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User script to resolve t.co links on twitter
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| // ==UserScript== | |
| // @name Resolve t.co links on twitter | |
| // @namespace Violentmonkey Scripts | |
| // @match *://twitter.com/* | |
| // @grant GM_xmlhttpRequest | |
| // @version 1.1 | |
| // @author @jix_ | |
| // @homepage https://gist.github.com/jix/e67c127820954e1d1571c1f6f800ac2c | |
| // @description Tries to resolve all annoying t.co links on twitter and replaces them with the | |
| // target URL. | |
| // ==/UserScript== | |
| // 2021-02-23: 1.1: Also handle http not only https. Handle initial DOM nodes. Slightly improved | |
| // error handling/logging. | |
| // 2021-02-17: 1.0: Initial version | |
| const inFlight = {}; // Have just one request in flight per URL | |
| const cached = {}; // Cache results until page reload | |
| // Takes a 't.co' url, strips '?amp=1' if present and resolves it by making a GET request. With curl | |
| // on the command line you can also use a HEAD request, but I didn't manage to make it work in here. | |
| const resolveTcoUrl = function (url, callback) { | |
| url = url.replace('?amp=1', ''); | |
| if (cached.hasOwnProperty(url)) { | |
| callback(cached[url]); | |
| return; | |
| } | |
| console.log(`resolving ${url}`); | |
| if (inFlight.hasOwnProperty(url)) { | |
| // Request already in flight, just push this callback to it | |
| inFlight[url].push(callback); | |
| return; | |
| } else { | |
| inFlight[url] = [callback]; | |
| } | |
| GM_xmlhttpRequest({ | |
| method: "GET", | |
| url: url, | |
| anonymous: true, | |
| onload: function (response) { | |
| if (response.status != 200) { | |
| console.log(`failed resolve for ${url}`); | |
| // We reset the callbacks so if the url appears again we can retry... untested though | |
| delete inFlight[url]; | |
| return; | |
| } | |
| let target; | |
| try { | |
| // The resulting url is in a meta http eqiv tag, easy to parse with browser APIs | |
| const parsed = new DOMParser().parseFromString(response.responseText, 'text/html'); | |
| const meta = parsed.querySelector('META[http-equiv="refresh"]'); | |
| target = meta.content.replace(/^0;URL=/, ''); | |
| cached[url] = target; // Cache until page reload | |
| } catch (e) { | |
| console.log([`parsing response for ${url} failed`, e]); | |
| delete inFlight[url]; | |
| return; | |
| } | |
| const callbacks = inFlight[url]; // Get and reset all pending callbacks | |
| delete inFlight[url]; | |
| for (const callback of callbacks) { | |
| try { | |
| callback(target); // And notify them | |
| } catch (e) { | |
| console.log([`callback after resolving ${url} failed`, e]); | |
| } | |
| } | |
| } | |
| }); | |
| }; | |
| // Resolve all <a href=...> contained in the passed DOM node | |
| const replaceContainedLinks = function (subtree) { | |
| for (const linkNode of subtree.querySelectorAll('a')) { | |
| if (!linkNode.href.startsWith('https://t.co/') && !linkNode.href.startsWith('http://t.co/')) continue; | |
| resolveTcoUrl(linkNode.href, function (resolved) { | |
| linkNode.href = resolved; | |
| }); | |
| } | |
| } | |
| // This gets called whenever twitter javascript adds new subtrees to the DOM which we'll scan for | |
| // links. | |
| const mutationCallback = function (mutationsList, observer) { | |
| // We scan all added subtrees for all <a> tags and check whether we need to rsolve them | |
| for (const mutation of mutationsList) { | |
| for (const addedSubtree of mutation.addedNodes) { | |
| replaceContainedLinks(addedSubtree) | |
| } | |
| } | |
| }; | |
| // Install the mutation callback | |
| new MutationObserver(mutationCallback).observe(document, { childList: true, subtree: true }); | |
| // Replace links in static content | |
| replaceContainedLinks(document); |
This code does not run in the console but requires an extension like Violentmonkey. I also stopped using Twitter so I'm not using or maintaining this script anymore.
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I tried to run this code in the Firefox console today and it returned this page as an explanation for the error I received. I couldn't see where the let command in your code would interfere with anything. Do you have any insights?