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15 lines
521 B
Ruby
15 lines
521 B
Ruby
require "openssl"
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require "base64"
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key = ["943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881"].pack("H*")
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salt = ["520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5"].pack("H*")
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path = "/rs:fit:300:300/plain/http://img.example.com/pretty/image.jpg"
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digest = OpenSSL::Digest.new("sha256")
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# You can trim padding spaces to get good-looking url
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hmac = Base64.urlsafe_encode64(OpenSSL::HMAC.digest(digest, key, "#{salt}#{path}")).tr("=", "")
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signed_path = "/#{hmac}#{path}"
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puts signed_path
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