module FeedBurner

# File lib/feed_burner.rb, line 12
def feed(params, timeout = 10)
  validate_params!(params)
  response = Timeout::timeout(timeout) do
    ::Faraday.get(request_uri(params))
  end
  JSON.parse(response.body)
end

# File lib/feed_burner.rb, line 39
def encrypted_token(uri)
  OpenSSL::HMAC.hexdigest(OpenSSL::Digest::Digest.new('sha1'), api_key.to_s, uri)
end

# File lib/feed_burner.rb, line 28
def request_uri(params)
  uri = "http://localhost:3000/api/v1/feeds/#{params[:trip_id]}?"
  uri << "username=#{params[:username]}"
  uri << "&timestamp=#{Time.now.to_i}"
  uri << "&text_only=#{params[:text_only]}" if params[:text_only]

  signature = encrypted_token(uri)

  uri << "&signature=#{signature}"
end

# File lib/feed_burner.rb, line 22
def validate_params!(params)
  unless params[:trip_id].is_a?(String) && params[:username].is_a?(String)
    raise ArgumentError, "Invalid arguments specified: #{params}. Coordinator and Trip are required."
  end
end