YouTube Chat Filter

Filters messages in YouTube stream chat.
当前为 2022-08-13 提交的版本，查看最新版本。
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// ==UserScript==
// @name        YouTube Chat Filter
// @version     1.0
// @description Filters messages in YouTube stream chat.
// @author      Callum Latham
// @namespace   https://greasyfork.org/users/696211-ctl2
// @license     MIT
// @match       *://www.youtube.com/*
// @match       *://youtube.com/*
// @require     https://greasyfork.org/scripts/446506-config/code/$Config.js?version=1081062
// @require     https://greasyfork.org/scripts/449472-boolean/code/$Boolean.js?version=1081058
// @grant       GM.setValue
// @grant       GM.getValue
// @grant       GM.deleteValue
// ==/UserScript==
 
// Don't run outside the chat frame
if (window.frameElement.id !== 'chatframe') {
    // noinspection JSAnnotator
    return;
}
 
window.addEventListener('load', async () => {
    // STATIC CONSTS
 
    const LONG_PRESS_TIME = 400;
    const ACTIVE_COLOUR = 'var(--yt-spec-call-to-action)';
    const CHAT_LIST_SELECTOR = '#items.yt-live-chat-item-list-renderer';
    const FILTER_CLASS = 'cf';
    const TITLE = 'YouTube Chat Filter';
    const PRIORITIES = {
        'VERIFIED': 'Verification Badge',
        'MODERATOR': 'Moderator Badge',
        'MEMBER': 'Membership Badge',
        'LONG': 'Long',
        'RECENT': 'Recent',
        'SUPERCHAT': 'Superchat',
        'MEMBERSHIP_RENEWAL': 'Membership Renewal',
        'MEMBERSHIP_GIFT_OUT': 'Membership Gift (Given)',
        'MEMBERSHIP_GIFT_IN': 'Membership Gift (Received)',
        'EMOJI': 'Emojis'
    };
 
    // ELEMENT CONSTS
 
    const STREAMER = window.parent.document.querySelector('#channel-name').innerText;
    const ROOT_ELEMENT = document.body.querySelector('#chat');
    const [BUTTON, SVG, COUNTER] = await (async () => {
        const SVG_NAMESPACE = 'http://www.w3.org/2000/svg';
 
        const [button, svgContainer, svg] = await new Promise((resolve) => {
            const template = document.body.querySelector('#overflow');
            const button = template.cloneNode(true);
            const svgContainer = button.querySelector('yt-icon');
 
            button.style.visibility = 'hidden';
 
            template.parentElement.insertBefore(button, template);
 
            window.setTimeout(() => {
                const path = document.createElementNS(SVG_NAMESPACE, 'path');
 
                path.setAttribute('d', 'M128.25,175.6c1.7,1.8,2.7,4.1,2.7,6.6v139.7l60-51.3v-88.4c0-2.5,1-4.8,2.7-6.6L295.15,65H26.75L128.25,175.6z');
 
                const rectangle = document.createElementNS(SVG_NAMESPACE, 'rect');
 
                rectangle.setAttribute('x', '13.95');
                rectangle.setAttribute('y', '0');
                rectangle.setAttribute('width', '294');
                rectangle.setAttribute('height', '45');
 
                const svg = document.createElementNS(SVG_NAMESPACE, 'svg');
 
                svg.setAttribute('viewBox', '-50 -50 400 400');
                svg.setAttribute('x', '0');
                svg.setAttribute('y', '0');
                svg.setAttribute('focusable', 'false');
 
                svg.append(path, rectangle);
 
                svgContainer.innerHTML = '';
                svgContainer.append(svg);
 
                button.style.removeProperty('visibility');
 
                resolve([button, svgContainer, svg]);
            }, 0);
        });
 
        const counter = (() => {
            const container = document.createElement('div');
 
            container.style.position = 'absolute';
            container.style.left = '9px';
            container.style.bottom = '9px';
            container.style.fontSize = '1.1em';
            container.style.lineHeight = 'normal';
            container.style.width = '1.6em';
            container.style.display = 'flex';
            container.style.alignItems = 'center';
 
            const svg = (() => {
                const circle = document.createElementNS(SVG_NAMESPACE, 'circle');
 
                circle.setAttribute('r', '50');
                circle.style.color = 'var(--yt-live-chat-header-background-color)';
                circle.style.opacity = '0.65';
 
                const svg = document.createElementNS(SVG_NAMESPACE, 'svg');
 
                svg.setAttribute('viewBox', '-70 -70 140 140');
 
                svg.append(circle);
 
                return svg;
            })();
 
            const text = document.createElement('span');
 
            text.style.position = 'absolute';
            text.style.width = '100%';
            text.innerText = '?';
 
            container.append(text, svg);
 
            svgContainer.append(container);
 
            return text;
        })();
 
        return [button, svg, counter];
    })();
 
    // STATE INTERFACES
 
    const $active = new $Boolean('YTCF_IS_ACTIVE');
 
    const $config = new $Config(
        'YTCF_TREE',
        (() => {
            const regexPredicate = (value) => {
                try {
                    RegExp(value);
                } catch (_) {
                    return 'Value must be a valid regular expression.';
                }
 
                return true;
            };
 
            return {
                'children': [
                    {
                        'label': 'Filters',
                        'children': [],
                        'seed': {
                            'label': 'Description',
                            'value': '',
                            'children': [
                                {
                                    'label': 'Streamer Regex',
                                    'children': [],
                                    'seed': {
                                        'value': '^',
                                        'predicate': regexPredicate
                                    }
                                },
                                {
                                    'label': 'Author Regex',
                                    'children': [],
                                    'seed': {
                                        'value': '^',
                                        'predicate': regexPredicate
                                    }
                                },
                                {
                                    'label': 'Message Regex',
                                    'children': [],
                                    'seed': {
                                        'value': '^',
                                        'predicate': regexPredicate
                                    }
                                }
                            ]
                        }
                    },
                    {
                        'label': 'Options',
                        'children': [
                            {
                                'label': 'Case-Sensitive Regex?',
                                'value': false
                            },
                            {
                                'label': 'Show Intro Message?',
                                'value': false
                            },
                            {
                                'label': 'Pause on Mouse Over?',
                                'value': false
                            },
                            {
                                'label': 'Queue Time (ms)',
                                'value': 1000,
                                'predicate': (value) => value >= 0 ? true : 'Queue time must be positive'
                            }
                        ]
                    },
                    {
                        'label': 'Preferences',
                        'children': [
                            {
                                'label': 'Requirements',
                                'children': [
                                    {
                                        'label': 'OR',
                                        'children': [],
                                        'poolId': 0
                                    },
                                    {
                                        'label': 'AND',
                                        'children': [],
                                        'poolId': 0
                                    }
                                ]
                            },
                            {
                                'label': 'Priorities (High to Low)',
                                'poolId': 0,
                                'children': Object.values(PRIORITIES).map(label => ({
                                    label,
                                    'value': label !== PRIORITIES.EMOJI && label !== PRIORITIES.MEMBERSHIP_GIFT_IN
                                }))
                            }
                        ]
                    }
                ]
            };
        })(),
        (() => {
            const EVALUATORS = (() => {
                const getEvaluator = (evaluator, isDesired) => isDesired ? evaluator : (_) => 1 - evaluator(_);
 
                return {
                    [PRIORITIES.RECENT]: getEvaluator.bind(null, () => 1),
                    [PRIORITIES.LONG]: getEvaluator.bind(null, _ => _.querySelector('#message').textContent.length),
                    [PRIORITIES.SUPERCHAT]: getEvaluator.bind(null, _ => _.matches('yt-live-chat-paid-message-renderer')),
                    [PRIORITIES.MEMBERSHIP_RENEWAL]: getEvaluator.bind(null, _ => _.matches('yt-live-chat-membership-item-renderer')),
                    [PRIORITIES.MEMBERSHIP_GIFT_OUT]: getEvaluator.bind(null, _ => _.matches('ytd-sponsorships-live-chat-gift-purchase-announcement-renderer')),
                    [PRIORITIES.MEMBERSHIP_GIFT_IN]: getEvaluator.bind(null, _ => _.matches('ytd-sponsorships-live-chat-gift-redemption-announcement-renderer')),
                    [PRIORITIES.EMOJI]: getEvaluator.bind(null, _ => Boolean(_.querySelector('.emoji'))),
                    [PRIORITIES.MEMBER]: getEvaluator.bind(null, _ => Boolean(_.querySelector('#chat-badges > [type=member]'))),
                    [PRIORITIES.MODERATOR]: getEvaluator.bind(null, _ => Boolean(_.querySelector('#chip-badges > [type=verified]'))),
                    [PRIORITIES.VERIFIED]: getEvaluator.bind(null, _ => Boolean(_.querySelector('#chat-badges > [type=moderator]')))
                };
            })();
 
            return ([rawFilters, options, {'children': [{'children': [softRequirements, hardRequirements]}, priorities]}]) => ({
                'filters': (() => {
                    const filters = [];
 
                    const getRegex = options.children[0].value ?
                        ({value}) => new RegExp(value) :
                        ({value}) => new RegExp(value, 'i');
                    const matchesStreamer = (node) => getRegex(node).test(STREAMER);
 
                    for (const filter of rawFilters.children) {
                        const [{'children': streamers}, {'children': authors}, {'children': messages}] = filter.children;
 
                        if (streamers.length === 0 || streamers.some(matchesStreamer)) {
                            filters.push({
                                'authors': authors.map(getRegex),
                                'messages': messages.map(getRegex)
                            });
                        }
                    }
 
                    return filters;
                })(),
                'showIntroMessage': options.children[1].value,
                'pauseOnHover': options.children[2].value,
                'queueTime': options.children[3].value,
                'requirements': {
                    'soft': softRequirements.children.map(({
                        label, 'value': isDesired
                    }) => EVALUATORS[label](isDesired)),
                    'hard': hardRequirements.children.map(({
                        label, 'value': isDesired
                    }) => EVALUATORS[label](isDesired))
                },
                'comparitors': (() => {
                    const getComparitor = (getValue, low, high) => {
                        low = getValue(low);
                        high = getValue(high);
 
                        return low < high ? -1 : low === high ? 0 : 1;
                    };
 
                    return priorities.children.map(({
                        label, 'value': isDesired
                    }) => getComparitor.bind(null, EVALUATORS[label](isDesired)));
                })()
            });
        })(),
        TITLE,
        {
            'headBase': '#ff0000',
            'headButtonExit': '#000000',
            'borderHead': '#ffffff',
            'nodeBase': ['#222222', '#111111'],
            'borderTooltip': '#570000'
        },
        {'zIndex': 10000}
    );
 
    // CSS
 
    (function style() {
        function addStyle(sheet, selector, rules) {
            const ruleString = rules.map(
                ([selector, rule]) => `${selector}:${typeof rule === 'function' ? rule() : rule} !important;`
            );
 
            sheet.insertRule(`${selector}{${ruleString.join('')}}`);
        }
 
        const styleElement = document.createElement('style');
        const {sheet} = document.head.appendChild(styleElement);
 
        const styles = [
            [`${CHAT_LIST_SELECTOR}`, [
                ['bottom', 'inherit']
            ]],
            [`${CHAT_LIST_SELECTOR} > :not(.${FILTER_CLASS})`, [
                ['display', 'none']
            ]]
        ];
 
        for (const style of styles) {
            addStyle(sheet, style[0], style[1]);
        }
    })();
 
    // STATE
 
    let queuedPost;
 
    // FILTERING
 
    function doFilter() {
        const chatListElement = ROOT_ELEMENT.querySelector(CHAT_LIST_SELECTOR);
 
        let doQueue = false;
        let paused = false;
 
        function showPost(post) {
            const config = $config.get();
 
            post.classList.add(FILTER_CLASS);
 
            queuedPost = undefined;
 
            if (config && config.queueTime > 0) {
                // Start queueing
                doQueue = true;
 
                window.setTimeout(() => {
                    doQueue = false;
 
                    // Unqueue
                    if (!paused) {
                        acceptPost();
                    }
                }, config.queueTime);
            }
        }
 
        function acceptPost(post = queuedPost) {
            /** Unqueue iff:
             * - Nothing was queued at the most recent unqueue
             * - No posts have been shown since the last unqueue
             * - A post is queued
             */
            if (!post) {
                return;
            }
 
            if (doQueue || paused) {
                queuedPost = post;
            } else {
                showPost(post);
            }
        }
 
        window.document.body.addEventListener('mouseenter', () => {
            const config = $config.get();
 
            if (config && config.pauseOnHover) {
                paused = true;
            }
        });
 
        window.document.body.addEventListener('mouseleave', () => {
            const config = $config.get();
 
            paused = false;
 
            if (config && config.pauseOnHover) {
                acceptPost();
            }
        });
 
        function processPost(post) {
            const config = $config.get();
 
            // Test insta-accept
            if (
                (!config || !$active.get()) ||
                (config.showIntroMessage && post.matches('yt-live-chat-viewer-engagement-message-renderer')) ||
                post.matches('yt-live-chat-placeholder-item-renderer')
            ) {
                showPost(post);
 
                return;
            }
 
            // Test reject
            if (
                config.filters.some(filter =>
                    // Test author filter
                    (filter.authors.length > 0 && filter.authors.some(_ => _.test(post.querySelector('#author-name')?.textContent))) ||
                    // Test message filter
                    (filter.messages.length > 0 && filter.messages.some(_ => _.test(post.querySelector('#message')?.textContent)))
                ) ||
                // Test requirements
                (config.requirements.soft.length > 0 && !config.requirements.soft.some(passes => passes(post))) ||
                config.requirements.hard.some(passes => !passes(post))
            ) {
                return;
            }
 
            // Test inferior to queued post
            if (queuedPost) {
                for (const comparitor of config.comparitors) {
                    const rating = comparitor(post, queuedPost);
 
                    if (rating < 0) {
                        return;
                    }
 
                    if (rating > 0) {
                        break;
                    }
                }
            }
 
            acceptPost(post);
        }
 
        // Handle new posts
        new MutationObserver((mutations) => {
            for (const {addedNodes} of mutations) {
                addedNodes.forEach(processPost);
            }
        }).observe(
            chatListElement,
            {childList: true}
        );
    }
 
    // BUTTON LISTENERS
 
    (() => {
        let timeout;
 
        const updateSvg = () => {
            SVG.style[`${$active.get() ? 'set' : 'remove'}Property`]('color', ACTIVE_COLOUR);
        };
 
        const updateCounter = () => {
            const config = $config.get();
            const count = config ? config.filters.length : 0;
 
            queuedPost = undefined;
 
            COUNTER.style[`${count > 0 ? 'set' : 'remove'}Property`]('color', ACTIVE_COLOUR);
 
            COUNTER.innerText = `${count}`;
        };
 
        const onShortClick = (event) => {
            if (timeout && event.button === 0) {
                timeout = window.clearTimeout(timeout);
 
                $active.toggle();
 
                updateSvg();
            }
        };
 
        const onLongClick = () => {
            timeout = undefined;
 
            $config.edit()
                .then(updateCounter)
                .catch(({message}) => {
                    if (window.confirm(`${message}\n\nWould you like to erase your data?`)) {
                        $config.reset();
 
                        updateCounter();
                    }
                });
        };
 
        Promise.allSettled([
            $active.init()
                .then(updateSvg),
            $config.init()
                .then(updateCounter)
        ])
            .then((responses) => {
                for (const response of responses) {
                    if ('reason' in response) {
                        window.alert(response.reason.message);
                    }
                }
 
                BUTTON.addEventListener('mouseup', onShortClick);
 
                BUTTON.addEventListener('mousedown', (event) => {
                    if (event.button === 0) {
                        timeout = window.setTimeout(onLongClick, LONG_PRESS_TIME);
                    }
                });
            });
    })();
 
    doFilter();
 
    // Restart if the chat element gets replaced
    // This happens when switching between 'Top Chat Replay' and 'Live Chat Replay'
    new MutationObserver((mutations) => {
        for (const {addedNodes} of mutations) {
            for (const node of addedNodes) {
                if (node.matches('yt-live-chat-item-list-renderer')) {
                    doFilter();
                }
            }
        }
    }).observe(
        ROOT_ELEMENT.querySelector('#item-list'),
        {childList: true}
    );
});