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<?php
namespace Aws\S3;
use Aws\Credentials\CredentialsInterface;
use GuzzleHttp\Psr7\Uri;
use Aws\Signature\SignatureTrait;
use Aws\Signature\SignatureV4 as SignatureV4;
use Aws\Api\TimestampShape as TimestampShape;
/**
* Encapsulates the logic for getting the data for an S3 object POST upload form
*
* @link http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPOST.html
* @link http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-post-example.html
*/
class PostObjectV4
{
use SignatureTrait;
private $client;
private $bucket;
private $formAttributes;
private $formInputs;
/**
* Constructs the PostObject.
*
* The options array accepts the following keys:
* @link http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html
*
* @param S3ClientInterface $client Client used with the POST object
* @param string $bucket Bucket to use
* @param array $formInputs Associative array of form input
* fields.
* @param array $options Policy condition options
* @param mixed $expiration Upload expiration time value. By
* default: 1 hour valid period.
*/
public function __construct(
S3ClientInterface $client,
$bucket,
array $formInputs,
array $options = [],
$expiration = '+1 hours'
) {
$this->client = $client;
$this->bucket = $bucket;
// setup form attributes
$this->formAttributes = [
'action' => $this->generateUri(),
'method' => 'POST',
'enctype' => 'multipart/form-data'
];
$credentials = $this->client->getCredentials()->wait();
if ($securityToken = $credentials->getSecurityToken()) {
array_push($options, ['x-amz-security-token' => $securityToken]);
$formInputs['X-Amz-Security-Token'] = $securityToken;
}
// setup basic policy
$policy = [
'expiration' => TimestampShape::format($expiration, 'iso8601'),
'conditions' => $options,
];
// setup basic formInputs
$this->formInputs = $formInputs + ['key' => '${filename}'];
// finalize policy and signature
$this->formInputs += $this->getPolicyAndSignature(
$credentials,
$policy
);
}
/**
* Gets the S3 client.
*
* @return S3ClientInterface
*/
public function getClient()
{
return $this->client;
}
/**
* Gets the bucket name.
*
* @return string
*/
public function getBucket()
{
return $this->bucket;
}
/**
* Gets the form attributes as an array.
*
* @return array
*/
public function getFormAttributes()
{
return $this->formAttributes;
}
/**
* Set a form attribute.
*
* @param string $attribute Form attribute to set.
* @param string $value Value to set.
*/
public function setFormAttribute($attribute, $value)
{
$this->formAttributes[$attribute] = $value;
}
/**
* Gets the form inputs as an array.
*
* @return array
*/
public function getFormInputs()
{
return $this->formInputs;
}
/**
* Set a form input.
*
* @param string $field Field name to set
* @param string $value Value to set.
*/
public function setFormInput($field, $value)
{
$this->formInputs[$field] = $value;
}
private function generateUri()
{
$uri = new Uri($this->client->getEndpoint());
if ($this->client->getConfig('use_path_style_endpoint') === true
|| ($uri->getScheme() === 'https'
&& strpos($this->bucket, '.') !== false)
) {
// Use path-style URLs
$uri = $uri->withPath("/{$this->bucket}");
} else {
// Use virtual-style URLs if haven't been set up already
if (strpos($uri->getHost(), $this->bucket . '.') !== 0) {
$uri = $uri->withHost($this->bucket . '.' . $uri->getHost());
}
}
return (string) $uri;
}
protected function getPolicyAndSignature(
CredentialsInterface $credentials,
array $policy
){
$ldt = gmdate(SignatureV4::ISO8601_BASIC);
$sdt = substr($ldt, 0, 8);
$policy['conditions'][] = ['X-Amz-Date' => $ldt];
$region = $this->client->getRegion();
$scope = $this->createScope($sdt, $region, 's3');
$creds = "{$credentials->getAccessKeyId()}/$scope";
$policy['conditions'][] = ['X-Amz-Credential' => $creds];
$policy['conditions'][] = ['X-Amz-Algorithm' => "AWS4-HMAC-SHA256"];
$jsonPolicy64 = base64_encode(json_encode($policy));
$key = $this->getSigningKey(
$sdt,
$region,
's3',
$credentials->getSecretKey()
);
return [
'X-Amz-Credential' => $creds,
'X-Amz-Algorithm' => "AWS4-HMAC-SHA256",
'X-Amz-Date' => $ldt,
'Policy' => $jsonPolicy64,
'X-Amz-Signature' => bin2hex(
hash_hmac('sha256', $jsonPolicy64, $key, true)
),
];
}
}