Linked Data Content Negotiation for Sinatra Applications

This is a Sinatra extension that provides Linked Data content negotiation for Sinatra applications.

This version is based on [rack-linkeddata][] without the hard dependency on the [linkeddata][] gem, to allow applications to better manage their dependencies

• https://github.com/ruby-rdf/sinatra-rdf

Features

• Implements HTTP content negotiation for RDF content types using the [Rack::RDF][Rack::RDF] middleware.
• Supports all RDF.rb -compatible serialization formats.
• Supports both classic and modular Sinatra applications.

Examples

Adding Linked Data content negotiation to a classic Sinatra application

#!/usr/bin/env ruby -rubygems
require 'sinatra'
require 'sinatra/rdf'

get '/hello' do
  RDF::Graph.new do |graph|
    graph << [RDF::Node.new, RDF::DC.title, "Hello, world!"]
  end
end

Adding Linked Data content negotiation to a modular Sinatra application

#!/usr/bin/env ruby -rubygems
require 'sinatra/base'
require 'sinatra/rdf'

module My
  class Application < Sinatra::Base
    register Sinatra::RDF

    get '/hello' do
      RDF::Graph.new do |graph|
        graph << [RDF::Node.new, RDF::DC.title, "Hello, world!"]
      end
    end
  end
end

My::Application.run! :host => '127.0.0.1', :port => 4567

Adding Linked Data content negotiation to a Rackup application

#!/usr/bin/env rackup
require 'sinatra/base'
require 'sinatra/rdf'

module My
  class Application < Sinatra::Base
    register Sinatra::RDF

    get '/hello' do
      RDF::Graph.new do |graph|
        graph << [RDF::Node.new, RDF::DC.title, "Hello, world!"]
      end
    end
  end
end

run My::Application

Testing Linked Data content negotiation using rackup and curl

$ rackup doc/examples/config.ru

$ curl -iH "Accept: application/n-triples" http://localhost:9292/hello
$ curl -iH "Accept: application/turtle" http://localhost:9292/hello
$ curl -iH "Accept: application/rdf+xml" http://localhost:9292/hello
$ curl -iH "Accept: application/json" http://localhost:9292/hello
$ curl -iH "Accept: application/trix" http://localhost:9292/hello
$ curl -iH "Accept: */*" http://localhost:9292/hello

Description

Sinatra::RDF is a thin Sinatra-specific wrapper around the [Rack::RDF][Rack::RDF] middleware, which implements Linked Data content negotiation for Rack applications.

At the moment the Sinatra extension simply corresponds to doing the following manually in a Sinatra application:

require 'rack/rdf'

module My
  class Application < Sinatra::Base
    use     Rack::RDF::ContentNegotiation
    helpers Sinatra::RDF::Helpers
    include ::RDF
  end
end

See the Rack::RDF documentation for more information on the operation and details of the content negotiation.

Documentation

• Sinatra::RDF

Dependencies

• Sinatra (~> 3.1)
• Rack::RDF (~> 3.3)

Installation

The recommended installation method is via RubyGems. To install the latest official release of the gem, do:

% [sudo] gem install sinatra-rdf

Download

To get a local working copy of the development repository, do:

% git clone git://github.com/ruby-rdf/sinatra-rdf.git

Alternatively, you can download the latest development version as a tarball as follows:

% wget https://github.com/ruby-rdf/sinatra-rdf/tarball/master

References

• https://www.w3.org/DesignIssues/LinkedData.html
• https://linkeddata.org/docs/how-to-publish
• https://linkeddata.org/conneg-303-redirect-code-samples
• https://www.w3.org/TR/cooluris/
• https://www.w3.org/TR/swbp-vocab-pub/
• https://patterns.dataincubator.org/book/publishing-patterns.html

Authors

• Arto Bendiken - https://ar.to/

License

Sinatra::RDF is free and unencumbered public domain software. For more information, see https://unlicense.org/ or the accompanying UNLICENSE file.