使用 PHP 为 Amazon Shipping API 生成 AWS 签名答案

【问题标题】：Generate AWS signature for Amazon Shipping API using PHP使用 PHP 为 Amazon Shipping API 生成 AWS 签名
【发布时间】：2020-08-28 12:02:56
【问题描述】：

我正在尝试为 Authorization 标头生成签名以调用 Amazon Shipping API。还想知道是否有其他方法可以集成 Shippin API，因为亚马逊提供了不同的文档，但没有一个明确说明如何集成。他们的支持团队已告知使用 AWS 签名方法生成标头，但其 sdk 在 PHP 中不可用。

这是我生成签名的代码，但它总是导致 400 HTTP 错误。

$host               = "https://sellingpartnerapi-eu.amazon.com";
$accessKey          = ACCESS_KEY;
$secretKey          = SECRET_KEY;
$region             = "eu-west-1";
$service            = "execute-api";
$requestUrl         = "https://sellingpartnerapi-eu.amazon.com/shipping/v2/shipments/rates";
$uri                = 'shipping/v2/shipments/rates';

function calcualteAwsSignatureAndReturnHeaders($host, $uri, $requestUrl, 
            $accessKey, $secretKey, $region, $service, 
            $httpRequestMethod, $data, $debug = TRUE){

    $terminationString  = 'aws4_request';
    $algorithm      = 'AWS4-HMAC-SHA256';
    $phpAlgorithm       = 'sha256';
    $canonicalURI       = $uri;
    $canonicalQueryString   = '';
    $signedHeaders      = 'content-type;host;x-amz-date';


    $currentDateTime = new DateTime('UTC');
    $reqDate = $currentDateTime->format('Ymd');
    $reqDateTime = $currentDateTime->format('Ymd\THis\Z');

    // Create signing key
    $kSecret = $secretKey;
    $kDate = hash_hmac($phpAlgorithm, $reqDate, 'AWS4' . $kSecret, true);
    $kRegion = hash_hmac($phpAlgorithm, $region, $kDate, true);
    $kService = hash_hmac($phpAlgorithm, $service, $kRegion, true);
    $kSigning = hash_hmac($phpAlgorithm, $terminationString, $kService, true);

    // Create canonical headers
    $canonicalHeaders = array();
    $canonicalHeaders[] = 'content-type:application/x-www-form-urlencoded';
    $canonicalHeaders[] = 'host:' . $host;
    $canonicalHeaders[] = 'x-amz-date:' . $reqDateTime;
    $canonicalHeadersStr = implode("\n", $canonicalHeaders);

    // Create request payload
    $requestHasedPayload = hash($phpAlgorithm, $data);

    // Create canonical request
    $canonicalRequest = array();
    $canonicalRequest[] = $httpRequestMethod;
    $canonicalRequest[] = $canonicalURI;
    $canonicalRequest[] = $canonicalQueryString;
    $canonicalRequest[] = $canonicalHeadersStr . "\n";
    $canonicalRequest[] = $signedHeaders;
    $canonicalRequest[] = $requestHasedPayload;
    $requestCanonicalRequest = implode("\n", $canonicalRequest);
    $requestHasedCanonicalRequest = hash($phpAlgorithm, utf8_encode($requestCanonicalRequest));
    if($debug){
        echo "<h5>Canonical to string</h5>";
        echo "<pre>";
        echo $requestCanonicalRequest;
        echo "</pre>";
    }

    // Create scope
    $credentialScope = array();
    $credentialScope[] = $reqDate;
    $credentialScope[] = $region;
    $credentialScope[] = $service;
    $credentialScope[] = $terminationString;
    $credentialScopeStr = implode('/', $credentialScope);

    // Create string to signing
    $stringToSign = array();
    $stringToSign[] = $algorithm;
    $stringToSign[] = $reqDateTime;
    $stringToSign[] = $credentialScopeStr;
    $stringToSign[] = $requestHasedCanonicalRequest;
    $stringToSignStr = implode("\n", $stringToSign);
    if($debug){
        echo "<h5>String to Sign</h5>";
        echo "<pre>";
        echo $stringToSignStr;
        echo "</pre>";
    }

    // Create signature
    $signature = hash_hmac($phpAlgorithm, $stringToSignStr, $kSigning);

    // Create authorization header
    $authorizationHeader = array();
    $authorizationHeader[] = 'Credential=' . $accessKey . '/' . $credentialScopeStr;
    $authorizationHeader[] = 'SignedHeaders=' . $signedHeaders;
    $authorizationHeader[] = 'Signature=' . ($signature);
    $authorizationHeaderStr = $algorithm . ' ' . implode(', ', $authorizationHeader);


    // Request headers
    $headers = array();
    $headers[] = 'authorization:'.$authorizationHeaderStr;
    $headers[] = 'content-length:'.strlen($data);
    $headers[] = 'content-type: application/x-www-form-urlencoded';
    $headers[] = 'host: ' . $host;
    $headers[] = 'x-amz-date: ' . $reqDateTime;

    return $headers;
}

【问题讨论】：

标签： php amazon-product-api

【解决方案1】：

您需要在标题字段中添加“x-amz-access-token”

$headers = array();
$headers[] = 'authorization:'.$authorizationHeaderStr;
$headers[] = 'content-length:'.strlen($data);
$headers[] = 'content-type: application/json';
$headers[] = 'host: ' . $host;
$headers[] = 'x-amz-date: ' . $reqDateTime;
$headers[] = 'x-amz-access-token: ' . $reqToken;

您可以从https://api.amazon.com/auth/o2/token 生成 x-amz-access-token

【讨论】：