discourse/lib/content_security_policy/middleware.rb

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# frozen_string_literal: true
require_dependency 'content_security_policy'
class ContentSecurityPolicy
class Middleware
def initialize(app)
@app = app
end
def call(env)
request = Rack::Request.new(env)
_, headers, _ = response = @app.call(env)
return response unless html_response?(headers)
# The EnforceHostname middleware ensures request.host_with_port can be trusted
protocol = (SiteSetting.force_https || request.ssl?) ? "https://" : "http://"
base_url = protocol + request.host_with_port + Discourse.base_uri
theme_ids = env[:resolved_theme_ids]
headers['Content-Security-Policy'] = policy(theme_ids, base_url: base_url, path_info: env["PATH_INFO"]) if SiteSetting.content_security_policy
headers['Content-Security-Policy-Report-Only'] = policy(theme_ids, base_url: base_url, path_info: env["PATH_INFO"]) if SiteSetting.content_security_policy_report_only
response
end
private
delegate :policy, to: :ContentSecurityPolicy
def html_response?(headers)
headers['Content-Type'] && headers['Content-Type'] =~ /html/
end
end
end