(VB.NET) Amazon Glacier Get Vault Access Policy

Demonstrates how to retrieve the access-policy subresource set on the vault

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

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("glacier.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 = "glacier"
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.
' --------------------------------------------------------------------------

' 
' For more information, see Glacier Get Vault Access Policy Reference Documentation
' 
rest.AddHeader("x-amz-glacier-version","2012-06-01")

' Get the access policy for the "chilkat" vault.
Dim sbResponseBody As New Chilkat.StringBuilder
success = rest.FullRequestNoBodySb("GET","/AWS_ACCOUNT_ID/vaults/chilkat/access-policy",sbResponseBody)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Dim respStatusCode As Integer = rest.ResponseStatusCode
If (respStatusCode >= 400) Then
    Debug.WriteLine("Response Status Code = " & respStatusCode)
    Debug.WriteLine("Response Header:")
    Debug.WriteLine(rest.ResponseHeader)
    Debug.WriteLine("Response Body:")
    Debug.WriteLine(sbResponseBody.GetAsString())
    Exit Sub
End If


' Success is indicated by a 200 response status.
Debug.WriteLine("response status code = " & respStatusCode)

Dim json As New Chilkat.JsonObject
json.LoadSb(sbResponseBody)
json.EmitCompact = False

' Returns JSON such as this:
' {
'   "Policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"Define-owner-access-rights\",\"Effect\":\"Allow\",\"Principal\":{\"AWS\":\"arn:aws:iam::9999999999999:root\"},\"Action\":\"glacier:DeleteArchive\",\"Resource\":\"arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat\"}]}"
' }

' Unwrap...
Dim jsonPolicy As New Chilkat.JsonObject
jsonPolicy.Load(json.StringOf("Policy"))
jsonPolicy.EmitCompact = False

Debug.WriteLine(jsonPolicy.Emit())
Debug.WriteLine("----")

' The jsonPolicy contains:

' {
'   "Version": "2012-10-17",
'   "Statement": [
'     {
'       "Sid": "Define-owner-access-rights",
'       "Effect": "Allow",
'       "Principal": {
'         "AWS": "arn:aws:iam::9999999999999:root"
'       },
'       "Action": "glacier:DeleteArchive",
'       "Resource": "arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat"
'     }
'   ]
' }
' 

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

' To parse the above contents of jsonPolicy...
Dim Version As String
Dim i As Integer
Dim count_i As Integer
Dim Sid As String
Dim Effect As String
Dim PrincipalAWS As String
Dim Action As String
Dim Resource As String

Version = jsonPolicy.StringOf("Version")
i = 0
count_i = jsonPolicy.SizeOfArray("Statement")
While i < count_i
    jsonPolicy.I = i
    Sid = jsonPolicy.StringOf("Statement[i].Sid")
    Effect = jsonPolicy.StringOf("Statement[i].Effect")
    PrincipalAWS = jsonPolicy.StringOf("Statement[i].Principal.AWS")
    Action = jsonPolicy.StringOf("Statement[i].Action")
    Resource = jsonPolicy.StringOf("Statement[i].Resource")
    i = i + 1
End While