php - 使用 php 的 Azure 共享访问签名错误

Question

我正在使用 SAS 尝试使用 php 从私有(private) Azure 存储容器下载 blob。但它总是让我犯同样的错误。

<Error>
<Code>AuthenticationFailed</Code>
<Message>
Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature. ...
</Message>
<AuthenticationErrorDetail>
Signature did not match. String to sign used ... /blob/name/container/archive.jpg
</AuthenticationErrorDetail>
</Error>

这是我的代码:

static private function getSASForBlob($accountName,$containerName, $fileName, $resourceType, $permissions, $expiry) {
     /* Create the signature */         

        $_arraysign = array();
        $_arraysign[] = $permissions;
        $_arraysign[] = '';
        $_arraysign[] = $expiry;
        $_arraysign[] = $accountName . '/' . $containerName . '/' . $fileName;
        $_arraysign[] = '';
        $_arraysign[] = "2015-04-05"; //the API version is now required
        $_arraysign[] = '';
        $_arraysign[] = '';
        $_arraysign[] = '';
        $_arraysign[] = '';
        $_arraysign[] = '';

        $_str2sign = implode("\n", $_arraysign);

        return base64_encode(
        hash_hmac('sha256', urldecode(utf8_encode($_str2sign)), base64_decode($key), true)
    );
    }
    static public function getBlobDownloadUrl($container,$blob,$accountName,$key){
 /* Create the signed query part */         
        $resourceType='b';
        $permissions='r';
        /*$expTime_utc = new DateTime(null, new DateTimeZone("UTC"));
        $expTime_utc->add(new DateInterval('PT1H'));
        $expiry=$expTime_utc->format('Y-m-d\TH:i:s\Z');*/
        $expiry = date('Y-m-d\TH:i:s\Z', strtotime('+1 day'));
        $_signature=AzureServices::getSASForBlob($accountName,$key,$container, $blob, $resourceType, $permissions, $expiry);
        $_parts = array();
        $_parts[] = (!empty($expiry))?'se=' . urlencode($expiry):'';
        $_parts[] = 'sr=' . $resourceType;
        $_parts[] = (!empty($permissions))?'sp=' . $permissions:'';
        $_parts[] = 'sig=' . urlencode($_signature);
        $_parts[] = "sv=2015-04-05";

        /* Create the signed blob URL */
        $_url = 'https://'
        .$accountName.'.blob.core.windows.net/'
        . $container . '/'
        . $blob . '?'
        . implode('&', $_parts);

        return $_url;
    }

我尝试按照相同的结构将日期更改为 DateTime，在“$_arraysign[] = $accountName . '/' . $containerName . '/' . $fileName” 行中添加和删除“/”。 ..但是什么也没发生，显示了相同的错误消息...... 请帮我。 谢谢

Answer 1

由于您在2015-04-05中使用了signedversion，所以除了@Gaurav Mantri的答案之外，还有一点您需要注意，是根据https://msdn.microsoft.com/en-us/library/azure/dn140255.aspx中构建签名字符串部分的描述:

Version 2015-04-05 adds support for the signed IP and signed protocol fields. These must be included in the string-to-sign. To construct the string-to-sign for Blob or File service resources, use the following format:

StringToSign = signedpermissions + "\n" +
           signedstart + "\n" +
           signedexpiry + "\n" +
           canonicalizedresource + "\n" +
           signedidentifier + "\n" +
           signedIP + "\n" +
           signedProtocol + "\n" +
           signedversion + "\n" +
           rscc + "\n" +
           rscd + "\n" +
           rsce + "\n" +
           rscl + "\n" +
           rsct

所以我们需要将函数getSASForBlob中的$_arraysign修改为:

$_arraysign = array();
$_arraysign[] = $permissions;
$_arraysign[] = '';
$_arraysign[] = $expiry;
$_arraysign[] = '/blob/' . $accountName . '/' . $container . '/' . $blob;
$_arraysign[] = '';
$_arraysign[] = '';
$_arraysign[] = '';
$_arraysign[] = "2015-04-05"; //the API version is now required
$_arraysign[] = '';
$_arraysign[] = '';
$_arraysign[] = '';
$_arraysign[] = '';
$_arraysign[] = '';

如有任何进一步的疑问，请随时告诉我。