Class: Kimurai::BrowserBuilder::MechanizeBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/kimurai/browser_builder/mechanize_builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, spider:) ⇒ MechanizeBuilder

Returns a new instance of MechanizeBuilder.



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# File 'lib/kimurai/browser_builder/mechanize_builder.rb', line 11

def initialize(config, spider:)
  @config = config
  @spider = spider
  @logger = spider.logger
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/kimurai/browser_builder/mechanize_builder.rb', line 9

def logger
  @logger
end

#spider ⇒ Object (readonly)

Returns the value of attribute spider.



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# File 'lib/kimurai/browser_builder/mechanize_builder.rb', line 9

def spider
  @spider
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/kimurai/browser_builder/mechanize_builder.rb', line 17

def build
  # Register driver
  Capybara.register_driver :mechanize do |app|
    driver = Capybara::Mechanize::Driver.new("app")
    # keep the history as small as possible (by default it's unlimited)
    driver.configure { |a| a.history.max_size = 2 }
    driver
  end

  # Create browser instance (Capybara session)
  @browser = Capybara::Session.new(:mechanize)
  @browser.spider = spider
  logger.debug "BrowserBuilder (mechanize): created browser instance"

  if @config[:extensions].present?
    logger.error "BrowserBuilder (mechanize): `extensions` option not supported, skipped"
  end

  # Proxy
  if proxy = @config[:proxy].presence
    proxy_string = (proxy.class == Proc ? proxy.call : proxy).strip
    ip, port, type = proxy_string.split(":")

    if type == "http"
      @browser.driver.set_proxy(*proxy_string.split(":"))
      logger.debug "BrowserBuilder (mechanize): enabled http proxy, ip: #{ip}, port: #{port}"
    else
      logger.error "BrowserBuilder (mechanize): can't set #{type} proxy (not supported), skipped"
    end
  end

  # SSL
  if ssl_cert_path = @config[:ssl_cert_path].presence
    @browser.driver.browser.agent.http.ca_file = ssl_cert_path
    logger.debug "BrowserBuilder (mechanize): enabled custom ssl_cert"
  end

  if @config[:ignore_ssl_errors].present?
    @browser.driver.browser.agent.verify_mode = OpenSSL::SSL::VERIFY_NONE
    logger.debug "BrowserBuilder (mechanize): enabled ignore_ssl_errors"
  end

  # Headers
  if headers = @config[:headers].presence
    @browser.driver.headers = headers
    logger.debug "BrowserBuilder (mechanize): enabled custom headers"
  end

  if user_agent = @config[:user_agent].presence
    user_agent_string = (user_agent.class == Proc ? user_agent.call : user_agent).strip

    @browser.driver.add_header("User-Agent", user_agent_string)
    logger.debug "BrowserBuilder (mechanize): enabled custom user_agent"
  end

  # Cookies
  if cookies = @config[:cookies].presence
    cookies.each do |cookie|
      @browser.driver.set_cookie(cookie[:name], cookie[:value], cookie)
    end

    logger.debug "BrowserBuilder (mechanize): enabled custom cookies"
  end

  # Browser instance options
  # skip_request_errors
  if skip_errors = @config[:skip_request_errors].presence
    @browser.config.skip_request_errors = skip_errors
    logger.debug "BrowserBuilder (mechanize): enabled skip_request_errors"
  end

  # retry_request_errors
  if retry_errors = @config[:retry_request_errors].presence
    @browser.config.retry_request_errors = retry_errors
    logger.debug "BrowserBuilder (mechanize): enabled retry_request_errors"
  end

  # restart_if
  if @config[:restart_if].present?
    logger.warn "BrowserBuilder (mechanize): restart_if options not supported by Mechanize, skipped"
  end

  # before_request clear_cookies
  if @config.dig(:before_request, :clear_cookies)
    @browser.config.before_request[:clear_cookies] = true
    logger.debug "BrowserBuilder (mechanize): enabled before_request.clear_cookies"
  end

  # before_request clear_and_set_cookies
  if @config.dig(:before_request, :clear_and_set_cookies)
    if cookies = @config[:cookies].presence
      @browser.config.cookies = cookies
      @browser.config.before_request[:clear_and_set_cookies] = true
      logger.debug "BrowserBuilder (mechanize): enabled before_request.clear_and_set_cookies"
    else
      logger.error "BrowserBuilder (mechanize): cookies should be present to enable before_request.clear_and_set_cookies, skipped"
    end
  end

  # before_request change_user_agent
  if @config.dig(:before_request, :change_user_agent)
    if @config[:user_agent].present? && @config[:user_agent].class == Proc
      @browser.config.user_agent = @config[:user_agent]
      @browser.config.before_request[:change_user_agent] = true
      logger.debug "BrowserBuilder (mechanize): enabled before_request.change_user_agent"
    else
      logger.error "BrowserBuilder (mechanize): user_agent should be present and has lambda format to enable before_request.change_user_agent, skipped"
    end
  end

  # before_request change_proxy
  if @config.dig(:before_request, :change_proxy)
    if @config[:proxy].present? && @config[:proxy].class == Proc
      @browser.config.proxy = @config[:proxy]
      @browser.config.before_request[:change_proxy] = true
      logger.debug "BrowserBuilder (mechanize): enabled before_request.change_proxy"
    else
      logger.error "BrowserBuilder (mechanize): proxy should be present and has lambda format to enable before_request.change_proxy, skipped"
    end
  end

  # before_request delay
  if delay = @config.dig(:before_request, :delay).presence
    @browser.config.before_request[:delay] = delay
    logger.debug "BrowserBuilder (mechanize): enabled before_request.delay"
  end

  # encoding
  if encoding = @config[:encoding]
    @browser.config.encoding = encoding
    logger.debug "BrowserBuilder (mechanize): enabled encoding: #{encoding}"
  end

  # return Capybara session instance
  @browser
end