litespeed php 不会为亚马逊产品 API 生成正确签名的请求，常规 php 工作正常

Question

我直接从亚马逊的便签本 (https://webservices.amazon.com/paapi5/scratchpad/index.html) 中获取了下面的 PHP 代码，他们在其中提供样板代码来查询他们的产品 API。我只是稍微修改了一下以显示 HTTP 错误 - 其他一切都是直接复制和粘贴。

我输入了自己的凭据（访问密钥、秘密密钥和合作伙伴标签），代码在我自己的 macOS 笔记本电脑上运行完美，运行（常规）PHP 7.1.23。

我把代码移到我的个人服务器上，运行完美，运行 PHP 5.3.10-1ubuntu3.26

当我将相同的代码移动到客户的服务器时，我收到来自亚马逊的错误消息，指出请求未正确签名。错误是：

{"__type":"com.amazon.paapi5#InvalidSignatureException","Errors":[{"Code":"InvalidSignature","Message":"The request has not been correctly signed. If you are using an AWS SDK, requests are signed for you automatically; otherwise, go to https://webservices.amazon.com/paapi5/documentation/sending-request.html#signing."}]}

在那台机器上，lsphp --version returns

PHP 7.0.27 (litespeed) (built: Jan  4 2018 16:01:06)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
    with Zend OPcache v7.0.27, Copyright (c) 1999-2017, by Zend Technologies

直接来自亚马逊的确切代码是：

<?php

/* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. */
/* Licensed under the Apache License, Version 2.0. */

// Put your Secret Key in place of **********
$serviceName="ProductAdvertisingAPI";
$region="us-east-1";
$accessKey="*****";
$secretKey="*****";
$payload="{"
        ." \"ItemIds\": ["
        ."  \"0995198918\""
        ." ],"
        ." \"Resources\": ["
        ."  \"Images.Primary.Small\","
        ."  \"Images.Primary.Medium\","
        ."  \"Images.Primary.Large\","
        ."  \"Images.Variants.Small\","
        ."  \"Images.Variants.Medium\","
        ."  \"Images.Variants.Large\""
        ." ],"
        ." \"PartnerTag\": \"*****\","
        ." \"PartnerType\": \"Associates\","
        ." \"Marketplace\": \"www.amazon.com\""
        ."}";
$host="webservices.amazon.com";
$uriPath="/paapi5/getitems";
$awsv4 = new AwsV4 ($accessKey, $secretKey);
$awsv4->setRegionName($region);
$awsv4->setServiceName($serviceName);
$awsv4->setPath ($uriPath);
$awsv4->setPayload ($payload);
$awsv4->setRequestMethod ("POST");
$awsv4->addHeader ('content-encoding', 'amz-1.0');
$awsv4->addHeader ('content-type', 'application/json; charset=utf-8');
$awsv4->addHeader ('host', $host);
$awsv4->addHeader ('x-amz-target', 'com.amazon.paapi5.v1.ProductAdvertisingAPIv1.GetItems');
$headers = $awsv4->getHeaders ();
$headerString = "";
foreach ( $headers as $key => $value ) {
    $headerString .= $key . ': ' . $value . "\r\n";
}
$params = array (
        'http' => array (
            'ignore_errors' => true, 
            'header' => $headerString,
            'method' => 'POST',
            'content' => $payload
        )
    );
$stream = stream_context_create ( $params );

$fp = fopen ( 'https://'.$host.$uriPath, 'rb', false, $stream );

$response = stream_get_contents ( $fp );

echo $response;

if (! $fp) {
    throw new Exception ( "Exception Occured" );
}
$response = stream_get_contents ( $fp );
if ($response === false) {
    throw new Exception ( "Exception Occured" );
}
echo $response;

class AwsV4 {

    private $accessKey = null;
    private $secretKey = null;
    private $path = null;
    private $regionName = null;
    private $serviceName = null;
    private $httpMethodName = null;
    private $queryParametes = array ();
    private $awsHeaders = array ();
    private $payload = "";

    private $HMACAlgorithm = "AWS4-HMAC-SHA256";
    private $aws4Request = "aws4_request";
    private $strSignedHeader = null;
    private $xAmzDate = null;
    private $currentDate = null;

    public function __construct($accessKey, $secretKey) {
        $this->accessKey = $accessKey;
        $this->secretKey = $secretKey;
        $this->xAmzDate = $this->getTimeStamp ();
        $this->currentDate = $this->getDate ();
    }

    function setPath($path) {
        $this->path = $path;
    }

    function setServiceName($serviceName) {
        $this->serviceName = $serviceName;
    }

    function setRegionName($regionName) {
        $this->regionName = $regionName;
    }

    function setPayload($payload) {
        $this->payload = $payload;
    }

    function setRequestMethod($method) {
        $this->httpMethodName = $method;
    }

    function addHeader($headerName, $headerValue) {
        $this->awsHeaders [$headerName] = $headerValue;
    }

    private function prepareCanonicalRequest() {
        $canonicalURL = "";
        $canonicalURL .= $this->httpMethodName . "\n";
        $canonicalURL .= $this->path . "\n" . "\n";
        $signedHeaders = '';
        foreach ( $this->awsHeaders as $key => $value ) {
            $signedHeaders .= $key . ";";
            $canonicalURL .= $key . ":" . $value . "\n";
        }
        $canonicalURL .= "\n";
        $this->strSignedHeader = substr ( $signedHeaders, 0, - 1 );
        $canonicalURL .= $this->strSignedHeader . "\n";
        $canonicalURL .= $this->generateHex ( $this->payload );
        return $canonicalURL;
    }

    private function prepareStringToSign($canonicalURL) {
        $stringToSign = '';
        $stringToSign .= $this->HMACAlgorithm . "\n";
        $stringToSign .= $this->xAmzDate . "\n";
        $stringToSign .= $this->currentDate . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "\n";
        $stringToSign .= $this->generateHex ( $canonicalURL );
        return $stringToSign;
    }

    private function calculateSignature($stringToSign) {
        $signatureKey = $this->getSignatureKey ( $this->secretKey, $this->currentDate, $this->regionName, $this->serviceName );
        $signature = hash_hmac ( "sha256", $stringToSign, $signatureKey, true );
        $strHexSignature = strtolower ( bin2hex ( $signature ) );
        return $strHexSignature;
    }

    public function getHeaders() {
        $this->awsHeaders ['x-amz-date'] = $this->xAmzDate;
        ksort ( $this->awsHeaders );

        // Step 1: CREATE A CANONICAL REQUEST
        $canonicalURL = $this->prepareCanonicalRequest ();

        // Step 2: CREATE THE STRING TO SIGN
        $stringToSign = $this->prepareStringToSign ( $canonicalURL );

        // Step 3: CALCULATE THE SIGNATURE
        $signature = $this->calculateSignature ( $stringToSign );

        // Step 4: CALCULATE AUTHORIZATION HEADER
        if ($signature) {
            $this->awsHeaders ['Authorization'] = $this->buildAuthorizationString ( $signature );
            return $this->awsHeaders;
        }
    }

    private function buildAuthorizationString($strSignature) {
        return $this->HMACAlgorithm . " " . "Credential=" . $this->accessKey . "/" . $this->getDate () . "/" . $this->regionName . "/" . $this->serviceName . "/" . $this->aws4Request . "," . "SignedHeaders=" . $this->strSignedHeader . "," . "Signature=" . $strSignature;
    }

    private function generateHex($data) {
        return strtolower ( bin2hex ( hash ( "sha256", $data, true ) ) );
    }

    private function getSignatureKey($key, $date, $regionName, $serviceName) {
        $kSecret = "AWS4" . $key;
        $kDate = hash_hmac ( "sha256", $date, $kSecret, true );
        $kRegion = hash_hmac ( "sha256", $regionName, $kDate, true );
        $kService = hash_hmac ( "sha256", $serviceName, $kRegion, true );
        $kSigning = hash_hmac ( "sha256", $this->aws4Request, $kService, true );

        return $kSigning;
    }

    private function getTimeStamp() {
        return gmdate ( "Ymd\THis\Z" );
    }

    private function getDate() {
        return gmdate ( "Ymd" );
    }
}
?>

lsphp 可执行文件有何不同之处阻止它生成正确签名的请求？

Answer 1

正如@esqew 所建议的那样，服务器上的时间偏移了大约 5 分钟，这导致 GMT 时间也偏移了，然后我猜亚马逊不喜欢这个请求。

一旦我们调整示例亚马逊代码完美运行，一切都很好！

非常感谢，

Answer 2

如评论中所述，如果服务器时间与实际当前时间相差很大，哈希函数将产生亚马逊将拒绝的错误结果。

重新配置服务器以使用网络同步其时钟，或手动调整以反映正确的时间，以便 PHP 的 date/time 功能开始返回正确的时间。

litespeed php 不会为亚马逊产品 API 生成正确签名的请求，常规 php 工作正常

litespeed php will not generate a correctly signed request for Amazon product API, regular php works fine

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