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(PHP ActiveX) S3 Get Object Metadata, such as ETagDemonstrates how to get an S3 object's metadata using a HEAD request.
<?php // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rest') $rest = new COM("Chilkat.Rest"); // Connect to the Amazon AWS REST server in the desired region. // In this case we connect to S3 in the "us-west-2" region. $bTls = 1; $port = 443; $bAutoReconnect = 1; $success = $rest->Connect('s3-us-west-2.amazonaws.com',$port,$bTls,$bAutoReconnect); // Provide AWS credentials. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.AuthAws') $authAws = new COM("Chilkat.AuthAws"); $authAws->AccessKey = 'AWS_ACCESS_KEY'; $authAws->SecretKey = 'AWS_SECRET_KEY'; $authAws->ServiceName = 's3'; // This particular bucket is in the Oregon region, as opposed to the US Standard, // therefore the Region must be set appropriately. // Also note that we connected to "s3-us-west-2.amazonaws.com". $authAws->Region = 'us-west-2'; $success = $rest->SetAuthAws($authAws); // Note: The above REST connection and setup of the AWS credentials // can be done once. After connecting, any number of REST calls can be made. // The "auto reconnect" property passed to rest.Connect indicates that if // the connection is lost, a REST method call will automatically reconnect // if needed. // -------------------------------------------------------------------------- // Set the bucket name via the HOST header. // In this case, the bucket name is "chilkat.ocean". // Note that the Host header should use "bucketName.s3.amazonaws.com", not "bucketName.s3-us-west-2.amazonaws.com" $rest->Host = 'chilkat.ocean.s3.amazonaws.com'; // Our object is "starfish.jpg". // Get the metadata. // Since we are sending a HEAD request, we shouldn't use any of the Full* methods. // Instead, send the request, then just read the response header. $success = $rest->SendReqNoBody('HEAD','/starfish.jpg'); if ($success != 1) { print $rest->LastErrorText . "\n"; exit; } // Now get the response header. $statusCode = $rest->ReadResponseHeader(); if ($statusCode < 0) { print $rest->LastErrorText . "\n"; exit; } // When successful, the S3 Storage service will respond with a 200 response code, // with an XML body. if ($statusCode != 200) { // Examine the request/response to see what happened. print 'response status code = ' . $statusCode . "\n"; print 'response status text = ' . $rest->ResponseStatusText . "\n"; print 'response header: ' . $rest->ResponseHeader . "\n"; exit; } // The response header contains information about the S3 object. // For example: // HTTP/1.1 200 OK // x-amz-id-2: GrV/hrB2EUkBlWc0h3JDdmVIrYDXfPC7CGvo/qSVRmYRPwilAOry8+4r2YWl4xJfa1HRYXrP808= // x-amz-request-id: 4BDC6D6AEA0BDEF3 // Date: Mon, 13 May 2019 22:03:13 GMT // Last-Modified: Mon, 10 Nov 2014 16:10:23 GMT // ETag: "2e9c59dbf2662367dc97dfdda85da048" // Accept-Ranges: bytes // Content-Type: image/jpg // Content-Length: 6229 // Server: AmazonS3 // Get the ETag response header value: $etag = $rest->responseHdrByName('ETag'); print 'ETag: ' . $etag . "\n"; ?> |
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