search_oss_rails.rb

require 'uri'
require 'net/http'
require 'json'
require 'ostruct'
require 'link_header' # Please execute 'gem install link_header'

class ApiClient
  def initialize(access_token)
    @access_token = access_token
  end
  
  def get(url)
    url = URI.parse(url)
    req = Net::HTTP::Get.new(url)
    req.add_field("Authorization", "token #{@access_token}")
    
    Net::HTTP.new(url.host, url.port).tap { |http| http.use_ssl = true}.start do |http|
      http.request(req)
    end
  end
end
api_client = ApiClient.new(ENV['GITHUB_API_ACCESS_TOKEN'])

# Search github repositories which uses Ruby and has over 1000 stars. 
API_URL = 'https://api.github.com/search/repositories?q=language:ruby%20stars:%3E3000&sort=star&order=desc'

repositories = Enumerator.new do |y|
  repos = []
  next_url = API_URL
  
  loop do
    if repos.empty?
      break if next_url.nil?
      
      response = api_client.get(next_url)
      repos = JSON.parse(response.body)['items'].map { |item| OpenStruct.new(item) }
      next_url = LinkHeader.parse(response['Link']).to_a.detect { |_, attrs| Hash[attrs]['rel'] == 'next' }&.first
    end

    y << repos.shift
  end
end

LIMIT = 10
rails_using_repositories = []
repositories.each do |repo|
  gemfile_url = repo.contents_url.sub('{+path}', 'Gemfile')
  response = api_client.get(gemfile_url)
  next unless response.is_a?(Net::HTTPSuccess)

  gemfile_download_url = JSON.parse(response.body)['download_url']
  gemfile = api_client.get(gemfile_download_url).body
  next unless /gem\s+('rails'|"rails")/.match?(gemfile)
  
  puts repo.name
  rails_using_repositories << repo
  break if rails_using_repositories.length >= LIMIT
end

p rails_using_repositories.map(&:name)