Is it possible to set ENV variables for rails development environment in my code?

Question

I know that I can set my ENV variables in bash via

export admin_password = "secret" 

But is there a way to do it in my rails source code somewhere? My first attempt was something like this in environment/development.rb

ENV['admin_password'] = "secret" 

But it didn't work. Is there a way to do this?

Answer 1

Never hardcode sensitive information (account credentials, passwords, etc.). Instead, create a file to store that information as environment variables (key/value pairs), and exclude that file from your source code management system. For example, in terms of Git (source code management system), exclude that file by adding it to .gitignore:

-bash> echo '/config/app_environment_variables.rb' >> .gitignore  

/config/app_environment_variables.rb

ENV['HTTP_USER'] = 'devuser' ENV['HTTP_PASS'] = 'devpass' 

As well, add the following lines to /config/environment.rb, between the require line, and the Application.initialize line:

# Load the app's custom environment variables here, so that they are loaded before environments/*.rb app_environment_variables = File.join(Rails.root, 'config', 'app_environment_variables.rb') load(app_environment_variables) if File.exists?(app_environment_variables) 

That's it!

As the comment above says, by doing this you will be loading your environment variables before environments/*.rb, which means that you will be able to refer to your variables inside those files (e.g. environments/production.rb). This is a great advantage over putting your environment variables file inside /config/initializers/.

Inside app_environment_variables.rb there's no need to distinguish environments as far as development or production because you will never commit this file into your source code management system, hence it is for the development context by default. But if you need to set something special for the test environment (or for occasions when you test production mode locally), just add a conditional block below all the other variables:

if Rails.env.test?   ENV['HTTP_USER'] = 'testuser'   ENV['HTTP_PASS'] = 'testpass' end  if Rails.env.production?   ENV['HTTP_USER'] = 'produser'   ENV['HTTP_PASS'] = 'prodpass' end 

Whenever you update app_environment_variables.rb, restart the app server. Assuming you are using the likes of Apache/Passenger or rails server:

-bash> touch tmp/restart.txt 

In your code, refer to the environment variables as follows:

def authenticate   authenticate_or_request_with_http_basic do |username, password|     username == ENV['HTTP_USER'] && password == ENV['HTTP_PASS']   end end 

Note that inside app_environment_variables.rb you must specify booleans and numbers as strings (e.g. ENV['SEND_MAIL'] = 'false' not just false, and ENV['TIMEOUT'] = '30' not just 30), otherwise you will get the errors can't convert false into String and can't convert Fixnum into String, respectively.

Storing and sharing sensitive information

The final knot to tie is: how to share this sensitive information with your clients and/or partners? For the purpose of business continuity (i.e. when you get hit by a falling star, how will your clients and/or partners resume full operations of the site?), your clients and/or partners need to know all the credentials required by your app. Emailing/Skyping these things around is insecure and leads to disarray. Storing it in shared Google Docs is not bad (if everyone uses https), but an app dedicated to storing and sharing small titbits like passwords would be ideal.

How to set environment variables on Heroku

If you have a single environment on Heroku:

-bash> heroku config:add HTTP_USER='herouser' -bash> heroku config:add HTTP_USER='heropass' 

If you have multiple environments on Heroku:

-bash> heroku config:add HTTP_USER='staguser' --remote staging -bash> heroku config:add HTTP_PASS='stagpass' --remote staging  -bash> heroku config:add HTTP_USER='produser' --remote production -bash> heroku config:add HTTP_PASS='prodpass' --remote production 

Foreman and .env

Many developers use Foreman (installed with the Heroku Toolbelt) to run their apps locally (as opposed to using the likes of Apache/Passenger or rails server). Foreman and Heroku use Procfile for declaring what commands are run by your application, so the transition from local dev to Heroku is seamless in that regard. I use Foreman and Heroku in every Rails project, so this convenience is great. But here's the thing.. Foreman loads environment variables stored in /.env via dotenv but unfortunately dotenv essentially only parses the file for key=value pairs; those pairs don't become variables right there and then, so you can't refer to already set variables (to keep things DRY), nor can you do "Ruby" in there (as noted above with the conditionals), which you can do in /config/app_environment_variables.rb. For instance, in terms of keeping things DRY I sometimes do stuff like this:

ENV['SUPPORT_EMAIL']='Company Support <[email protected]>' ENV['MAILER_DEFAULT_FROM'] = ENV['SUPPORT_EMAIL'] ENV['MAILER_DEFAULT_TO']   = ENV['SUPPORT_EMAIL'] 

Hence, I use Foreman to run my apps locally, but I don't use its .env file for loading environment variables; rather I use Foreman in conjunction with the /config/app_environment_variables.rb approach described above.