blog/content/post/2009/05/28/2009-05-28-00001162.md

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---
title: AmazonのWebサービスを使ってみる
author: kazu634
date: 2009-05-28
wordtwit_post_info:
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categories:
- Perl
---
<div class="section">
<p>
はてなで日記を書いて本の紹介をするときは、本の裏をめくってisbn13をasinに変換している。でも、この方法だと雑誌の場合うまくいかない。雑誌はasinでBから始まっている。普通のisbn13をasin(=isbn10)に変換するアルゴリズムでは変換できないからだ。
</p>
<p>
ある日、ふとAmazonでisbn13(=実はバーコードの数字と同じ)を入力すると、検索できることが判明。前に試したときはできなかったような気がするのだけれど。。。でも、isbn13を入力すれば、Amazonで管理しているID(=asin)が判明することがわかった。
</p>
<p>
というわけで、PerlでAmazonのWebサービスを使ってみようと決意したのであった。
</p>
<h4>
Perlのコード
</h4>
<p>
Perlの偉い人が「<a href="http://blog.livedoor.jp/dankogai/archives/51211577.html" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://blog.livedoor.jp/dankogai/archives/51211577.html', '404 Blog Not Found:perl &#8211; URI::Amazon::APA released!');" target="_blank">404 Blog Not Found:perl &#8211; URI::Amazon::APA released!</a>」というのを公開しているので、それを活用する。とりあえずサンプルをそのままコピペしてみた。
</p>
<pre class="syntax-highlight">
<span class="synComment"># === Libraries ===</span>
<span class="synStatement">use strict</span>;
<span class="synStatement">use warnings</span>;
<span class="synStatement">use </span>LWP::UserAgent;
<span class="synStatement">use </span>URI::Amazon::APA;
<span class="synStatement">use </span>XML::Simple;
<span class="synStatement">use </span>YAML::Syck;
<span class="synComment"># === Main part ===</span>
<span class="synStatement">my</span> <span class="synIdentifier">$u</span> = URI::Amazon::APA-&#62;<span class="synStatement">new</span>(<span class="synConstant">'http://ecs.amazonaws.jp/onca/xml'</span>);
<span class="synIdentifier">$u</span>-&#62;query_form(
<span class="synConstant">Service </span>=&#62; <span class="synConstant">'AWSECommerceService'</span>,
<span class="synConstant">Operation </span>=&#62; <span class="synConstant">'ItemLookup'</span>,
<span class="synConstant">ItemId </span>=&#62; <span class="synStatement">shift</span> || <span class="synConstant">'9784798118925'</span>,
<span class="synConstant">IdType </span>=&#62; <span class="synConstant">'EAN'</span>,
<span class="synConstant">SearchIndex </span>=&#62; <span class="synConstant">'Books'</span>,
);
<span class="synIdentifier">$u</span>-&#62;sign(
<span class="synConstant">key </span>=&#62; <span class="synConstant">'キー'</span>,
<span class="synConstant">secret </span>=&#62; <span class="synConstant">'秘密鍵'</span>
);
<span class="synStatement">my</span> <span class="synIdentifier">$ua</span> = LWP::UserAgent-&#62;<span class="synStatement">new</span>;
<span class="synStatement">my</span> <span class="synIdentifier">$r</span> = <span class="synIdentifier">$ua</span>-&#62;get(<span class="synIdentifier">$u</span>);
<span class="synStatement">print</span> <span class="synIdentifier">$r</span>-&#62;status_line, <span class="synConstant">&#34;</span><span class="synSpecial">\n</span><span class="synConstant">&#34;</span>, YAML::Syck::Dump( XMLin( <span class="synIdentifier">$r</span>-&#62;content ) );
</pre>
<p>
注意すべきは、
</p>
<ul>
<li>
IdTypeはEANを指定するデフォルトだとasinで検索してしまうため。今回はバーコードの数字で検索できるように指定してあげる
</li>
<li>
SearchIndexはBooks今回は本なので
</li>
</ul>
<p>
という点です。
</p>
<h4>
実行結果
</h4>
<p>
実行してみます:
</p>
<pre class="syntax-highlight">
~<span class="synStatement">/</span><span class="synConstant">bin on simoom634 </span><span class="synSpecial">[503]</span><span class="synConstant"> </span><span class="synIdentifier">$: </span><span class="synConstant">perl </span><span class="synSpecial">.</span><span class="synStatement">/</span>access_amazon.pl
<span class="synConstant">200</span> OK
---
Items:
Item:
ASIN: <span class="synConstant">4798118923</span>
DetailPageURL: http://www.amazon.co.jp/More-Joel-Software-Spolsky/dp/<span class="synConstant">4798118923</span>%3FSubscriptionId%3DAKIAI54BKVADN7EPRVZA%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3D4798118923
ItemAttributes:
Author: Joel Spolsky
Creator:
Role: 翻訳
content: 青木 靖
Manufacturer: 翔泳社
ProductGroup: Book
Title: More Joel on Software
ItemLinks:
ItemLink:
-
Description: Add To Wishlist
-
Description: Tell A Friend
-
Description: All Customer Reviews
-
Description: All Offers
Request:
IsValid: <span class="synConstant">'True'</span>
ItemLookupRequest:
Condition: New
DeliveryMethod: Ship
IdType: EAN
ItemId: <span class="synConstant">9784798118925</span>
MerchantId: Amazon
OfferPage: <span class="synConstant">1</span>
ResponseGroup: Small
ReviewPage: <span class="synConstant">1</span>
ReviewSort: -SubmissionDate
SearchIndex: Books
VariationPage: All
OperationRequest:
Arguments:
Argument:
-
Name: Operation
Value: ItemLookup
-
Name: Service
Value: AWSECommerceService
-
Name: Version
Value: <span class="synConstant">2009-01-01</span>
-
Name: SearchIndex
Value: Books
-
Name: Signature
Value: gwfPyW7fYVfp/lFxseRThAn8uSCKV4+SRj5CAAJeBws=
-
Name: ItemId
Value: <span class="synConstant">9784798118925</span>
-
Name: IdType
Value: EAN
-
Name: AWSAccessKeyId
Value: AKIAI54BKVADN7EPRVZA
-
Name: Timestamp
Value: <span class="synConstant">2009-05</span>-28T14:<span class="synConstant">46</span>:19Z
HTTPHeaders:
Header:
Name: UserAgent
Value: libwww-perl/<span class="synConstant">5.826</span>
RequestId: 73da30ef-a5eb-4f67-bb5e-50b699de5177
RequestProcessingTime: <span class="synConstant">0.0748140000000000</span>
xmlns: http://webservices.amazon.co<span class="synStatement">m/</span><span class="synConstant">AWSECommerceService</span><span class="synStatement">/</span><span class="synConstant">2008-10-06</span>
</pre>
</div>