module Airbrake
  # Sends out the notice to Airbrake
  class Sender

    NOTICES_URI = '/notifier_api/v2/notices/'.freeze
    HTTP_ERRORS = [Timeout::Error,
                   Errno::EINVAL,
                   Errno::ECONNRESET,
                   EOFError,
                   Net::HTTPBadResponse,
                   Net::HTTPHeaderSyntaxError,
                   Net::ProtocolError,
                   Errno::ECONNREFUSED].freeze

    def initialize(options = {})
      [ :proxy_host,
        :proxy_port, 
        :proxy_user, 
        :proxy_pass, 
        :protocol,
        :host, 
        :port, 
        :secure, 
        :use_system_ssl_cert_chain, 
        :http_open_timeout, 
        :http_read_timeout
      ].each do |option|
        instance_variable_set("@#{option}", options[option])
      end
    end

    # Sends the notice data off to Airbrake for processing.
    #
    # @param [String] data The XML notice to be sent off
    def send_to_airbrake(data)
      http = setup_http_connection

      response = begin
                   http.post(url.path, data, HEADERS)
                 rescue *HTTP_ERRORS => e
                   log :error, "Timeout while contacting the Airbrake server."
                   nil
                 end

      case response
      when Net::HTTPSuccess then
        log :info, "Success: #{response.class}", response
      else
        log :error, "Failure: #{response.class}", response
      end

      if response && response.respond_to?(:body)
        error_id = response.body.match(%r{<error-id[^>]*>(.*?)</error-id>})
        error_id[1] if error_id
      end
    rescue => e
      log :error, "[Airbrake::Sender#send_to_airbrake] Cannot send notification. Error: #{e.class} - #{e.message}\nBacktrace:\n#{e.backtrace.join("\n\t")}"
      nil
    end


    # Local certificate path.
    #
    def self.local_cert_path
      File.expand_path(File.join("..", "..", "..", "resources", "ca-bundle.crt"), __FILE__)
    end

    attr_reader :proxy_host,
                :proxy_port,
                :proxy_user,
                :proxy_pass,
                :protocol,
                :host,
                :port,
                :secure,
                :use_system_ssl_cert_chain,
                :http_open_timeout,
                :http_read_timeout

    alias_method :secure?, :secure
    alias_method :use_system_ssl_cert_chain?, :use_system_ssl_cert_chain
    
  private

    def url
      URI.parse("#{protocol}://#{host}:#{port}").merge(NOTICES_URI)
    end

    def log(level, message, response = nil)
      logger.send level, LOG_PREFIX + message if logger
      Airbrake.report_environment_info
      Airbrake.report_response_body(response.body) if response && response.respond_to?(:body)
    end

    def logger
      Airbrake.logger
    end
    
    def setup_http_connection
      http =
        Net::HTTP::Proxy(proxy_host, proxy_port, proxy_user, proxy_pass).
        new(url.host, url.port)

      http.read_timeout = http_read_timeout
      http.open_timeout = http_open_timeout

      if secure?
        http.use_ssl     = true

        if use_system_ssl_cert_chain? && File.exist?(OpenSSL::X509::DEFAULT_CERT_FILE)
          http.ca_file     = OpenSSL::X509::DEFAULT_CERT_FILE
        else
          http.ca_file     = Sender.local_cert_path # ca-bundle.crt built from source, see resources/README.md
        end
        http.verify_mode = OpenSSL::SSL::VERIFY_PEER
      else
        http.use_ssl     = false
      end
      
      http
    rescue => e
      log :error, "[Airbrake::Sender#setup_http_connection] Failure initializing the HTTP connection.\nError: #{e.class} - #{e.message}\nBacktrace:\n#{e.backtrace.join("\n\t")}"
      raise e
    end

  end
end