Visual FoxPro

S3 Get Bucket Policy

See more Amazon S3 (new) Examples

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loAuthAws
LOCAL lcResponseJsonStr
LOCAL loJson

lnSuccess = 0

*  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.

loRest = CreateObject('Chilkat.Rest')

*  Connect to the Amazon AWS REST server in the desired region.
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("s3-us-west-2.amazonaws.com",lnPort,lnBTls,lnBAutoReconnect)

*  Provide AWS credentials.
loAuthAws = CreateObject('Chilkat.AuthAws')
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.SecretKey = "AWS_SECRET_KEY"
loAuthAws.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".
loAuthAws.Region = "us-west-2"

lnSuccess = loRest.SetAuthAws(loAuthAws)

*  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"
loRest.Host = "chilkat.ocean.s3.amazonaws.com"

*  Get the policy.
lcResponseJsonStr = loRest.FullRequestNoBody("GET","/?policy")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loAuthAws
    CANCEL
ENDIF

*  When successful, the S3 Storage service will respond with a 200 response code,
*  with an XML body.  
IF (loRest.ResponseStatusCode <> 200) THEN
    *  Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body: " + lcResponseJsonStr
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
ENDIF

? "response body: " + lcResponseJsonStr

*  Load the JSON and display in a more human-readable manner:
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(lcResponseJsonStr)
loJson.EmitCompact = 0
? loJson.Emit()

*  Sample output:

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

RELEASE loRest
RELEASE loAuthAws
RELEASE loJson