Class: HttpMimic::Waf::AkamaiSolver

Inherits:
Object
  • Object
show all
Defined in:
lib/http_mimic/waf/akamai_solver.rb

Constant Summary collapse

CONTEXT_JS_PATH = 
File.expand_path('browser_context.js', __dir__)

Class Method Summary collapse

Class Method Details

.extract_sensor_script_url(target_url, html) ⇒ Object 



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# File 'lib/http_mimic/waf/akamai_solver.rb', line 107

def extract_sensor_script_url(target_url, html)
  return nil if html.nil? || html.empty?

  match = html.match(/<script[^>]*src=["\x27]([^"\x27]*\/[a-zA-Z0-9_-]{10,}\?[a-zA-Z0-9_=-]+)["\x27]/i)
  match ||= html.match(/<script[^>]*src=["\x27]([^"\x27]*akam[^"\x27]*)["\x27]/i)
  match ||= html.match(/<script[^>]*src=["\x27]([^"\x27]*\/[a-zA-Z0-9_\-\/]+\?v=[a-zA-Z0-9_-]+)["\x27]/i)

  return nil unless match

  URI.join(target_url, match[1]).to_s
rescue StandardError
  nil
end

.solve(target_url, initial_response, options = {}) ⇒ Object 



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# File 'lib/http_mimic/waf/akamai_solver.rb', line 12

def solve(target_url, initial_response, options = {})
  cookies = initial_response.cookies.dup
  impersonate = options[:impersonate] || HttpMimic.configuration.default_impersonate || 'chrome131'

  sensor_script_url = extract_sensor_script_url(target_url, initial_response.body)
  return nil unless sensor_script_url

  # 1. Fetch the dynamic sensor script
  script_resp = HttpMimic.get(
    sensor_script_url,
    impersonate: impersonate,
    cookies: cookies,
    headers: { 'Referer' => target_url },
    auto_fallback: false,
    solve_waf: false
  )
  return nil unless script_resp.success?

  sensor_js = script_resp.body
  context_js = File.read(CONTEXT_JS_PATH)
  cookie_str = cookies.to_cookie_string

  doc_title = initial_response.title.to_s
  user_agent = options[:user_agent]
  referer = (options[:headers] || {})['Referer'] || (options[:headers] || {})['referer'] || target_url

  # 2. Run virtual browser simulation inside QuickJS
  driver_script = <<~JS
    globalThis.__TARGET_URL__ = #{target_url.to_json};
    globalThis.__DOCUMENT_TITLE__ = #{doc_title.to_json};
    globalThis.__INITIAL_COOKIES__ = #{cookie_str.to_json};
    globalThis.__REFERRER__ = #{referer.to_json};
    #{user_agent ? "globalThis.__USER_AGENT__ = #{user_agent.to_json};" : ""}

    #{context_js}
    #{sensor_js}

    if (typeof globalThis.__simulateHumanInteractions === "function") {
      globalThis.__simulateHumanInteractions();
    }
    if (typeof globalThis.__drainEventLoop === "function") {
      globalThis.__drainEventLoop(100);
    }

    JSON.stringify({
      sensor_posts: globalThis.__sensor_posts
    });
  JS

  result = JSRuntime.eval_json(driver_script)
  sensor_posts = result && result['sensor_posts']
  return nil if sensor_posts.nil? || sensor_posts.empty?

  # 3. Post sensor data to Akamai endpoint
  updated_cookies = cookies.dup
  sensor_posts.each do |post|
    post_body = post['body']
    next if post_body.nil? || post_body.empty?

    post_resp = HttpMimic.post(
      sensor_script_url,
      impersonate: impersonate,
      cookies: updated_cookies,
      headers: {
        'Content-Type' => 'text/plain;charset=UTF-8',
        'Referer' => target_url,
        'Origin' => URI.parse(target_url).tap { |u| u.path = ''; u.query = nil }.to_s,
        'Accept' => '*/*'
      },
      body: post_body,
      auto_fallback: false,
      solve_waf: false
    )

    post_resp.cookies.each { |k, v| updated_cookies[k] = v }
  end

  # 4. Retry original target URL with the updated cookies
  retry_headers = (options[:headers] || {}).merge('Referer' => target_url)
  HttpMimic.get(
    target_url,
    options.merge(
      cookies: updated_cookies,
      headers: retry_headers,
      auto_fallback: false,
      solve_waf: false
    )
  )
rescue StandardError => e
  if HttpMimic.configuration.debug
    puts "[HttpMimic::Waf::AkamaiSolver] Error solving Akamai challenge: #{e.message}"
  end
  nil
end