RED Cover Inspector

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RED Cover Inspector

Adds simple cover preview label if needs updating for excessive size or unsupported host
当前为 2020-09-21 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         RED Cover Inspector
// @namespace    http://greasyfork.icu/users/321857-anakunda
// @version      1.0
// @description  Adds simple cover preview label if needs updating for excessive size or unsupported host
// @author       Anakunda
// @copyright    2020, Anakunda (http://greasyfork.icu/users/321857-anakunda)
// @license      GPL-3.0-or-later
// @match        https://redacted.ch/torrents.php?id=*
// @connect      *
// @grant        GM_xmlhttpRequest
// @grant        GM_getValue
// @grant        GM_setValue
// ==/UserScript==

function getRemoteFileSize(url) {
  return new Promise(function(resolve, reject) {
	var imageSize, abort = GM_xmlhttpRequest({
	  method: 'GET', url: url, responseType: 'arraybuffer',
	  onreadystatechange: function(response) {
		if (imageSize || response.readyState < XMLHttpRequest.HEADERS_RECEIVED
			|| !/^(?:Content-Length):\s*(\d+)\b/im.test(response.responseHeaders)) return;
		if (!(imageSize = parseInt(RegExp.$1))) return;
		resolve(imageSize);
		abort.abort();
	  },
	  onload: function(response) { // fail-safe
		if (imageSize) return;
		if (response.status >= 200 && response.status < 400) resolve(response.responseText.length /*response.response.byteLength*/);
			else reject('image not accessible');
	  },
	  onerror: response => { reject('image not accessible') },
	  ontimeout: response => { reject('image not accessible') },
	});
  });
}

function formattedSize(size) {
  return size < 1024**1 ? Math.round(size) + ' B'
	: size < 1024**2 ? (Math.round(size * 10 / 2**10) / 10) + ' KiB'
	: size < 1024**3 ? (Math.round(size * 100 / 2**20) / 100) + ' MiB'
	: size < 1024**4 ? (Math.round(size * 100 / 2**30) / 100) + ' GiB'
	: size < 1024**5 ? (Math.round(size * 100 / 2**40) / 100) + ' TiB'
	: (Math.round(size * 100 / 2**50) / 100) + ' PiB';
}

var acceptableCoverSize = GM_getValue('acceptable_cover_size');
if (!(acceptableCoverSize > 0)) GM_setValue('acceptable_cover_size', acceptableCoverSize = 2048);

document.querySelectorAll('div#covers p > img').forEach(function(img) {
  getRemoteFileSize(img.src).catch(function(reason) {
	console.warn('Failed to get remote image size (' + img.src + '):', reason);
	return undefined;
  }).then(function(size) {
	const isProxied = img.src.startsWith('https://redacted.ch/image.php?'),
		  isPreferredHost = img.src.startsWith('https://ptpimg.me'),
		  isSizeOK = !(size > acceptableCoverSize * 2**10);
	if (isPreferredHost && isSizeOK) return;
	let div = document.createElement('div');
	div.innerHTML = (isSizeOK ? '<span>' : '<span style="color: yellow;">') + formattedSize(size) +
	  '</span> / <span>' + img.naturalWidth + '×' + img.naturalHeight + '</span>';
	if (isProxied) div.innerHTML = '<span style="color: yellow;">[PROXY]</span> / ' + div.innerHTML;
		else if (!isPreferredHost) div.innerHTML = '<span style="color: yellow;">[EXTERNAL]</span> / ' + div.innerHTML;
	div.style = 'color: white; border: 1px solid whitesmoke; background-color: #ae2300; ' +
	  'position: relative; bottom: 25px; right: 5px; font: 700 8pt "Segoe UI"; float: right; padding: 1px 5px;';
	img.insertAdjacentElement('afterend', div);
  });
});