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AEL: Simplified code for context that is responsible for Signing URL's
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defmodule Ael.Secrets.API do | |
def get_secret_url(secret) do | |
%Secret{ | |
action: action, | |
expires_at: expires_at, | |
bucket: bucket, | |
resource_id: resource_id, | |
resource_name: resource_name | |
} = secret | |
canonicalized_resource = "/#{bucket}/#{resource_id}/#{resource_name}" | |
signature = | |
action | |
|> string_to_sign(expires_at, canonicalized_resource) | |
|> sign() | |
|> Base.encode64() | |
|> URI.encode_www_form() | |
"https://storage.googleapis.com#{canonicalized_resource}" <> | |
"?GoogleAccessId=#{get_from_registry(:gcs_service_account_id)}" <> | |
"&Expires=#{expires_at}" <> | |
"&Signature=#{signature}" | |
end | |
defp string_to_sign(action, expires_at, canonicalized_resource), | |
do: Enum.join([action, "", "", expires_at, canonicalized_resource], "\n") | |
defp sign(plaintext), | |
do: :public_key.sign(plaintext, :sha256, get_from_registry(:gcs_service_account_key)) | |
defp get_from_registry(key) do | |
[{_pid, val}] = Registry.lookup(Ael.Registry, key) | |
val | |
end | |
end |
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