mirror of
https://github.com/discourse/discourse.git
synced 2024-11-22 08:57:10 -06:00
99 lines
2.6 KiB
Ruby
99 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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class ContentSecurityPolicy
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module Extension
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extend self
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def site_setting_extension
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{ script_src: SiteSetting.content_security_policy_script_src.split("|") }
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end
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def plugin_extensions
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[].tap do |extensions|
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Discourse.plugins.each do |plugin|
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extensions.concat(plugin.csp_extensions) if plugin.enabled?
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end
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end
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end
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THEME_SETTING = "extend_content_security_policy"
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def theme_extensions(theme_id)
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key = "theme_extensions_#{theme_id}"
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cache.defer_get_set(key) { find_theme_extensions(theme_id) }
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end
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def clear_theme_extensions_cache!
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cache.clear
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end
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private
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def cache
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@cache ||= DistributedCache.new("csp_extensions")
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end
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def find_theme_extensions(theme_id)
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extensions = []
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theme_ids = Theme.transform_ids(theme_id)
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Theme
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.where(id: theme_ids)
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.find_each do |theme|
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theme.cached_settings.each do |setting, value|
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extensions << build_theme_extension(value.split("|")) if setting.to_s == THEME_SETTING
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end
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end
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extensions << build_theme_extension(
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ThemeModifierHelper.new(theme_ids: theme_ids).csp_extensions,
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)
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html_fields =
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ThemeField.where(
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theme_id: theme_ids,
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target_id: ThemeField.basic_targets.map { |target| Theme.targets[target.to_sym] },
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name: ThemeField.html_fields,
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)
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auto_script_src_extension = { script_src: [] }
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html_fields.each(&:ensure_baked!)
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doc = html_fields.map(&:value_baked).join("\n")
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Nokogiri::HTML5
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.fragment(doc)
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.css("script[src]")
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.each do |node|
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src = node["src"]
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uri = URI(src)
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next if GlobalSetting.cdn_url && src.starts_with?(GlobalSetting.cdn_url) # Ignore CDN urls (theme-javascripts)
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next if uri.host.nil? # Ignore same-domain scripts (theme-javascripts)
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next if uri.path.nil? # Ignore raw hosts
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uri.query = nil # CSP should not include query part of url
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uri_string = uri.to_s.sub(%r{\A//}, "") # Protocol-less CSP should not have // at beginning of URL
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auto_script_src_extension[:script_src] << uri_string
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rescue URI::Error
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# Ignore invalid URI
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end
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extensions << auto_script_src_extension
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extensions
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end
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def build_theme_extension(entries)
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{}.tap do |extension|
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entries.each do |entry|
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directive, source = entry.split(":", 2).map(&:strip)
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extension[directive] ||= []
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extension[directive] << source
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end
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end
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end
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end
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end
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