Use Search::GlobalService.new in the `GET /projects/search/:query` endpoint

Also streamline the sorting part while we're at it.

That being done, there's currently a duplication between
`GET /projects/search/:query` and `GET /projects?search=:search`
so we might want to keep only the latter for 9.0...
Signed-off-by: Rémy Coutable <remy@rymai.me>

CHANGELOG

@@ -14,6 +14,7 @@ v 8.12.0 (unreleased)
   - Add font color contrast to external label in admin area (ClemMakesApps)
   - Change logo animation to CSS (ClemMakesApps)
   - Instructions for enabling Git packfile bitmaps !6104
+  - Use Search::GlobalService.new in the `GET /projects/search/:query` endpoint
   - Fix pagination on user snippets page
   - Escape search term before passing it to Regexp.new !6241 (winniehell)
   - Fix pinned sidebar behavior in smaller viewports !6169
@@ -111,7 +112,6 @@ v 8.12.0 (unreleased)
   - Use default clone protocol on "check out, review, and merge locally" help page URL
   - API for Ci Lint !5953 (Katarzyna Kobierska Urszula Budziszewska)
   - Allow bulk update merge requests from merge requests index page
-  - Project search API is now agnostic to casing
 
 v 8.11.6 (unreleased)
 

lib/api/projects.rb

@@ -428,18 +428,9 @@ module API
       # Example Request:
       #   GET /projects/search/:query
       get "/search/:query" do
-        ids = current_user.authorized_projects.map(&:id)
-        visibility_levels = [ Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PUBLIC ]
-        projects = Project.where("(id in (?) OR visibility_level in (?)) AND (LOWER(name) LIKE LOWER((?)))", ids, visibility_levels, "%#{params[:query]}%")
-        sort = params[:sort] == 'desc' ? 'desc' : 'asc'
-
-        projects = case params["order_by"]
-                   when 'id' then projects.order("id #{sort}")
-                   when 'name' then projects.order("name #{sort}")
-                   when 'created_at' then projects.order("created_at #{sort}")
-                   when 'last_activity_at' then projects.order("last_activity_at #{sort}")
-                   else projects
-                   end
+        search_service = Search::GlobalService.new(current_user, search: params[:query]).execute
+        projects = search_service.objects('projects', params[:page])
+        projects = projects.reorder(project_order_by => project_sort)
 
         present paginate(projects), with: Entities::Project
       end