iniファイルにはき出させてます。
awsaccount.ini
[amazon]
	AccessKeyId = accessS
	AssociateTag = mmppwataru01-22
	SecretKey = hogehoge


Book.php
<?php
class Book {
        public $isbn         = "";
        public $asin         = "";
        public $ean          = "";
        public $title        = "";
        public $image_url    = "";
        public $pubdate      = "";
        public $price        = "";
        public $page         = "";
        public $publisher    = "";
        public $binding      = "";
        public $currency_cd  = "";

        public $authors = array();
}
?>

Author.php
<?php
Class author {
        public $author = "";
        public $role   = "";
        public function setAuthor($author) {
            $this->author = $author;
        }
        public function getRole() {
           return $this->role;
        }
        public function setRole($role) {
           $this->role = $role;
        }
}
?>

難しそうですがシンプルですわん

JSONなのでAJAXで通信させれば便利になりました。
これで世界が加速した。