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cca6bdaf06
Base.decode16!/2 only accepts uppercase strings as default so the elixir example does not work out of the box.
38 lines
1.0 KiB
Elixir
38 lines
1.0 KiB
Elixir
defmodule App.Imgproxy do
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@prefix "https://imgproxy.mybiz.xyz"
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@key Base.decode16!("943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881", case: :lower)
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@salt Base.decode16!("520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5", case: :lower)
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def build_url(img_url, opts) do
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path = build_path(img_url, opts)
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signature = gen_signature(path)
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Path.join([@prefix, signature, path])
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end
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defp build_path(img_url, opts) do
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Path.join([
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"/",
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opts.resize,
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to_string(opts.width),
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to_string(opts.height),
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opts.gravity,
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to_string(opts.enlarge),
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Base.url_encode64(img_url, padding: false) <> "." <> opts.extension
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])
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end
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defp gen_signature(path) do
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:sha256
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|> :crypto.hmac(@key, @salt <> path)
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|> Base.url_encode64(padding: false)
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end
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end
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# Usage
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#
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# App.Imgproxy.build_url(
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# "https://myawesomedomain.com/raw-image.png",
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# %{resize: "fit", width: 1000, height: 400, gravity: "ce", enlarge: 0, extension: "jpg"}
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# )
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