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VB.NET Examples

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(VB.NET) S3 Get Bucket Policy

Demonstrates how to send a GET request to fetch the policy of a specified bucket. The following information is quoted from the AWS REST API reference documentation at http://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketGETpolicy.html

To use this operation, you must have GetPolicy permissions on the specified bucket, and you must be the bucket owner.

If you don't have GetPolicy permissions, Amazon S3 returns a 403 Access Denied error. If you have the correct permissions, but you're not the bucket owner, Amazon S3 returns a 405 Method Not Allowed error. If the bucket does not have a policy, Amazon S3 returns a 404 Policy Not found error. There are restrictions about who can create bucket policies and which objects in a bucket they can apply to. For more information, go to Using Bucket Policies.

Important: This example requires Chilkat v9.5.0.66 or greater.

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

'  Important: This example requires Chilkat v9.5.0.66 or greater.

Dim rest As New Chilkat.Rest

'  Connect to the Amazon AWS REST server in the desired region.
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
Dim success As Boolean = rest.Connect("s3-us-west-2.amazonaws.com",port,bTls,bAutoReconnect)

'  Provide AWS credentials.
Dim authAws As New 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"

'  Get the policy.
Dim responseJsonStr As String = rest.FullRequestNoBody("GET","/?policy")
If (rest.LastMethodSuccess <> True) Then
    Console.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  When successful, the S3 Storage service will respond with a 200 response code,
'  with an XML body.
If (rest.ResponseStatusCode <> 200) Then
    '  Examine the request/response to see what happened.
    Console.WriteLine("response status code = " & rest.ResponseStatusCode)
    Console.WriteLine("response status text = " & rest.ResponseStatusText)
    Console.WriteLine("response header: " & rest.ResponseHeader)
    Console.WriteLine("response body: " & responseJsonStr)
    Console.WriteLine("---")
    Console.WriteLine("LastRequestStartLine: " & rest.LastRequestStartLine)
    Console.WriteLine("LastRequestHeader: " & rest.LastRequestHeader)
End If


Console.WriteLine("response body: " & responseJsonStr)

'  Load the JSON and display in a more human-readable manner:
Dim json As New Chilkat.JsonObject
json.Load(responseJsonStr)
json.EmitCompact = False
Console.WriteLine(json.Emit())

'  Sample output:

'  	{
'  	  "Version": "2012-10-17",
'  	  "Statement": [
'  	    {
'  	      "Effect": "Allow",
'  	      "Resource": "arn:aws:s3.asp">chilkat.ocean/",
'  	      "Principal": "*"
'  	    }
'  	  ]
'  	}
' 

 

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