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Tumblr Images to HD Redirector

Automatically promotes Tumblr image links to raw HD versions

当前为 2017-08-04 提交的版本，查看 最新版本。

// ==UserScript==
// @name         Tumblr Images to HD Redirector
// @namespace    TumblrImgReszr
// @description  Automatically promotes Tumblr image links to raw HD versions
// @version      0.8
// @author       Kai Krause <[email protected]>
// @match        *.media.tumblr.com/*
// @grant        GM_xmlhttpRequest
// @connect      media.tumblr.com
// @run-at       document-start
// ==/UserScript==

// Check if this page contains a single image whose source is also the location.
var image = document.getElementsByTagName('img')[0];
var loc = location.toString();
var imageType = loc.match(/[^.]*$/);
var checkSize;

if (image && image.getAttribute('src') == loc) {
	// Do not create a looped redirect by redirecting already HD images to itself
	if (!loc.includes('_raw') && !loc.includes('_1280')) {
		// If the URL is HTTP, change it to HTTPS
		if (!loc.startsWith('https://')) {
			loc = loc.replace(/^http/, 'https');
		}
		
		checkSize = function(i) {
			// Define which patterns to check
			var i = i || 0;
			var imageSizes = ['raw', '1280'];
			if (i > imageSizes) return;
			
			// Create the HD image url pattern
			var newLoc = loc;
			if (imageSizes[i] == 'raw') {
				newLoc = newLoc.replace(/[^/]*media.tumblr.com/, 'media.tumblr.com');
				newLoc = newLoc.replace(/[^_]*$/, imageSizes[i] + '.' + imageType[0]);
			} else {
				newLoc = newLoc.replace(/[^_]*$/, imageSizes[i] + '.' + imageType[0]);
			}
			
			// Check that the HD image exists, then redirect to it
			GM_xmlhttpRequest({
				url: newLoc,
				method: 'HEAD',
				onload: function(response) {
					if (response.status != '200') {
						checkSize(i+1);
						return;
					}
					window.location = newLoc;
				}
			});
		};
		checkSize();
	}
}