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AmbiguousSuccessParser.php
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ApplyChecksumMiddleware.php
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BatchDelete.php
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BucketEndpointArnMiddleware.php
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BucketEndpointMiddleware.php
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CalculatesChecksumTrait.php
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Crypto
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EndpointRegionHelperTrait.php
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GetBucketLocationParser.php
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MultipartCopy.php
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MultipartUploader.php
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MultipartUploadingTrait.php
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ObjectCopier.php
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ObjectUploader.php
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PermanentRedirectMiddleware.php
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PostObject.php
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PostObjectV4.php
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PutObjectUrlMiddleware.php
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RegionalEndpoint
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RetryableMalformedResponseParser.php
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S3Client.php
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S3ClientInterface.php
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S3ClientTrait.php
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S3EndpointMiddleware.php
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S3MultiRegionClient.php
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S3UriParser.php
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SSECMiddleware.php
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StreamWrapper.php
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Transfer.php
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UseArnRegion
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ValidateResponseChecksumParser.php
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Editing: PostObjectV4.php
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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()) { $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) ), ]; } }