Lua Requires Chilkat v11.0.0+

Generate an AWS (S3) Pre-Signed URL to Download File

See more Amazon S3 (new) Examples

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service. Lua

local chilkat = require("chilkat")

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

local http = chilkat.Http.new()

http.aws_access_key = "AWS_ACCESS_KEY"
http.aws_secret_key = "AWS_SECRET_KEY"

-- Make sure to set your AWS region correctly
http.aws_region = "us-east-1"

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

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

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

-- Generate the pre-signed URL
local preSignedUrl = http:s3_gen_presigned_url("GET", bUseHttps, bucketName, objectName, numSecondsValid, awsService)
if not http.last_method_success then
    print(http.last_error_text)
    return
end

-- The following URL can be copy-and-pasted into a browser..
print("Pre-Signed AWS S3 URL: " .. preSignedUrl)

-- 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.
local success = http:download(preSignedUrl, "c:/temp/qa_output/starfish.jpg")
if not success then
    print(http.last_error_text)
    return
end

print("Success.")