(Ruby) Generate an AWS (S3) Pre-Signed URL using Signature V4

Demonstrates how to generate a pre-signed URL using AWS Signature Version 4. This example generates a pre-signed URL for the Amazon S3 service.

Note: this example requires Chilkat v9.5.0.66 or greater.

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

require 'chilkat'

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

# Note: This example requires Chilkat v9.5.0.66 or greater.

http = Chilkat::CkHttp.new()

http.put_AwsAccessKey("AWS_ACCESS_KEY")
http.put_AwsSecretKey("AWS_SECRET_KEY")

# Make sure to set your AWS region correctly
http.put_AwsRegion("us-east-1")

bucketName = "chilkat100"
objectName = "starfish/starfish.jpg"
localFilePath = "qa_output/starfish.jpg"
awsService = "s3"

# The signed URL will be valid for this number of seconds:
numSecondsValid = 86400

# Choose between a URL beginning with "http://" or "https://"...
bUseHttps = false

# Generate the pre-signed URL
preSignedUrl = http.s3_GenerateUrlV4(bUseHttps,bucketName,objectName,numSecondsValid,awsService)
if (http.get_LastMethodSuccess() != true)
    print http.lastErrorText() + "\n";
    exit
end

# The following URL can be copy-and-pasted into a browser..
print "Pre-Signed AWS S3 URL: " + preSignedUrl + "\n";

# Here's an example of a pre-signed URL. 
# This URL will only work within 1 day (86400 seconds) after the time this example was published.
# 
#     http://chilkat100.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=16QXXDGY83AJJR6RVQ02%2F20170111%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170111T161959Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=72bf4fd9a15d7bbcdd313a3318d937a778905f62a3fbff9b789d8dc28acd9232

# Now try to do an HTTP Download using the signed URL.
success = http.Download(preSignedUrl,"qa_output/starfish.jpg")
if (success != true)
    print http.lastErrorText() + "\n";
else
    print "Success." + "\n";
end