Retrieve all LinkedIn profiles of people leaving a comment

linkedin_profiles.js

/*====================================================================================================================
 * Author: Guillaume GARCIA (https://www.linkedin.com/in/guillaumegarcia/)
 * Date  : 30-november-2020
 *
 * Usage
 * -----
 *
 * Go to a LinkedIn post URL 
 *   such as: https://www.linkedin.com/feed/update/urn:li:activity:6738104526265446400/
 * Open Chrome DevTools
 * Run this snippet
 * Wait for it to complete (notification OR js alert)
 * Paste to Excel all LinkedIn URL profiles
 *====================================================================================================================*/

// Constants
const wait = 1500;  // increase this in case you are dealing with post with VERY large volume of comments
const LINKEDIN_ICON = 'https://static-exp1.licdn.com/scds/common/u/images/logos/favicons/v1/favicon.ico';

// Helpers
const promiseSerializer = function(tasks) {
    return tasks.reduce((promiseChain, currentTask) => {
        return promiseChain.then(chainResults => currentTask().then(currentResult => [...chainResults, currentResult]))
    }, Promise.resolve([]));
};

const CHROME_TOOLS = {
    copy: copy    // copy is a Command Line not accessible within a new Promise(...) or setTimeout(...)
};
const RESOLVE = {
    more    : null,
    previous: null,
};

//--------------------------------------------------
// Main logic
//--------------------------------------------------

let tasks = [
	// Disable image loading (to save bandwith and CPU)
	() => (function() {
		let node = document.createElement('style');
		node.setAttribute('id', 'show-no-image-trick');
		node.appendChild(document.createTextNode(`img { display: none !important; }`));
		document.head.appendChild(node);

		return Promise.resolve(true);
	})(),

	// Load more comments
	() => (function showMore() {
        if (!RESOLVE.more) {
            return new Promise((resolve) => {
                RESOLVE.more = resolve;
                showMore();
            });
        }
        
        let button = document.querySelector('.comments-comments-list__load-more-comments-button');
        if (!button) { 
            console.log('*** Finished loading more comments')
            return RESOLVE.more(true); 
        }

        button.click && button.click();
        
        // wait for new comments to load
        setTimeout(showMore, wait || 1000);
	})(),

	// Load previous comments (within a thread)
	() => (function showPrevious() {
        if (!RESOLVE.previous) {
            return new Promise((resolve) => {
                RESOLVE.previous = resolve;
                showPrevious();
            });
        }
        
        let button = document.querySelector('.button.show-prev-replies');
        if (!button) { 
            console.log('*** Finished loading previous comments')
            return RESOLVE.previous(true); 
        }

        button.click && button.click();
        
        // wait for previous comments to load
        setTimeout(showPrevious, wait || 1000);
	})(),

	// Retrieve LinkedIn profile URL from post & replies
	() => new Promise(function(resolve) {
		let comments = [...document.querySelectorAll(".comments-comment-item__post-meta"),
		                ...document.querySelectorAll(".comments-reply-item__post-meta")];

        let profiles = Array.from(new Set(comments.map(cmt => cmt.lastElementChild.href)));
        let csv      = profiles.join('\n');

		// copy complete csv string to clipboard
        CHROME_TOOLS.copy(csv);

		// signal user that process is complete
		let message = 'You can now paste ' + profiles.length + ' entries in Excel, Google Sheets, ...';

		if (window.Notification && Notification.permission !== 'denied') {
			Notification.requestPermission(function(status) {  // status is "granted", if accepted by user
				var n = new Notification('Job completed', { 
					body: message,
					icon: LINKEDIN_ICON
				}); 
			});
		} else {
			alert(message);
        }
        
        return resolve(profiles.length);
	})
];

promiseSerializer(tasks)
    .then(values => { console.log(values); })
    .finally(() => {
		// show back images
        let node = document.querySelector('style#show-no-image-trick');
        if (!node) { return; }
        node.remove();    
    });