(Visual Basic 6.0) 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 ChilkatRest

' Connect to the Amazon AWS REST server in the desired region.
Dim bTls As Long
bTls = 1
Dim port As Long
port = 443
Dim bAutoReconnect As Long
bAutoReconnect = 1
Dim success As Long
success = rest.Connect("s3-us-west-2.amazonaws.com",port,bTls,bAutoReconnect)

' Provide AWS credentials.
Dim authAws As New ChilkatAuthAws
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
responseJsonStr = rest.FullRequestNoBody("GET","/?policy")
If (rest.LastMethodSuccess <> 1) Then
    Debug.Print 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.
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "response body: " & responseJsonStr
    Debug.Print "---"
    Debug.Print "LastRequestStartLine: " & rest.LastRequestStartLine
    Debug.Print "LastRequestHeader: " & rest.LastRequestHeader
End If

Debug.Print "response body: " & responseJsonStr

' Load the JSON and display in a more human-readable manner:
Dim json As New ChilkatJsonObject
success = json.Load(responseJsonStr)
json.EmitCompact = 0
Debug.Print json.Emit()

' Sample output:

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