Anonymously visit certain users' Instagram stories

ig_anon.js

// ==UserScript==
// @name         Instagram story anonymous
// @namespace    http://jeffpalm.com/
// @version      0.1
// @description  Anonymously visit certain users' Instagram stories
// @author       Jeff Palm
// @match        https://www.instagram.com/*
// @grant        none
// ==/UserScript==

/*
Instructions:
 1. Copy a user id from here: https://commentpicker.com/instagram-user-id.php
 2. Add it to `blockList` below

Caveats:
 Doesn't work from the reel. So, you should mute any user to which you do this.
*/

(function() {
    'use strict';

    const blockList = [
        '26302987963', // stellabumbles
    ];

    // https://stackoverflow.com/questions/629671/how-can-i-intercept-xmlhttprequests-from-a-greasemonkey-script
    function replaceXMLHttpRequest() {
        XMLHttpRequest.prototype.realOpen = XMLHttpRequest.prototype.open;

        const myOpen = function(method, url, async, user, password) {
            //do whatever mucking around you want here, e.g.
            //changing the onload callback to your own version

            // Store the url so we can use it in send
            this.url = url;

            this.realOpen (method, url, async, user, password);
        }
        XMLHttpRequest.prototype.open = myOpen;

        XMLHttpRequest.prototype.realSend = XMLHttpRequest.prototype.send;

        const mySend = function(body) {
            const url = this.url;

            // TODO: I don't think this matters...
            const data = [];
            const skipped = [];
            if (url.match(/.*logging_client_events$/)) {
                const p = new URLSearchParams(body);
                const m = JSON.parse(p.get('message'));
                const data = m.data.map(o => {
                    if (o.name === 'instagram_web_media_impressions') {
                        const user = (o.obj_id || '').replace(/\//g, '');
                        if (blockList.includes(user)) {
                            console.log("skip", o);
                            return;
                        }
                    }
                    return o;
                }).filter(Boolean);
                m.data = data;
                p.set('message', JSON.stringify(m));
                body = p.toString();
            }

            if (url.match(/.*graphql$/)) {
                const p = new URLSearchParams(body);
                const vars = JSON.parse(p.get('variables') || '');
                if (vars && vars.reelMediaOwnerId && blockList.includes(vars.reelMediaOwnerId)) {
                    console.log("block", vars);
                    p.set('variables', '{}');
                    body = p.toString();
                }
            }

            this.realSend(body);
        };

        XMLHttpRequest.prototype.send = mySend ;

    }

    function main() {
        replaceXMLHttpRequest();
    }

    main();
})();