osu-web

Library to modify static and dynamic components of osu web pages
Ekde 2023/08/27. Vidu La ĝisdata versio.
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/473977/1241438/osu-web.js
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// ==UserScript==
// @name         osu-web
// @namespace    osu
// @version      1.0.5
// @description  Library to modify static and dynamic components of osu web pages
// @author       Magnus Cosmos
// ==/UserScript==

// Utils
function isNonEmptyObj(obj) {
    if (obj === null || (typeof obj !== "function" && typeof obj !== "object")) {
        return false;
    }
    for (const _key in obj) {
        return true;
    }
    return false;
}

// Classes
class webpack {
    constructor() {
        if (this.constructor == webpack) {
            throw new Error("webpack class cannot be instantiated.");
        }
        this.loaded = false;
        this.modules = {};
    }

    inject(entryPoint, data) {
        try {
            if (unsafeWindow) {
                unsafeWindow[entryPoint].push(data);
            } else {
                window[entryPoint].push(data);
            }
        } catch (err) {
            throw new Error(`Injection failed: ${err.message}`);
        }
    }
}

// Based on `Webpack-module-crack` and `moduleRaid`
class Webpack extends webpack {
    constructor(options) {
        super();
        if (this.loaded) {
            return;
        }
        let { moduleId, chunkId, entryPoint } = options || {};
        moduleId = moduleId || Math.random().toString(36).substring(2, 6);
        chunkId = chunkId || Math.floor(101 + Math.random() * 899);
        entryPoint = entryPoint || "webpackJsonp";
        const data = [
            [chunkId],
            {
                [moduleId]: (_module, _exports, require) => {
                    const installedModules = require.c;
                    for (const id in installedModules) {
                        const exports = installedModules[id].exports;
                        if (isNonEmptyObj(exports)) {
                            this.modules[id] = exports;
                        }
                    }
                },
            },
            [[moduleId]],
        ];
        this.inject(entryPoint, data);
        this.loaded = true;
    }
}

function loaded(selector, parent, callback, options = { childList: true }) {
    const el = parent.querySelector(selector);
    if (el) {
        callback(el);
    } else {
        new MutationObserver(function (_mutations, observer) {
            const el = parent.querySelector(selector);
            if (el) {
                callback(el);
                observer = observer ? observer : this;
                observer.disconnect();
            }
        }).observe(parent, options);
    }
}

class Module {
    constructor() {
        if (this.constructor == Module) {
            throw new Error("Module class cannot be instantiated.");
        }
        this.loaded = false;
        this.static = [];
        this.dynamic = [];
        this.before = {};
        this.after = {};
        this.keys = [];
        this.style = null;
    }

    init() {
        this.webpack = new Webpack();
        this.#getTurboLinks();
        this.#getReactModules();
    }

    #getTurboLinks() {
        for (const id in this.webpack.modules) {
            const exports = this.webpack.modules[id];
            if ("controller" in exports) {
                this.turbolinks = exports;
                return;
            }
        }
    }

    #getReactModules() {
        const reactModules = new Set();
        for (const id in this.webpack.modules) {
            const exports = this.webpack.modules[id];
            if ("__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED" in exports) {
                reactModules.add(exports);
            }
        }
        [this.React, this.ReactDOM] = reactModules;
    }

    modifyFn(obj, fn, key, _before, _after) {
        if (!(key in this.keys)) {
            this.keys.push(key);
            this.before[key] = [];
            this.after[key] = [];
            this.#modify(obj, fn, key);
        }
        if (_before) {
            this.before[key].push(_before);
        }
        if (_after) {
            this.after[key].push(_after);
        }
    }

    #modify(obj, fn, key) {
        const self = this;
        const oldFn = obj[fn];
        obj[fn] = function () {
            self.#beforeFn(key, arguments);
            const r = oldFn.apply(this, arguments);
            self.#afterFn(key, arguments, r);
            return r;
        };
    }

    #beforeFn(key, args) {
        const arr = this.before[key] || [];
        for (const fn of arr) {
            fn(args);
        }
    }

    #afterFn(key, args, r) {
        const arr = this.after[key] || [];
        for (const fn of arr) {
            fn(args, r);
        }
    }
}

class OsuWeb extends Module {
    constructor(staticFn, dynamicFn) {
        super();
        this.static = staticFn || (() => {});
        this.dynamic = dynamicFn || (() => {});
        loaded("html", document, (html) => {
            loaded("head", html, () => {
                if (!this.style) {
                    this.style = document.createElement("style");
                    this.style.id = "osu-web";
                    document.head.append(this.style);
                }
            });
            loaded("body", html, () => {
                this.init();
                this.start();
            });
        });
    }

    start() {
        this.static(document.body);
        const controller = this.turbolinks.controller;
        this.modifyFn(controller, "render", "turbolinks.render", null, (args, r) => {
            this.static(r.newBody);
        });
        this.dynamic();
    }

    addStyle(css) {
        this.style.innerHTML += `\n${css}`;
    }
}