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adds truncated signature example for PHP (#131)

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* adds truncated signature example for PHP

* split truncated signature in a separate file
This commit is contained in:
Marius Cristea 2019-01-21 11:53:26 +02:00 committed by Sergey Alexandrovich
parent ae3d6f7a50
commit d3371e95b7
1 changed files with 33 additions and 0 deletions
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examples/signature-truncated.php Normal file
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<?php
define('IMGPROXY_SIGNATURE_SIZE', 8 );
$key = '943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881';
$salt = '520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5';
$keyBin = pack("H*" , $key);
if(empty($keyBin)) {
die('Key expected to be hex-encoded string');
}
$saltBin = pack("H*" , $salt);
if(empty($saltBin)) {
die('Salt expected to be hex-encoded string');
}
$resize = 'fill';
$width = 300;
$height = 300;
$gravity = 'no';
$enlarge = 1;
$extension = 'png';
$url = 'http://img.example.com/pretty/image.jpg';
$encodedUrl = rtrim(strtr(base64_encode($url), '+/', '-_'), '=');
$path = "/{$resize}/{$width}/{$height}/{$gravity}/{$enlarge}/{$encodedUrl}.{$extension}";
$signature = hash_hmac('sha256', $saltBin.$path, $keyBin, true);
$signature = pack('A'.IMGPROXY_SIGNATURE_SIZE, $signature);
$signature = rtrim(strtr(base64_encode($signature), '+/', '-_'), '=');
print(sprintf("/%s%s", $signature, $path));