108 lines
2.8 KiB
Ruby
108 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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require_dependency 'global_path'
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class ContentSecurityPolicy
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include GlobalPath
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class Middleware
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def initialize(app)
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@app = app
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end
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def call(env)
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request = Rack::Request.new(env)
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_, headers, _ = response = @app.call(env)
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return response unless html_response?(headers) && ContentSecurityPolicy.enabled?
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policy = ContentSecurityPolicy.new(request).build
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headers['Content-Security-Policy'] = policy if SiteSetting.content_security_policy
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headers['Content-Security-Policy-Report-Only'] = policy if SiteSetting.content_security_policy_report_only
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response
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end
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private
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def html_response?(headers)
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headers['Content-Type'] && headers['Content-Type'] =~ /html/
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end
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end
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def self.enabled?
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SiteSetting.content_security_policy || SiteSetting.content_security_policy_report_only
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end
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def initialize(request = nil)
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@request = request
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@directives = {
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script_src: script_src,
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worker_src: [:self, :blob],
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}
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@directives[:report_uri] = path('/csp_reports') if SiteSetting.content_security_policy_collect_reports
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end
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def build
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policy = ActionDispatch::ContentSecurityPolicy.new
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@directives.each do |directive, sources|
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if sources.is_a?(Array)
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policy.public_send(directive, *sources)
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else
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policy.public_send(directive, sources)
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end
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end
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policy.build
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end
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private
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attr_reader :request
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SCRIPT_ASSET_DIRECTORIES = [
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# [dir, can_use_s3_cdn, can_use_cdn]
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['/assets/', true, true],
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['/brotli_asset/', true, true],
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['/extra-locales/', false, false],
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['/highlight-js/', false, true],
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['/javascripts/', false, true],
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['/plugins/', false, true],
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['/theme-javascripts/', false, true],
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['/svg-sprite/', false, true],
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]
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def script_assets(base = base_url, s3_cdn = GlobalSetting.s3_cdn_url, cdn = GlobalSetting.cdn_url)
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SCRIPT_ASSET_DIRECTORIES.map do |dir, can_use_s3_cdn, can_use_cdn|
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if can_use_s3_cdn && s3_cdn
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s3_cdn + dir
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elsif can_use_cdn && cdn
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cdn + dir
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else
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base + dir
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end
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end
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end
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def script_src
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sources = [
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:unsafe_eval,
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"#{base_url}/logs/",
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"#{base_url}/sidekiq/",
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"#{base_url}/mini-profiler-resources/",
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]
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sources.concat(script_assets)
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sources << 'https://www.google-analytics.com' if SiteSetting.ga_universal_tracking_code.present?
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sources << 'https://www.googletagmanager.com' if SiteSetting.gtm_container_id.present?
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sources.concat(SiteSetting.content_security_policy_script_src.split('|'))
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end
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def base_url
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@base_url ||= Rails.env.development? ? request.host_with_port : Discourse.base_url
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end
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end
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