New API method: /api/v1/search

Returns accounts, statuses, hashtags arrays

app/services/account_search_service.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class AccountSearchService < BaseService
+  def call(query, limit, resolve = false, account = nil)
+    return [] if query.blank? || query.start_with?('#')
+
+    username, domain = query.gsub(/\A@/, '').split('@')
+    domain = nil if TagManager.instance.local_domain?(domain)
+
+    if domain.nil?
+      exact_match = Account.find_local(username)
+      results     = account.nil? ? Account.search_for(username, limit) : Account.advanced_search_for(username, account, limit)
+    else
+      exact_match = Account.find_remote(username, domain)
+      results     = account.nil? ? Account.search_for("#{username} #{domain}", limit) : Account.advanced_search_for("#{username} #{domain}", account, limit)
+    end
+
+    results = [exact_match] + results.reject { |a| a.id == exact_match.id } if exact_match
+
+    if resolve && !exact_match && !domain.nil?
+      results = [FollowRemoteAccountService.new.call("#{username}@#{domain}")]
+    end
+
+    results
+  end
+end