Add HTTP signatures to all outgoing ActivityPub GET requests (#11284)

app/helpers/jsonld_helper.rb

@@ -77,19 +77,12 @@ module JsonLdHelper
   end
 
   def fetch_resource_without_id_validation(uri, on_behalf_of = nil, raise_on_temporary_error = false)
+    on_behalf_of ||= Account.representative
+
     build_request(uri, on_behalf_of).perform do |response|
       raise Mastodon::UnexpectedResponseError, response unless response_successful?(response) || response_error_unsalvageable?(response) || !raise_on_temporary_error
 
-      return body_to_json(response.body_with_limit) if response.code == 200
-    end
-
-    # If request failed, retry without doing it on behalf of a user
-    return if on_behalf_of.nil?
-
-    build_request(uri).perform do |response|
-      raise Mastodon::UnexpectedResponseError, response unless response_successful?(response) || response_error_unsalvageable?(response) || !raise_on_temporary_error
-
-      response.code == 200 ? body_to_json(response.body_with_limit) : nil
+      body_to_json(response.body_with_limit) if response.code == 200
     end
   end
 

app/lib/request.rb

@@ -40,8 +40,8 @@ class Request
     set_digest! if options.key?(:body)
   end
 
-  def on_behalf_of(account, key_id_format = :acct, sign_with: nil)
-    raise ArgumentError, 'account must be local' unless account&.local?
+  def on_behalf_of(account, key_id_format = :uri, sign_with: nil)
+    raise ArgumentError, 'account must not be nil' if account.nil?
 
     @account       = account
     @keypair       = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : @account.keypair

app/services/fetch_resource_service.rb

@@ -23,7 +23,7 @@ class FetchResourceService < BaseService
   end
 
   def perform_request(&block)
-    Request.new(:get, @url).add_headers('Accept' => ACCEPT_HEADER).perform(&block)
+    Request.new(:get, @url).add_headers('Accept' => ACCEPT_HEADER).on_behalf_of(Account.representative).perform(&block)
   end
 
   def process_response(response, terminal = false)