Share session between Rails and Phoenix app

config/cfg.rb

@@ -14,6 +14,8 @@ module Asciinema
     attribute :google_analytics_id,            String
     attribute :home_asciicast_id,              String
     attribute :secret_key_base,                String
+    attribute :session_encryption_salt,        String, default: 'encrypted cookie'
+    attribute :session_signing_salt,           String, default: 'signed encrypted cookie'
     attribute :admin_ids,                      Array[Integer]
     attribute :smtp_settings,                  Hash
     attribute :smtp_from_address,              String

config/config.exs

@@ -12,7 +12,7 @@ config :asciinema,
 # Configures the endpoint
 config :asciinema, Asciinema.Endpoint,
   url: [host: "localhost"],
-  secret_key_base: "cMyA6OaN0/eg6Q9+/0dzdERa3Tqp7BxP/SACWXL+XA+V5MUgf5DirQmX9mFT/iIF",
+  secret_key_base: System.get_env("SECRET_KEY_BASE") || "60BnXnzGGwwiZj91YA9XYKF9BCiM7lQ/1um8VXcWWLSdUp9OcPZV6YnQv7eFTYSY",
   render_errors: [view: Asciinema.ErrorView, accepts: ~w(html json)],
   pubsub: [name: Asciinema.PubSub,
            adapter: Phoenix.PubSub.PG2]

config/initializers/session_store.rb

@@ -1,3 +1,5 @@
 # Be sure to restart your server when you modify this file.
 
 Rails.application.config.session_store :cookie_store, key: '_asciinema_session', secure: CFG.ssl?
+Rails.application.config.action_dispatch.encrypted_cookie_salt = CFG.session_encryption_salt
+Rails.application.config.action_dispatch.encrypted_signed_cookie_salt = CFG.session_signing_salt

lib/asciinema/endpoint.ex

@@ -30,13 +30,17 @@ defmodule Asciinema.Endpoint do
   plug Plug.MethodOverride
   plug Plug.Head
 
-  # The session will be stored in the cookie and signed,
-  # this means its contents can be read but not tampered with.
-  # Set :encryption_salt if you would also like to encrypt it.
   plug Plug.Session,
-    store: :cookie,
-    key: "_asciinema_key",
-    signing_salt: "bAmOWL3A"
+    store: PlugRailsCookieSessionStore,
+    key: "_asciinema_session",
+    secure: System.get_env("SCHEME") == "https",
+    signing_salt: System.get_env("SESSION_SIGNING_SALT") || "signed encrypted cookie",
+    encrypt: true,
+    encryption_salt: System.get_env("SESSION_ENCRYPTION_SALT") || "encrypted cookie",
+    key_iterations: 1000,
+    key_length: 64,
+    key_digest: :sha,
+    serializer: Poison
 
   plug Asciinema.Router
 end

mix.exs

@@ -19,7 +19,7 @@ defmodule Asciinema.Mixfile do
   def application do
     [mod: {Asciinema, []},
      applications: [:phoenix, :phoenix_pubsub, :phoenix_html, :cowboy, :logger, :gettext,
-                    :phoenix_ecto, :postgrex]]
+                    :phoenix_ecto, :postgrex, :plug_rails_cookie_session_store]]
   end
 
   # Specifies which paths to compile per environment.
@@ -39,6 +39,8 @@ defmodule Asciinema.Mixfile do
      {:gettext, "~> 0.11"},
      {:earmark, github: "pragdave/earmark", override: true},
      {:phoenix_markdown, "~> 0.1"},
+     {:plug_rails_cookie_session_store, "~> 0.1"},
+     {:poison, "~> 2.2"},
      {:cowboy, "~> 1.0"}]
   end
 

mix.lock

@@ -15,6 +15,7 @@
   "phoenix_markdown": {:hex, :phoenix_markdown, "0.1.2", "492afec13db19a4fa77d5c10404075d71b825c3aaae87caaf5ded96d422b64fd", [:mix], [{:earmark, "~> 1.0.1", [hex: :earmark, optional: false]}, {:phoenix, "~> 1.1", [hex: :phoenix, optional: false]}, {:phoenix_html, "~> 2.3", [hex: :phoenix_html, optional: false]}]},
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "1.0.0", "c31af4be22afeeebfaf246592778c8c840e5a1ddc7ca87610c41ccfb160c2c57", [:mix], []},
   "plug": {:hex, :plug, "1.2.0", "496bef96634a49d7803ab2671482f0c5ce9ce0b7b9bc25bc0ae8e09859dd2004", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, optional: true]}, {:mime, "~> 1.0", [hex: :mime, optional: false]}]},
+  "plug_rails_cookie_session_store": {:hex, :plug_rails_cookie_session_store, "0.1.0", "8d87967eb2d4d25837e1b5778265aebf8ac797291d6ff65dbd828c4ffa7f0955", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, optional: true]}, {:plug, ">= 0.9.0", [hex: :plug, optional: false]}]},
   "poison": {:hex, :poison, "2.2.0", "4763b69a8a77bd77d26f477d196428b741261a761257ff1cf92753a0d4d24a63", [:mix], []},
   "poolboy": {:hex, :poolboy, "1.5.1", "6b46163901cfd0a1b43d692657ed9d7e599853b3b21b95ae5ae0a777cf9b6ca8", [:rebar], []},
   "postgrex": {:hex, :postgrex, "0.11.2", "139755c1359d3c5c6d6e8b1ea72556d39e2746f61c6ddfb442813c91f53487e8", [:mix], [{:connection, "~> 1.0", [hex: :connection, optional: false]}, {:db_connection, "~> 1.0-rc", [hex: :db_connection, optional: false]}, {:decimal, "~> 1.0", [hex: :decimal, optional: false]}]},