letter_opener_web

Gives letter_opener an interface for browsing sent emails.

Check out http://letter-opener-web.herokuapp.com to see it in action.

Installation

First add the gem to your development environment and run the bundle command to install it.

group :development do
  gem 'letter_opener_web', '~> 2.0'
end

Usage

Add to your routes.rb:

Your::Application.routes.draw do
  mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.configuration.delivery_method == :letter_opener_web
end

And make sure you have :letter_opener delivery method configured for your app. Then visit http://localhost:3000/letter_opener after sending an email and have fun.

If you are running the app from a Vagrant machine or Docker container, you might want to skip letter_opener's launchy calls and avoid messages like these:

12:33:42 web.1  | Failure in opening /vagrant/tmp/letter_opener/1358825621_ba83a22/rich.html
with options {}: Unable to find a browser command. If this is unexpected, Please rerun with
environment variable LAUNCHY_DEBUG=true or the '-d' commandline option and file a bug at
https://github.com/copiousfreetime/launchy/issues/new

In that case (or if you really just want to browse mails using the web interface and don't care about opening emails automatically), you can set :letter_opener_web as your delivery method on your config/environments/development.rb:

config.action_mailer.delivery_method = :letter_opener_web

If you're using :letter_opener_web as your delivery method, you can change the location of the letters by adding the following to an initializer (or in development.rb):

LetterOpenerWeb.configure do |config|
  config.letters_location = Rails.root.join('your', 'new', 'path')
end

Letter Opener Web can also be used with Amazon S3 to store letters instead of filesystem. You can change the storage type by adding the following to an initializer (or indevelopment.rb):

LetterOpenerWeb.configure do |config|
  config.letters_storage = :s3
  config.letters_location = "any/prefix/you/want"
  config.aws_access_key_id = ENV['AWS_ACCESS_KEY_ID']
  config.aws_secret_access_key = ENV['AWS_SECRET_ACCESS_KEY']
  config.aws_region = ENV['AWS_REGION']
  config.aws_bucket = ENV['AWS_BUCKET']
end

Usage on pre-production environments

Some people use this gem on staging / pre-production environments to avoid having real emails being sent out. To set that up you'll need to:

1. Move the gem out of the development group in your Gemfile
2. Set config.action_mailer.delivery_method on the appropriate config/environments/<env>.rb
3. Enable the route for the environments on your routes.rb.

In other words, your Gemfile will have:

gem 'letter_opener_web'

And your routes.rb:

Your::Application.routes.draw do
  # If you have a dedicated config/environments/staging.rb
  mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.staging?

  # If you use RAILS_ENV=production in staging environments, you'll need another
  # way to disable it in "real production"
  mount LetterOpenerWeb::Engine, at: "/letter_opener" unless ENV["PRODUCTION_FOR_REAL"]
end

You might also want to have a look at the sources for the demo available at https://github.com/fgrehm/letter_opener_web_demo.

Usage with Amazon S3 to support multiple separated instances

If you are using this gem on Heroku and your application is not using one Dyno or your have containerized setup, the default configuration won't work as the e-mail is saved on the server. You can use S3 bucket instead.

1. Configure AWS environment:

• Create new non-public bucket, note the name and the region
• Create new user using IAM or use existing one for which you already have aws_access_key_id and aws_secret_access_key
• Assign proper policy to the user. Replace your-bucket-name with the name of the bucket you have created

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "VisualEditor0",
      "Effect": "Allow",
      "Action": [
          "s3:PutObject",
          "s3:PutObjectAcl",
          "s3:GetObject",
          "s3:DeleteObject*"
      ],
      "Resource": "arn:aws:s3:::your-bucket-name/*"
    },
    {
      "Sid": "VisualEditor1",
      "Effect": "Allow",
      "Action": [
          "s3:ListBucket"
      ],
      "Resource": "arn:aws:s3:::your-bucket-name"
    }
  ]
}

2. Update gem configuration:

Add the following configuration to the initializer (or environment files):

LetterOpenerWeb.configure do |config|
  config.aws_access_key_id = ENV['AWS_ACCESS_KEY_ID']
  config.aws_secret_access_key = ENV['AWS_SECRET_ACCESS_KEY']
  config.aws_region = ENV['AWS_REGION']
  config.aws_bucket = ENV['AWS_BUCKET']
  config.letters_storage = :s3
  config.letters_location = "any prefix you want"
end

When you send e-mail with attachment(s), the presigned link is generated to attachment that is valid for 1 week.

Acknowledgements

Special thanks to @alexrothenberg for some ideas on this pull request and @pseudomuto for keeping the project alive for a few years.

Contributing

1. Fork it and run bin/setup
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request