Eu tento criar um SAS para um blob no armazenamento azul no php. Eu escrevo o seguinte código:

$key ="...";

$end = date('Y-m-d\TH\:i\:s\Z', strtotime('+1 day'));

function getSASForBlob($accountName, $container, $blob, $permissions ,$expiry, $key){
 /* Create the signature */
 $_arraysign = array();
 $_arraysign[] = $permissions;
 $_arraysign[] = '';
 $_arraysign[] = $expiry;
 $_arraysign[] = '/'.$accountName . '/' . $container . '/' . $blob;
 $_arraysign[] = '';
 $_arraysign[] = "2015-12-11"; //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));
}

function getBlobUrl($accountName, $container, $blob, $resourceType, $permissions, $expiry, $_signature){
 /* Create the signed query part */
 $_parts = array();
 $_parts[] = 'sv=2015-12-11';

 $_parts[] = 'ss=b';
 $_parts[] = 'srt=' . $resourceType;
 $_parts[] = (!empty($permissions))?'sp=' . $permissions:'';
 $_parts[] = (!empty($expiry))?'se=' .$expiry:'';
 $_parts[] = 'spr=https';
 $_parts[] = 'sig=' . urlencode($_signature);


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

 return $_url;
 }


$sig = getSASForBlob("cloudviewer","450-423-422-392", "thumbnail.jpeg", "r",     $end, $key);
$url = getBlobUrl("cloudviewer","450-423-422-392","thumbnail.jpeg","o","r", $end, $sig);

echo(json_encode(array('url' => $url, 'sig' => $sig, 'expiry' => $end)));

o resultado do URL que recebi é:https://cloudviewer.blob.core.windows.net/450-423-422-392/thumbnail.jpeg?sv=2015-12-11&ss=b&srt=o&sp=r&se=2016-12-09T17:08:25Z&spr= https & sig = BU6lfFljKLsmK8zPdHny5qRU9XStpE97Pud5vj4biEY% 3D

com um erro de autenticação: a assinatura não corresponde. A sequência de caracteres usada para assinar foi o cloudviewer r b o 2016-12-09T17: 08: 25Z https 2015-12-11

Crio um SAS diretamente do Azure e tive o URLhttps://cloudviewer.blob.core.windows.net/450-423-422-392/thumbnail.jpeg?sv=2015-12-11&ss=b&srt=o&sp=r&se=2016-12-09T17:28:32Z&st= 2016-12-08T15: 28: 32Z & spr = https & sig = EgnmcRSSKol% 2BqR2A4aBdFhL9dmkhGJVHOw9W% 2BC8% 2FTKI% 3D que funciona e seja semelhante ao primeiro.

Eu já tento

$_arraysign[] = '/blob/'.$accountName . '/' . $container . '/' . $blob;
$_arraysign[] = $accountName . '/' . $container . '/' . $blob;

Você tem alguma ideia ?

obrigado