ivobenedito / imgix-rb

Ruby Gem for signing imgix URLs.

Imgix

Official Ruby Gem for signing imgix URLs. Tested under 1.9.2, 2.2.2, JRuby 1.7.19, and Rubinius 2.2.7.

Installation

Add this line to your application's Gemfile:

gem 'imgix'

And then execute:

$ bundle

Or install it yourself as:

$ gem install imgix

Usage

Simply initialize a client with a :host or :hosts and your :secure_url_token. By default, HTTPS URLs are generated, but you can toggle that by passing use_https: false.

Call Imgix::Client#path with the resource path to get an Imgix::Path object back. You can then manipulate the path parameters, and call Imgix#Path#to_url when you're done.

client = Imgix::Client.new(host: 'your-subdomain.imgix.net', secure_url_token: 'your-token')

client.path('/images/demo.png').to_url(w: 200)
#=> https://your-subdomain.imgix.net/images/demo.png?w=200&s=2eadddacaa9bba4b88900d245f03f51e

# OR
path = client.path('/images/demo.png')
path.width = 200
path.to_url

# OR
client.path('/images/demo.png').width(200).height(300).to_url

# Some other tricks
path.defaults.width(300).to_url # Resets parameters
path.rect(x: 0, y: 50, width: 200, height: 300).to_url # Rect helper

Domain Sharded URLs

Domain sharding enables you to spread image requests across multiple domains. This allows you to bypass the requests-per-host limits of browsers. We recommend 2-3 domain shards maximum if you are going to use domain sharding.

In order to use domain sharding, you need to add multiple domains to your source. You then provide a list of these domains to a builder.

client = Imgix::Client.new(hosts: ['your-subdomain-1.imgix.net',
  'your-subdomain-2.imgix.net'])

By default, shards are calculated using a checksum so that the image path always resolves to the same domain. This improves caching in the browser. However, you can also specify cycle that simply cycles through the domains as you request them.

client = Imgix::Client.new(hosts: ['your-subdomain-1.imgix.net',
  'your-subdomain-2.imgix.net'], shard_strategy: :cycle))

Multiple Parameters

When the imgix api requires multiple parameters you have to use the method rather than an accessor.

For example to use the noise reduction options:

path.noise_reduction(50,50)

URL encoding and signed ImgIX URLs

Some important third parties (like Facebook) apply URL escaping to query string components, which can cause correctly signed ImgIX URLs to to be transformed into incorrectly signed ones. We URL encode the query part of the URL before signing, so you don't have to worry about this.

What is the ixlib param on every request?

For security and diagnostic purposes, we sign all requests with the language and version of library used to generate the URL.

This can be disabled by including include_library_param: false in the instantiation Hash parameter for Imgix::Client:

client = Imgix::Client.new({ include_library_param: false })

Contributing

See the contributing guide.