class Github::Repos::Collaborators

def add(user_name, repo_name, collaborator, params={})
  _update_user_repo_params(user_name, repo_name)
  _validate_user_repo_params(user, repo) unless user? && repo?
  _validate_presence_of collaborator
  normalize! params
  put_request("/repos/#{user}/#{repo}/collaborators/#{collaborator}", params)
end

def collaborator?(user_name, repo_name, collaborator, params={})
  _update_user_repo_params(user_name, repo_name)
  _validate_user_repo_params(user, repo) unless user? && repo?
  _validate_presence_of collaborator
  normalize! params
  get_request("/repos/#{user}/#{repo}/collaborators/#{collaborator}", params)
  true
rescue Github::Error::NotFound
  false
end

def list(user_name, repo_name, params={})
  _update_user_repo_params(user_name, repo_name)
  _validate_user_repo_params(user, repo) unless (user? && repo?)
  normalize! params
  response = get_request("/repos/#{user}/#{repo}/collaborators", params)
  return response unless block_given?
  response.each { |el| yield el }
end

def remove(user_name, repo_name, collaborator, params={})
  _update_user_repo_params(user_name, repo_name)
  _validate_user_repo_params(user, repo) unless user? && repo?
  _validate_presence_of collaborator
  normalize! params
  delete_request("/repos/#{user}/#{repo}/collaborators/#{collaborator}", params)
end