为什么 semrushbot 和 ahrefsbot 默认被阻止？

neounix · 2020 年12 月 3 日 09:35

你试过这个方法吗（但请将容器名称替换为你自己的容器名称）？

注意：你也可以在管理界面（Admin UI）中配置此项：

# docker exec -it socket-only bash
root@socket-only:/# rails c
[1] pry(main)> SiteSetting.blocked_crawler_user_agents
=> "mauibot|semrushbot|ahrefsbot|blexbot|seo spider"
[2] pry(main)> SiteSetting.blocked_crawler_user_agents = ""
=> ""
[3] pry(main)> SiteSetting.blocked_crawler_user_agents
=> ""
[4] pry(main)>

另请参阅：

github.com/discourse/discourse

config/site_settings.yml

d1d87b6fa

# Available options:
#
# default            - The default value of the setting. For upload site settings, use the id of the upload seeded in db/fixtures/010_uploads.rb.
# client             - Set to true if the javascript should have access to this setting's value.
# refresh            - Set to true if clients should refresh when the setting is changed.
# min                - For a string setting, the minimum length. For an integer setting, the minimum value.
# max                - For a string setting, the maximum length. For an integer setting, the maximum value.
# regex              - A regex that the value must match.
# validator          - The name of the class that will be use to validate the value of the setting.
# allow_any          - For choice settings allow items not specified in the choice list (default true)
# secret             - Set to true if input type should be password and value needs to be scrubbed from logs (default false).
# enum               - The setting has a fixed set of allowed values, and only one can be chosen.
#                      Set to the class name that defines the set.
# locale_default     - A hash which overrides according to `SiteSetting.default_locale`.
#                      The key should be as the same as possible value of default_locale.
#
#
# type: email    - Must be a valid email address.
# type: username - Must match the username of an existing user.
# type: list     - A list of values, chosen from a set of valid values defined in the choices option.

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另请参阅：

  def self.allow_crawler?(user_agent)
    return true if SiteSetting.allowed_crawler_user_agents.blank? &&
      SiteSetting.blocked_crawler_user_agents.blank?
...
...

github.com/discourse/discourse

lib/crawler_detection.rb

e0d923225

# frozen_string_literal: true

module CrawlerDetection
  WAYBACK_MACHINE_URL = "archive.org"

  def self.to_matcher(string, type: nil)
    escaped = string.split('|').map { |agent| Regexp.escape(agent) }.join('|')

    if type == :real && Rails.env == "test"
      # we need this bypass so we properly render views
      escaped << "|Rails Testing"
    end

    Regexp.new(escaped, Regexp::IGNORECASE)
  end

  def self.crawler?(user_agent, via_header = nil)
    return true if user_agent.nil? || user_agent&.include?(WAYBACK_MACHINE_URL) || via_header&.include?(WAYBACK_MACHINE_URL)

    # this is done to avoid regenerating regexes

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从代码中可以看出，如果你将这两个站点设置设为“空白”，则不会进行任何封锁：

SiteSetting.allowed_crawler_user_agents
SiteSetting.blocked_crawler_user_agents

我建议你不要修改这些设置，因为 Discourse 核心默认封锁的这些爬虫并不遵守 robots.txt 协议；不过，这是你的网站，你可以按自己的意愿操作。核心中默认封锁它们是有充分理由的。

话虽如此，Discourse 确实提供了通过 UI 中的站点设置（SiteSettings）来“解除封锁”这些爬虫的选项。

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为什么 semrushbot 和 ahrefsbot 默认被阻止？

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