Google Cloud Storage 签名网址 - SignatureDoesNotMatch [英] Google Cloud Storage Signed Url - SignatureDoesNotMatch

问题描述

Im able to put a file (image.png) on to my Google Cloud Storage bucket using the google-api-php-client, but now im having trouble trying to create a signed url to get access to the file from my website. Sample code:

$bucketName = 'bucket-name';
$id = 'image.png';
$serviceAccountName = '[e-mail]';
$privateKey = file_get_contents($location_to_key_file);
$signer = new Google_P12Signer($privateKey, "notasecret");
$ttl = time() + 3600;
$stringToSign = "GET
" . "
" . "
" . $ttl . "
". '/' . $bucketName . '/' . $id;
$signature = $signer->sign(utf8_encode($stringToSign));
$finalSignature = Google_Utils::urlSafeB64Encode($signature);
$host = "https://".$bucketName.".storage.googleapis.com";
echo  $host. "/".$id."?GoogleAccessId=" . $serviceAccountName . "&Expires=" . $ttl . "&Signature=" . $finalSignature;

Returns:

<Error><Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your  Google secret key and signing method.</Message>
<StringToSign>
GET 1387590477 /bucketname/image.png</StringToSign></Error>

im using google-api-php-client with php 5.5

ive followed a few examples:

https://groups.google.com/forum/#!topic/gs-discussion/EjPRAWbWKbw

https://groups.google.com/forum/#!msg/google-api-php-client/jaRYDWdpteQ/xbNTLfDhUggJ

Maybe a config value im not passing correctly ? i assume the Service Account email should be used. Also tried to include md5hash and content-type in the $stringToSign, same results.

any help/tips would be appreciated.

解决方案

The rdb almost do the trick for me. I used a working python example from GoogleCloudPlatform for python in order to debug what was wrong with the url and find the following:

• The GoogleAccessId have to be urlencoded
• You've to replace in the Signature the following characters: '-' => '%2B', '_' => '%2F
• The signature must end with '%3D'

Code:

$host. "/".$id."?Expires=" . $ttl . "&GoogleAccessId=" . 
        urlencode($serviceAccountName) . "&Signature=" . 
        str_replace(array('-','_',), array('%2B', '%2F'),urlencode($finalSignature)).'%3D';

Now the url should work and you can use some advanced operators like response-content-disposition or response-content-type

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