1 files changed, 92 insertions, 0 deletions
diff --git a/app/finders/labels_finder.rb b/app/finders/labels_finder.rb
new file mode 100644
index 00000000000..6ace14a4bb5
--- /dev/null
+++ b/app/finders/labels_finder.rb
@@ -0,0 +1,92 @@
+class LabelsFinder < UnionFinder
+  def initialize(current_user, params = {})
+    @current_user = current_user
+    @params = params
+  end
+
+  def execute(authorized_only: true)
+    @authorized_only = authorized_only
+
+    items = find_union(label_ids, Label)
+    items = with_title(items)
+    sort(items)
+  end
+
+  private
+
+  attr_reader :current_user, :params, :authorized_only
+
+  def label_ids
+    label_ids = []
+
+    if project
+      label_ids << project.group.labels if project.group.present?
+      label_ids << project.labels
+    else
+      label_ids << Label.where(group_id: projects.group_ids)
+      label_ids << Label.where(project_id: projects.select(:id))
+    end
+
+    label_ids
+  end
+
+  def sort(items)
+    items.reorder(title: :asc)
+  end
+
+  def with_title(items)
+    items = items.where(title: title) if title
+    items
+  end
+
+  def group_id
+    params[:group_id].presence
+  end
+
+  def project_id
+    params[:project_id].presence
+  end
+
+  def projects_ids
+    params[:project_ids].presence
+  end
+
+  def title
+    params[:title].presence || params[:name].presence
+  end
+
+  def project
+    return @project if defined?(@project)
+
+    if project_id
+      @project = find_project
+    else
+      @project = nil
+    end
+
+    @project
+  end
+
+  def find_project
+    if authorized_only
+      available_projects.find_by(id: project_id)
+    else
+      Project.find_by(id: project_id)
+    end
+  end
+
+  def projects
+    return @projects if defined?(@projects)
+
+    @projects = authorized_only ? available_projects : Project.all
+    @projects = @projects.in_namespace(group_id) if group_id
+    @projects = @projects.where(id: projects_ids) if projects_ids
+    @projects = @projects.reorder(nil)
+
+    @projects
+  end
+
+  def available_projects
+    @available_projects ||= ProjectsFinder.new.execute(current_user)
+  end
+end