Lua Requires Chilkat v9.5.0.66+

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.

Lua

local chilkat = require("chilkat")

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

local rest = chilkat.Rest.new()

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

-- Provide AWS credentials.
local authAws = chilkat.AuthAws.new()
authAws.access_key = "AWS_ACCESS_KEY"
authAws.secret_key = "AWS_SECRET_KEY"
authAws.service_name = "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:set_auth_aws(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.
local responseJsonStr = rest:full_request_no_body("GET", "/?policy")
if not rest.last_method_success then
    print(rest.last_error_text)
    return
end

-- When successful, the S3 Storage service will respond with a 200 response code,
-- with an XML body.
if rest.response_status_code ~= 200 then
    -- Examine the request/response to see what happened.
    print("response status code = " .. rest.response_status_code)
    print("response status text = " .. rest.response_status_text)
    print("response header: " .. rest.response_header)
    print("response body: " .. responseJsonStr)
    print("---")
    print("LastRequestStartLine: " .. rest.last_request_start_line)
    print("LastRequestHeader: " .. rest.last_request_header)
end

print("response body: " .. responseJsonStr)

-- Load the JSON and display in a more human-readable manner:
local json = chilkat.JsonObject.new()
json:load(responseJsonStr)
json.emit_compact = false
print(json:emit())

-- Sample output:

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