Jammit S3 is a jammit wrapper that provides appropriate hooks so you can easily deploy your assets to s3/cloudfront

It's especially great for Heroku user who use generated assets such as coffee-script and sass. jammit-s3 includes a script you can use as a hook to recompile and upload all your assets.

To install jammit-s3, just use:

gem install jammit-s3

If you are using Rails3, add it to your project's Gemfile:

gem 'jammit-s3'

Jammit S3 already has a gem dependency for jammit, so I'd recommend removing any existing gem 'jammit' references from your Gemfile.

Within your config/assets.yml, just add a toplevel key called s3_bucket that contains the bucketname you want to use. If jammit-s3 doesn't find the bucket, it will try to create it. Bucketnames need to be globally unique. Learn more about bucketnames here

s3_bucket: my-awesome-jammit-bucket

To deploy your files to s3, just the jammit-s3 command at your project's root.

jammit-s3

If using it in the context of your Rails3 app, I'd recommend using bundle exec

bundle exec jammit-s3

Set your authenticaton information within config/assets.yml

s3_access_key_id: 03HDMNF59CWZ2J24T702
s3_secret_access_key: 1TzRlDmuH8DoOlJ2tlwW8qx+i+Pfe0jzIouWI2BL

Replace these with your own access keys, found here.

As you probably don't want to check this data into source control, I'd recommend you just set it to an environment variable on your local box, and use ERB

s3_access_key_id: <%= ENV['ACCESS_KEY_ID'] %>
s3_secret_access_key: <%= ENV['SECRET_ACCESS_KEY'] %>

You can then set these env variables in your .bash_profile

By default, jammit-s3 will upload your configured asset directly, along with public/images. However you can customize this using the s3_upload_files setting, which should be a list of file globs.

s3_upload_files:

• public/css/images/**

By default, jammit-s3 uses the permission setting found on the s3 bucket. However, you can override this with the config:

s3_permission: public_read

Valid permission options are:

private: Owner gets FULL_CONTROL. No one else has any access rights. This is the default.

public_read: Owner gets FULL_CONTROL and the anonymous principal is granted READ access. If this policy is used on an object, it can be read from a browser with no authentication.

public_read_write: Owner gets FULL_CONTROL, the anonymous principal is granted READ and WRITE access. This is a useful policy to apply to a bucket, if you intend for any anonymous user to PUT objects into the bucket.

authenticated_read: - Owner gets FULL_CONTROL, and any principal authenticated as a registered Amazon S3 user is granted READ access.

To use cloudfront, enable it in your config/assets.yml and set the correct CloudFront domain name:

use_cloudfront: true
cloudfront_domain: di8snu3y5lwja.cloudfront.net

This will use the CloudFront domainname for your assets instead of serving them from the (slow) S3 bucket.

For this to work you need to make sure you have the CloudFront enabled via you Amazon acccount page. Go here: http://aws.amazon.com/cloudfront/ and click "Sign Up"

To suggest a feature or report a bug: http://github.com/railsjedi/jammit-s3/issues/

Jammit S3 is a simple wrapper around Jammit. To view the original Jammit docs, use http://documentcloud.github.com/jammit/