Asana

A Ruby client for the 1.0 version of the Asana API.

Supported rubies:

• MRI 2.0.0 up to 2.2.x stable

Installation

Add this line to your application's Gemfile:

gem 'asana'

And then execute:

$ bundle

Or install it yourself as:

$ gem install asana

Usage

To do anything, you'll need always an instance of Asana::Client configured with your preferred authentication method (see the Authentication section below for more complex scenarios) and other options.

The most minimal example would be as follows:

require 'asana'

client = Asana::Client.new do |c|
  c.authentication :api_token, 'my_api_token'
end

client.workspaces.find_all.first

A full-blown customized client using OAuth2 wih a previously obtained refresh token, Typhoeus as a Faraday adapter, a custom user agent and custom Faraday middleware:

require 'asana'

client = Asana::Client.new do |c|
  c.authentication :oauth2,
                   refresh_token: 'abc',
                   client_id: 'bcd',
                   client_secret: 'cde',
                   redirect_uri: 'http://example.org/auth'
  c.faraday_adapter :typhoeus
  c.configure_faraday { |conn| conn.use SomeFaradayMiddleware }
end

workspace = client.workspaces.find_by_id(12)
workspace.users
# => #<Asana::Collection<User> ...>
client.tags.create_in_workspace(workspace: workspace.id, name: 'foo')
# => #<Asana::Tag id: ..., name: "foo">

All resources are exposed as methods on the Asana::Client instance. Check out the documentation for each of them.

Authentication

This gem supports authenticating against the Asana API with either an API token or through OAuth2.

API Token

Asana::Client.new do |c|
  c.authentication :api_token, 'my_api_token'
end

OAuth2

Authenticating through OAuth2 is preferred. There are many ways you can do this.

With a plain bearer token (doesn't support auto-refresh)

If you have a plain bearer token obtained somewhere else and you don't mind not having your token auto-refresh, you can authenticate with it as follows:

Asana::Client.new do |c|
  c.authentication :oauth2, bearer_token: 'my_bearer_token'
end

With a refresh token and client credentials

If you obtained a refresh token, you can use it together with your client credentials to authenticate:

Asana::Client.new do |c|
  c.authentication :oauth2,
                   refresh_token: 'abc',
                   client_id: 'bcd',
                   client_secret: 'cde',
                   redirect_uri: 'http://example.org/auth'
end

With an ::OAuth2::AccessToken object (from omniauth-asana for example)

If you use omniauth-asana or a browser-based OAuth2 authentication strategy in general, possibly because your application is a web application, you can reuse those credentials to authenticate with this API client. Here's how to do it from the callback method:

# assuming we're using Sinatra and omniauth-asana
get '/auth/:name/callback' do
  creds = request.env["omniauth.auth"]["credentials"].tap { |h| h.delete('expires') }
  strategy = request.env["omniauth.strategy"]

  # We need to refresh the omniauth OAuth2 token
  access_token = OAuth2::AccessToken.from_hash(strategy.client, creds).refresh!

  $client = Asana::Client.new do |c|
    c.authentication :oauth2, access_token
  end
 
  redirect '/'
end

See examples/omniauth_integration.rb for a working example of this.

Using an OAuth2 offline authentication flow (for CLI applications)

If your application can't receive HTTP requests and thus you can't use omniauth-asana, for example if it's a CLI application, you can authenticate as follows:

access_token = Asana::Authentication::OAuth2.offline_flow(client_id: ...,
                                                          client_secret: ...)
client = Asana::Client.new do |c|
  c.authentication :oauth2, access_token
end

client.tasks.find_by_id(12)

This will print an authorization URL on STDOUT, and block until you paste in the authorization code, which you can get by visiting that URL and granting the necessary permissions.

Pagination

Whenever you ask for a collection of resources, you can provide a number of results per page to fetch, between 1 and 100. If you don't provide any, it defaults to 20.

my_tasks = client.tasks.find_by_tag(tag: tag_id, per_page: 5)
# => #<Asana::Collection<Task> ...>

An Asana::Collection is a paginated collection -- it holds the first per_page results, and a reference to the next page if any.

When you iterate an Asana::Collection, it'll transparently keep fetching all the pages, and caching them along the way:

my_tasks.size # => 23, not 5
my_tasks.take(14)
# => [#<Asana::Task ...>, #<Asana::Task ...>, ... until 14]

Manual pagination

If you only want to deal with one page at a time and manually paginate, you can get the elements of the current page with #elements and ask for the next page with #next_page, which will return an Asana::Collection with the next page of elements:

my_tasks.elements # => [#<Asana::Task ...>, #<Asana::Task ...>, ... until 5]
my_tasks.next_page # => #<Asana::Collection ...>

Lazy pagination

Because an Asana::Collection represents the entire collection, it is often handy to just take what you need from it, rather than let it fetch all its contents from the network. You can accomplish this by turning it into a lazy collection with #lazy:

# let my_tasks be an Asana::Collection of 10 pages of 100 elements each
my_tasks.lazy.drop(120).take(15).to_a
# Fetches only 2 pages, enough to get elements 120 to 135
# => [#<Asana::Task ...>, #<Asana::Task ...>, ...]

Error handling

In any request against the Asana API, there a number of errors that could arise. Those are well documented in the Asana API Documentation, and are represented as exceptions under the namespace Asana::Errors.

All errors are subclasses of Asana::Errors::APIError, so make sure to rescue instances of this class if you want to handle them yourself.

I/O options

All requests (except DELETE) accept extra I/O options as documented in the API docs. Just pass an extra options hash to any request:

client.tasks.find_by_id(12, options: { expand: ['workspace'] })

Attachment uploading

To attach a file to a task or a project, you just need its absolute path on your filesystem and its MIME type, and the file will be uploaded for you:

task = client.tasks.find_by_id(12)
attachment = task.attach(filename: '/absolute/path/to/my/file.png',
                         mime: 'image/png')
attachment.name # => 'file.png'

Event streams

To subscribe to an event stream of a task or a project, just call #events on it:

task = client.tasks.find_by_id(12)
task.events # => #<Asana::Events ...>

# You can do the same with only the task id:
events = client.events.for(task.id)

An Asana::Events object is an infinite collection of Asana::Event instances. Be warned that if you call #each on it, it will block forever!

Note that, by default, an event stream will wait at least 1 second between polls, but that's configurable with the wait parameter:

# wait at least 3 and a half seconds between each poll to the API
task.events(wait: 3.5) # => #<Asana::Events ...>

There are some interesting things you can do with an event stream, as it is a normal Ruby Enumerable. Read below to get some ideas.

Subscribe to the event stream with a callback, polling every 2 seconds

# Run this in another thread so that we don't block forever
events = client.tasks.find_by_id(12).events(wait: 2)
Thread.new do
  events.each do |event|
    notify_someone "New event arrived! #{event}"
  end
end

Make the stream lazy and filter it by a specific pattern

To do that we need to call #lazy on the Events instance, just like with any other Enumerable.

events = client.tasks.find_by_id(12).events
only_change_events = events.lazy.select { |event| event.action == 'changed' }
Thread.new do
  only_change_events.each do |event|
    notify_someone "New change event arrived! #{event}"
  end
end

Development

You'll need Ruby 2.1+ and Node v0.10.26+ / NPM 1.4.3+ installed.

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

Run the build with rake. This is equivalent to:

$ rake spec && rake rubocop && rake yard

To install this gem onto your local machine, run bundle exec rake install.

Releasing a new version

To release a new version, run either of these commands:

rake bump:patch
rake bump:minor
rake bump:major

This will: update lib/asana/version.rb, commit and tag the commit. Then you just need to push --tags to let Travis build and release the new version to Rubygems:

git push --tags

Code generation

The specific Asana resource classes (Tag, Workspace, Task, etc) are generated code, hence they shouldn't be modified by hand. The code that generates it lives in lib/templates/resource.ejs, and is tested by generating spec/templates/unicorn.rb and running spec/templates/unicorn_spec.rb as part of the build.

If you wish to make changes on the code generation script:

1. Add/modify a spec on spec/templates/unicorn_spec.rb
2. Add your new feature or change to lib/templates/resource.ejs
3. Run rake or, more granularly, rake codegen && rspec spec/templates/unicorn_spec.rb

Once you're sure your code works, submit a pull request and ask the maintainer to make a release, as they'll need to run a release script from the asana-api-meta repository.

Contributing

1. Fork it ( https://github.com/[my-github-username]/asana/fork )
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 a new Pull Request