Init commit

server/core/lib/plugins/theme-utils.ts

@@ -0,0 +1,20 @@
+import { DEFAULT_THEME_NAME, DEFAULT_INSTANCE_THEME_NAME } from '../../initializers/constants.js'
+import { PluginManager } from './plugin-manager.js'
+import { CONFIG } from '../../initializers/config.js'
+import { ServerConfigManager } from '../server-config-manager.js'
+
+export function getThemeOrDefault (name: string, defaultTheme: string) {
+  if (isThemeRegistered(name)) return name
+
+  // Fallback to admin default theme
+  if (name !== CONFIG.THEME.DEFAULT) return getThemeOrDefault(CONFIG.THEME.DEFAULT, DEFAULT_THEME_NAME)
+
+  return defaultTheme
+}
+
+export function isThemeRegistered (name: string) {
+  if (name === DEFAULT_THEME_NAME || name === DEFAULT_INSTANCE_THEME_NAME) return true
+
+  return PluginManager.Instance.getRegisteredThemes().some(r => r.name === name) ||
+    ServerConfigManager.Instance.getBuiltInThemes().some(r => r.name === name)
+}