1 files changed, 69 insertions, 0 deletions
diff --git a/app/services/projects/update_pages_configuration_service.rb b/app/services/projects/update_pages_configuration_service.rb
new file mode 100644
index 00000000000..eb4809afa85
--- /dev/null
+++ b/app/services/projects/update_pages_configuration_service.rb
@@ -0,0 +1,69 @@
+module Projects
+  class UpdatePagesConfigurationService < BaseService
+    attr_reader :project
+
+    def initialize(project)
+      @project = project
+    end
+
+    def execute
+      update_file(pages_config_file, pages_config.to_json)
+      reload_daemon
+      success
+    rescue => e
+      error(e.message)
+    end
+
+    private
+
+    def pages_config
+      {
+        domains: pages_domains_config
+      }
+    end
+
+    def pages_domains_config
+      project.pages_domains.map do |domain|
+        {
+          domain: domain.domain,
+          certificate: domain.certificate,
+          key: domain.key,
+        }
+      end
+    end
+
+    def reload_daemon
+      # GitLab Pages daemon constantly watches for modification time of `pages.path`
+      # It reloads configuration when `pages.path` is modified
+      update_file(pages_update_file, SecureRandom.hex(64))
+    end
+
+    def pages_path
+      @pages_path ||= project.pages_path
+    end
+
+    def pages_config_file
+      File.join(pages_path, 'config.json')
+    end
+
+    def pages_update_file
+      File.join(::Settings.pages.path, '.update')
+    end
+
+    def update_file(file, data)
+      unless data
+        FileUtils.remove(file, force: true)
+        return
+      end
+
+      temp_file = "#{file}.#{SecureRandom.hex(16)}"
+      File.open(temp_file, 'w') do |f|
+        f.write(data)
+      end
+      FileUtils.move(temp_file, file, force: true)
+    ensure
+      # In case if the updating fails
+      FileUtils.remove(temp_file, force: true)
+    end
+  end
+end