Merge commit '3554c527954441fd924586a49c7d99a89101ac7e' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/authorize_interactions_controller.rb`:
  Small conflict due to our theming system.
- `streaming/index.js`:
  Upstream refactored part of the streaming server.
  We had some extra logic for handling local-only posts.
  Applied the refactor.

app/controllers/api/v1/instances/peers_controller.rb

@@ -15,7 +15,7 @@ class Api::V1::Instances::PeersController < Api::BaseController
 
   def index
     cache_even_if_authenticated!
-    render_with_cache(expires_in: 1.day) { Instance.where.not(domain: DomainBlock.select(:domain)).pluck(:domain) }
+    render_with_cache(expires_in: 1.day) { Instance.searchable.pluck(:domain) }
   end
 
   private

app/controllers/api/v1/peers/search_controller.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+class Api::V1::Peers::SearchController < Api::BaseController
+  before_action :require_enabled_api!
+  before_action :set_domains
+
+  skip_before_action :require_authenticated_user!, unless: :whitelist_mode?
+  skip_around_action :set_locale
+
+  vary_by ''
+
+  def index
+    cache_even_if_authenticated!
+    render json: @domains
+  end
+
+  private
+
+  def require_enabled_api!
+    head 404 unless Setting.peers_api_enabled && !whitelist_mode?
+  end
+
+  def set_domains
+    return if params[:q].blank?
+
+    if Chewy.enabled?
+      @domains = InstancesIndex.query(function_score: {
+        query: {
+          prefix: {
+            domain: params[:q],
+          },
+        },
+
+        field_value_factor: {
+          field: 'accounts_count',
+          modifier: 'log2p',
+        },
+      }).limit(10).pluck(:domain)
+    else
+      domain = params[:q].strip
+      domain = TagManager.instance.normalize_domain(domain)
+      @domains = Instance.searchable.where(Instance.arel_table[:domain].matches("#{Instance.sanitize_sql_like(domain)}%", false, true)).limit(10).pluck(:domain)
+    end
+  end
+end