(Objective-C) S3 Upload String using AWS Signature Version 2

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2.

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#import <CkoRest.h>
#import <CkoAuthAws.h>
#import <CkoFileAccess.h>
#import <NSString.h>

// Demonstrates how to use older AWS S3 Signature Version 2 for uploading the contents
// of a string variable to an object in a bucket.

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

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

// Connect to the Amazon AWS REST server.
BOOL bTls = YES;
int port = 443;
BOOL bAutoReconnect = YES;
// The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
BOOL success = [rest Connect: @"chilkat100.s3.amazonaws.com" port: [NSNumber numberWithInt: port] tls: bTls autoReconnect: bAutoReconnect];

// ----------------------------------------------------------------------------
// Important: For buckets created in regions outside us-east-1,
// there are three important changes that need to be made.
// See Working with S3 Buckets in Non-us-east-1 Regions for the details.
// ----------------------------------------------------------------------------

// Provide AWS credentials for the REST call.
CkoAuthAws *authAws = [[CkoAuthAws alloc] init];
authAws.AccessKey = @"AWS_ACCESS_KEY";
authAws.SecretKey = @"AWS_SECRET_KEY";
authAws.ServiceName = @"s3";

// For AWS Signature Version 2, the following two properties need to be set:
authAws.SignatureVersion = [NSNumber numberWithInt:2];
// See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
// The bucket is "chilkat100", and the uriPath is "/hamlet_play.xml", which must match
// the URI path passed to the FullRequestString method below.
authAws.CanonicalizedResourceV2 = @"/chilkat100/hamlet_play.xml";

success = [rest SetAuthAws: authAws];

// Load a text file into memory.
CkoFileAccess *fac = [[CkoFileAccess alloc] init];
NSString *fileContents = [fac ReadEntireTextFile: @"qa_data/xml/hamlet.xml" charset: @"utf-8"];
if (fac.LastMethodSuccess != YES) {
    NSLog(@"%@",fac.LastErrorText);
    return;
}

// To send the file in gzip or deflate compressed format, set the Content-Encoding request
// header to "gzip" or "deflate".  (this is optional)
success = [rest AddHeader: @"Content-Encoding" value: @"gzip"];

// Indicate the Content-Type of our upload.  (This is optional)
success = [rest AddHeader: @"Content-Type" value: @"text/xml"];

// We can add an "Expect: 100-continue" header so that if the request is rejected
// by the server immediately after receiving the request header, it can respond
// and the client (Chilkat) can avoid sending the file data.
// (this is optional)
success = [rest AddHeader: @"Expect" value: @"100-continue"];

// Upload the file to Amazon S3.
NSString *responseBodyStr = [rest FullRequestString: @"PUT" uriPath: @"/hamlet_play.xml" bodyText: fileContents];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// Did we get a 200 response indicating success?
int statusCode = [rest.ResponseStatusCode intValue];
if (statusCode != 200) {
    NSLog(@"%@%@",@"Error response: ",responseBodyStr);
    NSLog(@"%@%d%@%@",@"Status code: ",statusCode,@", Status text: ",rest.ResponseStatusText);
    return;
}

NSLog(@"%@",@"File successfully uploaded.");