(Ruby) (using AWS Signature Version 2) Streaming Download to File

The main purpose of this example is to demonstrate how to use the older Signature Version 2 authentication w/ S3. It uses V2 authentication to download a file.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

rest = Chilkat::CkRest.new()

# Connect to the Amazon AWS REST server.
bTls = true
port = 443
bAutoReconnect = true
# The file is located in the bucket named "chilkat100", which becomes part of the domain:
success = rest.Connect("chilkat100.s3.amazonaws.com",port,bTls,bAutoReconnect)

# Provide AWS credentials for the REST call.
authAws = Chilkat::CkAuthAws.new()
authAws.put_AccessKey("AWS_ACCESS_KEY")
authAws.put_SecretKey("AWS_SECRET_KEY")
authAws.put_ServiceName("s3")

# For AWS Signature Version 2, the following two properties need to be set:
authAws.put_SignatureVersion(2)
# See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
authAws.put_CanonicalizedResourceV2("/chilkat100/starfish.jpg")

success = rest.SetAuthAws(authAws)

# Send the request to download the JPG.
success = rest.SendReqNoBody("GET","/starfish.jpg")
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

# Read the response header.
responseStatusCode = rest.ReadResponseHeader()
if (responseStatusCode < 0)
    print rest.lastErrorText() + "\n";
    exit
end

print "Response status code = " + responseStatusCode.to_s() + "\n";

# We expect a 200 response status if the JPG data is coming.
# Otherwise, we'll get a string response body with an error message(or no response body).
if (responseStatusCode == 200)

    bodyStream = Chilkat::CkStream.new()

    # The stream's sink will be a file.
    bodyStream.put_SinkFile("qa_output/starfish.jpg")

    # Read the response body to the stream.  Given that we've
    # set the stream's sink to a file, it will stream directly
    # to the file.
    success = rest.ReadRespBodyStream(bodyStream,true)
    if (success != true)
        print rest.lastErrorText() + "\n";
        exit
    end

    print "Successfully received the JPG file." + "\n";

else
    errResponse = rest.readRespBodyString()
    if (rest.get_LastMethodSuccess() != true)
        print rest.lastErrorText() + "\n";
    else
        print errResponse + "\n";
    end

end