Migrate secret key to Rails credentials file (and fix deprecation warn)

There's a bit happening behind the scenes of this change. Previously,
we kept a `SECRET_TOKEN` environment variable in `production.env`, and
used a `secret_token.rb` initializer to wire it up as the
`secret_key_base`.

In this change, we move to Rails's new-ish (two years old :p) encrypted
credentials system. Now, we set a `RAILS_MASTER_KEY` environment
variable in the deployed `production.env` instead (and in our local
`.env.production` in the project root for managing it), and we can run
`rails credentials:edit` to open the encrypted file in a text editor.

Inside, the content is just:
```yml
secret_key_base: "<OUR_SECRET_KEY>"
```

This indirection doesn't exactly do much for us functionally; it's just
the more standard way of achieving what our `secret_token.rb` situation
was achieving.

We could also migrate other secrets into there, and I just might! That
would simplify duplication between `/deploy/files/production.env` and
`/.env.production`, at any rate! The main notable one is
`MATCHU_EMAIL_PASSWORD` for sending auth emails from
`matchu@openneo.net` (and there's also a Stripe token that we don't
actually use in the app these days, those codepaths are old bones). Oh
and there's also the `IMPRESS_2020_SUPPORT_SECRET`!

Anyway, the motivation for this was to remove the warning when starting
the app that Devise is trying to use the deprecated
`Rails.application.secrets` method. I was expecting to have to do
[the workaround shared here](https://github.com/heartcombo/devise/issues/5644#issuecomment-1804626431),
but it turns out whatever default behavior Devise does under the hood
is happy enough with our new decision to use the credentials file, and
the deprecation warning is gone! Ok neat!
This commit is contained in:
Emi Matchu 2024-02-22 12:36:02 -08:00
parent 42bf4b8edb
commit 5b016673d7
2 changed files with 1 additions and 19 deletions

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# Be sure to restart your server when you modify this file.
# Your secret key is used for verifying the integrity of signed cookies.
# If you change this key, all old signed cookies will become invalid!
# Make sure the secret is at least 30 characters and all random,
# no regular words or you'll be exposed to dictionary attacks.
# You can use `rake secret` to generate a secure secret key.
# Make sure your secret_key_base is kept private
# if you're sharing your code publicly.
if Rails.env.development? || Rails.env.test?
# In development, we use a hardcoded secret key, because it doesn't actually
# need to be secret!
OpenneoImpressItems::Application.config.secret_key_base = "7584841652f89044a8b5a428efa6dfac2461449eb24741a33668cd642130d79f93b0347766ebf4a4d7d5033a263c36431594ad56b5735a7325c8cdda991219c2"
else
# In general, we use the SECRET_TOKEN provided as an environment variable!
OpenneoImpressItems::Application.config.secret_key_base = ENV.fetch('SECRET_TOKEN')
end