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(PHP Extension) AWS S3 File Streaming UploadDemonstrates how to do a streaming upload from a file to the AWS S3 storage service. The AWS authorization presents some difficulties when the REST request body is to be streamed from a file (or from some other source). The issue is that the SHA-256 hash of the file data must be calculated. There are only two possible ways to do this: (1) stream the file into memory in its entirety and calculate the SHA-256 hash prior to uploading, or (2) pre-calculate the SHA-256 in a streaming fashion, and then provide it to the AWS authentication object. If the application does NOT pre-compute the SHA-256, then Chilkat (internally) is forced to stream into memory, calculate the SHA-256, and then upload from the in-memory copy of the file.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This first part is optional. AWS authentication requires // the SHA-256 hash of the request body (i.e. the contents of the file // to be uploaded). We can choose to pre-calculate the SHA-256 in a streaming fashion // and then provide it to the authenticator object. This way, if the file is // extremely large, it never needs to completely reside in memory. $crypt = new CkCrypt2(); $crypt->put_EncodingMode('hex'); $crypt->put_HashAlgorithm('sha-256'); $fileToUploadPath = 'qa_data/xml/hamlet.xml'; $hashStr = $crypt->hashFileENC($fileToUploadPath); $rest = new CkRest(); // Connect to the Amazon AWS REST server. $bTls = true; $port = 443; $bAutoReconnect = true; $success = $rest->Connect('s3.amazonaws.com',$port,$bTls,$bAutoReconnect); // ---------------------------------------------------------------------------- // Important: For buckets created in regions outside us-east-1, // there are three important changes that need to be made. // See Working with S3 Buckets in Non-us-east-1 Regions for the details. // ---------------------------------------------------------------------------- // Provide AWS credentials for the REST call. $authAws = new CkAuthAws(); $authAws->put_AccessKey('AWS_ACCESS_KEY'); $authAws->put_SecretKey('AWS_SECRET_KEY'); $authAws->put_ServiceName('s3'); // Provide the pre-computed SHA-256 here: $authAws->put_PrecomputedSha256($hashStr); $success = $rest->SetAuthAws($authAws); // Set the bucket name via the HOST header. // In this case, the bucket name is "chilkat100". $rest->put_Host('chilkat100.s3.amazonaws.com'); $fileStream = new CkStream(); $fileStream->put_SourceFile($fileToUploadPath); // Upload to the S3 Storage service. // If the application provided the SHA-256 hash of the file contents (as shown above) // then file is streamed and never has to completely reside in memory. // If the application did NOT provide the SHA-256, then Chilkat will (internally) // load the entire file into memory, calculate the SHA-256, and then upload. $responseStr = $rest->fullRequestStream('PUT','/hamlet.xml',$fileStream); if ($rest->get_LastMethodSuccess() != true) { print $rest->lastErrorText() . "\n"; exit; } // When successful, the S3 Storage service will respond with a 200 response code, // with an XML body. if ($rest->get_ResponseStatusCode() == 200) { print $responseStr . "\n"; print 'File uploaded.' . "\n"; } else { // Examine the request/response to see what happened. print 'response status code = ' . $rest->get_ResponseStatusCode() . "\n"; print 'response status text = ' . $rest->responseStatusText() . "\n"; print 'response header: ' . $rest->responseHeader() . "\n"; print 'response body: ' . $responseStr . "\n"; print '---' . "\n"; print 'LastRequestStartLine: ' . $rest->lastRequestStartLine() . "\n"; print 'LastRequestHeader: ' . $rest->lastRequestHeader() . "\n"; } ?> |
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