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goth
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A simple library to generate and retrieve Oauth2 tokens for use with Google Cloud Service accounts.
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lib/goth/http_client.ex
defmodule Goth.HTTPClient do
@moduledoc false
@type method() :: atom()
@type url() :: binary()
@type status() :: non_neg_integer()
@type header() :: {binary(), binary()}
@type body() :: binary()
@type initial_state() :: map()
@doc """
Callback to initialize the given HTTP client.
The returned `initial_state` needs to be a map and will be given to `c:request/6`.
"""
@callback init(opts :: keyword()) :: initial_state()
@doc """
Callback to make an HTTP request.
"""
@callback request(method(), url(), [header()], body(), opts :: keyword(), initial_state()) ::
{:ok, %{status: status, headers: [header()], body: body()}}
| {:error, Exception.t()}
@doc false
def init({module, opts}) when is_atom(module) and is_list(opts) do
initial_state = module.init(opts)
unless is_map(initial_state) do
raise "#{inspect(module)}.init/1 must return a map, got: #{inspect(initial_state)}"
end
{module, initial_state}
end
@doc false
def request({module, initial_state}, method, url, headers, body, opts) do
module.request(method, url, headers, body, opts, initial_state)
end
end