(Swift 3,4,5...) Amazon Glacier Get Vault Access Policy

Demonstrates how to retrieve the access-policy subresource set on the vault

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let rest = CkoRest()!

    // Connect to the Amazon AWS REST server in the desired region.
    var bTls: Bool = true
    var port: Int = 443
    var bAutoReconnect: Bool = true
    var success: Bool = rest.connect("glacier.us-west-2.amazonaws.com", port: port, tls: bTls, autoReconnect: bAutoReconnect)

    // Provide AWS credentials.
    let authAws = CkoAuthAws()!
    authAws.accessKey = "AWS_ACCESS_KEY"
    authAws.secretKey = "AWS_SECRET_KEY"
    authAws.serviceName = "glacier"
    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.
    // --------------------------------------------------------------------------

    // 
    // For more information, see Glacier Get Vault Access Policy Reference Documentation
    // 
    rest.addHeader("x-amz-glacier-version", value: "2012-06-01")

    // Get the access policy for the "chilkat" vault.
    let sbResponseBody = CkoStringBuilder()!
    success = rest.fullRequestNoBodySb("GET", uriPath: "/AWS_ACCOUNT_ID/vaults/chilkat/access-policy", sb: sbResponseBody)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    var respStatusCode: Int = rest.responseStatusCode.intValue
    if respStatusCode >= 400 {
        print("Response Status Code = \(respStatusCode)")
        print("Response Header:")
        print("\(rest.responseHeader!)")
        print("Response Body:")
        print("\(sbResponseBody.getAsString()!)")
        return
    }

    // Success is indicated by a 200 response status.
    print("response status code = \(respStatusCode)")

    let json = CkoJsonObject()!
    json.loadSb(sbResponseBody)
    json.emitCompact = false

    // Returns JSON such as this:
    // {
    //   "Policy": "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"Define-owner-access-rights\",\"Effect\":\"Allow\",\"Principal\":{\"AWS\":\"arn:aws:iam::9999999999999:root\"},\"Action\":\"glacier:DeleteArchive\",\"Resource\":\"arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat\"}]}"
    // }

    // Unwrap...
    let jsonPolicy = CkoJsonObject()!
    jsonPolicy.load(json.string(of: "Policy"))
    jsonPolicy.emitCompact = false

    print("\(jsonPolicy.emit()!)")
    print("----")

    // The jsonPolicy contains:

    // {
    //   "Version": "2012-10-17",
    //   "Statement": [
    //     {
    //       "Sid": "Define-owner-access-rights",
    //       "Effect": "Allow",
    //       "Principal": {
    //         "AWS": "arn:aws:iam::9999999999999:root"
    //       },
    //       "Action": "glacier:DeleteArchive",
    //       "Resource": "arn:aws:glacier:us-west-2:9999999999999:vaults/chilkat"
    //     }
    //   ]
    // }
    // 

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    // To parse the above contents of jsonPolicy...
    var Version: String?
    var i: Int
    var count_i: Int
    var Sid: String?
    var Effect: String?
    var PrincipalAWS: String?
    var Action: String?
    var Resource: String?

    Version = jsonPolicy.string(of: "Version")
    i = 0
    count_i = jsonPolicy.size(ofArray: "Statement").intValue
    while i < count_i {
        jsonPolicy.i = i
        Sid = jsonPolicy.string(of: "Statement[i].Sid")
        Effect = jsonPolicy.string(of: "Statement[i].Effect")
        PrincipalAWS = jsonPolicy.string(of: "Statement[i].Principal.AWS")
        Action = jsonPolicy.string(of: "Statement[i].Action")
        Resource = jsonPolicy.string(of: "Statement[i].Resource")
        i = i + 1
    }


}