refactor: Move public script to TypeScript

Signed-off-by: Christopher Ng <chrng8@gmail.com>

Author: Pytal

src/public.js

@@ -0,0 +1,103 @@
+/**
+ * @copyright Copyright (c) 2021 John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ * @author John Molakvoæ <skjnldsv@protonmail.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+import { loadState } from '@nextcloud/initial-state'
+import { translate as t, translatePlural as n } from '@nextcloud/l10n'
+
+import '../css/public.css'
+
+import { logger } from './logger.ts'
+
+const { limit, downloads } = loadState('files_downloadlimit', 'download_limit', { limit: -1, downloads: 0 })
+logger.debug('Download limit', { limit, downloads })
+
+// Global variables init on page load
+let count = limit - downloads
+let clicks = 0
+
+/**
+ * Update the span counter message
+ *
+ * @param span html span element to update
+ * @param count number of remaining downloads allowed
+ */
+const updateCounter = (span: HTMLSpanElement, count: number) => {
+	if (count === 0) {
+		span.innerText = t('files_downloadlimit', 'You have reached the maximum amount of downloads allowed')
+	} else {
+		span.innerText = n('files_downloadlimit', '1 remaining download allowed', '{count} remaining downloads allowed', count, { count })
+	}
+}
+
+window.addEventListener('DOMContentLoaded', () => {
+	if (limit < 1) {
+		return
+	}
+
+	const container = document.getElementById('header-primary-action')
+	if (!container) {
+		return
+	}
+
+	const span = document.createElement('span')
+	span.setAttribute('style', 'color: var(--color-primary-text); padding: 0 10px;')
+	updateCounter(span, count)
+	container.prepend(span)
+
+	const publicContent = document.querySelector<HTMLElement>('#files-public-content')
+	if (!publicContent) {
+		return
+	}
+
+	// Preventing mouse interaction
+	publicContent.oncontextmenu = (event) => {
+		event.preventDefault()
+		event.stopPropagation()
+		return false
+	}
+
+	// Adding double-download warning
+	const downloadButtons = document.querySelectorAll<HTMLAnchorElement>('a[href*="/download/"]') || []
+	new Set(downloadButtons).forEach(button => {
+		button.addEventListener('click', (event) => {
+			// Warn about download limits
+			if (clicks > 0) {
+				if (!confirm(t('files_downloadlimit', 'This share has a limited number of downloads. Are you sure you want to trigger a new download?'))) {
+					event.preventDefault()
+					event.stopPropagation()
+					return
+				}
+			}
+
+			// Handle counts changes
+			count--
+			clicks++
+			updateCounter(span, count)
+
+			// Remove the buttons if share is now expired
+			if (count === 0) {
+				[...downloadButtons].forEach(button => button.remove())
+			}
+		})
+	})
+})