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Amazon product advertising APIを使ってWordpressのサイドバーにリンクを表示するためのサンプルコード。
<?php
function create_url($params,$aws_secret_key) {
// The region you are interested in
$endpoint = "webservices.amazon.co.jp";
$uri = "/onca/xml";
// Set current timestamp if not set
if (!isset($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($signature);
// echo "Signed URL: \"".$request_url."\"";
return $request_url;
}
function parse_response($response,$http_response_header,$i) {
$rcode = 0;
foreach($http_response_header as $k=>$v) {
if (preg_match("#HTTP/[0-9\.]+\s+([0-9]+)#",$v,$out)) {
$rcode = intval($out[1]);
}
}
if ($rcode >= 300) {
return "";
}
$parsed_xml = null;
if (isset($response)) {
$parsed_xml = simplexml_load_string($response);
}
$content = "";
$items = array();
if ($response && isset($parsed_xml) && !$parsed_xml->faultstring && !$parsed_xml->Items->Request->Errors) {
foreach ($parsed_xml->Items->Item as $current) {
$item = array();
$item["DetailPageURL"] = $current->DetailPageURL;
$item["Title"] = $current->ItemAttributes->Title;
$item["Publisher"] = $current->ItemAttributes->Publisher;
if (isset($current->ItemAttributes->EAN)) {
$item["EAN"] = $current->ItemAttributes->EAN;
} else {
$item["Price"] = $current->ItemAttributes->ListPrice->FormattedPrice;
}
$item["Feature"] = $current->ItemAttributes->Feature;
$item["ImageURL"] = $current->MediumImage->URL;
$items[] = $item;
}
}
//var_dump($items);
if (count($items) == 0) {
return "";
}
return $items[mt_rand(0,count($items))];
}
function get_card() {
global $wpdb;
$cards = array();
// First, I try to get card on the database.
$card_rows = $wpdb->get_results("select card_for_index,card_for_page from link_cache where generated_at < NOW() and generated_at > SUBDATE(NOW(), INTERVAL 3600 SECOND)",ARRAY_A);
if (count($card_rows) != 0) {
$cards["index"] = $card_rows[0]["card_for_index"];
$cards["page"] = $card_rows[0]["card_for_page"];
return $cards;
}
// Get some keys from the database.
$key_rows = $wpdb->get_results("鍵の読みだし用のSQL文",ARRAY_A);
if (count($key_rows) != 0) {
$aws_access_key_id = $key_rows[0]["アクセスキー"];
$aws_secret_key = $key_rows[0]["秘密鍵"];
$amazon_associate_id = $key_rows[0]["アソシエイトID"];
} else {
return '';
}
$rows = $wpdb->get_results("select search_term from amazon_product_link where search_term is not null and disabled=0 order by rand() limit 0,1",ARRAY_A);
if (count($rows)==0) {
//echo "No rows. Abort here!\n";
return '';
}
$kws = $rows[0]['search_term'];
$params = array(
"Service" => "AWSECommerceService",
"Operation" => "ItemSearch",
"AWSAccessKeyId" => $aws_access_key_id,
"AssociateTag" => $amazon_associate_id,
"SearchIndex" => "All",
"ResponseGroup" => "Images,ItemAttributes,Offers",
"Keywords" => $kws
);
//echo "Keywords:".$kws."\n";
$context = stream_context_create(array(
'http' => array('ignore_errors' => true)));
$response = file_get_contents(create_url($params,$aws_secret_key),false,$context);
$pos = strpos($http_response_header[0], '200');
if ($pos === FALSE) {
// Workaround against an error.
$card_rows = $wpdb->get_results("select card_for_index,card_for_page from link_cache order by id desc limit 0,1",ARRAY_A);
if (count($card_rows) != 0) {
$cards["index"] = $card_rows[0]["card_for_index"];
$cards["page"] = $card_rows[0]["card_for_page"];
return $cards;
}
return '';
}
$item = parse_response($response,$http_response_header,1);
if ($item === "") {
return '';
}
$ean = '';
if (isset($item["EAN"])) {
$ean = 'EAN: '.$item["EAN"].'<br/>';
}
$price = '';
if (isset($item["Price"])) {
$price = 'Price: '.$item["Price"].'<br/>';
}
if (!isset($item["Title"])) {
error_log("Error! keyword=".urlencode($kws),0);
return '';
}
$feature_str = "";
$feature_max_count = 4;
$feature_count = 0;
if (count($item["Feature"]) > 0) {
$feature_str .= '<div style="border-top-style: solid;border-color: #1E3E8A;margin-top:4px;border-width:1px;padding-top:4px;text-align:left;">';
foreach ($item["Feature"] as $feature) {
if ($feature_count < $feature_max_count) {
$feature_str .= $feature."<br/>";
}
$feature_count++;
}
$feature_str .= '<br/><a href="'.$item["DetailPageURL"].'"><span style="color: #1E3E8A;font-size:85%;">Read more&gt;&gt;</span></a>';
$feature_str .= '</div>';
}
$cards["index"] = '<div style="width:305px;text-align:center;margin: 0 auto;">
<a href="'.$item["DetailPageURL"].'"><img src="'.$item["ImageURL"].'" align="left" style="margin-right:10px;margin-bottom:5px;"/></a><div style="margin-bottom:5px;"><a href="'.$item["DetailPageURL"].'"><span style="color:#1E3E8A;font-weight:bold;font-size:110%;">'.$item["Title"].'</span></a></div><br/>'.$item["Publisher"].'<br/>'.$ean.$price.$feature_str.'
<br clear="left"/>
</div>
<div class="clear"></div>';
$cards["page"] = "";
$wpdb->query("insert into link_cache(card_for_index,card_for_page) values('".$cards["index"]."','".$cards["page"]."')");
return $cards;
}
?>
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