AutoIt

S3 Get Object Metadata, such as ETag

See more Amazon S3 (new) Examples

Demonstrates how to get an S3 object's metadata using a HEAD request. AutoIt

Local $bSuccess = False

;  This example requires the Chilkat API to have been previously unlocked.
;  See Global Unlock Sample for sample code.

$oRest = ObjCreate("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.
Local $bTls = True
Local $iPort = 443
Local $bAutoReconnect = True
$bSuccess = $oRest.Connect("s3-us-west-2.amazonaws.com",$iPort,$bTls,$bAutoReconnect)

;  Provide AWS credentials.
$oAuthAws = ObjCreate("Chilkat.AuthAws")
$oAuthAws.AccessKey = "AWS_ACCESS_KEY"
$oAuthAws.SecretKey = "AWS_SECRET_KEY"
$oAuthAws.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".
$oAuthAws.Region = "us-west-2"

$bSuccess = $oRest.SetAuthAws($oAuthAws)

;  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"
$oRest.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.
$bSuccess = $oRest.SendReqNoBody("HEAD","/starfish.jpg")
If ($bSuccess <> True) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

;  Now get the response header.
Local $iStatusCode = $oRest.ReadResponseHeader()
If ($iStatusCode < 0) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

;  When successful, the S3 Storage service will respond with a 200 response code,
;  with an XML body.  
If ($iStatusCode <> 200) Then
    ;  Examine the request/response to see what happened.
    ConsoleWrite("response status code = " & $iStatusCode & @CRLF)
    ConsoleWrite("response status text = " & $oRest.ResponseStatusText & @CRLF)
    ConsoleWrite("response header: " & $oRest.ResponseHeader & @CRLF)
    Exit
EndIf

;  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:
Local $sEtag = $oRest.ResponseHdrByName("ETag")
ConsoleWrite("ETag: " & $sEtag & @CRLF)