HTTP signatures (#4146)

* Add Request class with HTTP signature generator

Spec: https://tools.ietf.org/html/draft-cavage-http-signatures-06

* Add HTTP signature verification concern

* Add test for SignatureVerification concern

* Add basic test for Request class

* Make PuSH subscribe/unsubscribe requests use new Request class

Accidentally fix lease_seconds not being set and sent properly, and
change the new minimum subscription duration to 1 day

* Make all PuSH workers use new Request class

* Make Salmon sender use new Request class

* Make FetchLinkService use new Request class

* Make FetchAtomService use the new Request class

* Make Remotable use the new Request class

* Make ResolveRemoteAccountService use the new Request class

* Add more tests

* Allow +-30 seconds window for signed request to remain valid

* Disable time window validation for signed requests, restore 7 days
as PuSH subscription duration (which was previous default due to a bug)

1 files changed, 2 insertions, 4 deletions

diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index 6ef3abb66..20c85e0ea 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 
 class FetchLinkCardService < BaseService
-  include HttpHelper
-
   URL_PATTERN = %r{https?://\S+}
 
   def call(status)
@@ -13,7 +11,7 @@ class FetchLinkCardService < BaseService
 
     url  = url.to_s
     card = PreviewCard.where(status: status).first_or_initialize(status: status, url: url)
-    res  = http_client.head(url)
+    res  = Request.new(:head, url).perform
 
     return if res.code != 200 || res.mime_type != 'text/html'
 
@@ -80,7 +78,7 @@ class FetchLinkCardService < BaseService
   end
 
   def attempt_opengraph(card, url)
-    response = http_client.get(url)
+    response = Request.new(:get, url).perform
 
     return if response.code != 200 || response.mime_type != 'text/html'