User:SunAfterRain/js/download.js

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$.when(
	mw.loader.getState('ext.gadget.HanAssist')
		? mw.loader.using('ext.gadget.HanAssist')
		: new Promise((resolve, reject) => {
			const hook = mw.hook('userscript.SunAfterRain.HanAssist.ready');
			function hookCallback(HanAssist) {
				hook.remove(hookCallback);
				mw.loader.using([])
					.then((origRequire) => resolve(
						(module) => module === 'ext.gadget.HanAssist'
							? HanAssist
							: origRequire(module)
					));
			}
			hook.add(hookCallback);
		}),
	$.ready
).then((require) => {
	if (
		!mw.config.get('wgArticleId') ||
		!mw.config.get('wgRevisionId') ||
		mw.config.get('wgAction') !== 'view' ||
		mw.config.get('wgDiffOldId')
	) {
		return;
	}
	
	const batchLocalize = require('ext.gadget.HanAssist').batchConv;
	const msgs = batchLocalize({
		portlet: {
			hans: '下载',
			hant: '下載'
		},
		portletInfo: {
			hans: '下载本页',
			hant: '下載本頁'
		},
		prompt: {
			hans: '文件名称：',
			hant: '檔案名稱：'
		},
		downloadSuccess: {
			hans: '已下载文件。',
			hant: '已下載檔案。'
		},
		downloadError: {
			hans: '下载失败：',
			hant: '下載失敗：'
		},
		downloadCancel: {
			hans: '已取消下载文件。',
			hant: '已取消下載檔案。'
		},
	});

	$(mw.util.addPortletLink(
		'p-cactions',
		'',
		msgs.portlet,
		't-download',
		msgs.portletInfo
	)).on('click', (e) => {
		e.preventDefault();

		const oldid = mw.config.get('wgRevisionId');
		let suffix = '.txt';
		let type = 'text/plain';

		switch (mw.config.get('wgPageContentModel')) {
			case 'wikitext':
				suffix = '.wikitext';
				type = 'text/x-wiki';
				break;
			case 'javascript':
				suffix = '.js';
				type = 'text/javascript';
				break;
			case 'css':
			case 'sanitized-css':
				suffix = '.css';
				type = 'text/css';
				break;
			case 'Scribunto':
				suffix = '.lua';
				type = 'text/lua';
				break;
		}
		
		const defaultFile = [
			mw.config.get('wgPageName')
				.replace(/[:\/\\*?'<>|]/g, '-')
				.replace(new RegExp(suffix.replace(/\./g, '\\.') + '$'), ''),
			'_',
			mw.config.get('wgRevisionId'),
			suffix
		].join('');
		let file = prompt(msgs.prompt, defaultFile);
		if (file === null) {
			mw.notify(msgs.downloadCancel, {
				title: 'download.js',
				type: 'warn',
			});
			return;
		}
		file = file || defaultFile;

		fetch(
			mw.util.wikiScript('index') + '?' + new URLSearchParams({
				action: 'raw',
				oldid,
				ctype: 'text/x-wiki',
			}).toString()
		).then(async (response) => {
			const blob = new Blob([await response.arrayBuffer()], {
				type,
			});

			$('<a>')
				.attr({
					href: URL.createObjectURL(blob),
					download: file,
				})
				.get(0)
				.click();
				
			mw.notify(msgs.downloadSuccess, {
				title: 'download.js',
				type: 'success',
			});
		}).catch((error) => {
			console.error(error);
			mw.notify(msgs.downloadError + String(error), {
				title: 'download.js',
				type: 'error',
				autoHide: false,
			});
		});
	});
});