(PowerShell) 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.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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.

$rest = New-Object Chilkat.Rest

# Connect to the Amazon AWS REST server in the desired region.
$bTls = $true
$port = 443
$bAutoReconnect = $true
$success = $rest.Connect("s3-us-west-2.amazonaws.com",$port,$bTls,$bAutoReconnect)

# Provide AWS credentials.
$authAws = New-Object 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.
$responseJsonStr = $rest.FullRequestNoBody("GET","/?policy")
if ($rest.LastMethodSuccess -ne $true) {
    $($rest.LastErrorText)
    exit
}

# When successful, the S3 Storage service will respond with a 200 response code,
# with an XML body.  
if ($rest.ResponseStatusCode -ne 200) {
    # Examine the request/response to see what happened.
    $("response status code = " + $rest.ResponseStatusCode)
    $("response status text = " + $rest.ResponseStatusText)
    $("response header: " + $rest.ResponseHeader)
    $("response body: " + $responseJsonStr)
    $("---")
    $("LastRequestStartLine: " + $rest.LastRequestStartLine)
    $("LastRequestHeader: " + $rest.LastRequestHeader)
}

$("response body: " + $responseJsonStr)

# Load the JSON and display in a more human-readable manner:
$json = New-Object Chilkat.JsonObject
$json.Load($responseJsonStr)
$json.EmitCompact = $false
$($json.Emit())

# Sample output:

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