(Objective-C) S3 List Buckets using an STS Session Token

This is an example showing how to use an STS session token in an Amazon AWS request. This example will list S3 buckets using a previously obtained session token.

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#import <CkoXml.h>
#import <CkoRest.h>
#import <CkoAuthAws.h>
#import <CkoStringBuilder.h>

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

// See Get AWS STS Session Token for sample code to get the session token XML.
CkoXml *xmlToken = [[CkoXml alloc] init];
BOOL success = [xmlToken LoadXmlFile: @"qa_data/tokens/aws_session_token.xml"];
if (success == NO) {
    NSLog(@"%@",xmlToken.LastErrorText);
    return;
}

CkoRest *rest = [[CkoRest alloc] init];

// Connect to the Amazon AWS REST server.
BOOL bTls = YES;
int port = 443;
BOOL bAutoReconnect = YES;
success = [rest Connect: @"s3.amazonaws.com" port: [NSNumber numberWithInt: port] tls: bTls autoReconnect: bAutoReconnect];

// Provide AWS credentials for the REST call.
CkoAuthAws *authAws = [[CkoAuthAws alloc] init];

// The purpose of this example is to show how to use the temporary AccessKeyId, SecretAccessKey, and SessionToken.
authAws.AccessKey = [xmlToken GetChildContent: @"GetSessionTokenResult|Credentials|AccessKeyId"];
authAws.SecretKey = [xmlToken GetChildContent: @"GetSessionTokenResult|Credentials|SecretAccessKey"];
authAws.ServiceName = @"s3";
success = [rest SetAuthAws: authAws];

[rest AddQueryParam: @"X-Amz-Security-Token" value: [xmlToken GetChildContent: @"GetSessionTokenResult|Credentials|SessionToken"]];

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];
success = [rest FullRequestNoBodySb: @"GET" uriPath: @"/" sb: sbResponse];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

int statusCode = [rest.ResponseStatusCode intValue];
NSLog(@"%@%d",@"Response status code = ",statusCode);

CkoXml *xml = [[CkoXml alloc] init];
[xml LoadSb: sbResponse autoTrim: YES];
NSLog(@"%@",[xml GetXml]);

if (statusCode != 200) {
    NSLog(@"%@",@"Failed.  See error information in the XML.");
    return;
}