CertCache

A certificate cache for Elixir / Pheonix.

Installation

Add cert_cache to your dependencies:

def deps do
  [{:cert_cache, "~> 0.1.0"}]
end

Then run:

$ mix deps.get

Startup

CertCache supports two methods of being started.

1. Via extra_applications in parent app's mix.exs.

   Use this method when it is sufficient to configure base_dir from config files (ie: using a value that is fixed at compile time). Ex:

   Reference CertCache in your mix.exs as usual:

   def application do
     [ extra_applications: [ :logger, :cert_cache ]
   end

   And configure base_dir in your configuration file(s):

   config :cert_cache, base_dir: "path/to/certs"

2. Via application callback.

   Use this method when base_dir must be set to a value determined at run-time (ie: when specified in an environment variable that may change between runs). Ex:

   Reference CertCache in your mix.exs via the included_applications option:

   def application do
     [
       mod: { MyApp.Application: []}
       extra_applications: [ :logger ],
       included_applications: [ :cert_cache ]
     ]
   end

   Then manually start CertCache from your app's Application start callback, passing the desired run-time detemined value for base_dir:

   defmodule MyApp.Application do
     use Application
     def start(_type, _args) do
       import Supervisor.Spec
       base_dir = System.get_env("CERT_BASE_DIR")
       children = [worker(CertCache, [{:base_dir, base_dir}])]
       {:ok, pid} = Supervisor.start_link(children, strategy: :one_for_one)
     end
   end

Note that path/to/certs is relative to the parent application's root directory.

Usage

Note:

• filename is relative to base_dir
• certs must be in PEM format

CertCache.get_cert("filename.pem")

TODO: examples for HTTPoison, hackney, etc

License

MIT