Auto-embed Twitter links.

Find Twitter links and embed them directly into a post.
当前为 2023-04-14 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Auto-embed Twitter links.
// @author       Joshh
// @namespace    https://tljoshh.com
// @version      0.2
// @description  Find Twitter links and embed them directly into a post.
// @match        *://*.websight.blue/thread/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=websight.blue
// @license MIT
// ==/UserScript==

(function() {
    'use strict';
    main();

    function main() {
        const postsContainer = document.querySelector('#messages');
        const posts = document.querySelectorAll('.post');

        // Look for twitter links
        for (const post of posts) {
            handlePost(post);
        };
        // Listen for twitter links in new posts added by livelinks
        startMutationObserver(postsContainer);
    }

    // Add event listener to any posts added to DOM via livelinks
    function startMutationObserver(targetNode) {
        // Options for the observer (which mutations to observe)
        const config = { childList: true };

        // Callback function to execute when mutations are observed
        const callback = (mutationList, observer) => {
            // For all mutations made to the target node, check if any nodes were added...
            for (const mutation of mutationList) {
                handleMutation(mutation);
            }
        };

        // Create an observer instance linked to the callback function
        const observer = new MutationObserver(callback);

        // Start observing the target node for configured mutations
        observer.observe(targetNode, config);
    }

    // Handle any changes made to the messages container.
    function handleMutation(mutation) {
        // For all nodes that were added, check if any where posts made by a user and add a click event listener.
        if(mutation.addedNodes.length) {
            for (const addedNode of mutation.addedNodes) {
                if (!addedNode.tagName) continue; // Not an element
                if(addedNode.classList.contains('post')) {
                    handlePost(addedNode);
                }
            }
        }
    }

    function handlePost(post) {
        const links = post.querySelectorAll('.message-contents a[href*="twitter.com"]');
        const twitterLinkRegex = new RegExp('http(s)?:\/\/(www\.)?(mobile\.)?twitter.com\/(.*)\/status\/(\\d+)(.*)?');
        const twitterLinks = [...links].filter(link => link.href.match(twitterLinkRegex) !== null);
        if(twitterLinks.length) {
            if(typeof twttr === 'undefined') {
                createTwitterScript();
            }
            twttr.ready((twttr) => {
                for (const link of twitterLinks) {
                    link.style.display = "none";
                    const matchGroups = link.href.match(twitterLinkRegex);
                    const tweetId = matchGroups[4];
                    const node = createEmbedNode(tweetId);
                    link.parentNode.insertBefore(node, link.nextSibling);
                    twttr.widgets.createTweet(tweetId, node);
                }
            });
        }
    }

    function createEmbedNode(tweetId) {
        const node = document.createElement('div');
        node.setAttribute('id', `tweet-${tweetId}`);
        return node;
    }

    function createTwitterScript() {
        const script = document.createElement('script');
        script.setAttribute('type', 'text/javascript');
        script.appendChild(document.createTextNode('window.twttr=function(t,e,r){var n,s=t.getElementsByTagName(e)[0],i=window.twttr||{};return t.getElementById(r)||((n=t.createElement(e)).id=r,n.src="https://platform.twitter.com/widgets.js",s.parentNode.insertBefore(n,s),i._e=[],i.ready=function(t){i._e.push(t)}),i}(document,"script","twitter-wjs");'));
        document.head.appendChild(script);
    }
})();
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