(Perl) 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 Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# 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 = chilkat::CkRest->new();

# Connect to the Amazon AWS REST server in the desired region.
$bTls = 1;
$port = 443;
$bAutoReconnect = 1;
$success = $rest->Connect("s3-us-west-2.amazonaws.com",$port,$bTls,$bAutoReconnect);

# Provide AWS credentials.
$authAws = chilkat::CkAuthAws->new();
$authAws->put_AccessKey("AWS_ACCESS_KEY");
$authAws->put_SecretKey("AWS_SECRET_KEY");
$authAws->put_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->put_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->put_Host("chilkat.ocean.s3.amazonaws.com");

# Get the policy.
$responseJsonStr = $rest->fullRequestNoBody("GET","/?policy");
if ($rest->get_LastMethodSuccess() != 1) {
    print $rest->lastErrorText() . "\r\n";
    exit;
}

# When successful, the S3 Storage service will respond with a 200 response code,
# with an XML body.  
if ($rest->get_ResponseStatusCode() != 200) {
    # Examine the request/response to see what happened.
    print "response status code = " . $rest->get_ResponseStatusCode() . "\r\n";
    print "response status text = " . $rest->responseStatusText() . "\r\n";
    print "response header: " . $rest->responseHeader() . "\r\n";
    print "response body: " . $responseJsonStr . "\r\n";
    print "---" . "\r\n";
    print "LastRequestStartLine: " . $rest->lastRequestStartLine() . "\r\n";
    print "LastRequestHeader: " . $rest->lastRequestHeader() . "\r\n";
}

print "response body: " . $responseJsonStr . "\r\n";

# Load the JSON and display in a more human-readable manner:
$json = chilkat::CkJsonObject->new();
$json->Load($responseJsonStr);
$json->put_EmitCompact(0);
print $json->emit() . "\r\n";

# Sample output:

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