Restore YouTube Username from Handle to Custom

To restore YouTube Username to the traditional custom name
当前为 2023-06-16 提交的版本，查看最新版本。
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/*
 
MIT License
 
Copyright 2023 CY Fung
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
// ==UserScript==
// @name                Restore YouTube Username from Handle to Custom
// @namespace           http://tampermonkey.net/
// @version             0.3.0
// @license             MIT License
// @description         To restore YouTube Username to the traditional custom name
// @description:ja      YouTubeのユーザー名を伝統的なカスタム名に復元するために。
 
// @author              CY Fung
// @match               https://www.youtube.com/*
// @exclude             /^https?://\S+\.(txt|png|jpg|jpeg|gif|xml|svg|manifest|log|ini)[^\/]*$/
// @icon                https://github.com/cyfung1031/userscript-supports/raw/main/icons/general-icon.png
// @supportURL          https://github.com/cyfung1031/userscript-supports
// @run-at              document-start
// @grant               none
// @unwrap
// @allFrames
// @inject-into page
// ==/UserScript==
 
/* jshint esversion:8 */
 
(function () {
    'use strict';
 
    const cfg = {};
    class Mutex {
 
        constructor() {
            this.p = Promise.resolve()
        }
 
        lockWith(f) {
            this.p = this.p.then(() => new Promise(f)).catch(console.warn)
        }
 
    }
    const mutex = new Mutex();
 
    const displayNameCacheStore = new Map();
 
    const promisesStore = {};
 
    function createNetworkPromise(channelId) {
 
        return new Promise(networkResolve => {
 
 
            mutex.lockWith(lockResolve => {
 
                if (!document.querySelector(`[jkrgy="${channelId}"]`)) {
                    // element has already been removed
                    lockResolve(null);
                }
 
                //INNERTUBE_API_KEY = ytcfg.data_.INNERTUBE_API_KEY
 
 
                fetch(new window.Request(`/youtubei/v1/browse?key=${cfg.INNERTUBE_API_KEY}&prettyPrint=false`, {
                    "method": "POST",
                    "mode": "same-origin",
                    "credentials": "same-origin",
 
                    // (-- reference: https://javascript.info/fetch-api
                    referrerPolicy: "no-referrer",
                    cache: "default",
                    redirect: "error",
                    integrity: "",
                    keepalive: false,
                    signal: undefined,
                    window: window,
                    // --)
 
                    "headers": {
                        "Content-Type": "application/json",
                        "Accept-Encoding": "gzip, deflate, br"
                    },
                    "body": JSON.stringify({
                        "context": {
                            "client": {
                                "clientName": "MWEB",
                                "clientVersion": `${cfg.INNERTUBE_CLIENT_VERSION || '2.20230614.01.00'}`,
                                "originalUrl": `https://m.youtube.com/channel/${channelId}`,
                                "playerType": "UNIPLAYER",
                                "platform": "MOBILE",
                                "clientFormFactor": "SMALL_FORM_FACTOR",
                                "acceptHeader": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
                                "mainAppWebInfo": {
                                    "graftUrl": `/channel/${channelId}`,
                                    "webDisplayMode": "WEB_DISPLAY_MODE_BROWSER",
                                    "isWebNativeShareAvailable": true
                                }
                            },
                            "user": {
                                "lockedSafetyMode": false
                            },
                            "request": {
                                "useSsl": true,
                                "internalExperimentFlags": [],
                                "consistencyTokenJars": []
                            }
                        },
                        "browseId": `${channelId}`
                    })
                })).then(res => {
                    lockResolve();
                    return res.json();
                }).then(res => {
                    networkResolve(res);
                }).catch(e => {
                    lockResolve();
                    console.warn(e);
                    networkResolve(null);
                })
 
 
 
            });
 
        })
 
    }
 
    const queueMicrotask_ = typeof queueMicrotask === 'function' ? queueMicrotask : requestAnimationFrame;
 
    function getDisplayName(channelId) {
 
        return new Promise(resolve => {
 
            let cachedResult = displayNameCacheStore.get(channelId);
            if (cachedResult) {
                resolve(cachedResult);
                return;
            }
 
            if (!promisesStore[channelId]) promisesStore[channelId] = createNetworkPromise(channelId);
 
            promisesStore[channelId].then(res => {
                // res might be null
 
                queueMicrotask_(() => {
                    promisesStore[channelId] = null;
                    delete promisesStore[channelId];
                });
 
                let resultInfo = ((res || 0).metadata || 0).channelMetadataRenderer;
 
                if (!resultInfo) {
                    resolve(null);
                } else {
 
                    const { title, externalId, ownerUrls, channelUrl, vanityChannelUrl } = res.metadata.channelMetadataRenderer;
 
                    const displayNameRes = { title, externalId, ownerUrls, channelUrl, vanityChannelUrl };
                    displayNameCacheStore.set(channelId, displayNameRes);
 
                    resolve(displayNameRes);
 
                }
 
 
            }).catch(console.warn);
 
        }).catch(console.warn);
    }
 
    const dataChangedFuncStore = new WeakMap();
 
    const obtainChannelId = (href) => {
        let m = /\/channel\/([^/?#\s]+)/.exec(`/${href}`);
        return !m ? '' : (m[1] || '');
    }
 
    const dataChangeFuncProducer = (dataChanged) => {
 
        return function () {
            let anchor = null;
            try {
                anchor = HTMLElement.prototype.querySelector.call(this, 'a[id][href*="channel/"][jkrgy]');
            } catch (e) { }
            if (anchor !== null && (this.data || 0).jkrgx !== 1) {
                anchor.removeAttribute('jkrgy');
            }
            return dataChanged.apply(this, arguments)
        }
 
 
    }
 
    const anchorIntegrityCheck = (anchor, channelHref, channelId) => {
 
        // https://www.youtube.com/channel/UCRmLncxsQFcOOC8OhzUIfxQ/videos /channel/UCRmLncxsQFcOOC8OhzUIfxQ UCRmLncxsQFcOOC8OhzUIfxQ
 
 
        let currentHref = anchor.getAttribute('href');
        if (currentHref === channelHref) return true; // /channel/UCRmLncxsQFcOOC8OhzUIfxQ // /channel/UCRmLncxsQFcOOC8OhzUIfxQ
 
        return (currentHref + '/').indexOf(channelHref + '/') >= 0;
 
    }
 
    const verifyAndConvertHandle = (currentDisplayed, fetchResult) => {
 
        const { title, externalId, ownerUrls, channelUrl, vanityChannelUrl } = fetchResult;
 
        const currentDisplayTrimmed = currentDisplayed.trim();
        let match = false;
        if ((vanityChannelUrl || '').endsWith(`/${currentDisplayTrimmed}`)) {
            match = true;
        } else if ((ownerUrls || 0).length >= 1) {
            for (const ownerUrl of ownerUrls) {
                if ((ownerUrl || '').endsWith(`/${currentDisplayTrimmed}`)) {
                    match = true;
                    break;
                }
            }
        }
        if (match) {
            return currentDisplayTrimmed;
        }
        return '';
 
    }
 
    const isDisplayAsHandle = (text) => {
 
        if (typeof text !== 'string') return false;
        if (text.length < 4) return false;
        if (text.indexOf('@') < 0) return false;
        return /^\s*@[a-zA-Z0-9_\-.]{3,30}\s*$/.test(text);
 
 
        /* https://support.google.com/youtube/answer/11585688?hl=en&co=GENIE.Platform%3DAndroid
 
        Handle naming guidelines
 
        Is between 3-30 characters
        Is made up of alphanumeric characters (A–Z, a–z, 0–9)
        Your handle can also include: underscores (_), hyphens (-), dots (.)
        Is not URL-like or phone number-like
        Is not already being used
        Follows YouTube's Community Guidelines
 
        // auto handle - without dot (.)
 
        */
 
    }
 
    const contentTextProcess = (contentTexts, idx) => {
        const contentText = contentTexts[idx];
        const text = (contentText || 0).text;
        const url = (((contentText.navigationEndpoint || 0).commandMetadata || 0).webCommandMetadata || 0).url;
        if (typeof url === 'string' && typeof text === 'string') {
 
            if (!isDisplayAsHandle(text)) return null;
            const channelId = obtainChannelId(url);
 
            return getDisplayName(channelId).then(fetchResult => {
                let resolveResult = null;
                if (fetchResult) {
                    // note: if that user shown is not found in `a[id]`, the hyperlink would not change
 
                    const textTrimmed = verifyAndConvertHandle(text, fetchResult);
                    if (textTrimmed) {
                        resolveResult = (md) => {
                            let runs = ((md || 0).contentText || 0).runs;
                            if (!runs || !runs[idx]) return;
                            if (runs[idx].text !== text) return;
                            runs[idx].text = text.replace(textTrimmed, `@${fetchResult.title}`); // HyperLink always @SomeOne
                            md.contentText = Object.assign({}, md.contentText);
                        };
                    }
                }
                return (resolveResult); // function as a Promise
            });
        }
 
        return null;
    }
 
    const domCheck = async (anchor, channelHref, mt) => {
 
        try {
            if (!channelHref || !mt) return;
            let parentNode = anchor.parentNode;
            while (parentNode instanceof Node) {
                if (typeof parentNode.is === 'string' && typeof parentNode.dataChanged === 'function') break;
                parentNode = parentNode.parentNode
            }
            if (parentNode instanceof Node && typeof parentNode.is === 'string' && typeof parentNode.dataChanged === 'function') { } else return;
            const authorText = (parentNode.data || 0).authorText;
            const currentDisplayed = (authorText || 0).simpleText;
            if (typeof currentDisplayed !== 'string') return;
            if (!isDisplayAsHandle(currentDisplayed)) return;
 
            const oldDataChanged = parentNode.dataChanged;
            if (typeof oldDataChanged === 'function' && !oldDataChanged.jkrgx) {
                let newDataChanged = dataChangedFuncStore.get(oldDataChanged)
                if (!newDataChanged) {
                    newDataChanged = dataChangeFuncProducer(oldDataChanged);
                    newDataChanged.jkrgx = 1;
                    dataChangedFuncStore.set(oldDataChanged, newDataChanged);
                }
                parentNode.dataChanged = newDataChanged;
            }
 
            const fetchResult = await getDisplayName(mt);
 
            if (fetchResult === null) return;
 
            const { title, externalId, ownerUrls, channelUrl, vanityChannelUrl } = fetchResult;
 
            if (externalId !== mt) return; // channel id must be the same
 
            // anchor href might be changed by external
            if (!anchorIntegrityCheck(anchor, channelHref, externalId)) return;
 
            const parentNodeData = parentNode.data
            const funcPromises = [];
            if (parentNode.isAttached === true && parentNode.isConnected === true && typeof parentNodeData === 'object' && parentNodeData && parentNodeData.authorText === authorText) {
 
                if (authorText.simpleText !== currentDisplayed) return;
                const currentDisplayTrimmed = verifyAndConvertHandle(currentDisplayed, fetchResult);
                const cSimpleText = ((parentNodeData.authorText || 0).simpleText || '');
                if (currentDisplayTrimmed && currentDisplayed !== title && cSimpleText === currentDisplayed) {
 
                    // the inside hyperlinks will be only converted if its parent author name is handle
                    const contentTexts = (parentNodeData.contentText || 0).runs;
                    if (contentTexts && contentTexts.length >= 1) {
                        for (let aidx = 0; aidx < contentTexts.length; aidx++) {
                            const r = contentTextProcess(contentTexts, aidx);
                            if (r instanceof Promise) funcPromises.push(r);
                        }
                    }
 
                    const md = Object.assign({}, parentNodeData);
                    let setBadge = false;
                    if (((((md.authorCommentBadge || 0).authorCommentBadgeRenderer || 0).authorText || 0).simpleText || '').trim() === cSimpleText.trim()) {
                        setBadge = true;
                    }
                    // parentNode.data = Object.assign({}, { jkrgx: 1 });
                    md.authorText = Object.assign({}, md.authorText, { simpleText: currentDisplayed.replace(currentDisplayTrimmed, title) });
                    if (setBadge) {
                        md.authorCommentBadge = Object.assign({}, md.authorCommentBadge);
                        md.authorCommentBadge.authorCommentBadgeRenderer = Object.assign({}, md.authorCommentBadge.authorCommentBadgeRenderer);
                        md.authorCommentBadge.authorCommentBadgeRenderer.authorText = Object.assign({}, md.authorCommentBadge.authorCommentBadgeRenderer.authorText, { simpleText: title });
 
                    }
                    if (funcPromises.length >= 1) {
                        let funcs = await Promise.all(funcPromises);
 
                        for (const func of funcs) {
                            if (typeof func === 'function') {
                                func(md);
                            }
                        }
                    }
                    parentNode.data = Object.assign({}, md, { jkrgx: 1 });
                }
 
            }
        } catch (e) {
            console.warn(e);
        }
 
 
    }
 
    const domChecker = () => {
 
        const newAnchors = document.querySelectorAll('a[id][href*="channel/"]:not([jkrgy])');
        for (const anchor of newAnchors) {
            // author-text or name
            // normal url: /channel/xxxxxxx
            // Improve YouTube! - https://www.youtube.com/channel/xxxxxxx/videos
            const href = anchor.getAttribute('href');
            const channelId = obtainChannelId(href); // string, can be empty
            anchor.setAttribute('jkrgy', channelId);
            domCheck(anchor, href, channelId);
        }
 
    };
 
 
    /** @type {MutationObserver | null} */
    let domObserver = null;
 
    document.addEventListener('yt-page-data-fetched', function (evt) {
 
        const cfgData = (((window || 0).ytcfg || 0).data_ || 0);
        for (const key of ['INNERTUBE_API_KEY', 'INNERTUBE_CLIENT_VERSION']) {
            cfg[key] = cfgData[key];
        }
 
        if (!cfg['INNERTUBE_API_KEY']) {
            console.warn("Userscript Error: INNERTUBE_API_KEY is not found.");
            return;
        }
 
        if (!domObserver) {
            domObserver = new MutationObserver(domChecker);
        } else {
            domObserver.takeRecords();
            domObserver.disconnect();
        }
 
        domObserver.observe(evt.target || document.body, { childList: true, subtree: true });
        domChecker();
 
    });
 
 
})();