1 files changed, 64 insertions, 0 deletions
diff --git a/core/src/OCP/loader.js b/core/src/OCP/loader.js
new file mode 100644
index 00000000000..d307eb27996
--- /dev/null
+++ b/core/src/OCP/loader.js
@@ -0,0 +1,64 @@
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { generateFilePath } from '@nextcloud/router'
+
+const loadedScripts = {}
+const loadedStylesheets = {}
+/**
+ * @namespace OCP
+ * @class Loader
+ */
+export default {
+
+	/**
+	 * Load a script asynchronously
+	 *
+	 * @param {string} app the app name
+	 * @param {string} file the script file name
+	 * @return {Promise}
+	 */
+	loadScript(app, file) {
+		const key = app + file
+		if (Object.prototype.hasOwnProperty.call(loadedScripts, key)) {
+			return Promise.resolve()
+		}
+		loadedScripts[key] = true
+		return new Promise(function(resolve, reject) {
+			const scriptPath = generateFilePath(app, 'js', file)
+			const script = document.createElement('script')
+			script.src = scriptPath
+			script.setAttribute('nonce', btoa(OC.requestToken))
+			script.onload = () => resolve()
+			script.onerror = () => reject(new Error(`Failed to load script from ${scriptPath}`))
+			document.head.appendChild(script)
+		})
+	},
+
+	/**
+	 * Load a stylesheet file asynchronously
+	 *
+	 * @param {string} app the app name
+	 * @param {string} file the script file name
+	 * @return {Promise}
+	 */
+	loadStylesheet(app, file) {
+		const key = app + file
+		if (Object.prototype.hasOwnProperty.call(loadedStylesheets, key)) {
+			return Promise.resolve()
+		}
+		loadedStylesheets[key] = true
+		return new Promise(function(resolve, reject) {
+			const stylePath = generateFilePath(app, 'css', file)
+			const link = document.createElement('link')
+			link.href = stylePath
+			link.type = 'text/css'
+			link.rel = 'stylesheet'
+			link.onload = () => resolve()
+			link.onerror = () => reject(new Error(`Failed to load stylesheet from ${stylePath}`))
+			document.head.appendChild(link)
+		})
+	},
+}