mirror of
https://github.com/basecamp/once-campfire.git
synced 2026-10-28 00:16:48 +09:00
Jeremy Daer
8f249cbde4
With DISABLE_CONTENT_SECURITY_POLICY=true there's no application policy,
and the hash callback started an empty one, so pages sent an empty
Content-Security-Policy header. Skip the callback then.
(cherry picked from commit 2a449401ec)
36 lines
1.4 KiB
Ruby
36 lines
1.4 KiB
Ruby
# Allows the scripts the importmap helper emits: the inline importmap and its
|
|
# entry-point module by content hash, and the origins its URLs point to. The
|
|
# hashes change only when the importmap does (a deploy), so cached HTML stays
|
|
# valid, unlike a per-request nonce.
|
|
module InlineScriptHashes
|
|
extend ActiveSupport::Concern
|
|
|
|
ENTRY_POINT_SCRIPT = %(import "application")
|
|
|
|
included do
|
|
# With the policy turned off there's nothing to add to, so leave the
|
|
# request without one rather than starting an empty policy
|
|
content_security_policy if: -> { request.content_security_policy } do |policy|
|
|
if sources = policy.directives["script-src"]
|
|
importmap = Rails.application.importmap.to_json(resolver: helpers)
|
|
policy.directives["script-src"] = sources | script_origins(importmap) | script_hashes(importmap, ENTRY_POINT_SCRIPT)
|
|
end
|
|
end
|
|
end
|
|
|
|
private
|
|
# The importmap is resolved by Rails' asset helpers, so its URLs already
|
|
# carry any configured asset host, however it's written: with or without a
|
|
# scheme, protocol-relative, a %d set, or a proc.
|
|
def script_origins(importmap)
|
|
JSON.parse(importmap)["imports"].values.filter_map do |url|
|
|
origin = URI.join(request.base_url, url).origin
|
|
origin unless origin == request.base_url
|
|
end.uniq
|
|
end
|
|
|
|
def script_hashes(*scripts)
|
|
scripts.map { |script| "'sha256-#{Digest::SHA256.base64digest(script)}'" }
|
|
end
|
|
end
|