Add specific rate limits for posting and following (#13172)

app/models/concerns/account_interactions.rb

@@ -87,10 +87,10 @@ module AccountInteractions
     has_many :announcement_mutes, dependent: :destroy
   end
 
-  def follow!(other_account, reblogs: nil, uri: nil)
+  def follow!(other_account, reblogs: nil, uri: nil, rate_limit: false)
     reblogs = true if reblogs.nil?
 
-    rel = active_relationships.create_with(show_reblogs: reblogs, uri: uri)
+    rel = active_relationships.create_with(show_reblogs: reblogs, uri: uri, rate_limit: rate_limit)
                               .find_or_create_by!(target_account: other_account)
 
     rel.update!(show_reblogs: reblogs)
@@ -99,6 +99,18 @@ module AccountInteractions
     rel
   end
 
+  def request_follow!(other_account, reblogs: nil, uri: nil, rate_limit: false)
+    reblogs = true if reblogs.nil?
+
+    rel = follow_requests.create_with(show_reblogs: reblogs, uri: uri, rate_limit: rate_limit)
+                         .find_or_create_by!(target_account: other_account)
+
+    rel.update!(show_reblogs: reblogs)
+    remove_potential_friendship(other_account)
+
+    rel
+  end
+
   def block!(other_account, uri: nil)
     remove_potential_friendship(other_account)
     block_relationships.create_with(uri: uri)

app/models/concerns/rate_limitable.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module RateLimitable
+  extend ActiveSupport::Concern
+
+  def rate_limit=(value)
+    @rate_limit = value
+  end
+
+  def rate_limit?
+    @rate_limit
+  end
+
+  def rate_limiter(by, options = {})
+    return @rate_limiter if defined?(@rate_limiter)
+
+    @rate_limiter = RateLimiter.new(by, options)
+  end
+
+  class_methods do
+    def rate_limit(options = {})
+      after_create do
+        by = public_send(options[:by])
+
+        if rate_limit? && by&.local?
+          rate_limiter(by, options).record!
+          @rate_limit_recorded = true
+        end
+      end
+
+      after_rollback do
+        rate_limiter(public_send(options[:by]), options).rollback! if @rate_limit_recorded
+      end
+    end
+  end
+end