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Elixir client for ElectricSQL
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lib/electric/client/authenticator/mock_authenticator.ex
defmodule Electric.Client.Authenticator.MockAuthenticator do
@moduledoc """
A pseudo-authenticating `Electric.Client.Authenticator` implementation.
This generates fake authentication headers, useful for validating that the
`Authenticator` behaviour is being called correctly.
"""
@behaviour Electric.Client.Authenticator
@joiner "\n"
@header "electric-mock-auth"
def authenticate_request(request, config) do
put_request_params(request, shape_hash(request.params, config))
end
def authenticate_shape(shape, config) do
shape
|> shape_hash(config)
|> auth_headers()
end
defp shape_hash(params, config) do
auth_hash([:table, :columns, :where], params, config)
end
defp put_request_params(request, hash) do
Map.update!(%{request | authenticated: true}, :headers, &auth_headers(&1, hash))
end
defp auth_headers(base \\ %{}, hash) do
Map.put(base, @header, hash)
end
defp auth_hash(keys, params, config) do
keys
|> Enum.map(&Map.get(params, &1, nil))
|> Enum.map(&to_string/1)
|> Enum.concat(List.wrap(config[:salt]))
|> Enum.join(@joiner)
|> then(&:crypto.hash(:sha256, &1))
|> Base.encode16(case: :lower)
end
end