Crepe is a lightweight API framework designed to help you write clean, fast web services in Ruby. With an elegant and intuitive DSL inspired by RSpec, and with a nod to Grape, Crepe makes API design simple.
In your application's Gemfile:
gem 'crepe', github: 'crepe/crepe'If you're coming from Rails and/or you want a Crepe application with a thought-out file structure, you can use creperie to generate a new API:
$ gem install creperie --pre
$ crepe new my_apiCrepe APIs are, at their core, Rack applications. They can be created by
subclassing Crepe::API. To detail Crepe's major features, we'll show how
GitHub's Gist API could be written using Crepe:
# config.ru
require 'bundler/setup'
require 'crepe'
module Gist
class API < Crepe::API
# Like `let` in RSpec, this defines a lazy-loading helper.
let(:current_user) { User.authorize!(request.headers['Authorization']) }
namespace :gists do
let(:gist_params) { params.slice(:files, :description, :public) }
get do
begin
current_user.gists.limit(30)
rescue User::Unauthorized
Gist.limit(30)
end
end
post { Gist.create(gist_params) }
get(:public) { Gist.limit(30) }
get(:starred) { current_user.starred_gists }
# Specify a parameter as part of the namespace: /gists/:id/...
param :id do
let(:gist) { Gist.find(params[:id]) }
get { gist }
put { gist.update_attributes(gist_params) }
patch { gist.update_attributes(gist_params) }
delete do
if gist.user == current_user
gist.destroy and head :no_content
else
error! :unauthorized
end
end
# Specify a parameter constraint, e.g. a 40-character hex string
param(sha: /\h{40}/) { gist.revisions.find(params[:sha]) }
get(:commits) { gist.commits.limit(30) }
get :star do
if current_user.starred?(gist)
head :no_content
else
head :not_found
end
end
put(:star) { current_user.star(gist) }
delete(:star) { current_user.unstar(gist) }
get(:forks) { gist.forks.limit(30) }
post(:forks) { current_user.fork(gist) }
end
end
rescue_from ActiveRecord::RecordNotFound do |e|
error! :not_found, e.message
end
rescue_from ActiveRecord::InvalidRecord do |e|
error! :unprocessable_entity, e.message, errors: e.record.errors
end
rescue_from User::Unauthorized do |e|
unauthorized! realm: 'Gist API'
end
end
end
run Gist::APIThe above example will give you a Rack application that you can run with the
rackup command, responding to the following routes:
GET /gists
POST /gists
GET /gists/public
GET /gists/starred
GET /gists/:id
PUT /gists/:id
PATCH /gists/:id
DELETE /gists/:id
GET /gists/:id/:sha
GET /gists/:id/commits
GET /gists/:id/star
PUT /gists/:id/star
DELETE /gists/:id/star
GET /gists/:id/forks
POST /gists/:id/forks
The above example only skims the surface of what Crepe can do. For more information, see the Crepe wiki.
(The MIT License.)
© 2013â2015 Stephen Celis [email protected], Evan Owen [email protected], David Celis [email protected]
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the âSoftwareâ), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED âAS ISâ, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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