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- require "openssl"
- require "base64"
- key = ["943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881"].pack("H*")
- salt = ["520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5"].pack("H*")
- url = "http://img.example.com/pretty/image.jpg"
- # You can trim padding spaces to get good-looking url
- encoded_url = Base64.urlsafe_encode64(url).tr("=", "").scan(/.{1,16}/).join("/")
- resize = "fill"
- width = 300
- height = 300
- gravity = "no"
- enlarge = 1
- extension = "png"
- path = "/rs:#{resize}:#{width}:#{height}:#{enlarge}/g:#{gravity}/#{encoded_url}.#{extension}"
- digest = OpenSSL::Digest.new("sha256")
- # You can trim padding spaces to get good-looking url
- hmac = Base64.urlsafe_encode64(OpenSSL::HMAC.digest(digest, key, "#{salt}#{path}")).tr("=", "")
- signed_path = "/#{hmac}#{path}"
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