Java

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.

Chilkat2 Java

import com.chilkatsoft.chilkat2.AuthAws;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 rest = new Rest();

        // Connect to the Amazon AWS REST server in the desired region.
        boolean bTls = true;
        int port = 443;
        boolean bAutoReconnect = true;
        rest.connect("s3-us-west-2.amazonaws.com", port, bTls, bAutoReconnect);

        // Provide AWS credentials.
        AuthAws authAws = new AuthAws();
        authAws.setAccessKey("AWS_ACCESS_KEY");
        authAws.setSecretKey("AWS_SECRET_KEY");
        authAws.setServiceName("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.setRegion("us-west-2");

        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.setHost("chilkat.ocean.s3.amazonaws.com");

        // Get the policy.
        String responseJsonStr;
        try {
            responseJsonStr = rest.fullRequestNoBody("GET", "/?policy");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // When successful, the S3 Storage service will respond with a 200 response code,
        // with an XML body.
        if (rest.getResponseStatusCode() != 200) {
            // Examine the request/response to see what happened.
            System.out.println("response status code = " + rest.getResponseStatusCode());
            System.out.println("response status text = " + rest.getResponseStatusText());
            System.out.println("response header: " + rest.getResponseHeader());
            System.out.println("response body: " + responseJsonStr);
            System.out.println("---");
            System.out.println("LastRequestStartLine: " + rest.getLastRequestStartLine());
            System.out.println("LastRequestHeader: " + rest.getLastRequestHeader());
        }

        System.out.println("response body: " + responseJsonStr);

        // Load the JSON and display in a more human-readable manner:
        JsonObject json = new JsonObject();
        json.load(responseJsonStr);
        json.setEmitCompact(false);
        System.out.println(json.emit());

        // Sample output:

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